Abstract: A diaphragm structured for use in a diaphragm pump useful to pump a working fluid includes a first non-planar layer and a second non-planar layer. The second non-planar layer is independent from the first non-planar layer, but engaged to the first non-planar layer so that the first non-planar layer and the second non-planar layer form a closed space therebetween and travel together while flexing in an intake direction or a discharge direction within a pumping assembly of a diaphragm pump.

Abstract: A metal diaphragm damper which is resistant to breakage even if repeated stress is applied is provided. The metal diaphragm damper includes a diaphragm that is disk shaped and has a gas enclosed therein the diaphragm has a deforming action part in a center and an outer periphery fixing part on an outer periphery, the deforming action part is formed into a shape curved toward an exterior of the diaphragm, a folded part is formed in a connecting portion of the deforming action part and the outer periphery fixing part and is opened to an inner diameter side, and the folded part is movable in a radial direction.

Abstract: A diaphragm member includes a film-shaped diaphragm made of PFA and a valve body which is laser welded to a central hole portion of the diaphragm.

Abstract: This invention is a high-volume large diaphragm which provides a pair of support sections specially configured to withstand the stresses implemented by an eccentrically actuated pushrod diaphragm pump. The pair of support sections is comprised of an interior support section and an exterior support section that are vertically offset relative to each other's placement on the wall of the high-volume large diaphragm. It is additionally anticipated that more than one pair of offset interior and exterior support sections can be provided on high-volume large diaphragms with significantly greater wall height.

Abstract: It is disclosed a reciprocating compressor having a cylinder body that defines a cylinder; the cylinder may have a cylinder lateral wall and a cylinder axis A and inside it a piston is movable; at least one valve is provided to selectively open and close a valve opening formed in the cylinder lateral wall; cylinder heads at least partially protruding towards the piston inside the cylinder have a recessed surface at least partially facing the valve openings; an intersection between at least a plane containing the cylinder axis A and the recessed surface is a first curve having at least a convex part facing the valve opening.

Abstract: An operating unit for a fluid-operated diaphragm actuator, the unit consisting of a drive diaphragm, two retaining elements flanking the drive diaphragm on opposite sides and an output rod extending through these components. The drive diaphragm is mounted on the output rod by being clamped between the two retaining elements with a predetermined clamping force, wherein each of the two retaining elements is fixed on the output rod by means of a welded connection. A method that is particularly suitable for producing such an operating unit and to a fluid-operated diaphragm actuator equipped with such an operating unit.

Abstract: A pneumatic controller includes a housing, a piston located in the housing and movable therein and a diaphragm located at the piston to isolate a first chamber of the pneumatic controller from a second chamber of the pneumatic controller. The diaphragm includes a first diaphragm surface, a diaphragm opening extending through the diaphragm, and a fabric reinforcing layer to strengthen the diaphragm. A diaphragm to isolate a first chamber of a pneumatic controller from a second chamber of a pneumatic controller includes a first diaphragm surface, a diaphragm opening extending through the diaphragm, and a fabric reinforcing layer to strengthen the diaphragm.

Abstract: A disc for use in a pneumatic valve includes a stiffening insert encased in a flexible body. The stiffening insert acts to protect a central actuation region of the disc against radial compression, which may arise if the disc is used to seal against a bore hole, and against material flow towards the actuation region away from a clamped periphery. The behavior of the disc in a valve assembly is therefore more predictable and reproducible. The flexible body may further be tensioned across the stiffening insert.

Abstract: An actuator for actuating a plunger of a valve is provided. The actuator has an inlet and includes first and second hollow caps. A main actuation assembly is provided between the caps. The main actuation assembly includes a deformable diaphragm; first and second chambers, static sealing elements and a main piston movable between actuated and unactuated positions. A biasing mechanism biases the piston in the unactuated position. When pressurized gas is flown through the inlet and/or drawn from the outlet of the actuator, the first chamber expands, moving the main piston from the unactuated position to the actuated position, an actuating stem connected to the main piston thereby sliding within a channel provided in the bottom cap. Stackable actuating assemblies can also be used between the caps. Using static sealing elements advantageously avoids friction between moving parts.

Abstract: A flush valve diaphragm of a flush valve includes a body having a segmented insert within a flexible body portion and a central passageway. The body further includes a peripheral sealing portion with the flexible body portion within the peripheral sealing portion. The peripheral sealing portion can include an integral filter, an exit chamber and a bypass arrangement, such that water flowing through the filter flows through the bypass arrangement. The integral filter version will retard clogging of the bypass arrangement. The segmented insert includes a plurality of trapezoidal members with outward protrusions. The plurality of trapezoidal members are connected to each other on their outermost edge by a runner.

Abstract: A diaphragm type pressurized pump comprises a hollow cylinder formed on the top surface of each piston acting region of the diaphragm sheet. A piston head pushing chunk is disposed on the diaphragm sheet such that a ladder hole in the piston head pushing chunk receives the hollow cylinder. A fixing screw is driven via the center of the hollow cylinder into the threaded hole on each wobble plate. As a result of driving the fixing screw, the upper portion of the hollow cylinder expands thereby deforming and filling up the space between the bottom surface of the head of the fixing screw and the top surface of the ladder hole of the piston head pushing chunk, and thus preventing water from leaking and seeping into the motor of the pump.

Abstract: A diaphragm actuator for a fluid process control device comprises a housing, a diaphragm, a stem, and a plate assembly. The plate assembly includes a concave plate and a convex plate, each having inner and outer radial portions. The outer radial portions compressingly engage and retain the diaphragm. The inner radial portions are compressed together onto the stem between a shoulder of the stem and a nut threaded onto the stem. Accordingly, the concave plate forcibly engages and provides a fluid-tight seal directly with the shoulder of the stem without requiring an o-ring or any other additional sealing component. Moreover, the concave and convex plates are structurally equivalent such that the actuator may easily be switched between a biased-open configuration and a biased-closed configuration.

Abstract: A brake actuator system of a vehicle comprising a diaphragm design with a hole and sealing element in the center. The design allows for the sealing element to seal and slide on the outer diameter of the center pushrod for the exposed length. This eliminates the need for a fixed joint to permanently attach the diaphragm to the center pushrod, and allows for the pushrod to be attached to the spring piston or a separate fixed plate and reduces stress of the diaphragm at its interface.

Abstract: A diaphragm pump for pumping a fluid includes a diaphragm and a driver. The diaphragm has a first surface and a second surface. The driver includes a support portion and is connected to the diaphragm via the support portion. The driver is reciprocated to deform the diaphragm thereby performing a pumping action. The support portion includes a first supporting surface for supporting the first surface and a second supporting surface for supporting the second surface. The support portion allows the diaphragm to slidingly move along an interval between the first and second supporting surfaces when the diaphragm is deformed.

Abstract: A pump that has a flexible liner located adjacent to a diaphragm. The liner provides structural support for the diaphragm. The flexible liner can slide relative to the diaphragm. This relative movement reduces the stiffness of the diaphragm/liner assembly. The diaphragm/liner assembly is therefore both flexible and strong. Additionally, the liner provides a thermal insulator for the diaphragm. The flexible liner may be constructed from a low friction material to lower the friction between the liner and a wobble plate of the pump. Lowering the friction reduces the heat generated within the pump. The structural reinforcement, thermal insulation and lower friction features of the liner increase the life of the diaphragm and the pump.

Abstract: A vacuum unit for producing a stroke movement due to an applied vacuum. The vacuum unit includes a housing, a spring disposed in the housing, a diaphragm and a drive rod arranged on the diaphragm. The drive rod is positioned centrally on the diaphragm and is mounted in a longitudinal guide in the housing.

Abstract: A vehicle braking system vacuum booster tandem power piston connection design such that the primary piston and the secondary piston are positioned together forming the tandem power piston. A connection design that provides direct alignment between the primary piston and secondary piston upon assembly and also provides an airtight seal between the primary piston and the secondary piston when assembling the tandem power piston.

Abstract: A hydraulic fastening device, for securement of two components, for example, securement of teeth to a bucket on earthmoving or mining equipment. Each component (29) and (51) has an orifice (50) and (52) therein adapted to be substantially aligned. A body member (26) is inserted in the aligned orifices (50) and (52). A control means (34) is then operated to move at least one protrusion (40) and (41) to protrude from the body (26) and to fasten the components (29) and (51). This achieved by hydraulic operation and connection of a fluid conduit (32) between the control means 34, e.g. a grease nipple, and the protrusions (40) and (41).

Abstract: A diaphragm assembly for use in pneumatic actuators uses two or more diaphragms, one nested inside of the other. Each of the diaphragms, when shaped, includes a fabric pattern. The fabric patterns on each of the diaphragms are aligned one with another upon installation into a pneumatic actuator.

Abstract: A pump diaphragm comprising a first layer formed from a first material such as synthetic rubber which is adapted to be substantially impervious to both hydrophobic and hydrophilic liquids. In addition to the first layer, the pump diaphragm includes a second layer which is disposed in laminar juxtaposition to the first layer. The second layer is itself formed from a second material such as a thermoplastic elastomer which is adapted to possess a high level of flexibility and resiliency.

Abstract: A fuel pump which has excellent heat resistance and salt resistance, is low in cost and light in weight, and which is free from fuel leakage. The fuel pump has a bottom body formed of a thermosetting resin such as bakelite material which has heat resistance and strength, and a top body and a cover formed of a thermoplastic resin. The top body and the cover 16 are assembled with a seal member such as a gasket held between the top body and the cover, and the top body and the bottom body 12 are fixed together by a fixing element. Thereby, the main body portions of the fuel pump are constituted of resin.

Abstract: A diaphragm for an integrated pressure management system manages pressure and detects leaks in a fuel system. The integrated pressure management system also performs a leak diagnostic for the headspace in a fuel tank, a canister that collects volatile fuel vapors from the headspace, a purge valve, and all associated hoses and connections.

Abstract: An air driven double diaphragm pump including two opposed pump chambers with an air motor having air chambers therebetween. The pump chambers and air chambers form pumping cavities divided by diaphragms. Each pump chamber includes an inlet ball valve and outlet ball valve. An inlet manifold is positioned below the pump chambers and an outlet manifold above. Tie-rods extend both across the pump from one pump chamber to the other with nuts to place the assembly in compression. Tie-rods also extend from the outlet manifold through the pump chambers, to the inlet manifold and to feet mounted therebelow. Two plates, one to either side of the air motor extend to grooves in the inlet and outlet manifold and also extend to grooves in the pump chambers so as to close of the side of the pump structure. With the plates, an outlet manifold is provided from which air may be exhausted remotely. The ball valves include small diametrical clearance and a limitation on lift for added performance.

Abstract: A brake actuator having an improved push rod and end plate assembly which eliminates the requirement for thread adhesive and avoids deformation of the exterior surface of the push rod. The push rod includes an axial internally threaded bore through one end and the shank portion of the mounting screw includes an unthreaded intermediate portion adjacent the threaded end portion having a plurality of radial lobes which are turned into the internally threaded bore of the push rod securely retaining the end plate to the push rod under vibration loading and extreme temperature conditions. The radial lobes on the intermediate portion of the mounting screw each include an arcuate spiral lead surface and a flat generally radial following surface which requires only a relatively small torque to secure the end plate to the push rod, but a significantly larger torque to unthread the mounting screw from the push rod.

Abstract: A diaphragm piston having a diaphragm between a body and plate. A post integral with and extends from the body through the diaphragm and the plate. A stop is coupled to the post and limits the axial movement of the plate away from the body. A spring seat is coupled to the post. A spring is between the plate and the spring seat. The post includes a first shoulder and the stop engages the first shoulder. The stop includes an orifice shaped to move axially on the post past the first shoulder and rotate about the post and engage the first shoulder. The first shoulder has at least one circumferential recess and the orifice in the stop includes a radial tab smaller than the recess. A first lock prevents rotation between the stop and the post. A second lock is also provided preventing rotation between the plate and post. A unique stem which guides the diaphragm piston in a valve seat is provided.

Abstract: An external regeneration mechanism including a housing having two chambers and a displaceable member disposed between said two chambers and at least two passages are defined on said housing. The first passage is communicating with the first chamber and the filter outlet and the second passage is communicating with the second chamber and the filter inlet of same filter. A rod having an external handle is coupled to said displaceable member and is adapted to move by an external source of power said displaceable member linearly back and forth in order to dislodge particles and filter aid material from the external surface of the filter element.

Abstract: The present invention provides a diaphragm for use in pump applications in which at least a predetermined portion of such diaphragm is in contact with such outer piston which would tend to abrade such diaphragm. Such diaphragm is formed from at least one layer of a preselected flexible material. Such diaphragm comprises an outer bead like portion for securing the diaphragm to a pump housing. There is a annular flexure portion having a first end and a second end, such first end and such second end being generally flat and an arcuate shaped middle portion formed contiguously with the first end and the second end. Such first end is formed contiguously with the outer bead like portion. Such annular flexure portion has a substantially uniform first predetermined thickness. An enlarged bulbous portion is formed contiguously with the second end and extends around an inner periphery thereof. Such enlarged bulbous portion has a predetermined configuration.

Abstract: A selectively bonded two-ply diaphragm for a diaphragm pump having adjacent first and second layers of the diaphragm which are selectively bonded at the interface between the layers in at least one attachment portion, which is adapted for attachment to a pump. A working portion is provided in which the first and second layers are free to move relative to one another at the interface. The attachment portion may include a central portion which is adapted for attachment to a diaphragm rod of a pump and a peripheral portion surrounding the central portion which is adapted for stationary attachment to a pump housing. The working portion joins the peripheral portion and the central portion. Selective bonding of the diaphragm is by at least partially bonding or substantially bonding the first and second layers at the interface in the peripheral portion, the central portion, or both.

Abstract: An air driven double diaphragm pump including two opposed pump chambers with an air motor having air chambers therebetween. The pump chambers and air chambers form pumping cavities divided by diaphragms. Each pump chamber includes an inlet ball valve and outlet ball valve. An inlet manifold is positioned below the pump chambers and an outlet manifold above. Tie-rods extend both across the pump from one pump chamber to the other with nuts to place the assembly in compression. Tie-rods also extend from the outlet manifold through the pump chambers, to the inlet manifold and to feet mounted therebelow. Two plates, one to either side of the air motor extend to grooves in the inlet and outlet manifold and also extend to grooves in the pump chambers so as to close of the side of the pump structure. With the plates, an outlet manifold is provided from which air may be exhausted remotely. The ball valves include small diametrical clearance and a limitation on lift for added performance.

Abstract: A diaphragm-type double-acting process pump has a reduced number of members to be assembled to a center plate and also a reduced number of hermetically sealed portions. A space defined by the center plate, together with a side cover and a side body, which are provided on both sides, respectively, of the center plate, is divided by two diaphragms into left and right driving chambers inside the diaphragms and left and right pump chambers outside the diaphragms. The left and right pump chambers are communicated with a suction opening through check valves and also communicated with a discharge opening through check valves. The center plate is fitted in a recess formed in the side body, and the side cover is brought into contact with both the side body and the center plate to clamp the center plate by the side cover and the side body.

Abstract: A fluid powered diaphragm pump with an adjustable stroke is provided. The stroke of the pump is adjusted by providing an inner diaphragm plate assembly that includes a retractable piston. The piston is biased towards the inner plate by one or more standoffs that attach the piston to the plate. The bias of the piston is overcome by pressurized fluid that is communicated to a chamber defined by the piston and the inner plate. The fluid may be communicated to the chamber through the diaphragm rod. The inner diaphragm plate assemblies of both diaphragm chambers may be connected to different pressurized fluid supplies there enabling the stroke or capacity of the two diaphragm chambers to be controlled independently. As a result, the stroke or capacity of the two diaphragm chambers may differ.

Abstract: A combination pump diaphragm and outer piston arrangement used in certain pump applications in which at least a portion of such diaphragm is in contact with an outer piston which would tend to abrade the diaphragm. The combination comprises a diaphragm member which includes a generally flat portion, a generally flexure annular portion and an enlarged bead like wear ring portion disposed intermediate such generally flat portion and such generally flexure annular portion. Such bead like wear ring portion has a first predetermined diameter and a predetermined configuration. The outer periphery of such diaphragm member is secured to a pump housing. An outer piston member is disposed for securing such diaphragm member to a piston rod of a pump. Such outer piston member includes a generally flat portion contacting such generally flat portion of such diaphragm member and an arcuate portion contacting such enlarged bead like wear ring portion.

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: A backup washer for clamping a diaphragm having a flexible washer disposed next to a rigid washer, the flexible washer including a material less stiff than a material of the rigid washer. The flexible washer may include an elastomer material such as rubber. A flexible washer having a varied stiffness profile may also be provided to the face by incorporating materials having different stiffnesses, contouring, or both. The rigid washer may include a metal, plastic, composite materials, or combinations of these and may also be bowed or ribbed. The flexible washer and rigid washer of the backup washer may mechanically fastened, bonded, or molded together. A diaphragm pump having a diaphragm which is clamped by at least one backup washer having a flexible washer which includes a material less stiff than the material of the diaphragm and a rigid washer next to the flexible washer which includes a material more stiff than the diaphragm material.

Abstract: On a hydraulic diaphragm pump with a diaphragm including at least two individual layers, a dimensionally stable reinforcing element that moves together with the diaphragm and is kept in contact with the diaphragm is provided in the central area of the diaphragm. The inlet and outlet channels of the diaphragm pump open into the delivery chamber radially within the reinforcing element at least for the most part so the channels are covered accordingly by the reinforcing element.

Abstract: A diaphragm assembly has a center disk in which use of a metal member is not required. The center disk comprises first and second center disk members, made of resin, embracing a resin diaphragm between them. The first center disk member has an inwardly directed inner flange on an inner peripheral wall defining a resin charging space, and the second center disk member comprises a resin-molded body, formed by charging a resin, and has an outwardly directed outer flange. A portion of the diaphragm is clamped between the inner flange and the outer flange.

Abstract: A two-piece diaphragm assembly for a fluid powered diaphragm pump is provided. The diaphragm assembly includes a key as part of a overlay diaphragm extending towards a recess in a backup diaphragm, for properly aligning the overlay diaphragm and the backup diaphragm during installation of the diaphragm assembly. The diaphragm assembly also provides an improved mechanism for attaching the inner plate of the diaphragm assembly to the outer plate of the diaphragm assembly. A method of installing a two-piece diaphragm assembly onto a fluid powered diaphragm pump is also provided.

Abstract: A diaphragm pump is provided having a plurality of piston inlets connecting a hydraulic fluid source with the piston chamber and a plurality of check valves each having a ball and valve seat disposed within the inlets. The valve seat includes a conical section sloped such that the tangential contact point between the ball and valve seat is located at a position outward from the inner edge of the valve seat. The distance the ball is permitted to move between the open and closed positions is such that the check valve closes substantially in conjunction with the piston beginning its power stroke and the ball is not able to generate a high closure velocity. A diaphragm plunger includes a spherical surface portion designed to impact a diaphragm stop at a position away from the edges of the stop and plunger. An isolation reservoir is connected to a piston reciprocating chamber such that hydraulic fluid completely fills the piston reciprocating chamber and further flows into the isolation reservoir.

Abstract: A diaphragm pump 1 has a reciprocating piston 2 operated with the aid of a connecting rod 5 and by this means moves an attached diaphragm 4 fixed in the pump housing 3. The connecting rod 5, in turn, is acted upon and driven at the end facing away from the reciprocating piston 2 by an eccentric 6 or a cranked portion of the drive shaft 11. The rotating masses and at least part of the oscillating masses of the pump are balanced by at least one fixedly mounted counterweight 7 moving in synchronism therewith. For the automatic correction of varying out-of-balance conditions due to variable gas forces or medium forces, a self-regulating system of rolling elements 12 is provided in an annular, empty cavity 9 that is arranged concentrically to the axis of shaft rotation and is situated within a co-rotating housing 10.

Abstract: The invention relates to a double diaphragm pump having flexible diaphragms disposed in displacement spaces and connected and mechanically coupled to piston rods, the displacement spaces being communicated via check valves to a suction manifold on the one hand and to a pressure manifold on the other hand, wherein each diaphragm is connected to a piston rod, which piston rods extend coaxially and are mounted on opposite sides to a guide frame having at least one lineal guide for a guide block which rotatably mounts a crank pin of a crankshaft.

Abstract: Insulation is provided in the form of wall insulation, piston or diaphragm insulation and/or piston rod and/or diaphragm washer insulation to increase the temperature in the working air chamber of an air motor of the piston or diaphragm type to reduce the formation of ice on exhaust.

Abstract: The present invention is a wobble plate pump typically used in a reverse osmosis water purification system. The pump has a piston that is coupled to a wobble plate by a rocker arm. The piston has a stem which snaps into a corresponding sleeve of a diaphragm. The diaphragm is attached to the rocker arm and extends across the inner diameter of the pump to provide an inner pump seal. The piston stem and diaphragm sleeve extend through an access opening in a diaphragm support plate. The access opening of the wobble plate has an inner lip defined by a first relatively small radius near the center of the pump and a second relatively larger radius at the outer portion of the pump. The dual radiuses allow the piston to symmetrically reciprocate about a surface of the diaphragm support plate without inducing excessive stresses in the diaphragm. The symmetrical reciprocating motion maximizes the compression ratio of the pump.

Abstract: A pump comprising a pumping chamber (3) for pumping a liquid; at least part of the pumping chamber (3) being formed by a pumping means (6) having a pumping area (A2); an actuation chamber (2) in communication with a source of pressurised fluid, at least part of the, actuation chamber (2) being formed by an actuation means (5) having an actuation area (A1); a connection means (7) connecting the actuation means and the pumping means, so that, at least during those times that liquid is required to be pumped by the pump, variations of the pressure in the actuation chamber effect movement of the actuation means which in-turn effects movement of the pumping means to enable supply of liquid to the pumping chamber and delivery of liquid therefrom; wherein the pressure within the pumping chamber is greater than the pressure within the actuation chamber.

Abstract: A vacuum operated speed range shifting mechanism for use in a drivetrain subassembly having input and output shafts, each being rotatably mounted within a support structure. The shifting mechanism comprises an annular shift sleeve surrounding and splined to the output shaft for rotation therewith, with the sleeve being axially moveable between first and second axial positions corresponding to low and high speed modes of operation of the drivetrain subassembly. The mechanism further includes a stationary annular housing disposed coaxially about the shift sleeve within the support structure. The housing is axially restrained by the support structure and defines an interior chamber. A flexible annular diaphragm is attached to the housing and disposed within the housing so as to divide the interior chamber into first and second annular cavities which are substantially hermetically sealed. A shift collar assembly is attached to the diaphragm and is disposed in surrounding relationship with the shift sleeve.

Abstract: A diaphragm for spring brake actuators includes an aperture that receives a threaded securement member such that the diaphragm is directly fixed to a push rod. In this way, misalignment between the push rod and the diaphragm is eliminated. To overcome any leakage through the aperture the diaphragm is formed with sealing beads compressed by the securement member to achieve a seal. Preferably, diaphragm plates are received on each side of the diaphragm, and the sealing beads are compressed by the securement member to achieve a seal between the securement member and the diaphragm plates. An adequate seal is thus achieved, while still allowing the direct connection of the diaphragm to the push rod by a threaded connecting member. The diaphragm plate on the power spring side of the diaphragm extends upwardly into a recess in the power spring plate, and is in facial contact in an axial direction with a surface of the power spring plate when the spring is actuated.

Abstract: A multi-thickness diaphragm member including clamping sections that are sized for assembly of the diaphragm in standard air brake valve devices and a flexure portion intermediate the clamping sections that forms a convolution during assembly. The thickness of the flexure portion is less than that of the clamping sections to facilitate formation of the diaphragm convolution without wrinkling, in order to alleviate progressive fatigue failure. The thin flexure portion of the diaphragm is joined with the respective clamping sections through a tapered area, which lies entirely outside of the annular space in which the diaphragm convolution forms during assembly, to thereby maximize the radius of curvature of the convolution for optimum utilization of the flexure portion in forming the convolution.

Abstract: A method of making and the product of the method in a diaphragm for use in a pressure regulator, or other similar uses, where leakage around the confined edges of the diaphragm must be avoided. The structure confining the edges of the diaphragm consists of a main housing body having a groove for receiving a rib or the outer periphery of the diaphragm and a secondary housing to clamp the periphery. The central portion of the diaphragm carries a top plate with a bottom groove to receive a rib on the central periphery of the diaphragm and a bottom disc to clamp the inner periphery. Diaphragms are made with a fabric sandwiched between flexible layers of material. This results in a flash edge which may cause wicking and prevents a proper seal in the grooves receiving the ribs. An angled trim on the peripheries allows a proper filling of the grooves and a leak proof seal.

Abstract: An improvement of a reaction transmitting mechanism for a booster is disclosed. A forward end face of a tubular portion of a valve body which abuts against a reaction disc is provided with an uneven surface. This presents a resistance to an elastic deformation of the reaction disc when a brake booster is actuated. Accordingly, an enhanced hysteresis, which represents a difference in the output between when depressing and releasing a brake pedal, is provided without increasing the hardness of the reaction disc.

Abstract: In a diaphragm pump with mechanically driven diaphragm and a device for diaphragm rutpure signaling, wherein the diaphragm 2 is clamped at the edge between a pump body 3 and pump cover 4 and is centrally firmly connected with a support plate 5 serving to drive the diaphragm, the design is such that the diaphragm is formed as a multi-layer sandwich diaphragm 2, whose individual layers or diaphragm plies are clamped jointly in the edge region between pump body 3 and pump cover 4. The sandwich diaphragm 2 consists of a working diaphragm 18 with at least one diaphragm ply and a protective diaphragm 20 also with at least one diaphragm ply. The latter is formed so that, with the working diaphragm 18 intact, it is clearly stressed by the delivery pressure less than the working diaphragm 18. Lastly the device for diaphragm rupture signaling has at least one channel 22, 25 disposed between the diaphragms 18, 20 and brought to the outside, for signaling a rupture of the working diaphragm 18.

Abstract: A fluid pumping apparatus and system including a double acting diaphragm pumping device in which each pumping component has a pair of spaced apart diaphragms defining a containment chamber and all exposed surfaces in the pumping chamber and the containment chamber are made of an inert plastic material, a fluid sensor extending into each containment chamber for sensing the presence of unwanted fluids therein, and a pump control system for activating the pumping apparatus and responding to an output signal generated by either sensor to deactivate the pumping apparatus in the event of leakage of fluid into either containment chamber.