Abstract: A pedal simulator includes a cylinder mechanism for absorbing a fluid pressure generated in a pressurization chamber of a master cylinder by operating a brake pedal. The cylinder mechanism includes a housing, a piston slidably held in the housing and defining a fluid chamber for introducing a working fluid thereinto, and a plurality of spring members for urging the piston toward the fluid chamber. The housing includes an open end on an opposite side of the housing from the piston, and a lid member which covers the open end. The lid member is composed of a member separate and distinct from the housing. The lid member is provided with a damper made of a rubber member.

Abstract: A hydraulic accumulator includes a cylindrical body or housing having male or external threads on each end and shoulders proximate the ends of the threads nearer the center of the cylindrical body or housing that act as stops. An end cap having internal or female threads is disposed at one end of the accumulator. The accumulator may be threaded into a manifold or control valve assembly or it may include a second threaded end cap having an access, i.e., inlet/outlet, port. A piston resides within the accumulator and is biased by a pair of compression springs toward the manifold, control valve body or second threaded end cap.

Abstract: An accumulator assembly for a motor vehicle powertrain includes an armature and a follower. Together the armature and the follower can selectively lock together. The accumulator assembly may include a biasing member and a solenoid. When the solenoid is de-energized, the biasing member pushes the armature towards the follower to lock the armature and the follower together. When the solenoid is energized, the armature is magnetically drawn towards the solenoid and away from the follower to unlock the two components and to compress the biasing member.

Abstract: An accumulator assembly comprises an accumulator cylinder formed of a cylindrical, gas-impermeable shell and a cylindrical gas-impermeable sleeve disposed within and substantially concentric with the shell. An interstitial space is formed between the sleeve and the shell. A piston slidably is disposed within the sleeve, the piston separating an interior of the sleeve into a first chamber configured to contain a compressed gas, and a second chamber configured to contain a pressurized fluid. A pair of removable axial closures retained to the gas-impermeable sleeve at opposing ends and sealingly engaged with corresponding opposing ends of the gas-impermeable shell is configured to provide maximum resistance to the tensional stress of the sleeve.

Abstract: A hydraulic accumulator 10 is provided with a rotatable gas manifold 12. The accumulator 10 includes a shell 16 having a hydraulic fluid pressure end 26 and a charged gas end 28. The charged gas end is closed by a closure assembly 44. The manifold 12 includes a body 102 and a locking connector 150. The body 102 includes fluid ports 112, 114 and 116 that are in fluid communication with an annular connector port 182. The locking connector 150 includes a threaded stem 152 that is connected to the closure assembly 44 and provides a single point rotatable connection for attaching, detaching and aligning the fluid ports 112, 114 and 116 relative to the accumulator 10.

Abstract: To restrain abnormal deformation of a bellows due to a pressure difference between the inside and outside thereof, an outside gas type accumulator includes a pressure difference regulation mechanism (21) having a movable plate (22) supported by a coil spring (23) on the oil port (4) side of a bellows cap (8), the plate (22) moves together with the cap (8) in a state of being supported by the spring (23), during normal operation, the plate (22) moves together with the cap (8) to be brought into contact with a seal (13) at zero-down time, and the plate (22) keeps contact with the seal (13) and the cap (8) moves to a position where liquid pressure and gas pressure balances while compressing the spring (23) when the liquid and the charged gas expand thermally.

Abstract: A damper arrangement (10) has a first Helmholtz damper (11) connected in series to a second Helmholtz damper (12). The resonance frequency of the first Helmholtz damper (11) and the resonance frequency of the second Helmholtz damper (12) are shifted from one another in an amount producing a synergic damping effect.

Abstract: Disclosed is a low pressure accumulator for an anti-lock brake system of a vehicle. The low pressure accumulator includes a cylinder having one end communicated with a fluid path connected to a valve and a pump and an opposite end formed with an opening, a piston moving back and forth in the cylinder, a spring installed in the cylinder to elastically support the piston, and a plug installed in the opening of the cylinder to support one end of the spring. The plug includes a vent to ventilate air through an inside and an outside of the cylinder.

Abstract: An accumulator assembly is includes a piston located within a pressure canister. The pressure canister has a piston stop therein. The piston stop is located radially outboard of a biasing member or spring located within the pressure canister between the pressure canister and the piston. A support bracket is disposed on an end of the pressure canister in alignment with the spring. The outboard piston stop and the support bracket reduce the stresses due to reaction forces when the accumulator assembly is fully charged. By reducing the stresses due to reaction forces, the accumulator assembly can be made from steel casting or plastic molding without sacrificing the charge capacity of the accumulator assembly.

Abstract: An apparatus comprises a cavity coupled to a pneumatic controller configured to control pressure in the cavity; a piston configured to be pulled into the cavity when pressure in the cavity is below atmospheric pressure and to be pushed outward when pressure in the cavity is greater than atmospheric pressure; and a gripper arm mechanically coupled to the piston. The gripper arm may be configured to support a device under test. The gripper arm may be coupled to the piston through a pusher bar. The apparatus may further comprise a pneumatic control port; and a pneumatic bleed port. The pneumatic control port is coupled to the cavity, and the pneumatic bleed port is configured to bleed pneumatic pressure to atmosphere if the piston over-travels a predetermined position.

Abstract: A piston-in-sleeve accumulator includes a cleaning element positioned on the piston and configured to remove and prevent debris from lodging between the piston and a cylindrical nonpermeable sleeve within which the piston slides. A seal on the piston is positioned to engage an opposing surface in the event of a leak, and thereby prevent the possibility of a complete drainage of pressurized fluid from occurring through the accumulator's fluid port. A position contactor switch is further provided to signal position of the piston within the accumulator.

Abstract: Pressure-balanced accumulator apparatus for use in subsea operations is disclosed which comprises a housing and an accumulator within the housing at the first end of the housing. The accumulator has first and second chambers that are hermetically sealed from one another, with a pressurized gas in the first chamber and a pressurized fluid in the second chamber. A third chamber in the housing abuts the accumulator and contains silicon oil fluid. A movable piston is located within the housing proximate the second end of the housing. Ambient pressure is communicated to one end of the piston, and ambient pressure plus the pressure in the second chamber is communicated to the second end of the piston. The cross-sectional areas of the two ends of the piston are selected to optimize the pressure at which the piston begins to expel fluid from the second chamber.

Abstract: A hydraulic accumulator including a fluid chamber and a displaceable piston that is connected to a piston position-measuring means is disclosed. Embodiments of the hydraulic accumulator can provide a device that measures the available fluid volume in the accumulator. In embodiments, the displaceable part of the piston may separate fluid volume from gas volume, and may be connected to a wire that runs through the fluid volume and exits the outside of the accumulator through a sealed opening. Further, in embodiments, the wire may be led over pulleys and through a hollow member connected to the accumulator. The position of an associated metallic core member can be electrically monitored to provide position and fluid volume information.

Abstract: A piston accumulator (10) comprises a pressure chamber (40) which on one side is closed by a piston (50) axially displaceable in a pipe (20) in order to change its volume depending on the axial position of the piston (50). A detent mechanism is provided in order to hold back the piston (50) against a spring preload (190) in a second position differing from a first position. The piston (50) is formed in a multi-part fashion and comprises at least a first piston part (52) and a second piston part (54), wherein at least one of the two piston parts (52) is hardened and disposed to cooperate with the detent mechanism in a catching fashion.

Abstract: A lightweight high pressure repairable piston composite tie-rod accumulator that does not use a load bearing metallic liner. An exemplary accumulator includes composite tie rods that sustain the axial stress induced by pressurization of the accumulator, while the shell is designed such that it sustains the stress of pressurization in the hoop direction. The tie rods can be secured using a wedge-type tie rod retention mechanism. As a result, no pretension is applied to the tie rods and the composite shell may be designed entirely for hoop stress.

Abstract: Pressure-balanced accumulator apparatus for use in subsea operations is disclosed which comprises a housing and an accumulator within the housing at the first end of the housing. The accumulator has first and second chambers that are hermetically sealed from one another, with a pressurized gas in the first chamber and a pressurized fluid in the second chamber. A third chamber in the housing abuts the accumulator and contains silicon oil fluid. A movable piston is located within the housing proximate the second end of the housing. Ambient pressure is communicated to one end of the piston, and ambient pressure plus the pressure in the second chamber is communicated to the second end of the piston. The cross-sectional areas of the two ends of the piston are selected to optimize the pressure at which the piston begins to expel fluid from the second chamber.

Abstract: A piston accumulator (10) comprises a pressure chamber (40) which is closed on one side by an axially shiftable piston (50) in order to change its volume depending on the axial position of the piston (50). A locking mechanism is provided for retaining the piston (50) in a second position different from a first position against a spring preload (190). The piston accumulator (10) further comprises an electromagnetic apparatus (80) having an armature (150) which is shifted upon axial shifting of the piston (50) from the first into the second position in its turn into an axial position in which a blocking element (175) of the locking mechanism is held by the armature (150) in a radial position so as to block a shift of the piston (50) back in the direction of its first position. For holding the blocking element (175) there is provided a separate interlocking member (170) which is fastened to the armature (150) and is made of a harder material than the armature (150).

Abstract: A breathable low pressure accumulator includes a housing with a cylindrical bore formed therein. A piston slides within the bore and includes an elastic piston head. A biasing member urges the piston towards a first end of the bore. At least one passage communicates between an exterior of the housing and a volume that is enclosed by the bore and the elastic piston head. The elastic piston head is formed of rubber. The elastic piston head is molded into the piston.

Abstract: The invention relates to a braking device for a motor vehicle fitted with an air conditioning circuit (K), this braking device comprising a source of fluid (F1) at a relatively high pressure, a source of fluid (F2) at a relatively low pressure, and a pneumatic brake booster (F3) selectively connected to one or other of the sources of fluid (F1, F2). According to the invention, the source of fluid (F1) at a relatively high pressure comprises a portion (KC1) of the air conditioning circuit (K) that is placed downstream of the air conditioning compressor (K1) and upstream of the air conditioning expansion valve (K2), in one direction of flow (X) of the cooling fluid in the air conditioning circuit (K).

Abstract: A breathable low pressure accumulator includes a housing with a cylindrical bore formed therein. A piston slides within the bore and includes an elastic piston head. A biasing member urges the piston towards a first end of the bore. At least one passage communicates between an exterior of the housing and a volume that is enclosed by the bore and the elastic piston head. The elastic piston head is formed of rubber. The elastic piston head is molded into the piston.

Abstract: A hydropneumatic accumulator with a flexible porous filler intended for fluid power recuperation in hydraulic systems with a high level of pulsations includes a shell where a gas port and a fluid port are connected, respectively, with a gas reservoir and a fluid reservoir of variable volume separated by a movable separator. The flexible porous filler fills the gas reservoir so that the separator movement reducing the gas reservoir volume compresses said filler. The filler is connected with internal walls of the gas reservoir with the possibility of stretching the filler at the separator movement increasing the volume of the gas reservoir. The accumulator contains means of protection of the filler boundary layer against rupture made with the possibility of reducing local deformations of the boundary filler layer in case of jerks of the separator.

Abstract: A fuel pressure damper (10?) includes a housing (15) defining an inlet (46) constructed and arranged to receive fuel. An orifice disc (54) is provided at the inlet and includes at least one orifice (58). A cover (22) is coupled to the housing. A flexible diaphragm (12) has a periphery fixedly secured to at least the housing or the cover and has a freely movable central portion (36). A compression spring (14) biases the diaphragm to a normal position. In an operating position, the central portion of the diaphragm alone, or in combination with the spring, is constructed and arranged to dampen fuel pressure pulsations at the inlet. The orifice is constructed and arranged to ensure that pressure pulsations of a certain magnitude are prevented from entering the damper and damaging the diaphragm.

Abstract: A hydraulic oscillating motor which has at least two working chambers which are coupled via pressure lines to a device for pressure compensation. A first working chamber is connected to a first pressure line and a second working chamber is connected to a second pressure line. The motor further has a device for pressure compensation with a first compensating cylinder and a second compensating cylinder. Each of the compensating cylinders has in each case one compensating volume and in each case one elastic force store for delimiting the respective compensating volume. The compensating volume of the first compensating cylinder is connected to the first pressure line, and the compensating volume of the second compensating cylinder is connected to the second pressure line.

Abstract: A pressure accumulator, especially a pulsation damper, includes an accumulator housing (10) and a piston element (28) disposed in it. A bellows-type separative element (30) is supported on the piston part (28) with its one end (32) and with its other end (34) on the accumulator housing (10). The separative element (30) separates two working chambers (26, 40) within the accumulator housing (10) from each other, especially a gas chamber (26) from a fluid chamber (40), in a fluid-tight, especially gas-tight manner. To one working chamber (26), in addition to a defined volumetric proportion of a working gas, is filled with a fluid. In this manner, the working gas allows for a compression to a certain degree and for a dampening and smoothening of the pulsations of the fluid medium migrating to and occurring on the fluid side of the accumulator.

Abstract: A pulsation attenuator for a fluidic system with a fluidic pump. The pulsation attenuator includes a fluidic channel, a first fluidic device adapted to attenuate pulsations, and a second fluidic device adapted to attenuate pulsations. Preferably, the first fluidic device includes a first fluidic resistor and a first fluidic capacitor, and the second fluidic device includes a second fluidic resistor and a second fluidic capacitor. Preferably, the first fluidic resistor and second fluidic resistor are resistive channels. Preferably, the first fluidic capacitor and second fluidic capacitor include a membrane that expands and accumulates fluid and then contracts and reintroduces the accumulated fluid into the fluidic channel.

Abstract: An open port is provided on an inner peripheral surface of the cylinder bore of the reservoir apparatus and the port is exposed to the exterior of the reservoir apparatus. A hollow portion is formed concentrically with the port on a reservoir body. An annular thin portion is formed between the inner peripheral surface of the cylinder bore and the hollow portion surrounding the port in a radial direction. The thin portion is outwardly deflected and deformed by being pushed outwardly in a radial direction centering on the port in a range narrower than the inner diameter of the hollow portion. Thus, the opening of the port is outwardly sunk from the inner peripheral surface of the cylinder bore thereby to form a curved surface at a root portion of the thin portion on the inner peripheral surface of the cylinder bore.

Abstract: A duct for a hydraulic steering system comprises a pipe for feeding a fluid and a device for absorption of the fluid pressure pulses is provided. In particular, the device defines a chamber which is connected in parallel to the pipe by means of a first and a second connection, a mobile inertial element defining a first and a second compartment inside the chamber, and resilient means acting on the inertial element in order to maintain the inertial element in an intermediate position, such as to define a first and a second compartment inside the chamber and communicating by means of a leakage defined by a passage.

Abstract: To prevent abnormal deformation of a bellows, an accumulator has a regulation mechanism for reducing a pressure difference generated when liquid sealed in a liquid chamber and charged gas are thermally expanded at a zero-down time, a seal plate is arranged in an inner peripheral side of a bellows floating end, an elastically deformable thin plate is bonded to the seal plate, an outer peripheral portion of the thin plate is bonded to the bellows floating end, the seal plate is away from a seal at a time of a steady operation, the seal plate contacts with the seal at a zero-down time, and the thin plate is elastically deformed to make liquid pressure balance with gas pressure while the seal plate being kept in contact with the seal when the liquid and gas are thermally expanded.

Abstract: A pressure-compensated accumulator bottle is provided. In one embodiment, the accumulator bottle includes a housing and an interior wall that generally define first, second, and third chambers within the housing. In this embodiment, a spring is disposed in the second chamber and configured to apply a biasing force on a first piston disposed within the first chamber. Further, in this embodiment, an additional piston is disposed within the third chamber and is configured to facilitate balancing of the pressure of a fluid disposed in the second chamber with the pressure of the external environment such that the magnitude of a second biasing force applied on the first piston by the pressure of the fluid depends at least in part on the pressure of the external environment. Hydraulic circuits and systems including a pressure-compensated accumulator bottle are also disclosed.

Abstract: To prevent plastic deformation of a bellows due to a pressure difference between inner and outer sides of the bellows in an outside gas type or inside gas type accumulator, a disc-like gasket is held in a floatable state to a surface close to a stay in a bellows cap by a gasket holder, so that, the disc-like gasket moves together with the bellows cap at a steady operation time, the disc-like gasket moves together with the bellows cap to contact with an end surface portion of the stay, thereby closing the liquid chamber at a zero-down time, and the bellow cap moves toward a position where liquid pressure and gas pressure balance while the disc-like gasket keeps contacting with the stay due to a difference of pressure receiving areas in both the surfaces when the liquid in the liquid chamber is thermally expanded at a zero-down time.

Abstract: To restrain abnormal deformation of a bellows due to a pressure difference between the inside and outside thereof, an outside gas type accumulator includes a pressure difference regulation mechanism (21) having a movable plate (22) supported by a coil spring (23) on the oil port (4) side of a bellows cap (8), the plate (22) moves together with the cap (8) in a state of being supported by the spring (23), during normal operation, the plate (22) moves together with the cap (8) to be brought into contact with a seal (13) at zero-down time, and the plate (22) keeps contact with the seal (13) and the cap (8) moves to a position where liquid pressure and gas pressure balances while compressing the spring (23) when the liquid and the charged gas expand thermally.

Abstract: The disclosure relates to a thermostatic mixer, including a device for the dynamic regulation of the cold water flow which supplies the mixer. A resistance is generated to the flow of cold water supplied to the thermostatic mixer when small flows of mixed water are required, and said resistance is lifted or reduced when large flows of mixed water are required. Said operation is automatically carried out by devices for dynamic regulation of flow, whereby the flow cross-section provided for the incoming cold water is reduced when the drawn flow is reduced and a larger flow cross-section reestablished when a larger flow is required.

Abstract: A variable-diameter rotor comprises a hub with a shaft and rotor blades, wherein each of the rotor blades comprises a radially internal blade part and a radially external blade part. In each of the rotor blades, a jackscrew mechanism is arranged therein and includes a jackscrew arranged in the radially internal blade part and a nut connected with the radially external blade part, the nut cooperating with the jackscrew for radially moving the radially external blade part with respect to the radially internal blade part. The rotor further comprises an energy storage system, including a compressed-gas accumulator. The compressed-gas accumulator comprises a volume of gas and a piston for compressing and expanding the volume of pressurized gas. The energy storage system also includes a means for converting a radial motion of the radially external blade part into a motion of the piston of the compressed-gas accumulator and vice-versa.

Abstract: The invention relates to an electronically regulatable vehicle brake system with traction control, in which a master cylinder is connected indirectly via a hydraulic unit to at least one wheel brake. The hydraulic unit has electromagnet valves and an externally triggerable pressure generator, for modulating the wheel brake pressure, optionally independently of the driver. For preventing wheel slip, the pressure generator is connected by its intake side to an intake conduit, among other things, that is controllable by an intake valve. To enhance the dynamics and improve the regulatability of a vehicle brake system, a self-aspirating pressure fluid storage unit is connected to the intake conduit and makes an aspiration volume available to the pressure generator.

Abstract: The disclosure relates to a device for dynamic adjustment of a water flow, used to stabilize the operational mode of a thermostatic mixing tap. The inventive device includes a valve consisting of a piston and a return spring forcing the piston into a first position, said piston being displaced into two positions according to the flow. When the flow is lower than a threshold value, the piston is located in the first position and a flow limited means limits the flow. When the flow exceeds the threshold value, the piston is displaced into the second position and the flow limiting means is obviated.

Abstract: To prevent plastic deformation of a bellows due to a pressure difference between inner and outer sides of the bellows in an outside gas type or inside gas type accumulator, a disc-like gasket is held in a float able state to a surface close to a stay in a bellows cap by a gasket holder, so that, the disc-like gasket moves together with the bellows cap at a steady operation time, the disc-like gasket moves together with the bellows cap to contact with an end surface portion of the stay, thereby closing the liquid chamber at a zero-down time, and the bellow cap moves toward a position where liquid pressure and gas pressure balance while the disc-like gasket keeps contacting with the stay due to a difference of pressure receiving areas in both the surfaces when the liquid in the liquid chamber is thermally expanded at a zero-down time.

Abstract: The disclosure relates to a device for dynamic control of a water flow, including the following items in a body: a feed chamber, a discharge chamber and a piston arranged between the feed chamber and the discharge chamber. The piston can be displaced from a first position, which is offset towards the feed chamber and wherein the piston narrows the flow between the feed chamber and the discharge chamber, and a second position, which is offset towards the discharge chamber and wherein the piston does not narrow the flow between the feed chamber and the discharge chamber.

Abstract: A reactive acoustic dampener includes a nested three chambered configuration and connecting tubes that may be fully integrated into the fuel rail of a fuel injection system.

Abstract: The disclosure relates to a thermostatic mixer, including a device for the dynamic regulation of cold water flow which supplies the mixer. A resistance is generated to the flow of cold water supplied to the thermostatic mixer when small flows of mixed water are required, and said resistance is lifted or reduced when large flows of mixed water are required. Said operation is automatically carried out by devices for dynamic regulation of flow, whereby the flow cross-section provided for the incoming cold water is reduced when the drawn flow is reduced and a larger flow cross-section reestablished when a larger flow is required.

Abstract: A gravity-controlled constant-pressure and pressure-regulation device includes a canister, a weight block, and a seal head. The canister includes a metal layer, an epoxy resin layer, and a plastic sheet layer. The metal layer serves as an inner lining. The epoxy resin layer surrounds an outer circumference of the metal layer. The plastic sheet layer surrounds an outer circumference of the epoxy resin layer. The weight block is movably received in the canister. The metal layer has an inner surface movably and receivingly engages the seal head. The weight block is mounted to the seal head. The weight block is movable upward and downward inside the canister by being acted upon by a gravity force of weight thereof and a lifting force induced by an internal pressure inside the canister to effect mass storage of air inside the canister and stable supply air at constant pressure.

Abstract: A lightweight, optimally efficient, easily serviced, piston-in-sleeve high pressure accumulator is provided. The accumulator includes one or more cylindrical composite pressure vessel separate end cap manifolds. A piston slidably disposed in a thin impermeable internal sleeve in the accumulator separates two chambers, one adapted for containing a working fluid and the other adapted for containing gas under pressure. Gas is provided in a volume between the impermeable internal sleeve and the composite pressure vessel wall. Additional gas is optionally provided in gas cylinders. Further components are provided for withstanding harmful effects of radial flexing of the composite vessel wall under high pressures, and from stresses present in use in mobile applications such as with a hydraulic power system for a hydraulic hybrid motor vehicle.

Abstract: An hydraulic pressure reservoir having at least one pressure chamber with a fluid connection to a hydraulic circuit. The pressure chamber is formed between a movable partition member carried in a housing and having a pressure limiting valve, and a fixed partition. The movable partition member is in the form of a diaphragm spring.

Abstract: A piston accumulator (10) comprises a pressure chamber (40) which on one side is closed by a piston (50) axially displaceable in a pipe (20) in order to change its volume depending on the axial position of the piston (50). A detent mechanism is provided in order to hold back the piston (50) against a spring preload (190) in a second position differing from a first position. The piston (50) is formed in a multi-part fashion and comprises at least a first piston part (52) and a second piston part (54), wherein at least one of the two piston parts (52) is hardened and disposed to cooperate with the detent mechanism in a catching fashion.

Abstract: A piston accumulator (10) comprises a pressure chamber (40) which is closed on one side by an axially shiftable piston (50) in order to change its volume depending on the axial position of the piston (50). A locking mechanism is provided for retaining the piston (50) in a second position different from a first position against a spring preload (190). The piston accumulator (10) further comprises an electromagnetic apparatus (80) having an armature (150) which is shifted upon axial shifting of the piston (50) from the first into the second position in its turn into an axial position in which a blocking element (175) of the locking mechanism is held by the armature (150) in a radial position so as to block a shift of the piston (50) back in the direction of its first position. For holding the blocking element (175) there is provided a separate interlocking member (170) which is fastened to the armature (150) and is made of a harder material than the armature (150).

Abstract: A hydraulic accumulator, especially a piston accumulator includes an accumulator housing (10) and a separating piston that can be longitudinally displaced in the accumulator housing (10) and divides two working chambers (12) inside the accumulator housing (10). The housing is sealed on each end by one cover part (16). At least one cover part is fixed, on one side (32) by a free longitudinal edge (34) of the accumulator housing (10). The edge is arranged against the cover part (16). By connecting the free longitudinal edge (34) of the accumulator housing (10) to the associated cover part (16) by a peripheral weld seam (46) for sealing at least one working chamber (12) from the environment in a gas-tight and/or fluid-tight manner, a reliable sealing is obtained by the weld seam (46). The weld seam also connects the free longitudinal edge (34) of the accumulator housing (10) to the associated cover part (16).

Abstract: The invention relates to a hydraulic accumulator, particularly in the form of a suction stream stabilizer, having an accumulator housing (10) which is provided with two fluid connections (16) between which a deflection device (22) is arranged which has an adjoining housing part (26) which accommodates a separating element which separates the interior (18) of the accumulator housing (10) from an accumulator volume (30). Solutions for long-term and functionally reliable operation can be achieved on account of the separating element being formed from a piston (28) or a bellows (50).

Abstract: The invention regards a hydraulic cylinder (1) or a plug comprising a hydraulic cylinder for operation of anchoring and or sealing devices, where the hydraulic cylinder comprising a cylinder chamber (6), a piston head (4) within said cylinder chamber (6) forming two sub chambers (7, 7?) of said cylinder chamber (6) one on each side of the piston head (4), and a piston rod (5) which runs through the piston head (4) and said two sub chambers (7, 7?) or only one of said cub chambers. The hydraulic power unit (8) for operation of the hydraulic cylinder (1) is situated at least partly within the parts forming the hydraulic cylinder (1) itself, preferably the piston head (4) and or the piston rod (5).

Abstract: To prevent breakage by abnormal deformation when seal function of a seal section becomes ineffective to cause pressurized liquid remaining in the liquid chamber to be lost, a metallic bellows-type accumulator having a metal bellows, a bellows cap, an outer gas chamber and an inner liquid chamber, in a shell is structured to have a bellows constructed such that, when pressure in the liquid chamber (12) is further reduced after the bellows cap (31) is brought into contact with an oil port (4), surface contact sections (35) are formed on the metal bellows (3) and a curvature radius of U-shaped sections (3A) of crest portions (32) at the outer diameter side is reduced, and a curvature radius of U-shaped sections (3A) of root portions (33) at the inner diameter side is enlarged.

Abstract: A reduced weight and repairable piston accumulator. The accumulator includes a load bearing metallic cylinder with removable end caps secured thereto with slip flanges for allowing repairability and for achieving the required cycle life. The cylinder serves as the surface on which the piston slides and is designed such that it sustains the axial stress induced by pressurization of the accumulator. A composite over wrapping is designed such that it sustains the stress in the hoop (radial) direction. A stress transitioning bushing can be provided for transitioning hoop stresses between the overwrap and the slip flange. When combined with the cylinder, the fibers of the composite wrap will not be placed in shear and thus will not fatigue in the same manner as some prior art designs.

Abstract: A lightweight high pressure repairable piston composite tie-rod accumulator that does not use a load bearing metallic liner. An exemplary accumulator includes composite tie rods that sustain the axial stress induced by pressurization of the accumulator, while the shell is designed such that it sustains the stress of pressurization in the hoop direction. The tie rods can be secured using a wedge-type tie rod retention mechanism. As a result, no pretension is applied to the tie rods and the composite shell may be designed entirely for hoop stress.