Abstract: A safety device against ruptures in gas pipes comprises a housing (11) with a cavity (12) and a plunger (13) movable to and fro in the cavity (12). The plunger (13) has parts (14, 15) in engagement with the wall of the cavity and two influencing surfaces (23, 24) of different sizes. The smaller influencing surface (23) communicates with a main pipe (25) from a gas source to a user. The larger influencing surface (24) communicates with a control pipe (28) from the main pipe (25) spaced from the device. The plunger (13) influences the gas flow in the main pipe (25) with its movement and/or indicates a pressure drop in the control pipe (28).

Abstract: A valve driving apparatus for actuating a shutoff valve or a dump valve provided in a pipeline for conveying a gaseous or liquid substance. The valve driving apparatus is constructed by disposing a gas/oil type booster and a hydraulic pump between a gas pipe which is branched from a primary side of the gas pipeline and a cylinder of an actuator and connecting them with a pipe thereby driving the actuator to close the shutoff valve or open the dump valve with the hydraulic pressure raised by the booster with the primary side pressure of the gas pipeline as the power source and meanwhile resetting the booster with a hydraulic pump disposed between the booster and the actuator thereby enabling the gas in the booster to return to the gas pipeline via the gas pipe.

Abstract: The present invention relates to an excess flow valve system having a sliding poppet within a chamber with an orifice at one end, wherein the closing flow rate settings can be adjusted. Precise adjustments can be made externally by turning a threaded member extending through the valve, which causes a retainer, threadably located on the member, to move laterally within the chamber. This movement causes an angled surface on the retainer to engage and slide in relation to a similarly angled surface on the poppet. As the poppet is urged toward the retainer by a coiled spring, the poppet is moved longitudinally within the chamber, either toward or away from the orifice. Turning the threaded member enables the maximum travel distance of the poppet, and therefore, the threshold flow rate of the valve, to be precisely set.

Abstract: A combination valve that provides both positive shut off and excessive flow shut off. A rotary valve is provided. In its first position an integral excessive flow shut off valve allows normal flow and shuts off if high flow occurs. In a second position the flow is shut off independent of the excessive flow valve. A third position is provided for purging a repaired or new system and for resetting the excessive flow shut off valve.

Abstract: A cooling circuit includes a valve device (1, 1', 1") for a separate heat exchanger (42), especially of an internal combustion engine (48). To achieve a combined pressure limitation and pipe or hose break valve, a valve body (6, 35, 50), upon reaching a coolant throughput for maximum heat transfer in heat exchangers (42) located downstream, is actuated as a function of delivery pressure into an engaged position with a valve seat (5, 51). A throttle passage (7, 36, 52) maintains a coolant throughput that corresponds to maximum heat transfer. In the event of a pipe or hose break, the valve body (6, 35, 50) serving as part of a pipe or hose break is locked in a closed position.

Abstract: An LP gas container valve to be mounted on a propane gas container is provided for preventing a fire, explosion or other accident at the time of a disaster. The LP gas container valve comprises a valve body having a valve outlet and a gas passage leading from an inlet connection to a propane gas container to the valve outlet, a closing valve (attached to the valve body) for opening and closing the gas passage, a safety valve (attached to the valve body) actuated in response to an excessive elevation in gas pressure, a branching point in the gas passage leading to the safety valve, and a ball located in the gas passage between the branching point and the closing valve. The ball is movable between its stationary position in normal operation and its gas cutting off position in response to an excessive elevation in gas pressure, both of which are located between the closing valve and the branching point in the gas passage.

Abstract: A gas safety valve includes a main body having a longitudinal through hole that defines a gas passage. The longitudinal hole has an inlet end communicated with a gas source, an outlet end through which gas from the gas source exits, a first mediate section adjacent to the outlet end, and a second mediate section between the first mediate section and the inlet end. A spring is mounted in the first mediate section, and a ball is movably mounted in the second mediate section. The first mediate section has a diameter greater than that of the outlet end, while the second mediate section has a diameter greater than that of the first mediate section such that the ball is capable of partially protruded into the first mediate section to block the gas passage defined by the longitudinal through hole. When no gas leakage occurs, a pressure difference between two ends of the ball is relatively small and thus forces the ball to a position not blocking the gas passage.

Abstract: An apparatus to permit or stop the flow of water through a conduit is described as having a microprocessor which contains a real time clock, day of the week indication, and an elapsed time clock. Data relating to the quantity of water flowing at any given moment is supplied by a flowmeter to the microprocessor. Primary and subsetting information is supplied to the microprocessor to determine the maximum allowable quantity of water that may flow over a specified period of time. The subsetting parameters override the primary information if so enabled and supply replacement information for certain periods of time. The elapsed time clock is reset whenever the flow rate becomes zero (no water flowing) or when the predetermined period of time is exceeded prior to exceeding the predetermined quantity of water that is allowed to flow within that period of time. If the flow of the predetermined quantity of water is exceeded within the predetermined (allowable) time frame, a solenoid is energized.

Abstract: An automatically actuated regulation system for a natural gas pipeline having flow control unit, a vibration sensor, a gas flow meter, a trigger unit, and a microprocessor. The microprocessor actuates the flow control unit when two conditions are met. First, there must be a vibration which surpasses a predetermined threshold. Second, flow in the natural gas pipeline must have increased over the flow rate before the vibration.

Abstract: A flow sensor device includes a main passage having a normally open shut off valve therein which is configured to shut off at a predetermined rate of air flow therethrough. The shut off valve includes a seating structure and a centering structure positioned within the main passage, a sealing member being positioned between the seating structure and centering structure. The sealing member is biased toward the centering structure by a resilient member. Air flow through the main passage exerts a force on the sealing member which pushes the sealing member toward the seating structure. When the force caused by the air flow exceeds the opposing force of the resilient member, the sealing member contacts the seating structure in a sealing relationship such that air flow through the main passage is substantially eliminated. The flow sensor device may also include a controllable release valve and/or a controllable reset valve, enabling control of the shut off valve of the main passage.

Abstract: A safety valve or a compressed gas cylinder is formed by a tubular assembly projecting into the access port of the cylinder and axially controlling a control valve and elongated stem axially connected with the control valve projects into the passageway formed by the tubular valve assembly to maintain a valve off seat. In the event the control valve is damaged or broken off and the stem removed the safety valve is biased closed with its seat by pressure drop across the position of the valve seat with minimal loss of gas.

Abstract: A safety shut-off system especially adapted for propane delivery trucks and the like utilizes a pressure differential switch to immediately close the outlet valve of the cargo tank in the event that the differential between an initial reference pressure in the system and the current delivery pressure becomes high enough. When the delivery process is started, both sides of the pressure differential switch are simultaneously exposed to the delivery pressure so that the switch remains in a standby condition. As the delivery pressure becomes stabilized, a timer closes a trapping valve on the high pressure side of the pressure differential switch, trapping a quantity of fluid against the high pressure side of the switch to comprise a reference pressure.

Abstract: A frangible hydraulic fuse includes a fitting secured to a sleeve by a plurality of frangible pins. In normal operation, hydraulic fluid flows through the fuse through radial ports of a sleeve to which the fitting is engaged by the frangible pins. A compression spring urges a poppet slideably positioned in the sleeve to a position out of engagement with the radial ports. Upon rupture of the frangible pins, the fitting is released and hydraulic fluid may flow unimpeded through the radial ports creating a pressure drop which causes the slideable poppet to move to a position overlying and closing the radial ports.

Abstract: A domestic water valve assembly protects against water leaks by closing a valve if a leak is detected. A leak is detected when a water flow rate falls below a predetermined low flow rate for a length of time longer than a predetermined time-out period or when the water flow rate exceeds a predetermined high flow rate. The predetermined high flow rate, low flow rate, and time-out period may be changed by an operator. When a leak is detected, a control system activates an electric motor to close a valve, the valve remaining closed until reset by the operator.

Abstract: The present invention relates to a fluid cylinder pressure check valve device, for use during the recharging of cylinders with fluid(s). In use, the invention is attached to a valve assembly of the cylinder so that when the valve assembly is opened, residual pressure within the cylinder may be determined to enable more efficient recharging. The invention also allows cylinders containing gas mixtures to be recharged to attain enhanced composition uniformity.

Abstract: The invention takes as its basis the problem of creating a safety sealing device for gas pipes by which the bearing of the valve body should be frictionless, require no maintenance and which causes only minimal flow resistance. Further the safety sealing device should not require outward sealing connections. It should be easy to install and able to be fitted into existing gas piping or fittings without having to change them.The problem is solved in that with safety sealing devices with a valve body (6) which can be pressed against a valve seat (1), whereby the valve body (6) is supported so that it is movable in the axial direction of the valve seat (1) is against the force of a locking spring (8), the valve body is conducted only through a spring and is otherwise freely movable without additional support points.The invention concerns a safety sealing device for closing gas conduits in cases of damage, e.g.

Abstract: A gas control valve includes a bore and a room formed in the upper portion and lower portion and includes a valve seat formed between the hole and the room, and includes an inlet and an outlet pathway. A plate is slidably engaged in the room and has two posts slidably engaged in the body. A ball member is supported on the plate for engaging with the valve seat so as to block the passagewayu from the room to the bore. A rod is slidably engaged in the bore for disengaging the ball member from the valve seat. The ball member is forced to engage with the valve seat in order to block the gas passageway so as to prevent the gas from flowing through the outlet pathway when the gas has a pressure large enough to force the ball member to engage with the valve seat. The plate may be adjusted relative to the valve seat in order to adjust the distance between the ball member and the valve seat.

Abstract: A seismic safety apparatus has a housing having an internal space and an external surface. A seismic safety activating mechanism is provided inside the housing for activating a seismic safety device. The seismic safety activating mechanism includes an inertia ball recess located in the internal space, an inertia ball in the housing that has an unactuated position on the recess and an actuated position displaced from the unactuated position on the recess. The inertia ball recess is formed so that when the inertia ball is in the valve member recess, vibrations or seismic shocks of a predetermined magnitude cause the inertia ball to move from the unactuated position to the actuated position. An engagement component inside the housing is provided as part of the seismic safety activating mechanism at the actuated position for engagement with the inertia ball when the inertia ball is displaced from the unactuated position.

Abstract: A gas leak sensor shutoff valve includes a cylindrical body having a connector nipple secured in an inlet port and adapted to be secured to a gas supply pipe. An internal bore extends within the body and joins the inlet port in coaxial fashion. The internal end surface of the connector nipple includes a pair of diametrically opposed slots. A valve assembly is translatably disposed within a stepped valve chamber in the bore. The valve assembly includes a cylindrical sidewall closed at one end, and a pair of opposed holes extending through the sidewall. A gasket is secured to the closed end of the valve assembly, the periphery of the gasket extending outwardly from the valve assembly to impinge on an annular shoulder within the bore. A flow path extends from the connector nipple, through the slots in the internal end of the connector nipple, past the gap between the sealing gasket and the annular shoulder, and through the holes in the cylindrical sidewall to the distal end of the internal bore.

Abstract: A water supply control apparatus includes a flow sensor, connected to a supply line of an indoor plumbing network, which sends a flow signal to a controller when flow is detected. The controller includes a power circuit which is interrupted upon detection of flow, thereby causing a shut-off valve to close. Moisture sensors and temperature sensors can also be coupled to the controller so that the shut-off valve can be closed in response to the detection of moisture or an incipient freeze condition.

Abstract: An actuator has been developed for actuating a valve for controlling fluid flow in a conduit, the actuator having, in one aspect a housing with a main interior housing space, a rod with a mid-portion, a top end and a bottom end, the mid-portion movably disposed in the housing, the bottom end movably extending from the housing and interconnected with the valve, a first piston member secured to the rod and movable in the housing as the rod moves, a second piston member movably disposed in the housing above the first piston member, the second piston member movable to contact the first piston member, first power apparatus for moving the rod to open or close the valve, and second power apparatus for moving the second piston member to contact the first piston member moving the first piston member and the rod to close the valve. In one aspect the rod has a stop shoulder above the first piston member, and the second piston member is movable to contact the stop shoulder to move the rod.

Abstract: A water safety valve, system and method for detecting and shutting off water flow due to leaks or breaks in a water line in which the water flow is at a very low rate on the order of three to five fluid ounces per minute but having the capability of passing large flows of three hundred to five hundred times this amount. The system provides an automatic fluid shut off with an over-ride timer with an automatic return to normal operation when a predetermined period has expired. It further allows simple shut off and activation of the system with a single conveniently located control.

Abstract: A gas leak sensor shutoff valve includes a cylindrical body having a connector nipple secured in an inlet port and adapted to be secured to a gas supply pipe. An internal bore extends within the body and joins the inlet port in coaxial fashion. The internal end surface of the connector nipple includes a pair of diametrically opposed slots. A valve assembly is translatably disposed within a stepped valve chamber in the bore. The valve assembly includes a cylindrical sidewall closed at one end, and a pair of opposed holes extending through the sidewall. A gasket is secured to the closed end of the valve assembly., the periphery of the gasket extending outwardly from the valve assembly to impinge on an annular shoulder within the bore. A flow path extends from the connector nipple, through the slots in the internal end of the connector nipple, past the gap between the sealing gasket and the annular shoulder, and through the holes in the cylindrical sidewall to the distal end of the internal bore.

Abstract: The present invention comprises of a reset mechanism particularly suited for use within magnetic valves. The reset mechanism will insure the desired return of a magnetic valve to its normal position even though there exists an imbalance of fluid pressure between the magnetic valve's inlet and outlet passages. The reset mechanism's principle of operation is the creation of a pressure differential across a reciprocating valve to return the valve to its normally open position in a snap action movement. After said magnetic valve has dosed in response to a pre-determined excess of fluid pressure, thus blocking off communication between the inlet and outlet passages, a reset valve is actuated to establish a communication through a reset passage that creates a pressure differential that eliminates any opposition to and effectuates the immediate return of the magnetic valve to its normally open position in a snap action movement without having to equalize pressure across the magnetic valve.

Abstract: A relief valve for the hydraulic fuse minimizes the chance of a device such as a hydraulically powered lift device from collapsing upon a break in a hydraulic input line to a cylinder powering the lift. The relief valve comprises a valve seat biased in a first direction by a relatively heavy spring and a hydraulic fuse biased away from the valve seat by a relatively light, second spring. Upon a break occurring in the hydraulic input line, back pressure urges the fuse to seat against the valve seat, thus closing the valve. Upon applying additional hydraulic pressure in the direction of the fuse, the valve seat disengages from the fuse, allowing hydraulic fluid to flow through the relief valve and thus allowing a piston in the hydraulic cylinder to retract so as to permit lowering of the lift device.

Abstract: A well pressure monitoring system in which a hydrocarbon fluid is being produced through a Christmas tree or similar flow controller apparatus. Well pressure is transmitted through a tap-off communicated to a pressure sensor. The pressure is thereafter transmitted to a base or control station. To avoid a major uncontrolled flow of the hydrocarbon from the well in the event of inadvertent breakage or accident to the monitoring system, an excess flow control valve is positioned between the well flow and the pressure sensor. The excess flow valve functions to cut off fluid flow, but is provided with a vent passage in the valve actuator through which a minimal amount of the hydrocarbon can escape. When the damage to the monitoring system has been overcome, the vent passage will allow a downstream pressure build-up in the closed system, thus permitting a biasing spring to automatically reset the valve to open and operable position, thereby stabilizing the pressure acting on the actuator.

Abstract: A water flow monitoring system for determining the presence of leaks in plumbing pipes having water flowing through the pipes under high pressure includes a flow monitor which is mounted to the pipe for sensing the flow of water through the pipe. A timer and/or accumulated volume meter is associated with the flow monitor to determine when the flow has continued for a preselected period of time, and/or when the amount of water has exceeded a preselected accumulated volume threshold. Upon detection of flow for the preselected period of time, and/or preselected accumulated volume threshold, a valve is actuated to stop flow through the pipe.

Abstract: A safety valve includes a tube and a valve device. The valve device is substantially a cylindrical member with an end thereof coupled to an outlet of a gas container by a mounting device. The other end of the valve device has a threading portion for engaging with a first end of the tube whose second end communicates with a burner. The valve device has an inner gas passage which tapers to form a neck adjacent to the threading portion thereof. A stem hole is formed in the threading portion and communicates with the neck. Also formed in the threading portion are two slits which also communicate with the neck. A valve stem has a stem portion received in the stem hole and a valve head in the inner gas passage. When leakage occurs downstream of the valve device, the valve stem is moved toward the neck, and thus blocks the slits, thereby preventing from escapement of subsequent gas remained in the inner gas passage and in the gas container.

Abstract: A valve adapted to be disposed in a conduit for a flowing substance which may be a liquid or gas comprises a lower valve housing for allowing fluid under pressure to enter the valve. As flow under pressure enters the valve body it forces a float ball to float inside the valve body. When a rupture in the conduit occurs and allows the flowing substance to exceed the normal amount of pressure, the float ball rises to and engages an upper valve housing ball seat where the float ball sits thereby sealing and shutting off the valve from escape of the flowing substance. When the problem has been rectified, the valve can be reactivated by removing a lock member and simply pressing a reset button.

Abstract: The invention is directed to a control system for automatically shutting off fluid flow in a fluid system responsive to the detection of leaks or other unwanted fluid flow therein. The system is intended to be relatively inexpensive and easy to install so that it is accessible to homes and business owners of all types. Also, the system is intended to be very accurate and quickly responsive to the detection of a leak to limit fluid loss in the fluid system to thereby minimize any damage.

Abstract: An elastically movable valve having a through hole is installed at a required position in the path of a fluid. At the time of normal operation, the fluid is allowed to pass through the through hole, but if the fluid pressure is increased to a certain level over that of normal operation, the valve is elastically deformed by this high fluid pressure allowing it to come into contact with its valve seat and stopping the fluid flow.Since it has no sliding part for the motion of a movable valve. The dust are not generated and, the fluid used in a fluid circuit requiring a high degree of cleanness is always guaranteed to have a high degree of cleanness. As there is no space for the fluid to stagnate, the new fluid is not partially contaminated with the previous fluid after exchanging fluid.

Abstract: The fluid control device of the present invention combines a flow sensing unit in series with a control valve. The flow sensing unit is of the displacement piston type and the flow rate is electronically sensed. A single action poppet valve assembly facilitates the use of a self contained power supply for use in remote locations. A microprocessor monitors parameters including pressure, flow rate, temperature and flow volume, and is enabled to activate the control valve to the open or shut positions based upon any combination of the monitored parameters.

Abstract: An air valve having a runaway control feature, including a movable piston which is insertable into air blocking position in a valve passage, a diaphragm separating two chambers, one chamber being coupled to the air passage upstream of the movable piston and the other chamber coupled to the air passage downstream of the movable piston, a rod movable by the diaphragm to activate a second air valve, the second air valve controlling the flow of air from the air passage upstream of the piston valve to the piston valve itself, thereby forcing the piston valve to move into air closure position in the passageway when the pressure drop upstream and downstream of the piston valve exceed predetermined limits. The invention includes a test feature which includes a third valve for manually unbalancing the air pressure across the diaphragm chambers to simulate the runaway air flow condition and thereby actuate the piston valve closure.

Abstract: The valve has a casing with inlet and outlet ports, and a valve opening bordered by a valve seat communicating the ports. A flexible diaphragm defines a control chamber and a pressure chamber on opposite sides thereof and moves between an open position clear of the seat, and a closed position against the seat. The valve seat is within the pressure chamber, and the diaphragm is normally urged closed. A flexible bellows extends between and is sealed to the diaphragm and the casing on a side of the diaphragm remote from the seat. The bellows provides a bellows chamber isolated from the control chamber to enclose an effective area of the diaphragm generally equal to the valve opening of the valve seat. The diaphragm has an orifice providing limited communication between the control and pressure chambers and having a size sufficient to reduce fluid flow between the chambers to reduce diaphragm speed and thus chances of hydraulic hammer.

Abstract: A fluid control device for hydraulic systems is provided having closure means movably positioned within a valve housing and adapted to selectively close a fluid passageway in response to a predetermined pressure level. The closure means includes a piston body slidably located in the valve housing for reciprocating movement therein and a spring adapted to bias the piston body away from a shoulder to maintain the fluid passageway open during normal operation. The piston body includes a conical nose and a plurality of flow channels (or apertures) which allow fluid to pass through the piston body during normal flow. When the fluid pressure is large, indicating a downstream break or leak in the flow line, the fluid pressure will overcome the force exerted by the spring and force the piston body against the shoulder, thereby blocking the flow pathway and stopping flow through the device.

Abstract: A safety valve which prevents the discharge chute from rapidly falling due to a sudden loss of hydraulic fluid pressure. The valve is located between the chute lift cylinder port and hydraulic system hose. The valve is actuated when the flow leaving the chute lift cylinder exceeds a predetermined flow. The valve immediately stops the hydraulic fluid from leaving the chute lift cylinder maintaining the position of the discharge chute.

Abstract: A gas regulator with several stage adjustments comprises a main body, two regulating bases and two pressure regulators provided in two--one upper and the other lower--chambers in the main body for regulating the pressure in both chambers, two regulator caps to close up a top and a bottom side of the main body, a restoring unit for releasing a stopper in a micro adjusting unit from an opening of a first passageway to restore ordinary gas supply in case of automatic stoppage of the opening by extremely large gas flow caused by leakage, and a micro adjusting unit having the stopper to be adjusted in its position to change sensibility of stopping gas supply in case of disorder.

Abstract: Disclosed is a new and novel poppet type safety valve useful in flow conduits in fluid storage well systems. The safety valve is programmable to automatically close at various predetermined ratios of production mass flow rate-ambient pressure to prevent undesirable high flow rates or uncontrolled out-flow of fluid stored in a reservoir if the flow conduit or wellhead is damaged. This safety valve is lowered into and locked and sealed in a landing nipple in the well conduit. The safety valve has a variable bias which biases the valve member toward open position and a variable flow restrictor which is automatically actuated by a sensing actuator continually sensing reservoir pressure to vary the restricted annular flow area between the valve housing and inside of the well conduit for closure at the desired flow rate. The valve element has a through flow passage with locking recesses in the flow passage into which the sensing actuator may be releasably locked.

Abstract: A gas regulator with an adjustable safety device has a main body, and two pressure regulators inside the body to regulate the gas pressure inside the body at a stabilized value to flow to a gas stove or the like. The regulator also has a micro adjusting device to stop gas supply in case of large gas flowing such as gas leakage by a steel ball blocking up an end opening in a tube in the micro adjusting device, and the distance between the steel ball and the end opening in the tube can be adjusted to change sensitivity of the ball so as to acquire the best possible safety for gas leakage. A recovery unit is provided to recover the position of the ball from the end opening in the tube if the ball is sucked to block up the end opening in case of gas leakage.

Abstract: This invention relates to a self-actuating safety valve arrangement, and includes a main valve housing having an inlet and an outlet for connection in a high pressure fluid line. A valve member is carried slidably within the main valve housing and is movable from an open position, in which it allows the passage of fluid through the fluid line, to a closed position. An auxiliary inlet port is formed in the housing and communicates with one end of a feedback line. The opposite end of the feedback communicates with an outlet port of a pilot valve, which is actuated by means of an orifice plate located in the fluid line downstream of the valve member. A lowering in pressure in the fluid line, generally caused by a downstream rupture or breakage, causes the orifice plate to close the pilot valve, which results in a drop in pressure in the feedback pipe. The main valve member is arranged to move to the closed position in response to the drop in pressure it experiences via the feedback pipe.

Abstract: A safety valve is adapted to fit into the stem of a conventional service valve of a high pressure gas cylinder to prevent the escape of gas when the external part of the service valve is broken off. A plunger within the safety valve is biased away from a valve seat until a high pressure differential exists within the flow channels.

Abstract: A fluid shutoff device for use as a safety device to cut off the water supply to a building in the event of overly high water consumption due to a leak or break in the plumbing in the building is provided with a motor that is responsive to remote actuation to rotate a three position selector valve to a desired flow setting. The selector valve is settable in a position which allows water to flow freely through the safety flow control device as if it were not there, a position which diverts water through a safety flow pathway, or a position that prevents water flow into the main water line entrance of the building, thereby allowing the invention to act as a shutoff valve. At least one optoelectronic device is included in the safety device to monitor the flow position of the selector valve by detecting the absence or presence of light reflected off a sensor drum that rotates in synchronism with the selector valve.

Abstract: An apparatus for automatically controlling the flow of fluid in an inlet conduit that provides the water supply for a home or building so as to prevent water damage due to a failure in the water system when unattended. The apparatus comprises a power circuit for supplying a low voltage DC power output which is connectable to a standard AC power source and includes an internal battery which operates in case of AC power failure. A flow sensor and a shutoff valve are connected in the inlet conduit. A control circuit which can be preset for different operational modes, receives and processes flow status signals from the flow sensor and provides output signals that control the shutoff valve, so that if continuous flow is detected in the conduit for a time period exceeding a preselected time, the shutoff valve will automatically close.

Abstract: The safety valve assembly of the present invention for use in a closed fluid system comprises a valve housing including a central throughbore divided into an inlet end and an outlet end which communicate with one another via an axial passageway parallel thereto. Access to an inlet of the passageway is controlled by a valve element which is movable between a standby position solely in response to a differential fluidic pressure developed when a leak develops in the closed fluid system downstream of the safety valve assembly to isolate the leak from the remainder of the system. A bleeder valve assembly is also provided to return the assembly to a standby position thereof once the downstream leak has been eliminated.

Abstract: A gas pressure regulator includes a throttle valve provided between a gas inlet passage having an orifice formed therein and a pressure sensing chamber pertaining to a gas exit passage, the throttle valve having a sealing plug fluidically drafted upwardly for closing a truncated cone hole of the throttle valve when subject to a surge gas flow of great volume rate due to a gas leakage from a downstream gas line for safety reason, and gravitationally dropping by a gravity of the plug for re-opening the throttle valve for continuous gas supply when just opening a valve of a gas source.

Abstract: A gas pressure regulator includes a throttle valve provided between a gas inlet passage and a pressure sensing chamber pertaining to a gas exit passage, the throttle valve having a sealing plug comprised of a needle and a base float fluidically drafted for closing a truncated cone hole of the throttle valve when subject to a surge gas flow of great volume rate due to a gas leakage from a downstream gas line for safety reason, and upon a simple restoring of the plug for re-opening the throttle valve, a gas stream can be continuously supplied when just opening a valve of a gas source.

Abstract: The present invention relates to a valve designed to be coupled to the inlet of a toilet tank so that water which is flowing into the tank must flow through the valve. The valve includes a gate actuated by a pilot valve sensing pressures across a flow restriction. When the flow rate increases beyond a certain degree responsive to failure of the float valve in the toilet supply tank, the pilot valve is actuated allowing fluid pressure in the line to close the gate valve.

Abstract: A vibration sensitive safety valve for gaseous fluids using a sphere of ferrous material as a valve plug, the ball being held in a sensitive condition, suspended above a complementary valve seat, by a permanent magnet. The magnetic attraction is such that a significant tremor will dislodge the ball, allowing it to drop and plug the valve passage. A flat non-magnetic spacer disc on the bottom of the magnet allows some lateral movement of the valve ball in response to harmless vibrations, without releasing the ball to close off the valve. A moveable mass within the ball absorbs the effect of minor vibrations.

Abstract: A flow rate of gas is measured with a flow rate measurement means and a "consumption state" defined with a combination of maximum flow rate, the total amount and a consumption time of the gas is therefor detected. The consumption state is compared with a reference consumption condition which is represented by a predetermined consumption state, and when the consumption state exceeds the reference consumption condition, supply of the gas is interrupted. Furthermore, a monitor range of the consumption state is formed, and when a consumption state is present in the monitor range, the reference consumption condition is changed.

Abstract: A leak detector and shut-off apparatus shuts off hydraulic fluid downstream o prevent the hazards attendant hydraulic failure such as loss of fluid and fire. A first sensor is coupled to a supply line for hydraulic fluid to produce pressure differential force F.sub.s, which is representative of the flow of hydraulic fluid. A second sensor is coupled to a return line for hydraulic fluid to produce pressure differential force F.sub.r that is representative of flow of hydraulic fluid. A compensator creates representation F.sub.c of the rate of accumulation of hydraulic fluid in the hydraulic circuit downstream of the device and a safety margin. A shutoff mechanism is connected to the first and second sensors and the compensator to shut off the supply and return lines when F.sub.s is greater than the sum of F.sub.r and F.sub.c.