Abstract: A system for transferring a product from a source which includes a safety cut-off feature for preventing the transfer of the product. The system includes a tubular member adapted to handle the transfer of the product therethrough, a remote connector, a product connector, and an electric circuit. The tubular member has a proximal end, a distal end, and at least two separate conductive paths, including first and second conductive paths, each extending between the proximal and distal ends. The remote connector is attached to the distal end of the tubular member for conductively connecting the first and second conductive paths in series. The product connector supplies the tubular member with the product from the source and conductively connects to the second conductive path, whereby the product connector and the tubular member define a product transfer path.

Abstract: A water leak detection valve system is provided including a water inlet pipe for receiving an unlimited amount of water. Also included is a water outlet pipe for supplying various water appliances within a building with water. A water valve is connected between the water inlet pipe and the water outlet pipe. The water valve is adapted to preclude the flow of water therebetween upon being closed. Next provided is a water flow monitor device connected between the water inlet pipe and the water outlet pipe. The water flow monitor device serves to monitor the current flow rate of water through the water pipes and further begin a timer upon the beginning of water flow after each cessation of such water flow, wherein the timer continues to track time only as long as water flow continues. The water flow monitor device is further adapted to close the water valve upon certain criteria being met.

Abstract: A valve assembly senses the cumulative volume of hydraulic fluid that has passed to an actuator and senses and subtracts from that cumulative volume the volume of return fluid that has passed from the actuator. When the difference between the volumes exceeds a preset value, the system shuts off the flow to the actuator to prevent further loss of fluid from a leak. The assembly may employ separate sensors in separate pressure and return lines or a common line with a common sensor which reverses signal polarity when flow reverses. Target flowmeters with signal adding and subtracting circuits may provide the differential volume information.

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 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: A safety valve for precluding leakage of a fluid from a ruptured conduit. The inventive device includes a sensing conduit having a center bore and a matrix of bores concentrically positioned about the center bore. A valve is positioned in fluid communication with the center bore of the sensing conduit and normally permits passage of hydraulic fluid therethrough. A pneumatic actuator is mechanically coupled to the valve and fluidly communicates with the matrix of bores in the sensing conduit. The pneumatic actuator and the matrix of bores can be pneumatically pressurized such that a rupturing of the sensing conduit will effect closure of the valve to permit continued operation of a remainder of a hydraulic system.

Abstract: A hemodialysis apparatus is supplied with dialysis fluid or a dialysis fluid component through a supply loop conduit 12. A shut-off device 22, such as a magnetic valve, is arranged between the apparatus and the supply conduit 12. A buffer volume is enclosed between the shut-off device and an additionally arranged shut-off device such as a non-return valve. During disinfection of the apparatus, in order to prevent disinfecting fluid from flowing back into the supply loop conduit and therewith an endangering other dialysis apparatus connected to the same supply loop conduit, in the event that the shut-off device 22 leaks, the buffer volume is pressurized to a defined pressure, which is preferably higher than the pressure in the surrounding conduit sections. This pressure is detected by a pressure sensor P. The signal generated by the pressure sensor P is monitored by a microprocessor 28.

Abstract: A hydraulic control valve assembly is described comprising a cut-off valve, a control valve and structure for connection to at least a supply line, a hydraulic apparatus line and a return line. The assembly is constructed and arranged such that the cut-off valve is bistable and controls flow of pressurised fluid from the supply line to the control valve, permitting it when primed and preventing it when closed, and the control valve controls the pressure of fluid supplied to the hydraulic apparatus line. In addition structure means are provided to initiate priming of the cut-off valve, complete the priming of the cut-off valve provided the supply line pressure is above a first predetermined pressure, and maintain the priming of the cut-off valve provided the supply line pressure remains above a second predetermined pressure.

Abstract: A gas flow safety valve assembly having a main housing of generally solid rigid construction with a main interior chamber divided into an upper compartment and a flow through compartment by a primary diaphragm. Further, the main housing includes an inlet passage leading into the flow through compartment and an outlet passage leading out of the flow through compartment. Upon a gas flow pressure within the flow through compartment dropping below a predetermined minimum acceptable gas flow rate, the primary diaphragm is downwardly displaced resulting in the engagement of a primary displacement member connected thereto with a lever element pivotally positioned within the main housing.

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 gravity flow chemigation system (10) is disclosed which generally consists of chemical supply tank (37), in which chemical (29) is contained, a supply line (37) connected to the bottom of chemical supply tank (36), and a low-level shutoff valve (11) suspended across an irrigation ditch (39) and partially below the surface of irrigation water (38). Chemical enters the valve (11) from supply line (37) through air vent tube (21) and inlet (18). The chemical (29) within supply line (37) will continue to flow through valve (11), out outlet (15) and through outlet screen (28) to mix with irrigation water (38) as long as the level of irrigation water (38) remains at a level above converging valve seat (16) of lower float valve (13). Once the level of irrigation water (38) falls below valve seat (16), lower float (17) will engage the lower converging valve seat (16) and close off the valve which will not reactivate until manually reset, even if the irrigation water level rises.

Abstract: This hydraulic valve has a housing (2) with a feed line (12) and a discharge line (14) for a fluid. A sealing point is provided between the feed line and discharge line. A spring acts in the closing direction on the sealing point via a piston.The aim is to create a hydraulic valve which requires no additional energy source. This is achieved when the piston (8, 23) can be moved in the opening direction merely by a total of the pressures present in the feed line (12) and in the discharge line (14).

Abstract: A system for selectively delivering cold, lukewarm, warm or hot water to a bath, shower and the like is controlled by water temperature function switches arranged in cascade series at a control panel in order of priority descending to hot water. When a water temperature function switch corresponding to no water flow or water flow at the desired temperature is closed, a low voltage DC signal is sent to logic circuitry which, in turn, sends a low voltage DC signal to appropriate relays which control the operation of solenoid-operated valves, the inlets of which are connected to hot and cold water mains, the outlets of which are connected to a water delivery conduit leading to the bath, shower and the like. The logic circuitry comprises a pulse shaper circuit, a reset pulse circuit and a gate pulse circuit. A flow detector in the water delivery conduit senses when water flow therethrough has ceased, and sends a signal to the reset pulse circuit, which in turn signals the logic circuitry to shut down the system.

Abstract: A safety device for gas welding has a cylindrical main body having a flow path for an inflammable gas. A cylindrical cover is mounted on the outer periphery of the main body in such a manner that it can reciprocate on the outer periphery. The main body is provided with a normal-flow indicating mark and a counter-flow indicating mark which are positioned in space-apart relation on the outer periphery of the main body. One of the counter-flow and normal-flow indicating marks is exposed and the remaining one is covered alternately, depending on whether the flow condition is counter-flow or normal-flow.

Abstract: A vehicle wheel that includes a valve which has a check device, with the wheel being intended for use with a pneumatic tire that even when operating as a tire which is flat or has otherwise lost pressure permits great distances to be covered at a reduced speed. To prevent misuse of the tire, in other words reinflation of a tire subsequent to flat-tire operation and before the tire has been checked for leaks, the valve is provided with a mechanism that prevents such misuse. This mechanism is pneumatically disposed in series with the check device and is installed in an open position and in such a way that it changes over into a closed position upon commencement of a flat-tire operation, with a special tool and/or special replacement parts being required in order to reestablish the open position of the mechanism.

Abstract: The present invention deals broadly with the field of plumbing. More narrowly, however, it deals with apparatus for controlling flow through a fluid supply line. The preferred embodiment of the invention is directed to a mechanism for automatically terminating flow through a fluid supply line when flow through the line continues for a period of time greater than a defined time, such as when a break in the line occurs.

Abstract: A main fluid passageway is provided in a main valve body between first and second ports formed and an auxiliary passageway having its opposite ends closed is also formed in the valve main body so as to intersect the main passageway. A spool is slidably mounted in the auxiliary passageway and gap spaces are provided at the opposite ends of the spool. One of the gap spaces communicates with the first port, while the other gap space communicates with the second port. A locking section is provided on the spool and a cooperating latch is provided in the valve main body. Upon occurrence of an emergency, the spool is moved to shut off the main passageway and the latch is caused to engage the locking section resulting in generation of an alarm. Under such condition, even if the pressure of the fluid at the valve varies, the locked condition of the spool can be maintained.

Abstract: In a gas pressure regulator a switch valve is provided in a throttle nozzle between an inlet passage and a pressure sensing chamber containing a diaphragm controlling a lever arrangement. The pressure regulator is capable of both pressure reduction and automatic shut off if there is a leak due to gas line damage or other conditions. Preferably a restoring mechanism is provided to reset the regulator after its automatic shut off.

Abstract: The invention provides a low pressure shut off device contained within a pneumatic tool that senses the air pressure of an air stream supplied to a pneumatic motor and shuts off the air flow when the pressure falls below a predetermined level set to maintain consistent performance of the tool and to avoid damage to the tool or to the workpiece. The invention includes a throttle valve, a throttle piston that moves to open and close the valve, and a device for sensing the air pressure of the supply stream, holding the throttle valve open when the pressure is sufficient and closing it when the supply pressure is insufficient. The invention may also be used in combination with an air control system within a pneumatic tool such that the sensing device shuts off the flow of air to the air control system as well as the motor when the air control system pressure is insufficient.

Abstract: An apparatus for controlling the flow of fluid through a conduit is disclosed. The conduit permits normal flow of fluid through the conduit and detects abnormal flow of fluid which is due to a catastrophic failure of the fluid system or is due to intermittent flow of fluid caused by a leak in the fluid system. The apparatus is particularly useful in determining the abnormal flow of fluid through conduits where the normal flow of flow is erratic. The apparatus can be modified to change the parameters defining abnormal flow in the system.

Abstract: A pressure chamber through which the fuel in the fuel line passes, having a diaphragm moving to advanced position by the pressure in the chamber. A PE cell is arranged with light rays passing through the chamber and when the diaphragm is retracted it breaks the light rays and shuts off the circuit but when it is advanced the light rays are not broken and the circuit is energized. A valve in the fuel line has a closer which is moved to closed position when the circuit is de-energized and it remains closed until opened manually for resetting the circuit.

Abstract: There are disclosed several embodiments of a fail safe gate valve and actuator having means for yieldably urging the gate from one position to which it is moved under one or more controlled conditions to its other position upon failure of one such condition, means including a handwheel mounted on the actuator for moving the gate to its one position, and means automatically responsive to a control signal for rendering the handwheel inoperative to move the gate to its one position upon reestablishment of said one controlled condition. In certain embodiments, the control signal is automatically responsive to the reestablishment of said one controlled condition; and, in another embodiment, it is automatically responsive to the failure of said one controlled condition. The controlled conditions are disclosed as being one or both of a predetermined fluid pressure condition, and or a predetermined environmental temperature condition.

Abstract: A blanking cover for a pipe comprises a plate able to close the pipe by tilting or rocking under the action of gravity, about a pivot pin to which it is fixed. A part is fixed to the pin, and an electromagnet able to retract the part and fixed to another part rotates on the pin and a jack is provided for actuating the other part. When excited, by attracting the part, the electromagnet makes it possible to keep the pipe open. Its deexcitation leads to the tilting of the plate and consequently to the closing of the pipe. If a tilting or rocking problem occurs, the action of the jack on the other part brings about the tilting by displacing the part. In order to reopen the pipe, the jack is actuated so as to press the excited electromagnet against the part and is then actuated in the opposite direction.

Abstract: A water shutoff valve is disclosed in the preferred embodiment comprising a cylindrical body having a valve disk and water flow sensor therein. The sensor is operatively connected to a timer which automatically resets to zero upon interruption of water flow through the valve. The valve automatically closes upon continuous flow of water through the valve for a predetermined period of time, indicating a potential leak in the water supply line. The timer may be set for selected time intervals permitting the valve to remain open for short or long intervals as required.

Abstract: A pneumatic relay valve is actuated by a pressure differential determined by the respective surface areas of two opposing surfaces of a piston moveable within the valve body. A first pressure (pilot signal) to be monitored maintains the piston member of the valve in its "in-service" position, blocking all ports in the valve body. Upon the occurrence of a sufficient pilot signal pressure drop, a second continuous common supply pressure moves the piston to a "tripped" position, sealing off the pilot signal inlet port to enable the second (common supply) pressure to bleed to the atmosphere. This sudden loss of common supply pressure causes a common supply relay valve to "trip," closing off all common supply fluid pressures to each of a plurality of first relay valves. Only upon reinstatement of the first interrupted pilot signal pressure may the relay valve be manually reset to the "in-service" position and maintained in that position by sufficient pilot signal pressure.

Abstract: Valve means associatable with free traveling spherical means are sealing engageable onto and wipable off of companion seats to selectively control flow. A spool permits selective movement of the head means to the seat means and selective engagement of the head and seat means upon shuttling.An interface assembly comprises means which are extendible to the spool and a piston head element within the housing and carried around an extension for travel along the extension in response to pressure variation. The piston head is shiftable in a first direction in response to fluid variation for travel along the extension for transfer of the spherical means within the piston from one camway to another camway without movement of the spool within the housing.

Abstract: A monitor-actuator pilot valve operable to close a safety valve in a fluid flow system reponsive to low line pressure or electrical failure. The safety valve is held open by pressure supplied into an actuator cylinder from the line protected by the safety valve. The pilot valve includes a first flow passage communicating with line pressure, a second flow passage communicating with the safety valve actuator cylinder, a third exhaust flow passage to the atmosphere, and a fourth flow passage to a fluid pressure reset. A valve assembly in the pilot valve responds to a low pressure in the first passage or electrical failure to connect the second and third passages for exhausting control pressure from the safety valve actuator cylinder to close the safety valve. An electromagnet on the pilot valve releases the valve assembly in response to a power failure allowing the safety valve to close. A reset assembly in the valve body manually or hydraulically operates the valve assembly reopening the pilot valve.

Abstract: A check valve which closes more rapidly to prevent wearing of the valve seat and of the valve member that seals thereagainst, including a solenoid or other actuator that aids the normal spring to quickly close the valve at approximately the time when downpath fluid flow would stop, the actuator then being deenergized. The control circuit that operates the actuator can include a pair of pressure sensors sensing pressure both upstream and downstream from the valve seat. Where the valve is utilized to control flow to or from a piston pump, energization of the actuator can be controlled by sensing when the pump piston reaches its extreme of travel.

Abstract: A device for controlling the supply of fluid to a valve actuator, thereby controlling the opening and closing of a valve, all in response to an input signal. Means are provided whereby once fluid communication between the valve actuator and the actuator fluid source is closed, said input signal alone may not reopen such fluid communication.

Abstract: In a suction apparatus for removing lubricating dirty oil from the crankcase of internal combustion engines a vacuum tank is connected to the crankcase by a suction line via a control valve which shuts off the suction line on completion of the oil suction process.

Abstract: A gas supply pipe is provided with a terminal shutoff valve upstream of a heater, stove or the like. An automatic shutoff valve is provided to the gas pipe upstream of the terminal shutoff valve which automatically closes upon receipt of an electrical signal from an earthquake sensor, fire detector, gas leak detector or other sensor indicating a dangerous condition. A gas pressure sensor provided between the automatic shutoff valve and the terminal shutoff valve prevents the automatic shutoff valve from being manually reset unless the terminal shutoff valve is closed, thereby preventing an explosion which might result if gas were fed to the heater or stove with the pilot light extinguished.

Abstract: There is disclosed herein a gas pressure regulator having valve means for stopping the flow of gas downstream through the regulator when the pressure of the incoming gas is higher or lower than predetermined acceptable values even though acceptable pressure is subsequently restored, and manually operated means for resetting the valve means after it is determined that the pressure of the gas flowing to the inlet of the regulator has returned to said predetermined acceptable values, provision being made for maintaining a high pressure shut-off valve closed until manually opened even though pressure of gas in the regulator returns to acceptable pressure.

Abstract: A pipeline break detection system wherein a rate timer valve is opened in response to a predetermined pressure drop to direct pressure fluid to activate the time cycle of an on-delay valve and, itself commence a time delay closing cycle. If its closing countdown continues to completion, it depressurizes the on-delay output valve and cancels its countdown. However, if the pipeline experiences a further like pressure drop, before the rate timer valve closes, it will be recharged and held open to keep the output valve timer actuated. If the pipeline pressure fails to level off to allow the rate timer valve to close, and the output relay is thus enabled to complete its timed cycle, the output relay opens to deliver a fluid signal.