Abstract: A pneumatically controlled system is provided for detecting and isolating a rupture in one or more lines of a parallel looped gas transmission network employing valve controlled equalizing lines at intervals. When the gas transmission network incorporates three or four mainlines the direction and magnitude of flow in the equalizing lines is sensed pneumatically and a pneumatic signal representing such flow is transmitted to a control module. The control module is effective to close selected mainline valves and equalizing line valves to isolate a ruptured pipeline section while permitting other valves to remain open thus continuing gas transmission in other portions of the transmission system.

Abstract: A reversing valve for a combination meter, including a closure element, movable in the axial direction, which is provided with a cylindrical closure ring which in the closed position of the reversing valve covers radially outwardly directed valve openings, and having at least one channel extending essentially axially associated therewith, which channel is closed in the closed position though already after slight shifting of the closure element in the direction of its open position communicates the working chamber of a hydraulic adjustment member with the main flow. The working chamber additionally has a presettable opening which is always open in the direction of the auxiliary flow or total flow. The effective-pressure-cross section of the closure element is suddenly enlarged inwardly during opening, and is reduced in a sudden manner during closing, by having the main flow act on the working chamber.

Abstract: A lubricating system for automotive components includes an oil reservoir to supply an initial charge of lubricating oil upon cold starting of the engine, with provision to maintain the reservoir in a full attitude after the engine lubricating oil has warmed and is freely circulating, thereby preserving a charge of oil available for the next cold starting of the engine.

Abstract: A safety shut-off valve opening a flow path between the primary and secondary sides in case of usual operation, while shutting off the aforesaid path in response to an emergency shut-off signal, and particularly such safety shut-off valve cannot be reset unitl it is confirmed that there is no more leakage of gas on the secondary side of the shut-off valve after the shut-off action was once effected, thereby to attaining a very high safeness.

Abstract: An improved air-flow regulator for a fixed-bed coal gasifier is provided which allows close air-flow regulation from a compressor source even though the pressure variations are too rapid for a single primary control loop to respond. The improved system includes a primary controller to control a valve in the main (large) air supply line to regulate large slow changes in flow. A secondary controller is used to control a smaller, faster acting valve in a secondary (small) air supply line parallel to the main line valve to regulate rapid cyclic deviations in air flow. A low-pass filter with a time constant of from 20 to 50 seconds couples the output of the secondary controller to the input of the primary controller so that the primary controller only responds to slow changes in the air-flow rate, the faster, cyclic deviations in flow rate sensed and corrected by the secondary controller loop do not reach the primary controller due to the high frequency rejection provided by the filter.

Abstract: The invention contemplates a system of relatively wide-range solenoid control of pressure-fluid flow from a high-pressure upstream source to a downstream load. In a first range of relatively low rates of flow, the system utilizes the solenoid to actuate a pilot valve for controlled exclusive delivery of pressure fluid to the load, via a throttling orifice; in a second range of higher rates of flow, the pressure drop across the throttling orifice becomes sufficiently great to enable pilot-delivery pressure, upstream from the throttling orifice, to open a main-valve line from the source to the load. The arrangement is such that solenoid-actuating force variation within the first range produces a first characteristic of flow-rate delivery to the load, and is also such that solenoid-actuating force variation beyond the first range produces a second and steeper characteristic of flow-rate delivery to the load.

Abstract: A hydraulic control circuit for a cylinder-and-piston unit includes a relatively small electrohydraulically operated servo-control valve, a main pressure conduit including a measuring throttle, an auxiliary control valve cooperating with an additional pressure conduit connected parallel to the main pressure conduit to branch the pressure fluid in response to a predetermined level of pressure difference occurring across the measuring throttle. In this manner the servo-control valve can control a system of pressure fluid which is substantially larger than the nominal flow rate of the servo-control valve.

Abstract: A progressive pneumatic starter device delivers at its outlet an increasing pressure of low flow rate, then a working pressure at a high flow rate. The starter device is provided with a distributor member adapted to connect, in parallel with a calibrated bore, a channel of large section, when a pressure which is greater than a predetermined threshold and which is not derived from the outlet is applied to the distributor member. The starter device is advantageously placed upstream of a pneumatic switch to which it is directly associated for the purpose of shortening its channels for transfer of fluid.

Abstract: A suction-limiting check valve for a crankcase ventilating line which is connected to the engine intake downstream of the carburetor, the valve having two valve devices arranged for parallel operation, each including a spring-biased diaphragm which closes against a valve mouth at a predetermined level of negative pressure, one valve mouth being much smaller than the other to produce an earlier reopening of that valve device under elevated suction on the outlet side of the valve.

Abstract: A device for monitoring the flow of fluid in a pair of conduits and blocking the flow of fluid in a conduit when leakage of fluid is sensed therein. The device is provided with, a pair of inlet and outlet passageways in which fluid flows to and from the conduits, a pair of solenoid operated shutoff valves for blocking the flow of fluid in the inlet passageways and a pair of check valves for blocking the backflow of fluid through the outlet passageways.

Abstract: A method of and an apparatus for discharging containers of solubilized gas, e.g. acetylene, in which the gas is initially drawn as a preference stream from one container or group of containers (e.g. conventional acetylene bottles or tanks) and is fed to the consumer. When the pressure in the tank or tanks falls below a predetermined set point value, thereby indicating that the volume flow rate is less than the mean or average flow requirement, a second tank or group of tanks is connected to provide a complementary flow. The second tank or group of tanks supply the total requirement during replacement of the first tank or group and then forms the preference stream while the replacement tank or tanks of the first group provides the complementary stream.

Abstract: A coupling adapter is disclosed for coupling a remotely-located fluid circulation device and a fluid filter to the fluid reservoir of an engine, transmission unit or other hydraulic system in place of a standard spin-on fluid filter. The adapter consists of a disk-shaped body having first and second spaced-apart end surfaces. First and second cylindrically-shaped cavities extend partially into the disk-shaped body, respectively, from the first and second end surfaces. A plurality of concentric ridges intersticed with concentric grooves is provided in the first end surface surrounding the first cylindrically-shaped cavity. A central wall section within the disk-shaped body separates the first and second cavities. A central bore extends coaxially through the central wall section for receiving and supporting a hollow nipple adapted to align and secure the coupling adapter to the fluid reservoir.

Abstract: An air valve for a fuel supply system of an internal combustion engine is proposed, which assures good start-up of the engine and furnishes a fuel-air mixture required for combustion during overrunning. The air valve includes a housing, which is separated by a diaphragm into a first chamber and a second chamber. The first chamber communicates with the intake tube section dowstream of a throttle valve and the second chamber comunicates first with the intake tube upstream of the throttle valve and second with the intake tube downstream of the throttle valve. A valve plate guided by the diaphragm engages a valve seat sheath which is slidably supported in a mouthpiece. A flow cross section is formed between the valve seat sheath and the mouthpiece. Immediately following starting, additional air can bypass the throttle valve for the purpose of improved starting up of the engine.

Abstract: An improved fresh gas device includes a gas mixer connected to a source of oxygen and to a source of at least one other gas for mixing oxygen to form a gas mixture to be supplied to a patient. A line bypasses the mixer and is provided with a switch for initiating pressure pulses in the bypass line and a pneumatically operated valve is provided downstream of the mixer and is controllable responsive to the pressure in the bypass line.

Abstract: A hydraulic fluid power steering system includes an accumulator which stores a reserve of pressure fluid at pump standby pressure. The charging and discharging of the accumulator is controlled by an emergency steering valve which is operable in response to a predetermined minimum fluid pressure outputted by the steering pump to discharge the stored fluid for emergency steering. The emergency steering valve also has components which serve as a pressure switch which is actuated to complete a circuit through an indicator light whenever the emergency steering valve moves to effect the discharge of the accumulator.

Abstract: In a fluid circulation system of the type having a pump for supplying pressurized fluid to an apparatus requiring a supply of pressurized fluid, a sump containing a volume of fluid from which the pump draws its supply, and an overage fluid return line, a sump level maintenance system including a remote fluid reservoir disposed above the sump, a housing in communication with the fluid in the sump and defining a pair of ports in communication with respective ones of the reservoir and the overage return passage, a float structure operative to open both ports when the sump level is below a low level and to close the port to the reservoir to prevent replenishment when the sump level is between the low level and a high level and to close both ports when the sump level is above the high level to prevent overage fluid from returning to the sump, and a fluid conduit from the overage passage to the reservoir operative to divert overage to the reservoir when the second port is closed thereby depleting the fluid volume i

Abstract: A stabilizer (1) includes a first passage (20-23) which connects a compressed gas source (2-3) to the circuit breaker and a second passage (9, 16, 34, 22) which makes the circuit breaker communicate with the atmosphere, these passages being normally closed, as well as means (10) for opening the first passage when the gas pressure in the circuit breaker is lower than a first value and means (31, 13) for opening the second passage when the gas pressure in the circuit breaker is higher than a second value. Application to high-tension air blast circuit breaker.

Abstract: A steam trap is provided with two paths through which fluid flows from its nput to its output. One path constitutes a control path wherein a small amount of steam or condensate continuously flows through restrictive orifices connected in series between the input and the output. The other path constitutes a main flow path in which a quiet throttling element having a plurality of resistive flow passages and having a moveable valve plug, controls the amount of fluid flowing therethrough. The position of the valve plug and a control piston connected thereto is a function of the fluid flow through the control path between the two orifices; the input and discharge fluid pressures; and a spring connected to the control piston.

Abstract: A device and method for preventing high pressure surges in fluidic material delivery systems to instruments such as a flowmeter, by the use of restrictors and a pilot operated valve to initially restrict the flow of the fluidic material before allowing total delivery thereof to prevent damage to such meters and other type members.

Abstract: There is disclosed an irrigation device of the type comprising a hose which is adapted to be connected at one end to a water supply point and at the other end to a spraying device, a drum which is rotatable to coil the hose during an irrigation process and a turbine to be connected to the water supply point and attached to said one end of the hose and adapted to actuate the drum to coil up the hose at a speed dependent upon the pressure of water passing from the supply point to the hose. Known irrigation devices of this type have suffered from the drawback that it is difficult to maintain the turbine speed within a narrow desired range therefor. The irrigation device of the invention is additionally provided with a bypass pipe equipped with a flow control valve bypassing the turbine and associated means for controlling the speed at which the hose is being coiled onto the drum.

Abstract: A valve installed in a sewer pipe or drain pipe extending from a house or other building to a street sewer pipe or the like which will automatically close when sewage backs up from the street sewer pipe toward the house or building structure thereby preventing back flow from the sewer pipe into the house thereby protecting the basement or other lower portions of the house or building structure from becoming flooded due to sewer backup. The valve is motor actuated and includes a vertically reciprocal gate controlled by a float operated switch structure disposed downstream of the valve to quickly and positively move the valve to fully closed position upon flood conditions existing in the lateral sewer pipe downstream of the valve thereby preventing back flow and flood conditions occurring on the house side or upstream of the valve.

Abstract: An electromagnetic plunger pump of the reciprocating type including a vent valve means which allows only air bubbles in the pump to pass therethrough. This vent valve means is provided in a pressure adjusting plunger fitted in a pressure adjusting cylinder for reciprocating motion. The vent valve means comprises a vent valve rod which is fitted in a through-hole of the pressure adjusting plunger so as to form a passage about the vent valve rod, and a vent valve body which is normally energized by a spring in the direction away from a vent valve seat at a forward end of the pressure adjusting plunger to provide a clearance between the vent valve body and the vent valve seat. This clearance is such that it allows the air bubbles to pass therethrough, while it does not allow a liquid under pressure having a viscosity to pass therethrough with the result that the vent valve means is closed by such liquid under pressure.

Abstract: A hydraulic valve device for controlling a double action, piston-type servomotor adaptable for steering a self-propelled agricultural vehicle and including a pair of identical interconnected valve groups, with each group connected to an opposite side of the servomotor and further connected to a source of pressurized fluid and an exhaust outlet, whereby selective actuation of the hydraulic device creates a pressure difference in a servomotor forcing the piston to move in a predetermined direction.

Abstract: A plurality of spray nozzles are utilized to introduce a fluid into a vessel. Control valves are associated with each one of the plurality of spray nozzles. The control valves are either fully closed or fully open. The actual value of a process variable is compared to the desired value of the process variable to generate a difference signal. Control signals are generated in response to the difference signal. Different combinations of the control valves are opened in response to the control signals so as to provide a fluid flow rate which will maintain the actual value of the process variable substantially equal to the desired value. The on-off nature of the control valves provides a substantially maximum pressure drop across the spray nozzles when fluid is flowing through the spray nozzles.

Abstract: A solenoid powered flow control valve in which the valve spool has split the pump flow across a primary metering orifice and a pilot metering orifice which regardless of spool position maintains a substantially constant flow ratio between the main and pilot flow. The valve spool is controlled by opposing servo chambers which sense the pressure drop in the pilot flow path across a solenoid powered variable orifice.

Abstract: A plurality of aspirating ejector nozzles are fed with primary fluid which is admitted successively past a modulating valve and throttling orifice to the inlet ports of the nozzles with a portion of the primary fluid being arranged for bypassing the nozzle past a bypass valve controlled by pressure responsive means subject to the pressure of the primary fluid upstream of the throttling orifice.

Abstract: The standby supply for delivering pressure fluid to a user component includes a fluid pump as a primary fluid source coupled to the user component by a first check valve, an accumulator as a secondary fluid source coupled to the pump by a second check valve for charging the accumulator and a valve arrangement coupled to the pump, the accumulator and the user component responsive to pressure from the pump to control a connection from the accumulator to the user component.

Abstract: A fuel flow distribution system having a hydraulically actuated flow sensing valve, a hydraulically operated switch assembly and at least one hydraulically operated on-off valve assembly. These elements are operably connected to a metered flow manifold and a plurality of distributor lines. The flow sensing valve supplies fuel to the manifold. Various flow rates of the fuel within the distributor lines causes the flow sensing valve to emit a signal. Upon receipt of this signal the switch assembly transmits the signal to the valves making up each valve assembly. The on-off valve assembly (assemblies) alters the flow restriction at the distributor lines in such a manner as to limit the change of pressure therein.

Abstract: A fluid cooled heat exchanger system comprising a heat exchanger, first conduit means connected to the heat exchanger, a pump for pumping a cooling fluid to the heat exchanger via the first conduit means, second conduit means for receiving fluid from the pump that is in excess of the heat exchanger requirements, and a valve which is so connected to the first and second conduit means that fluid that has passed through the heat exchanger via the first conduit means mixes in the valve with fluid that has by-passed the heat exchanger via the second conduit means, and the valve having a movable valve element which is moved off a valve seat by an amount dependent upon the flow of fluid in the second conduit means whereby the flow of fluid through the heat exchanger is maintained substantially constant.

Abstract: A control system and a method for regulating the division of a single feed stream between two or more pieces of processing equipment operated in parallel. The feed stream enters a three-way valve and is then equally divided into two smaller streams which flow through separate pieces of process equipment and then through separate check valves. The pressure of each of the smaller streams is monitored to detect leakage in either piece of the equipment. The flow normally passing through the leaking piece of equipment is diverted to the intact piece of equipment when the leakage causes a predetermined pressure difference.

Abstract: An ion exchange apparatus having a plurality of channels or manifolds used for liquid distribution and collection purposes within an end of a container adjacent to an ion exchange resin bed can be improved by using a check valve permitting flow in one direction to all of the channels as the bed is being employed under "service" conditions to treat water and permitting flow in the opposite direction in less than all of the channels as the bed is being treated with a regenerant solution. Such use of less than all of such panels during the treatment of the bed with the regenerant solution makes it possible to achieve good distribution of a relatively small amount of the regenerant solution and to receive regeneration of the bed utilizing such a comparatively small amount of the regenerant solution.

Abstract: In a milk processing system wherein heat treated milk is initially separated into high-fat and low-fat milk and subsequently reconstituted by adding a selected proportion of high-fat milk to the low-fat milk, control means are provided for automatically controlling the proportion of high-fat milk mixed with the low-fat milk to provide a milk blend of standardized butterfat content which is then homogenized. The control means includes a photoelectric monitoring system for continuously measuring the butterfat content of a sample of the homogenized milk as the latter flows continuously through the processing system under pressure of the homogenizer in the system. The butterfat content measurement is converted to digital signals which are compared to a pre-set digital signal corresponding to a desired butterfat content level to produce a digital corrective signal which controls a digital valve regulating the proportion of high-fat milk blended with the low-fat milk in the processing system.

Abstract: Control of temperature increase (delta-T) through a reaction zone, in which both exothermic and endothermic reactions are effected, is achieved by sensing the inlet temperature of the charge stock, an intermediate temperature within the reaction zone and the outlet temperature of the effluent from the reaction zone. The inlet temperature sensor co-acts with a temperature recorder controller (TRC) having an adjustable set point, to produce a representative signal which is transmitted to flow-regulating means which adjusts the quantity of charge stock bypassing the feed heater. The difference between the inlet and intermediate temperatures, and that between the intermediate and outlet temperatures are determined to produce two delta-T signals which are transmitted to a double differential temperature recorder controller (DdTRC) which develops a signal representing the difference between the two delta-T signals, compared to a preset difference.

Abstract: Control of temperature increases (delta-T) through a reaction zone, in which both exothermic and endothermic reactions are effected, is achieved by sensing the inlet temperature of the charge stock, a highest temperature from a plurality of intermediate loci within the reaction zone and the outlet temperature of the effluent from the reaction zone. The inlet temperature sensor co-acts with a Temperature Recorder Controller (TRC), having an adjustable set point (control point), to produce a representative signal which is transmitted to flow-regulating means which adjusts the quantity of charge stock bypassing the feed heater. The difference between the inlet and intermediate temperatures, and that between the intermediate and outlet temperatures are determined to produce two delta-T signals which are transmitted to a Double differential Temperature Recorder Controller (DdTRC) which develops a signal representing the difference between the two delta-T signals compared to a preset difference.

Abstract: A high pressure fluid source is connected to a primary orifice and a valved orifice of a binarily activated pressure regulator. The primary orifice alone supplies the fluid at a pressure below the minimum desired, and both orifices together supply the fluid at a pressure greater than the maximum desired. A sensor at the output is adjusted to open the binary valve when the minimum pressure is reached, and close the valve when the maximum pressure is reached, thus cycling between the two conditions.

Abstract: A safety valve for use in a compressed air line having a supply valve and a control valve, to prevent inadvertent sudden shifting of the controlled part when the line is exhausted and later repressurized. The safety valve comprises a normally closed piston-operated poppet valve, the piston chamber and outlet port being connected to the supply port through a bypass with an adjustable restriction upstream of the valve member. In one embodiment, the adjustable restriction comprises a replaceable plug threaded in the valve body. In a second version, the adjustable restriction comprises a needle valve mounted in a housing cover.

Abstract: A pollution control device for an internal combustion engine that provides the combined functions of metering the flow of gases from the crank case ventilation system to the engine induction system, providing at preselected times a vacuum control signal to the vacuum advance circuit of the distributor and providing a vacuum control signal to the exhaust gas recirculation valve of the engine. These three functions are provided by a single valve member the position of which is controlled by the induction system vacuum. A separator is provided between the valve and the discharge end of the crank case ventilation system to remove carbon and other particles and to condense a substantial portion of the oil vapors before these undesirable components are transmitted to the valve.

Abstract: A brake pressure distribution valve distributes fluid pressure to front brakes in proportion to fluid pressure distributed to rear brakes, and in addition, "holds off" the pressure distribution to the front brakes for delayed distribution thereto. The valve includes a housing having a cavity formed therein. Inlet and outlet ports permit fluid to flow into and out of the cavity. A first piston engages a metering seal to normally close one fluid passage and to cut off fluid communication between inlet and outlet ports. Another fluid passage is normally open to establish fluid communication between the inlet and outlet ports. Due to a fluid pressure buildup, a closing member is actuated to close the other passage thus holding off pressure distribution to the front brakes. As the fluid pressure buildup continues the one passage opens to re-establish fluid communication between the inlet and outlet ports.

Abstract: A concentrating vortex shaker for the simultaneous shaking and concentration of a multiplicity of liquid samples comprises a heat-conductive block having a plurality of openings for receiving laboratory vessels containing sample liquids and removably mounted on a base provided with an adjustable eccentric drive for displacing the block in a gyrating motion. An airtight cover is removably mounted on the block and forms a chamber above the samples which can be controllably evacuated. The samples can be heated or cooled by a temperature-controlled liquid which is fed through a channel formed in the block or heated by an adjustable electrical heater provided in the block mounting or cooled by a cooling plate, upon which the block mounts.

Abstract: In order to automatically switch an open circuit type hydraulic actuating circuit to the meter-in flow control system when the direction of the load is positive or to the meter-out control system when the direction of the load is negative or is reversed to negative, thereby controlling the speed of the load, there is provided a hydraulic actuating system in which an amplifier valve assembly of the type which may produce a main flow whose flow rate is amplified with respect to that of a pilot flow in proportion to the ratio of the opening area of a detector orifice inserted in a pilot flow passage to the opening area of a main orifice inserted in a main flow passage, is hydraulically and operatively combined with a meter-in flow control valve for controlling the flow rate of the pilot supply flow in the amplifier valve assembly, a meter-out flow control valve for controlling the flow rate of the pilot return flow, and a switching valve inserted between the pilot supply and return flow passages and adapted to b

Abstract: In a fluid spring arrangement for a metal forming die assembly of the gas-operated, piston-cylinder type, the surfaces of the piston and cylinder which are in sliding contact are lubricated by lubricant entrained in the pressurized gas directed into the working chamber of the cylinder. The lubricant is contained in an apertured cartridge within the cylinder through which the gas is constrained to flow. A valve plate cooperates with an apertured wall of the cartridge to entrain lubricant in the gas when the flow of gas is into the cylinder and prevent the entrainment of lubricant when the flow of gas is out of the working chamber of the cylinder.

Abstract: An acceleration/deceleration device which, in order to achieve shockless acceleration/deceleration control in starting or stopping of the load by means of a hydraulic actuating circuit of the open circuit type, uses an amplification valve of a type such that the main flow rate may be amplified in proportion to the area ratio between a detection orifice installed in a pilot flow passage and a main orifice installed in the main flow passage and is constructed by combining the said amplification valve with a flow rate control valve for controlling the pilot flow and a control circuit for gradually changing the area of the opening of the main orifice.

Abstract: A valve to shut off leakage from a damaged section of a pneumatic braking system: the valve comprises a spring biased movable shutter which is spring biased against a fixedly positioned annular seat and a second annular seat coaxial with the first annular seat; the second annular seat is spring biased to move a controlled maximum distance toward the shutter; a plenum defined between the first and second seats and the shutter; a small flow rate leakage passage from the high pressure concuit into the plenum. Pneumatic pressure enters the plenum and raises the shutter off the fixed valve seat while the movable valve seat follows the motion of the shutter and finally the shutter lifts off the movable valve seat, also; upon leakage, the shutter re-engages the movable and then the fixed valve seats. A valving assembly including the aforesaid valve plus other valves in the passages leading to the aforesaid valve, and each of these valves servicing a unit of the braking system.

Abstract: Liquid effluent from a sewage treatment plant is injected into a disposal well by gravity feed, and alternatively by pressurized feed when the effluent load becomes too great for the gravity feed to handle, or when the gravity feed is slowed by the presence of solids in the effluent. The disposal well is reverse purged when necessary to remove obstructing solids.

Abstract: An auxiliary manual control device for cells of a pneumatic system comprises an intermediary casing connecting each cell to a baseplate on which the said casing is normally secured. The casing is provided with piping for directly connecting the orifices of permanent pressure supply and input signals, and an OR gate with two inputs, whose output is connected to the output orifice of the baseplate, one of the inputs of the gate being directly connected to the output orifice of the cell, whereas the other input of the gate is connected by a monostable manual operated pneumatic reverser either to the exhaust, which represents its rest position, or to the pipe of permanent pressure supply.

Abstract: Apparatus for use in a vehicle having a hydraulically actuated steering mechanism and a hydraulically actuated implement. The apparatus comprises a housing, which includes a fluid inlet port, first and second working ports, for connection with the steering mechanism, a fluid return port and an auxiliary port for connection with the implement. A metering mechanism is located in the housing, and a first valve is movably located within said housing. The first valve has a neutral position communicating the inlet with said auxiliary port and blocking the inlet from said first and second working ports. The valve also has first and second actuated positions communicating said inlet port with said metering unit and communicating flow from the metering unit to said first or second working ports respectively.

Abstract: A well point system is provided having automatic regulation of the flow of fluid through each riser in order to shut off an individual riser when the water level drops below the well point of that particular riser. The automatic regulation in the flow of water is controlled above the surface of the earth and includes a float actuated valve for preventing the pump from drawing air. The float actuated valve has a float connected to a rocker arm operating two valve seats for closing a pair of ports and also has a controlled air bleed for evacuating the riser and allowing the water to unseat the valve when the water rises around the well point.

Abstract: A high pressure fluid delivery system is disclosed in which two or more dump guns, each having a high pressure nozzle outlet and a low pressure dump outlet, may be connected to and operated from a single high pressure pump. Pressure responsive flow control apparatus is provided in the flow line between each gun and the pump to maintain a substantially constant load on the pump even though the dump guns are randomly operated. A motor control apparatus is also provided for controlling the speed of an engine driving the pump and this apparatus is connected to the pressure responsive control apparatus through a shuttle valve so that the engine idles when all of the guns are dumping, but automatically runs at a faster speed when one or more of the dump guns is actuated to provide a high pressure fluid blast.

Abstract: A plurality of individually actuatable, value weighted digital bistable valve elements in parallel interconnect a fluid source to a fluid receiver. A linear relationship is preferably maintained between the resultant fluid flow rate from the source to the receiver and the product of a flow rate determinative fluid parameter times the sum of the weighted values of the digital valve elements in the open state. The fluid parameter is sensed, the states of the digital valve elements are controlled, and a flow rate representative signal is derived from the states of the valve elements and the fluid parameter. If the fluid is liquid, the parameter is the square root of the pressure difference across the valve elements, in the absence of cavitating venturis, and is the square root of the difference between the upstream pressure and the vapor pressure of the liquid in the presence of cavitating venturis. If the fluid is gas, the parameter is the source pressure divided by the square root of the source temperature.

Abstract: A safety valve for use in a compressed air line having a supply valve and a control valve, to prevent inadvertent sudden shifting of the controlled part when the line is exhausted and later repressurized. The safety valve comprises a normally closed piston-operated poppet valve, the piston chamber and outlet port being connected to the supply port through a bypass with an adjustable restriction upstream of the valve member. In one embodiment, the adjustable restriction comprises a replaceable plug threaded in the valve body. In a second version, the adjustable restriction comprises a needle valve mounted in a housing cover.