Abstract: Disclosed is an in-service test valve and system. The in-service test valve includes a body having a first chamber with a relatively small diameter bore and second chamber axially spaced apart from the first chamber and having a relatively large diameter bore. An imperforate shuttle is slidingly mounted in the valve body and includes a first piston slidingly sealingly mounted in the first chamber bore and a second piston slidingly sealingly mounted in the second chamber bore. An in-service inlet is provided in the valve body for introducing in-service pressure into the first chamber to apply sensing pressure to the first piston and urge the shuttle toward the second chamber. A test inlet is provided for introducing test pressure into the second chamber to apply test pressure to the second piston to urge the shuttle in the direction of the first chamber.

Abstract: A pressure regulator for a pump aspirating a working fluid from a tank comprises a throttle valve at a junction between an inlet pipe extending from the tank and an outlet pipe terminating at the intake port of the pump. The discharge port of the pump is connected to a control port of the regulator housing in line with the inlet pipe, this control port being separated by a partition with a narrow passage from a chamber containing the shiftable valve body. The passage accommodates a small-diameter rod which has a flat tail penetrating that passage only when the discharge pressure of the pump has reached a certain threshold above a point at which that pressure has caused the rod to move the valve body into a blocking position against a countervailing spring pressure. This establishes a connection between the discharge and intake ports of the pump preventing further rises in the pump's delivery pressure.

Abstract: A shuttle valve assembly formed with a body having a plurality of nesting housings, an outlet end housing with a fluid signal outlet and a closed end housing. These housings have an aligned axial passageway containing a plurality of tubular spool valve members which are adapted to move axially between opened and closed positions therein individually and in a nested arrangement. Each of the housings has an inlet signal port in communication with the passageway. The nested valve members are moved toward the closed end housing by a primary fluid signal applied to the inlet port on the closed end housing with the primary signal passing to the outlet. A superior fluid signal applied to the inlet port of one of the nested housings, causes the valve member closer to the closed end housing to separate from the remaining nested valve members. As a result this superior signal appears at the outlet.

Abstract: A three-way valve comprises a control mechanism which is disposed within a valve main body. The control mechanism is provided for bringing a first main valve in contact with a first valve seat of the valve main body and simultaneously separating a second main valve by a great distance from a second valve seat of the valve main body when the pressure of a first valve chamber is higher than a pressure of a second valve chamber, thereby communicating a second inlet port with an outlet port. Otherwise, the control mechanism is provided for bringing a second main valve in contact with the second valve seat and simultaneously separating the first main valve by a great distance from the first valve seat when the pressure of the second valve chamber is higher than the pressure of the first valve chamber, thereby communicating a first inlet port with the outlet port.

Abstract: A maximum pressure selector device in which a valve ball is pressure actuatable in a chamber intermediate two cooperating valve seats of opposing input chambers. Positioned between the seats is a pair of orifices which connect the intermediate chamber to an output port. The orifices are of a predetermined size for allowing a predetermined maximum fluid flow rate therethrough for reducing surge flow. The valve ball is positioned in an encircling sealing arrangement centrally located in the intermediate chamber and is restricted to limited movement therein. The input chambers communicate with the intermediate chamber and thus with the output port, depending on the seating position of the valving element.

Abstract: A diver's demand valve has a diaphragm 15 with a centrally located rigid element 16 which pivots with a lever effect on an eccentric port 22 upon establishing an operative pressure difference across the diaphragm to open and close the valve. An abutment surface 30 prevents unwanted pivoting and a spring 27 keeps the rigid element 16 seated except during operative pressure differences.For a diver's exhalation demand valve an "anti-squeeze", safety, flap valve 34 may be provided in the rigid element 16.

Abstract: A single line, pressure-pressure, pneumatic tube system having a pair of terminals each being capable of dispatching or receiving carriers. Each terminal provided with a blower to provide air flow, tubing connecting the two terminals, a pair of inline valves in the tubing, one facing in one direction and the other in the opposite direction. The valves being so designed that the one near the dispatching terminal automatically closes to permit build up of pressure and the one near the receiving terminal opens to exhaust pressure and slow the travel of the carrier as it approaches the receiving terminal, the terminal having a bleed-off orifice to assure carrier arrival.

Abstract: Pneumatic valve construction comprising a valve chamber having opposing inlet ports with opposing axially located valve seats, and a ball therebetween constructed and arranged to move off of one valve seat into engagement with the other valve seat upon an unbalance in pressure. The construction includes a bottom outlet port that extends to the top of another larger cylindrical chamber having an elastomeric piston therein with fluid flow clearance between the piston and the side walls of the chamber. A tubular exhaust port extends axially inwardly from the bottom side of the chamber to abut the bottom side of the rubber piston. An annular fluid flow chamber exists between the tubular exhaust seat and the side walls of the cylindrical chamber to allow flow past the piston through the space to a delivery port.

Abstract: A change-over valve device having a pair of oppositely disposed control pressure chambers subject to respective control pressures from two independent pressure input systems and operable for diverting the lower control pressure to a delivery chamber so as to increase the degree of the pressure normally delivered from the delivery chamber by an amount corresponding to the degree of such lower control pressure.

Abstract: A compound check valve device comprising a housing having a pair of oppositely disposed inlet ports and an outlet port therebetween, a hollow, two-part valve carrier reciprocably operable in the housing between the inlet ports for selectively communicating the inlet ports, singly or concurrently, to the outlet port, and a spring disposed between the two parts of the valve carrier for biasing respective valves mounted on the valve carrier toward respective valve seats surrounding the two inlet ports so that, in the absence of pressure at the inlet ports, the valve carrier assumes a neutral position in which the inlet ports are cut off from the outlet port, and when pressure is supplied to the inlet ports, the valve carrier assumes a position according to the relative pressures at the inlet ports to communicate either both inlet ports or one inlet port to the outlet port.

Abstract: An air deflection duct assembly is disclosed for use in adding an evaporative cooler unit to an existing refrigeration air conditioning duct to increase the efficiency of operation of the evaporative cooler by causing a higher percentage of the air flow from the cooler to pass into and through the existing refrigeration ducts. To accomplish this, first and second spaced apart duct assemblies are mounted over holes cut into the existing refrigeration air conditioning duct system. Each duct assembly has an adapter plate constructed with a circular hole in it, and this hole is normally closed by a pressure-opened deflector hinged at one edge of the hole. The hinged edges of the deflectors are mounted facing one another. When air is passed into the collar of the assembly extending upward from the hole from the evaporative cooler, the deflector plates open and extend at an angle into the existing refrigeration duct to deflect the air in opposite directions from the space between the openings cut in the duct.

Abstract: A diaphragm type valve device comprising a housing having a pair of valve chambers separated by a diaphragm piston and connected to respective fluid pressure input ports, oppositely disposed valve seats fixed in the housing in facing relation to each side of the diaphragm piston and connected to respective output ports, a pair of valve members reciprocably disposed in a central bore in the diaphragm piston and being axially biased in opposite directions by a spring compressibly installed in the central bore between the valve members, one or the other of the valve members being seatable on one or the other of the valve seats when the diaphragm piston is axially displaced by dominating pressure acting on one or the other side thereof, and stop rings concentrically fixed in the central bore adjacent the respective ends thereof for limiting axial displacement of said valve members by the spring to a spaced-apart distance somewhat greater than the fixed axial distance between the valve seats.

Abstract: A rotary fluid pressure device is disclosed of the type including a valve housing (19) defining a pair of fluid ports (41,43) and a shuttle port (85). The device includes a fluid pressure actuated displacement mechanism (15), and a rotatable valve member (53) which provides fluid communication from one of the ports to expanding volume chambers (27) of the displacement mechanism, and from the contracting volume chambers to the other fluid port. The device includes a shuttle valve assembly including a shuttle piston (97) having end portions (103,105) disposed within a pair of fluid chambers (77,79). A dampening sleeve (115,121) is disposed about each end portion of the piston and cooperates therewith to define a dampening orifice (127,129) to prevent hunting during low pressure operation.

Abstract: A single line, pressure-pressure, pneumatic tube system having a pair of terminals each being capable of dispatching or receiving carriers. Each terminal provided with a blower to provide air flow, tubing connecting the two terminals, a pair of inline valves in the tubing, one facing in one direction and the other in the opposite direction. The valves being so designed that the one near the dispatching terminal automatically closes to permit build up of pressure and the one near the receiving terminal opens to exhaust pressure and slow the travel of the carrier as it approaches the receiving terminal, the terminal having a bleed-off orifice to assure carrier arrival.

Abstract: The invention relates to the application of powder coatings to vital components of equipment in various industries. The apparatus comprises a barrel for application of powder to the article and a gas distribution unit which connects fuel gas feeding passages and a purging gas feeding passage to the barrel. Gases are fed to outlet pipes of gas passages from appropriate gas sources under pressure through valves mounted in the pipes. The outlet opening of the purging gas passage may, in some embodiments, be located upstream of the zone of admission of fuel gases to the barrel in the path of flow of purging gas. The pressure of the purging gas source exceeds the pressure of each of the fuel gas sources so that, upon feeding fuel gas to the barrel, the valves mounted at the outlet pipes of the fuel gas passages shut-off these pipes. After the valve mounted in the purging gas passage is closed, the valves mounted in the fuel pipes admit fuel gases to the barrel to build-up a detonation wave.

Abstract: A gas damper for regulating the mass flow of a stream of purging air as it is directed into an electrostatic precipitator including a generally cylindrical housing having a floating piston positioned in metering relationship to the discharge outlet of the housing by the buoyant force of the air flowing through the housing.

Abstract: A valve sub-assembly as illustrated by the drawing insertable at a "T" connection in a preformed channel so as to form a multiport valve at the site. The valve subassembly is characterized by a cage structure containing spaced apart tied together wafers with valve seats and sealing elements thereon, and a shuttle with valve face ends thereon caged between the wafers, the shuttle riding from one wafer to the other wafer. The channel wall portion sealed between wafers is converted into a valve body.The valve sub-assembly includes a face plate attached to the cage structure and spaced apart from the cage structure, so as to site the cage structure in the preformed channel at the "T" connection, the face plate being adapted to seal the channel opening to an outside wall through which the valve sub-assembly is inserted.

Abstract: A mobile cleaning unit for providing a high pressure cleaning spray, comprising a van-type vehicle with separate sources of water and cleaning and treating solutions. Valves, one associated with each source, determine the composition of the cleaning spray by individually controlling both the introduction and the proportion of cleaning or treating solution introduced into the water as it is used in cleaning. The individual valves are successively operated in response to each initiation of flow from the source of water. The cleaning or treating solution from a particular source to be used is selected by starting and stopping flow from the source of water by operation of a flow control valve at the spray applicator.

Abstract: A cross-flow controlling valve for a hydropneumatic vehicle suspension has a casing formed with three ports of which two communicate with longitudinally terminal portions of a bore in the casing. A piston is freely slidable in the bore between two terminal positions. Longitudinally spaced shoulder portions of the bore bound a transversely open, longitudinal groove in the piston which is longer than the intermediate portion of the casing bore connecting the terminal bore portions. Each shoulder portion is dimensioned to bound a throttling gap connecting the groove with one of the terminal bore portions when the shoulder portion is received in the intermediate bore portion. The groove in the piston permanently communicates with the third casing port.

Abstract: Liquid level in tanks is gauged an can be controlled as follows. Liquid communication is provided from near the bottom of the tank to a liquid reservoir containing a liquid which is of different density and immiscible with the tank liquid. The reservoir is in liquid communication with a vertically elongated vessel having a relatively small horizontal area compared to the tank, communication being near the top of the reservoir if the reservoir liquid is less dense than the tank liquid and being near the bottom of the reservoir if the reservoir liquid is more dense than the tank liquid. The elongated vessel, which can be transparent or translucent so that the liquid level therein corresponding to the liquid level in the tank can be readily determined, can contain a float containing a proximity sensor triggering element.

Abstract: A shuttle valve includes a tubular body having two, coaxial, inlet ports at its ends, and a transverse outlet port at its side. An internally threaded connector ring is secured over each port by cap screws.A cage having an external radial flange is telescopically disposed within each inlet port, with its flange clamped between the adjacent connector ring and an outwardly facing shoulder in the body. O-rings seal the three connector rings and the two cages to the body. Each cage has an inwardly protuberant O-ring secured at its outer end providing a valve seat. Inwardly of the seat each cage is axially grooved, providing flow passages. The ribs left between the grooves provide guide bearings. Adjacent the inner end of each cage are formed stop shoulders. Inwardly of the stop shoulders is a skirt or lip forming a dashpot cylinder.

Abstract: PCT No. PCT/US79/00968 Sec. 371 Date Nov. 8, 1979 Sec. 102(e) Date Nov. 8, 1979, PCT Filed Nov. 8, 1979An improved load resolver (41) is provided of the type which receives a pair of generally unequal pressure signals (32, 34), and which resolves the pair of pressure signals (32, 34) by blocking the lesser and transmitting the greater. Each pressure signal (32, 34) is sent to the load resolver (41) by a respective control valve (18, 20) in a hydraulic system (10). Prior load resolver structures have required angled or intersecting holes therein or special porting therearound. The improved load resolver (41) comprises a first member (58) having a first, axially extending hole (64) and a second member (72) having second and third axially extending holes (78, 104). The members (58, 72) are fitted within a bore (48) of a control valve body (19).

Abstract: An improvement in a heating and air conditioning system for a mobile home or the like including a system of air ducts for distributing the air within the mobile home, a heating unit, a cooling unit; and characterized by a plenum chamber that includes respective connected hot and cold air inlet apertures and valve seats, and at least one outlet opening connected with the air ducts; and a large hollow lightweight poppet disposed intermediate the hot and cold air valve seats. The large hollow poppet is moveable responsive to respective directions of air flow to and away from the hot and cold air valve seats so as to permit flow from one of the heating and cooling units and to block reverse flow into the other. Also provided are guide means for freely and accurately guiding the hollow poppet between its respective seating engagement positions.

Abstract: The invention relates to the application of powder coatings to vital components of equipment in various industries. The apparatus comprises a barrel for application of powder to the article and a gas distribution unit which connects fuel gas feeding passages and a purging gas feeding passage to the barrel. Gases are fed to outlet pipes of gas passages from appropriate gas sources under pressure through valves mounted in the pipes. The outlet opening of the purging gas passage may, in some embodiments be located upstream of the zone of admission of fuel gases to the barrel in the path of flow of purging gas. The pressure of the purging gas source exceeds the pressure of each of the fuel gas sources so that, upon feeding fuel gas to the barrel, the valves mounted at the outlet pipes of the fuel gas passages shut-off these pipes. After the valve mounted in the purging gas passage is closed, the valves mounted in the fuel pipes admit fuel gases to the barrel to build-up a detonation wave.

Abstract: A mobile cleaning unit for providing a high pressure cleaning spray, comprising a van-type vehicle with separate sources of water and cleaning and treating solutions. Valves, one associated with each source, determine the composition of the cleaning spray by individually controlling both the introduction and the proportion of cleaning or treating solution introduced into the water as it is used in cleaning. The individual valves are successively operated in response to each initiation of flow from the source of water. The cleaning or treating solution from a particular source to be used is selected by starting and stopping flow from the source of water by operation of a flow control valve at the spray applicator.

Abstract: A polarity control valve enables the undiscriminating interconnection of a pressure line and a return line to two available ports to provide fluid pressure at an output line and a return connection through a return port. This feature of interconnecting either the pressure line or the return line to any of the two available ports is achieved by a pressure positionable spool mounted in a ported sleeve. The spool is positionable between one of two positions depending upon which port is connected to the pressure line. By controlling the distribution of lands on the spool the position thereof always establishes a fluid path from the pressure line to an output port connected to a fluid pressure responsive component. Fluid returning from the component is likewise directed by means of the positionable spool to the return line.

Abstract: An annular chamber in a housing has inlets at both ends. A central segment of the changer has on its inside wall a groove tapering toward the inside and leading at its base to a centrally located output passageway. Disposed in the groove and central segment of the chamber is an annular gate ring which has a T-shaped radial cross-section. There is sufficient clearance between the ring and the walls to permit the ring to move freely a short distance axially within its confinement. Pressure from one or the other direction of the chamber causes the ring to deform itself against one or the other side of the groove so that the top part of the T-shaped radial cross-section closes off the chamber to the other side.

Abstract: An improved shuttle valve for providing control of fluid from two alternate ources to a fluid-actuated mechanism. Primary and secondary fluid sources are coupled to supply fluid to a shuttle valve for transmission to a single outlet port. A bias piston having a passage axially extending therethrough is slidably positioned to engage the shuttle and impart movement in response to fluid pressure from the primary source. A bias source is coupled to vary the pressure on the piston and thus change the net bias needed to allow fluid from the primary source to maintain the shuttle in a first position. Initially, when the shuttle is in the first position, fluid flows from the primary source to the single outlet. Subsequently, when the pressure from the primary source falls below a predetermined value, the fluid pressure from the secondary source moves the shuttle to enable fluid flow from the secondary source to the single outlet.

Abstract: A two-axle, four-wheel-drive vehicle has separate hydraulic drive systems to drive the front and rear pairs of traction wheels. Each drive system includes a hydraulic motor that is powered by its own variable displacement pump. The torque developed by the motors, and the hydrostatic drive pressure, depend on the volume of fluid flow from the pumps. Under certain conditions, the hydrostatic drive pressure to the two motors becomes unbalanced. A torque equalizer valve is interconnected between the two hydraulic drive systems. When the equalizer valve senses a hydrostatic drive pressure difference between the two drive systems, it readjusts the displacement of the pump having the higher pressure by lowering the hydrostatic pilot pressure to restore the balance of hydrostatic drive pressures.

Abstract: A pneumatic logic control module is disclosed which includes three miniaturized, piloted, detented relay valves mounted on a pneumatic circuit board including a valve mounting plate, a circuit plate having routed flow paths formed in each face, and a connector plate having barbed ports for receiving flexible tubes. The pneumatic circuit interconnects the relay valves so that the relay valves are shifted from a normal position to an active position and locks to the normal position in a predetermined sequence to produce a series of pneumatic pressure signals. The module produces a first pneumatic pressure signal in response to a start signal which is used to initiate a first event. A return verification signal indicating that the first event has been completed terminates the first pressure signal, and initiates a second pressure signal which starts a second event.

Abstract: A system for distributing a piped fluid uses a plurality of valves arranged along a fluid conduit. The valves are successively opened for a selected period of time by a plug element inserted in the conduit and carried by the fluid. The plug element engages the valves and opens each valve in response to fluid pressure. In a preferred embodiment, the plug element upon completion of a circuit through the conduit automatically reverses the direction of fluid flow. There is also disclosed a sprinkler head for use in connection with the distribution system.

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: An emergency hydraulic ram valve actuator having redundant power sources and controls. At least two pressure fluid sources, such as hydraulic accumulators, are connected through separate controls to the cylinder head. Check valves in the cylinder head and base prevent outward flow to insure containment of the fluid even when dismantled for service. Both sets of controls are contained in manifolds connected between the pressure sources and pressure and exhaust lines to and from the cylinder. Flow from each accumulator is normally prevented by a pilot check valve, but selectively operated valves initiate flow which, in turn, biases the pilot check valves to full flow. As full flow commences a portion thereof is diverted to open the exhaust pilot check valves which allow cylinder evacuation. In the event one power and/or control system is disabled, the other will function independently. The pressure and exhaust lines are contained within protective shields throughout their lengths.

Abstract: A pair of pressure sensing probe tubes are placed in the fan discharge of a turbofan engine, aft of the outlet guide vanes (OGVs) the tubes being circumferentially spaced by a fraction of the OGV pitch. A comparing means receives both pressures sensed by the double-barrelled probes and aerodynamically actuates to automatically select the higher of the two pressures. An accurate pressure indication representative of the mainstream pressure is therefore obtained despite the localized lower pressure turbulence area that may be caused by the presence of the upstream outlet guide vane(s).

Abstract: The pneumatic logic circuit is of generally symmetrical structure around an axis and symmetrical with respect to a median plane normal to this axis. It has a median plate provided with an axial passage and with a duct opening into this passage. On each side of the median plane is a diaphragm constituted by a flat sheet of rubber or of synthetic elastomer with, on its outer surface, a centering shoulder and with an axial cylindrical passage. It comprises axially a piston rod, passing freely through said passage of the median plate and with fluid-tightness through said passages of the diaphragm and bearing two pistons.

Abstract: A hydraulic system including a source of pressurized fluid, a plurality of hydraulic motors with a plurality of control valves for directing fluid from the source to the motors, a dual-stage relief valve for the system for normally establishing a first pressure for part of the system for some of the motors and a second pressure for part of the system for the remainder of the motors and responsive to at least a pair of the control valves of the system for establishing the higher pressure includes a balanced resolver valve disposed between the pair of directional control valves and the relief valve and operative to prevent simultaneous communication of the pair of valves with the relief valve.

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: An automatic closure valve for water sprinkler which enables water from a water tap to be used without even necessity for stopping the tap and removing the sprinkler and water hose and enables water remaining in the hose and the closure valve to be automatically drained off after the water sprinkling, the closure valve being constructed with a valve casing, in which there are provided two valve chambers defined in mutual contiguity and communicated each other by means of a passage; a closure valve mechanism for closing the passage in response to increased pressure of water in the valve chambers; an opening which communicates the valve chambers and the external atmosphere; and a valve means which usually closes the opening by the water pressure, and opens the same when the pressure in the valve chambers becomes negative.

Abstract: A two-way valve operated by a pressure differential existing in the fluid lines controlled by the valve for use in swimming and therapeutic pool systems.

Abstract: A shuttle valve comprising a body having a longitudinal bore and coaxial first and second counterbores, a sleeve having a first portion press fitted into one of the counterbores and a second portion having a slip fit in the other counterbore. The sleeve has a bore therethrough and there is a valve element movable within the smaller counterbore for alternately opening and closing the body bore and the sleeve bore with respect to a transverse port that intersects the smaller counterbore. The sleeve has a tapered surface where it is press fitted into the smaller counterbore and the sleeve has a tapered shoulder that engages a tapered shoulder between the two counterbores to seal the sleeve within the body.

Abstract: A priority valve that connects either of two inlet ports, whichever has the highest fluid pressure therein, with an outlet port. The valve includes a flexible diaphragm that carries a valve element alternately engageable with a pair of valve seats for controlling the flow of fluid between the inlet ports and the outlet port.

Abstract: A railroad car maximum speed limiting device including a railroad car wheel-driven generator and centrifugal speed responsive switch for operating a solenoid valve to supply vacuum to the vehicle brakes from an auxiliary vacuum reservoir after the vehicle has passed a magnetic trip operating a relay to complete the genertor circuit, the improvement comprising an air cylinder operated by trainline vacuum for moving the generator and centrifugal speed responsive switch wheel out of engagement with the car wheel for trainline operation, and a special shuttle valve on the cylinder for supplying braking vacuum to the cylinder alternately from the speed control auxiliary vacuum reservoir or from the main conventional vacuum reservoir.