Abstract: A membrane arrangement to be placed between a product chamber and a hydraulic oil chamber is provided. The membrane arrangement comprises a first membrane and a second membrane. Between the membranes in a membrane interior space a marker liquid is placed. By using a sensor it can be detected when product or hydraulic oil enters the membrane interior space, which in turn means that a rupture of any of the two membranes may be detected in a reliable and cost efficient way.

Abstract: A pressure transfer device comprises a hydraulic path, which is formed by a duct, which extends through a solid body arrangement from a pressure source to a pressure sink, wherein the pressure source comprises a separating diaphragm chamber, which communicates with the duct, and which is sealed with a flexible isolating diaphragm, wherein the isolating diaphragm is contactable with a pressure to be transferred, wherein the pressure sink comprises a sealed sink chamber, which communicates with the duct, wherein the separating diaphragm chamber, the duct and the pressure sink chamber are filled with a pressure transfer liquid, wherein the pressure transfer liquid has according to the invention a magnetically changeable viscosity, and wherein the pressure transfer means further comprises in at least one section of the hydraulic path at least one magnet for influencing the viscosity of the pressure transfer liquid.

Abstract: A sanitary diaphragm valve has a valve body formed of an upper plate and a lower plate, with a flexible resilient diaphragm and a spacer between them. The margin of the diaphragm rests on a peripheral step formed in the lower plate to create a positive space between the lower plate and the edges of the diaphragm. A piston within a cylinder in the upper plate can descend to compress the diaphragm against a valve port to close the valve. The pressure of the liquid product can raise the diaphragm and the piston when control pressure is relieved from the piston.

Abstract: One embodiment of the present invention is a mounting apparatus that includes: (a) a first ring having a first surface and a second surface; (b) a second ring having a first surface and a second surface, which second ring is movable with respect to the first ring; (c) a first flexible diaphragm attached to: (i) the first surface of the first ring along a first-surface-first-ring attachment perimeter that encloses a first effective surface area, and (ii) the first surface of the second ring along a first-surface-second-ring attachment perimeter; and (d) a second flexible diaphragm attached to: (i) the second surface of the first ring along a second-surface-first-ring attachment perimeter that encloses a second effective surface area, and (ii) the second surface of the second ring at a second-surface-second-ring attachment perimeter; wherein: the first and second flexible diaphragms and the first and second rings form a chamber with one or more intake apertures.

Abstract: A diaphragm pump for pumping a fluid includes a housing, a pump chamber defined in the housing, a first diaphragm for sealing the pump chamber, a pressure control chamber defined in the housing adjacent to the pump chamber via the first diaphragm, a second diaphragm for sealing the pressure control chamber, a drive mechanism operable to deform the first and second diaphragms, an introduction passage for introducing into the pressure control chamber a part of the fluid that is discharged from the pump chamber, and a pressure regulating valve disposed in the introduction passage for adjusting a pressure in the pressure control chamber to a medium pressure between a suction pressure and a discharge pressure.

Abstract: A reciprocating body 12 is reciprocably housed in a cylinder body 6, and a pressure rod 20 is reciprocably attached to this reciprocating body 12. A pressure end 20a of the pressure rod 20 protrudes from the cylinder body 12 toward the outside. By the reciprocating body 12 and diaphragms 17 to 19, an advance pressure chamber 27 and a weight offset pressure chamber 29 are partitioned and formed in the cylinder body 6. After the pressure end 20a is disposed vertically downwardly, the weight offset pressure chamber 29 is filled with compressed fluid, whereby self weight of the reciprocating body 12 and the pressure rod 20 is offset. Then, the compressed fluid is supplied to the advance pressure chamber 27, and an object to be pressurized W is pressurized through the pressure rod 20.

Abstract: A multistep diaphragm pump comprising: a pump body; a main shaft; a reciprocated driving mechanism driven by the main shaft; a driving shaft connected with the reciprocated driving mechanism and extended into the working chamber of the pump body; on the relevant driving shaft there is provide a plurality of dish type diaphragms which are connected in series; in front of each dish type diaphragm there is fixed a piston having a sealing ring; between the adjacent two dish type diaphragms is filled with hydraulic medium, wherein the piston situated in the front of the most front dish type diaphragm directly contacts with the liquid material in the working chamber, a suction check valve and a discharge check valve are provided in the working chamber; the driving mechanism is constituted by the main shaft, the eccentric shaft, the driving plate, the articulated bearings and the bridge board, therefore the driving shaft can be moved reciprocally.

Abstract: There are provided a flow control valve and a flow control device suitable for allowing flow control of a fluid with high accuracy. Diaphragms 8 and 9 are mounted to upper and lower openings, respectively, of an air chamber 6. The upper diaphragm 8 and the lower diaphragm 9 are connected by a connecting shaft 10 and have pressurized surfaces with different areas that receive pressure of the air chamber 6. This causes a difference between forces applied to the two diaphragms 8 and 9, and the difference causes the connecting shaft 10 and a valve body 2 mounted to an outer surface of the lower diaphragm 9 to slide and be separated from a valve seat 23.

Abstract: A centering support for a piston in a piston-type pump having a diaphragm extending between the piston and the cylinder to define a product end of the pump and a driven end of the pump includes at least three equally radially spaced, centering elements extending radially outwardly from the piston for contacting the cylinder wall. The centering elements define a gap between the piston and the cylinder wall. The centering elements are disposed on the piston spaced from the diaphragm at the product end of the pump.

Abstract: A tandem vacuum booster includes a rear housing mounted to the vehicle, and a front housing mounted to the rear housing to define an interior chamber. A divider, disposed between the housings, partitions the interior chamber into primary and secondary chambers. A primary diaphragm, disposed between the rear housing and the divider, partitions the primary chamber into a primary high pressure chamber and a vacuum chamber. A secondary diaphragm, disposed between the divider and the front housing, partitions the secondary chamber into a secondary high pressure chamber and a vacuum chamber. A tie rod extends between the housings and through the chambers. A sleeve is disposed about the tie rod and extends between the high pressure chambers and is spaced from the tie rod. This sleeve defines a passage between the tie rod and itself such that air can be transferred between the high pressure chambers.

Abstract: A multiple diaphragm actuator for exerting linear forces of precise and repeatable amounts in opposite directions with no friction and no fluid leakage.

Abstract: This invention relates to a seal between two components which two components can move relative to one another. The seal can be used in particular for hydraulic, pneumatic or hydropneumatic systems, whereby at least one elastic seal element interacts with a running surface. Preferably, this seal is used between a piston-shaped part and a cylinder-shaped part. In any case, the running surface, which running surface is mobile relative to the gasket, is provided with depressions. The depressions in the running surface, which running surface interacts with the gasket, form a cross-hatched pattern.

Abstract: An improved method and apparatus for adjusting the flow of a diaphragm pump. The thickness of the diaphragm itself is capable of being adjusted. Full stroke output is thereby reduced in inverse proportion to the increased volume occupied by the diaphragm. Adjusting the thickness of the diaphragm while the pump is operating provides a means of varying pump output without stopping the pump for adjustments or modifications.

Abstract: For a hydraulically driven diaphragm pump with a diaphragm consisting of at least two individual layers, these layers are clamped at least in their central area between a coupling part on the feed area side and the hydraulics area side and are thus mechanically linked with one another. The coupling parts are also connected with a relay valve of a leak replenishment system which is attached in the pump body in a moveable manner.

Abstract: An actuator system having a motor that drives a pneumatic spool valve to a known position based upon the number of step commands delivered to it. Valve ports or passages uncovered by the net position difference between the spool valve and a piston create gas flow to or from a control chamber. This gas flow causes a pressure differential across the face of the piston, inducing the piston to follow the spool valve. In this two-stage system, the piston acts as a force amplifier so that large forces and/or inertias may be actuated by positioning the motor. During steady state conditions, the piston achieves the same position as the spool valve is. Proportional control and very accurate positioning of the piston are provided without active position or position rate feedback control.

Abstract: An insert member for use in a flexible diaphragm portion of a pump which enables such flexible diaphragm portion of such pump to be provided with a substantially uniform non-obtrusive surface area that will be positioned in such pump for intimate contact with a material to be pumped. Such insert member includes a first disc-like portion having both a first predetermined size and a first predetermined configuration. There is also a second disc-like portion having both a second predetermined size and a second predetermined configuration. The second disc-like portion is secured adjacent one surface thereof to a first surface of the first disc-like portion and such second disc-like portion extends from the first surface of such first disc-like portion for a predetermined distance. This second disc-like portion is disposed substantially in a center portion of the first surface of such first disc-like portion.

Abstract: Inert plastic coated flexible diaphragm for sanitary pump applications includes a first body portion, disposed in center of diaphragm, which is relatively thick and exhibits a first degree of flexibility. A second body portion is formed contiguously with the first body portion and extends around periphery thereof. The second body portion is relatively thin, compared to the first body portion, and exhibits a second degree of flexibility greater than the first degree of flexibility. A sealing bead-like member is formed contiguously with such second body portion and extends around periphery thereof for sealing the flexible diaphragm in an operating position within a housing portion of such pump. A flexible plastic layer is adhered to each surface of the first body portion, the second body portion and such sealing bead-like member which will come into intimate contact with a material to be pumped. Such plastic layer having a substantially uniform thickness.

Abstract: In a diaphragm or membrane pump, the diaphragm thereof is composed of two diaphragm disks arranged at an axial distance from one another and enclosing an interior space whose size is variable given damage to one of the diaphragm disks. Further, a signal generator is arranged in that diaphragm disk facing toward the conveying chamber and a signal pick-up is arranged in the pump housing, this signal pick-up being connected to a means for the electronic evaluation and amplification of the signals output by the signal pick-up. This embodiment makes it possible to recognize a potential damage to the diaphragm early and to thus reliably prevent hydraulic medium from proceeding into the conveyed medium.

Abstract: The invention provides a brake booster including in a preferred embodiment a housing, first and second annular flexible diaphragms spaced from one another forming a sealed second chamber within the housing and a sealed first chamber between the first diaphragm and the first end of the housing, a generally annular shaped power piston for connection with the master cylinder piston, a chamber valve seat separating the first and second chambers, an inlet valve slidably mounted within the power piston, and a control valve spring biased away from the power piston and connected with the pedal linkage and being slidably and sealably mounted within first end of the housing.

Abstract: The combination diaphragm and valve body comprises a plastic vacuum booster valve body (32) which has molded integrally therewith via living hinges (34) a plurality of diaphragm arms (36). The diaphragm arms (36) may be disposed initially in a position substantially parallel to a longitudinal axis (A) of said valve body (32). The diaphragm arms (36) are pivoted to a position substantially orthogonal relative to the longitudinal axis (A) of the valve body (32) and ultrasonically welded to the valve body (32). Each of said diaphragm arms (36) includes a plurality of radial openings (38) at a radial end (39) thereof for receiving a metal connection member (40). The metal connection member (40) is snap-fitted into associated radial openings (38) in the diaphragm arms (36), and a diaphragm (50) is compression molded about the valve body (32) and over the surface of the diaphragm arms (36). The diaphragm arms (36) may be manufactured separately and then welded to the valve body (32).

Abstract: The invention provides a brake booster including in a preferred embodiment a housing, first and second annular flexible diaphragms spaced from one another forming a sealed second chamber within the housing and a sealed first chamber between the first diaphragm and the first end of the housing, a generally annular shaped power piston for connection with the master cylinder piston, a chamber valve seat separating the first and second chambers, an inlet valve slidably mounted within the power piston, and a control valve spring biased away from the power piston and connected with the pedal linkage and being slidably and sealably mounted within first end of the housing.

Abstract: A tandem diaphragm vacuum booster in which both diaphragm and the bead seals are made of a single rubber-like molding.

Abstract: A tandem diaphragm vacuum booster in which both diaphragm and the bead seals are made of a single rubber-like molding.

Abstract: A cell for sensing differential pressures has a single brittle material diaphragm mounted on support plates positioned on opposite sides of the diaphragm. The diaphragm surfaces when at zero differential pressure facing the support are concave and shaped to conform very closely to the shape the diaphragm has when it is deflected so that when the diaphragm is under a selected pressure and it is forced against one of the supports in either direction, the diaphragm is substantially planar or flat and supported fully on its support plate. The diaphragm may be shaped by placing it under a pressure so that it bows or deflects and then grinding the surface opposite from the applied pressure flat. When the pressure is removed, the diaphragm relaxes and a cavity with the exact required shape is produced on the surface that had been bowed out and ground flat. The same procedure can be done to the other side of the diaphragm or two diaphragm sections may be fixed together.

Abstract: A pressostat comprises an operating pressure chamber (4) which is limited by its housing (1) and by an operating membrane (5) or the like including a pressure surface for an output adjustment member (3), at least one spring counteracting the pressure (P) in the operating pressure chamber (4), a switch member (2) which responds when a limit pressure value is exceeded in said working pressure chamber (4), and an enclosed protective chamber (6) arranged concentrically to the working pressure chamber (4) limited by the housing (1), the operating membrane (5) and a protective membrane (7) or the like including pressure surface for the output adjustment member (3).

Abstract: Pressure fluid control valves include modular body structures made up of a plurality of end to end connected body parts which are preferably finish fabricated by injection molding of thermoplastic. An axially movable closure member is supported in coaxial bores formed in the assembled body parts and is characterized by a cylindrical plug engageable with opposed conical seat surfaces on adjacent body parts or spaced apart closure disks engageable with respective seat surfaces on a common body part to form a fluid-tight seal between inlet and exhaust ports and a working fluid transfer port, respectively. The closure plug or disks are molded of relatively soft plastic such as polyurethane and the closure plug may be molded directly on the closure member shaft. The shaft is supported by a differential area flexible rolling diaphragm or resilient sealed piston pilot actuator at one end and a mechanical actuator such as coil spring or other types of mechanism at the opposite end.

Abstract: A pressure regulator valve for use in fuel systems for internal combustion engines which includes a two-part housing lamination with a diaphragm between the bottom and top housings and a centering valve guide disc above the diaphragm. The diaphragm is responsive to fuel pressure and will open a valve to by-pass fuel to a fuel tank. The centering valve guide disc functions to locate a diaphragm backing disc above the valve seat. A preferred diaphragm is formed of thin metal such as stainless steel which is confined at its periphery by housing elements to avoid destructive deformation in maximum pressure testing. In another embodiment, the metal operating diaphragm is secured at its periphery and formed in a manner to react in response to pressure to counteract increased spring force of a diaphragm backing spring. A press-in spring cap or cup allows calibration of the unit during assembly with a strike-in to fix the calibration in a tamperproof structure.

Abstract: A pulsator for milking machines has two diaphragms connected by a rod with each diaphragm dividing a pressure chamber into a processing space and a damping space. The damping spaces communicate through a channel that is provided with a throttle. The processing spaces are connected either to a source of vacuum or to the atmosphere. A switchover is attached to the rod and connects lines leading to the pulsation spaces of milking containers either to the atmosphere or to a source of vacuum. A main line is provided with a throttle. The throttles in the communicating channel and in the main line are detoured by bypasses provided with chokes that can be vacuum-activated through control channels.

Abstract: A pressure sensor has a housing in which at least two diaphragms are secured in such a manner that they include a volume which is filled with a hydraulic fluid. The incompressible hydraulic fluid serves to transmit pressure between the diaphragms. For introducing the hydraulic fluid one diaphragm is provided with an opening. A narrow tube is connected in fluid-tight manner to the edge of the opening. The hydraulic fluid is introduced through the initially still open end of the narrow tube. After the filling with hydraulic fluid the open end of the narrow tube is sealed in fluid-tight manner, for example by squeezing. The narrow tube can serve at the same time a force-transmitting or travel-transmitting member which connects the diaphragm to a force or travel sensor.

Abstract: A pressure regulator valve for use in fuel systems for internal combustion engines which includes a two-part housing lamination with a diaphragm between the bottom and top housings and a valve back-up pad above the diaphragm. The diaphragm is responsive to fuel pressure and will open a valve to by-pass fuel to a fuel tank. A centering diaphragm functions to locate a back-up pad above the valve seat. In one embodiment, the regulator valve pad controlled by the diaphragm is dimensioned with a diameter significantly larger than the effective valve seat area to insure full valve seat opening even when the valve pad is cocked slightly relative to the valve seat area. A press-on spring cap or cup allows calibration of the unit during assembly with a strike-in to fix the calibration in a tamperproof structure.

Abstract: Pressure fluid control valves include modular body structures made up of a plurality of end to end connected body parts which are preferably finish fabricated by injection molding of thermoplastic. An axially movable closure member is supported in coaxial bores formed in the assembled body parts and is characterized by a cylindrical plug engageable with opposed conical seat surfaces on adjacent body parts or spaced apart closure disks engageable with respective seat surfaces on a common body part to form a fluid-tight seal between inlet and exhaust ports and a working fluid transfer port, respectively. The closure plug or disks are molded of relatively soft plastic such as polyurethane and the closure plug may be molded directly on the closure member shaft. The shaft is supported by a differential area flexible rolling diaphragm or resilient sealed piston pilot actuator at one end and a mechanical actuator such as coil spring or other types of mechanism at the opposite end.

Abstract: A tandem brake booster for automotive vehicles comprises a housing the interior of which is subdivided into front and rear chambers by means of a partition wall, a front movable wall assembled within the front chamber to subdivide the front chamber into front constant and variable pressure chambers and being integrally provided at its inner peripheral portion with a front cylindrical hub member extending from the front chamber into the rear chamber across the partition wall, a rear movable wall assembled within the rear chamber to subdivide the rear chamber into rear constant and variable pressure chambers and being integrally provided at its inner peripheral portion with a rear hub member. The rear hub member is engaged with the rear end of the front hub member and is formed with a cylindrical portion which extends into the front variable pressure chamber across the partition wall and is arranged in surrounding relationship with the front cylindrical hub member.

Abstract: A diaphragm pump for use for artesian bores, simple in construction and easy to maintain. The diaphragm pump has a rectangular box-like main body with a shaft having an eccentric formed on the shaft to provide the driving force for the pump. Rectangular diaphragms are provided which, together with arcuate side plates, define the respective pumping chambers of the pump. A cage configuration of a rightangular tubular construction surrounds the rectangular box-like main body. Inlet and outlet manifolds are provided with corresponding valves for entry of water into the pump and for the exit of water from the pump.

Abstract: The automatic purger has an intermediate chamber (11) one of the walls of which is formed by an elastic diaphragm (10), termed front diaphragm, whereas the other wall is formed by a second elastic diaphragm (12), termed rear diaphragm. This chamber is connected to a purger (20) formed by a body (21) defining a small internal enclosure (22) in which an element (25), which is highly permeable to the gas, is disposed. The invention is applicable to a hydraulically controlled or actuated pump of the reciprocating or displacement type.

Abstract: A diaphragm module for pneumatic control systems comprises at least a pressure comparing stage and a force/pressure transducer controlled by said stage. The design of said module comprises chambers in a housing divided by diaphragms, wherein the force transmission between the diaphragms is achieved by intermediately arranged diaphragm disks.

Abstract: A tandem diaphragm brake booster includes a housing, first and second diaphragms disposed in said housing, a partition wall disposed between said first and second diaphragms within said housing for defining four pressure chambers. The housing is composed of a cup-shaped shell section having a broad cylindrical outer wall and a flange shaped rear shell section. A bead of the first diaphragm is situated between the inner surface of the front sell section and a securing member of the partition wall for defining the first and second chambers. The second diaphragm has inner and outer beads and through-holes at its periphery. The inner bead is compressed between the peripheral edge of the partition wall and the inner surface of the rear shell section and the outer bead is air-tightly secured between both peripheral edges of the front shell section and rear shell section.

Abstract: An air-operated diaphragm pump assembly for withdrawing small volumes of liquid from a receptacle until the receptacle is almost completely emptied. The pump assembly includes a diaphragm pump that is submerged within the liquid in one receptacle, an extension sleeve extending upwardly from the pump to a position above the receptacle, fluid logic circuitry to operate the pump, inlet conduit(s) passing through the sleeve to transmit control pulses to the pump, and outlet conduit(s) passing through the sleeve to discharge the liquid forced out of the pump in response to the control pulses. The fluid logic circuitry includes a pneumatic Schmitt-Trigger that is operatively associated with a pneumatic inverter. The diaphragm pump includes a pumping diaphragm and a driving diaphragm, the diaphragms being coupled together to drive a displacer within a pumping chamber in response to a pressure differential to thereby expel the liquid contained therein.

Abstract: A brake apparatus 10 having a master cylinder 16 with a flange 24 connected to a first shell 56 of a booster 18 and a stationary firewall 71 of a vehicle. A first wall 70 located between the flange 24 and first shell is connected to a piston 38 in the master cylinder 14. A second wall 144 located between the first shell 56, flange 24 and a second shell 121 is linked to the first wall 70 by a plurality of bolts 180 that pass through the flange 24. A valve 102 in response to an input controls the development of a pressure differential across the first and second walls 70 and 144. This pressure differential creates a force such that the first wall 70 pushes piston 38 while the second wall 144 pulls the first wall 70 to pressurize fluid in the master cylinder 16. Since the flange 24 fixes the master cylinder 16 to a stationary firewall 71, measurable axial deflection is eliminated and the entire input is used to operate valve 102 and effect a brake application.

Abstract: An air conditioning control system for at least two duct sections each with an associated damper comprises at least one master controller for a first pneumatic actuator for one damper and at least one tracking controller for a second pneumatic actuator for the other damper. The master controller comprises a first flow sensor producing a first flow variable signal in response to a sensed flow in the duct section associated with the said one damper. An adjustable reference or bias signal means is provided and a temperature signal is combined therewith to provide a composite signal for comparison with the flow variable signal. A resultant signal after comparison operates the first pneuamtic actuator for the said one damper. A tracking controller comprises a second flow sensor producing a second flow variable signal in response to sensed flow in the duct section associated with the other damper.

Abstract: A disposable intravenous pump chamber cassette for an intravenous administration set which provides a fast yet fluid tight connection for a diaphragm portion to the pump chamber housing. The pump chamber is specifically constructed to be utilized in conjunction with a peristaltic-type pump having three contact members wherein the outer contact members serve as valves and the central contact member as a pumping member.

Abstract: A diaphragm pump including an eccentric circular cam or crank shaft, a connecting rod rotatably connected at one end to the eccentric circular cam or crank shaft, a pair of diaphragms each having one surface serving as pressure receiving surface, center disks mounting the central portions of the pair of diaphragms on the opposite sides thereof, a first housing cooperating with one of the diaphragms and the center disks to define a first discharge chamber, a second housing cooperating with the other of the diaphragms and the center disks to define a second discharge chamber, a third housing cooperating with the pair of diaphragms and the center disks to define a suction chamber, a connecting member connecting the other end of the connecting rod to the center disks in the radial center and in the middle of the thickness thereof in order to minimize any swinging movement of the center disks which would otherwise be caused by reciprocatory swinging movement of the connecting rod, and guide means for guiding the c

Abstract: A pump for transferring precise amounts of fluid from a container to a patient. A pump apparatus has a defined volume pump chamber divided by a diaphragm into a pumping fluid portion and a pumped fluid portion. The pumped fluid portion receives and exhausts pumped fluid in response to a decrease or increase in pressure in the pumping fluid portion of the pump chamber. The diaphragm and the defined volume pumping chamber provide accurate per cycle pumping volumes. The pumping fluid pressure is varied by periodically electrically heating a ribbon filament in a pumping fluid chamber thereby increasing the temperature and therefore the pressure and/or volume of the pumping fluid. The pumped fluid enters the pumping chamber through a one-way valve as the pumped fluid portion volume expands and is exhausted through a second one-way valve as the volume of the pumped fluid portion contracts. Control circuitry is provided to allow variations in the pulse repetition rate and pulsewidth.

Abstract: A diaphragm stack for a control device and having at least two flexible diaphragms separated by a rigid spacer and a pair of rigid outboard members with the pair of outboard members being secured together by a fastening means passing through the center of the stack. The outboard members and the spacer have interlocking means disposed inboard of the inner peripheral portions of the diaphragms and serially interlocking together in the stack to prevent rotation of the spacer and the outboard members relative to each other in their assembled relation in the stack.

Abstract: A sphincter valve for the control of fluid flow is characterized by a pair of diaphragms spaced apart from one another and having different effective areas. The smaller-area diaphragm is adapted for deflection into sealing engagement with a seating to control fluid flow thereacross, whereas the larger-area diaphragm is arranged to be exposed to operating (pilot or signal) fluid to be deflected thereby towards the smaller-area diaphragm. A thrust transmission element disposed between the diaphragms serves to deflect the smaller-area diaphragm in response to deflection of the larger-area diaphragm.

Abstract: An improvement in fuel injection systems for diesel engines, by way of example, wherein, between the engine shutdown unit of the fuel pump and the air shutdown line from the cab there is interposed suitable structure which is responsive both to raised pressure in the fuel return line of the system and also to the air shutdown system for turning off fuel supply to the engine, either intentionally or by virtue of tampering with the fuel return line by the operator.

Abstract: A flexible membrane wall divides a control valve housing into two chambers, one for a control fluid and one for a fluid to be processed, the latter chamber containing a valve seat coacting with a valve body secured to the central part of the membrane wall. This wall comprises two membrane members facing said chambers, respectively, and separated by a plurality of stiff supporting elements which are movable relative to each other. Each supporting element is pivotally connected at one end to the valve housing and at the other end to the valve body, whereby axial loads on the membrane members are transferred through the support elements to the housing and valve body.

Abstract: An apparatus for converting a hydraulic pressure signal to a mechanical motion in a way such that the amount of physical displacement of an element is directly proportional to the value of a hydraulic signal, the apparatus having a housing having a cylindrical cavity, a diaphragm within the housing dividing the cavity into a first portion and a second portion, the second portion of the cavity having walls configured as a frustocone, the base of the cone being the inner surface of the diaphragm, a shaft slidably positionable in the housing, the inner end of the shaft connecting the diaphragm so that hydraulic pressure applied to the rearward surface of the diaphragm displaces the shaft, the diaphragm contacting the conical walls as it is moved forward by increased hydraulic pressure, decreasing the effective area of the diaphragm such that the displacement of the shaft is substantially directly proportional to the pressure of the hydraulic signal.

Abstract: A fluid pressure operated control apparatus comprising a casing having an inlet and outlet for the flow of fluid under pressure, a diaphragm mounted in the casing having opposite sides thereof responsive respectively to outlet fluid pressure and a regulating pressure and valve means actuated by the diaphragm in response to pressure variations on its opposite sides for regulating outlet fluid pressure. The diaphragm is comprised of a main layer incompatible with high temperature pure steam and a protective layer. The layers are separable to provide for a contaminant fluid therebetween. The valve trim, including the valve head and stem, a valve stem guide and valve guide bushing having a snap-on valve seat, are insertable into and removable from the casing as an assembly, thereby providing for quick change of the valve trim.

Abstract: A fluid pressure operated control apparatus comprising a casing having an inlet and outlet for the flow of fluid under pressure, a diaphragm mounted in the casing having opposite sides thereof responsive respectively to outlet fluid pressure and a regulating pressure and valve means actuated by the diaphragm in response to pressure variations on its opposite sides for regulating outlet fluid pressure. The diaphragm is comprised of a main layer incompatible with high temperature pure steam and a protective layer. The layers are separable to provide for a contaminant fluid therebetween. The valve trim, including the valve head and stem, a valve stem guide and valve guide bushing having a snap-on valve seat, are insertable into and removable from the casing as an assembly, thereby providing for quick change of the valve trim.

Abstract: A movable wall assembly for use in a servomotor having a resilient diaphragm with a bead radially compressed in a groove on a hub by a backing plate to form a seal between a vacuum chamber and a power chamber. The diaphragm correspondingly axially urges the wall assembly into contact with the hub to prevent relative movement therebetween.