Abstract: A liquid storage tank includes a housing, a piston located in the housing, a cover, an elastic element, and an outlet pipe. The cover is attached to the housing and has a support post extending toward the piston. The piston, the housing, and the cover define a tank chamber. The tank chamber is filled with cooling liquid. The elastic element is connected with the tank hosing and the piston. The elastic element is free from contact with the cooling liquid. The outlet pipe communicates with the tank chamber. An extension direction of an opening of the outlet pipe is not parallel to a direction of movement of the elastic element. When the cooling liquid is decreased, the piston compressed the tank chamber such that the elastic element is released. The tank chamber is continuously compressed by pairing the elastic element and the piston.

Abstract: Systems, methods, and apparatuses for operating a machine using energy stored in a compress gas are disclosed. Energy stored in the compressed gas may be used to pressurize a fluid, such as transmission fluid, and the pressurized fluid may be used to effectuate an operation of the machine, such as a transmission, and the operation of the machine may involve shifting of a transmission. The gas may be compressed with another fluid that is different from the fluid used to operate the machine, and the two fluid may be prevented from being mixed together.

Abstract: A piston-type water hammer absorber comprising: a cylinder body, a plug assembly and a piston; wherein a receiving cavity is formed in the cylinder body, and the piston is movably blocked in the receiving cavity; one end of the cylinder body is provided with a first opening and the other end is provided with a second opening, the first opening and the second opening respectively communicate with two ends of the receiving cavity, and an end of the cylinder body corresponding to the first opening is provided with a limiting part; and the plug assembly blocks the second opening, and a sealed cavity is formed between the plug assembly and the piston.

Abstract: A water arrestor valve assembly permits the servicing and/or replacement of a water hammer arrestor in a segment of a plumbing system. The water hammer arrestor can be isolated from the incoming and outgoing water supply by a valve or a tee-shaped valve body. In addition, the bleeder drain valve(s) can be located on the tee-shaped valve body to reduce the pressure and drain fluid before removal of the water hammer arrestor and can also be used to isolate, reduce the pressure and drain the length of piping of the fixture/appliance that is downstream of the water hammer arrestor.

Abstract: A wearable electronic device is disclosed. The device can include a support structure and an electronic component disposed in or on the support structure. A heat exchanger element can be thermally coupled with the electronic component, the heat exchanger element comprising a fluid inlet port and a fluid outlet port. A first conduit can be fluidly connected to the fluid inlet port of the heat exchanger, the first conduit configured to convey, to the heat exchanger, liquid at a first temperature. A second conduit can be fluidly connected to the fluid outlet port of the heat exchanger, the second conduit configured to convey, away from the heat exchanger, liquid at a second temperature different from the first temperature.

Abstract: A thermal insulation article includes a thermally insulating pad shaped to be positioned in a cavity of a rectangular prism shipping container. The pad includes a solid compostable panel formed primarily of starch and/or plant fiber pulp that holds together as a single unit, and a water-proof or water-resistant film forming a pocket enclosing the panel. The panel includes a first section, a second section, and a third section connecting the first section to the second section, the first and second section each having a central portion and two flaps that extend from the central portion beyond the third section, and wherein the panel is foldable into an open box.

Abstract: An accumulator includes: a main cylindrical housing having a closed first axial end and a second axial end; a piston arranged in the main cylindrical housing and sealed to an inner surface of the main cylindrical housing, which piston is movable in an axial direction and provides with the main cylindrical housing and the closed first axial end of the main cylindrical housing a variable accumulating space; an urging device arranged between the piston and the second axial end of the main cylindrical housing for urging the piston towards the first axial end of the main cylindrical housing; a fluid supply opening arranged in the first axial end of the main cylindrical housing, which fluid supply opening is in fluid connection with the variable accumulating space; and a protective cylindrical housing having a first and a second axial end, the protective cylindrical housing being arranged concentrically.

Abstract: A button for setting and dispensing a dose of a drug from a drug delivery device is described. The button comprises a plastic component and a metal component, wherein the plastic component is at least partly received by the metal component, and wherein the metal component is configured to be manipulated by a user for setting and dispensing the dose. Furthermore, a method for assembling a button for a drug delivery device and a drug delivery device comprising the button are described.

Abstract: An accumulator piston configured to be situated within an accumulator bore of a housing for use in vehicle transmissions. The accumulator piston including a casing, the casing including a top surface, a bottom surface opposite the top surface, and a side wall situated between the top surface and the bottom surface, a pin guide protruding from the top surface of the casing, the pin guide including a centrally disposed aperture, the aperture configured to receive an elongated pin, and a sealing member encircling the side wall of the casing such that the sealing member covers any exposed surface of the side wall.

Abstract: An accumulator includes a pressure vessel and a partition portion separating an interior space of the pressure vessel into a liquid chamber and a gas chamber so that a volume ratio between the liquid chamber and the gas chamber in the pressure vessel is variable. The pressure vessel includes a first section including a thread portion for fastening the accumulator to a support member and a second section joined to the first section and formed by a single piece including a tool engagement portion capable of engaging with a tool for rotating the accumulator. The first section and the second section are fitted together by mating portions coaxial with the thread portion and the tool engagement portion.

Abstract: Provided is an accumulator for easier maintenance of a metal bellows. The accumulator includes a housing having a shell provided with an opening portion and a disk-shaped base body to which one end of a metal bellows with an outside diameter smaller than the inside diameter of the opening portion is welded and fixed, the interior of the housing partitioned on the inside and outside of the metal bellows in a tightly closed manner, in which the base body is formed to have an outside diameter greater than the outside diameter of the metal bellows, and the base body is fixed detachably to the shell.

Abstract: A pressure compensated sensing system and methods for using the same are provided. The system can include a housing, a seal, an incompressible fluid, and sensing elements. The seal can be positioned within a housing cavity and divide the cavity into two portions. A first cavity portion can be sealed from the fluid environment by the seal and contain the sensing elements and the incompressible fluid. A second cavity portion can be in fluid communication with the fluid environment. The fluid environment can apply an external pressure to the seal that is opposed by an internal pressure of the sealed cavity applied to the seal by the incompressible fluid. When the internal pressure and the external pressure are different, the seal can move in a manner that changes the volume of the sealed cavity by an amount sufficient to equalize the internal pressure with the external pressure.

Abstract: An apparatus includes a bootstrap accumulator having multiple fluid expansion volumes each configured to receive fluid. The bootstrap accumulator also includes a piston assembly configured to move within the fluid expansion volumes based on pressures within the fluid expansion volumes. The piston assembly includes (i) a fluid pathway that couples the fluid expansion volumes and (ii) a bypass valve configured to selectively open or block the fluid pathway. The piston assembly could also include multiple pistons and a connecting rod coupling the pistons. The fluid pathway could include a narrower path through a first portion of the connecting rod and a wider path through a second portion of the connecting rod. The bypass valve could include a ball and a spring configured to push the ball to block the narrower path through the first portion of the connecting rod.

Abstract: A hydropneumatic piston accumulator has an accumulator housing (1) defining a housing longitudinal axis (11) and a piston (9) longitudinally movable between two housing covers (5, 7) positioned opposite each other. In the housing (1), the piston (9) separates a working chamber (13) for a compressible medium, such as a working gas, from a working chamber (15) for an incompressible medium, such as hydraulic fluid. A piston part (55) of a displacement measurement device continuously determines each position of the piston (9) in the housing (1). A rod-shaped guide (29, 57) is stationarily positioned in the accumulator housing (1) and passes all the way through the piston (9) in each of its displacement positions in the accumulator housing (1). The piston (9) is movably guided along the guide until it reaches the stop on one of the two housing covers (5, 7) and is sealed against this guide (29,57) using a sealing device (49, 50).

Abstract: A hydropneumatic piston accumulator has an accumulator housing (1) with a cylindrical tube (3) defining a longitudinal axis (11). The cylindrical tube (3) is closed at both ends by housing covers (5, 7). A piston (9) is longitudinally movable in the cylindrical tube (3) and separates a working chamber (13) for a compressible medium from a working chamber for an incompressible medium. A displacement measuring device determines the position of the piston (9) in the housing in a contact-free manner. The displacement measuring device includes a non-magnetic measuring tube (29) extending along the longitudinal axis (11) from one housing cover (5) to the other housing cover (7) and through a passage (31) formed in the piston (9) and is sealed against the interior of the housing (1). In the tube (29), a position sensor (57) is movably guided and follows the piston movements in the measuring tube (29) using a magnetic force acting between the piston sensor (57) and the piston (9).

Abstract: A device for controlling an opening forming an air inlet or air outlet in an outer skin of a vehicle. The device comprises a multiple-member inlet ramp, which is configured to vary at least one of a degree of opening of the opening and a cross section of an air duct connected to the opening; an actuator, which is coupled to the multiple-member inlet ramp and is configured to move the multiple-member inlet ramp into a shape related to at least one of a certain degree of opening and a certain cross section; and a movement control device, which is configured to control a movement of the multiple-member inlet ramp.

Abstract: A system for feeding and pumping of less pumpable material in a conduit line (28) is disclosed, comprising at least one main pump (10) for feeding of said less pumpable material into the conduit line (28), and a receiver unit (50) for receipt of the less pumpable material from the conduit line (28), wherein one or more independent driven compensators (40) are included in the conduit line (28) to maintain stable flow, said one or more compensators (40) being a fillable chamber (14;70) adapted to controllably being pressurized for additional feeding of the material through the conduit line.

Abstract: An accumulator piston configured to be situated within an accumulator bore of a housing for use in vehicle transmissions. The accumulator piston including a casing, the casing including a top surface, a bottom surface opposite the top surface, and a side wall situated between the top surface and the bottom surface, a pin guide protruding from the top surface of the casing, the pin guide including a centrally disposed aperture, the aperture configured to receive an elongated pin, and a sealing member encircling the side wall of the casing such that the sealing member covers any exposed surface of the side wall.

Abstract: A high-pressure vessel includes: a body portion formed in an open cylindrical shape; a cap, at least a part of the cap being inserted inside an opening of at least one end portion of the body portion to thereby plug the end portion; a first reinforcement layer provided at an outer peripheral surface of the body portion and configured by fiber-reinforced plastic having a fiber direction that coincides with a circumferential direction of the body portion; and a second reinforcement layer configured by fiber-reinforced plastic including fibers that pass through a center portion of the cap, as seen in the axial direction of the body portion, and that are disposed parallel to the axial direction of the body portion, as seen in a direction orthogonal to the axial direction of the body portion.

Abstract: A pressure relief device is applied to a liquid cooling system. The pressure relief device includes an exhaust valve and a valve seat. The valve seat is connected with the exhaust valve to form a chamber. The valve seat has an inlet, an outlet and a protrusion. The inlet and the outlet are individually communicated with the chamber. The protrusion is located at the bottom of the valve seat and protrudes toward the exhaust valve. A liquid cooling system with the pressure relief device is also disclosed.

Abstract: A reservoir includes first and second chambers, and a piston having first and second ends disposed in the first and second chambers, respectively. The first and second ends isolate a first area from a second area within the first and second chambers. The first area of the first chamber is in fluid communication with a high pressure fluid source and the second area of the first chamber is in fluid communication with a low pressure fluid source. An orifice is formed in the first end and is configured to allow fluid communication between the upper and lower areas of the first chamber. A pumping system and an aircraft are also disclosed.

Abstract: A device for arresting a shock wave in a fluid in a pipe assembly. The device includes a base, body, and piston. The base has a connector portion with a first opening into an interior. The connector portion is configured to be coupled to the pipe assembly and allow the fluid to flow into the interior through the first opening. The body has an open end opposite a closed end and a channel that extends from the open end into the closed end. The open end is positioned inside a second opening into the interior of the base. Together the base and body form a housing in which the piston is positioned. The piston is slidable within the housing from a resting position to a compressing position when the shock wave travels through the pipe assembly. The piston compresses a gas inside the housing when in the compressing position.

Abstract: The present disclosure relates to a variable pressure vessel. The vessel includes a liquid chamber and a gas chamber and a moveable barrier therebetween. The vessel has a volume, a first stroke, and a second stroke. The liquid chamber and the gas chamber each have a variable volume that changes responsive to the first stroke and the second stroke. The gas chamber has an outer wall wherein at least a portion of the outer wall is thermally conductive and allows heat to transfer therethrough. Movement of the moveable barrier between the liquid chamber and the gas chamber causes the volume in the liquid chamber and the volume in the gas chamber to displace each other. The volume in the gas chamber plus the volume in the liquid chamber is generally constant and generally equals the volume in the variable pressure vessel.

Abstract: Presented herein are systems and methods that allow for adapting at least one dimension of an accumulator in a hydraulic system when faced with certain dimensional constraints and to vary the compliance or stiffness of an accumulator.

Abstract: An electrohydraulic system for use at great water depths includes a vessel, a hydrostatic machine, and an electric machine. The vessel has an interior space configured to form a volume that is closed off with respect to the surroundings and that accommodates a hydraulic pressure fluid. The vessel includes a compensation piston configured to subject the hydraulic pressure fluid in the interior space to at least approximately the pressure prevailing in the surroundings. The hydrostatic machine is configured to be operated as a pump. The electric machine is mechanically coupled to the hydrostatic machine and operates as an electric motor in order to operate the hydrostatic machine as a pump. The hydrostatic machine and the electric machine are arranged in the interior space of the vessel. The compact electrohydraulic system fits on existing installations and on new installations. The electrohydraulic system also includes a compact process valve.

Abstract: A hydraulic accumulator includes a limiting portion that is fitted into a ring end gap of a snap ring to limit a decrease in a diameter of the snap ring. The snap ring is stamped from a metal sheet by a press machine. Therefore, one of two opposed surfaces of a portion of the snap ring, which is fitted into a groove, forms a sloped surface as a result of shear droop. The limiting portion is fitted into the ring end gap of the snap ring to limit the decrease in the diameter of the snap ring. Thus, it is possible to limit riding of the sloped surface of the snap ring on a corner of the groove, and thereby it is possible to limit removal of the snap ring from the groove.

Abstract: A hydraulic system is provided to reduce a dead volume when pressurizing gas. The system includes a gas source, a gas output, a pressure vessel coupled to the gas source and the gas output, a hydraulic system that forces hydraulic fluid into the pressure vessel from the gas source to compress gas, and an overflow tank that receives overflow of hydraulic fluid once all gas has been expelled from the pressure vessel via the gas output.

Abstract: A piston accumulator has a dividing piston (22) inside an accumulator housing (2) that separates a chamber (28) containing a working gas, such as nitrogen, from a chamber (26) containing a working fluid, such as hydraulic oil. The dividing piston (22) is longitudinally movably guided in a guide tube (24). The guide tube (24) is arranged inside the accumulator housing (2) and extends at least partially along the housing longitudinal axis (10).

Abstract: The invention relates to the automatic reloading of the gas space of a hydropneumatic accumulator. An apparatus for readjusting the load of the gas space includes a pressurized gas source connected via an air system to a loading check-valve and a reinjection valve controlled by a unit for calculating a cycle for reinjecting gas into the gas space.

Abstract: A male member and tool changer for downsizing and preventing damage to proximity sensors; a male member includes a cam adapted to pivot between an engagement position at which the cam engages with a lock pin of a female member and a disengagement position at which the cam moves out of the engagement, and a cylinder unit adapted to pivot the cam between the engagement position and the disengagement position. A first proximity sensor and the second proximity sensor are assembled onto a cylinder sidewall of the cylinder unit and first and second detection surfaces of the proximity sensors are revealed in a cylinder chamber. The first detection surface is placed at a position facing on a piston when the cam is located at the disengagement position and the second detection surface is placed at a position facing on the piston when the cam is located at the engagement position.

Abstract: A magnetic pressure pulse attenuator can include a variable volume and at least two magnetic devices. A magnetic force between the magnetic devices varies in response to a pressure change in the volume. A fluid system can include a fluid volume with a variable pressure therein, and a magnetic pressure pulse attenuator including a variable volume in communication with the fluid volume. The variable volume can vary in response to a pressure variation, and the attenuator can further include a magnetic actuator which increases a magnetic force in response to an increase in the pressure. A method of attenuating pressure pulses in a fluid system can include connecting a variable volume of a magnetic pressure pulse attenuator to a fluid volume of the fluid system, the attenuator including a magnetic actuator which generates a magnetic force, and the force increasing in response to a pressure increase in the variable volume.

Abstract: Disclosed herein is a three-stage hydraulic actuator. The three-stage hydraulic actuator includes a pressurizing chamber, a distribution chamber and an acceleration chamber. The pressurizing chamber has therein separated spaces respectively charged with compressed gas and compressed oil. The distribution chamber is provided to communicate with the pressurizing chamber and is charged with oil pressurized by the compressed oil charged into the pressurizing chamber. The acceleration chamber communicates with the distribution chamber through a distributing orifice. An acceleration piston is installed in the acceleration chamber and is moved forward when the pressurized oil is supplied from the distribution chamber to the acceleration chamber.

Abstract: A subsea drilling system with a subsea component controllable by a fluid supply source. The system includes a pressure dampener in fluid communication between the fluid supply source and the subsea component. The pressure dampener includes a body consisting of a dampener fluid flow path which consists of a volume and a biasing system. The biasing system includes a piston biased to an initial position, wherein the piston is configured to move from the initial position to expand the volume of the dampener fluid flow path and dampen a pressure surge received by the pressure dampener and wherein the biasing system is configured to contract the volume of the dampener fluid flow path by returning the piston toward the initial position after dampening the pressure surge.

Abstract: A (collar-equipped) piston and a piston-equipped assembly for a hydraulic unit or a piston-cylinder device of a vehicle braking system, includes a contact surface for a sealing collar, which has a shape curving away from the sealing collar, formed on the piston, so that the sealing collar is pressable, at least partially, into a displacement volume, which is spanned by the contact surface of the piston, with a pressure which is present on a side of the sealing collar directed away from the piston. Also described is a hydraulic unit and a piston-cylinder device for a vehicle braking system, and a vehicle braking system. Further described is a manufacturing method for a piston for a hydraulic unit or a piston-cylinder device of the braking system, and a manufacturing method for a piston-equipped assembly for a hydraulic unit or a piston-cylinder device of the braking system.

Abstract: A system for stabilizing pressure fluctuations in a hydraulic line of a hydraulic circuit includes a hydraulic vessel coupled to the hydraulic line; a separator element disposed within the vessel to define a first fluid chamber and a second fluid chamber within the vessel; and a relief valve disposed in communication with the second fluid chamber of the vessel. The vessel includes a first fluid receivable in the first fluid chamber from the hydraulic line and a second fluid that is disposed within the second fluid chamber. The separator element is moveable within the vessel in response to a volume change of the first fluid received from the hydraulic line. The relief valve is configured to selectively release the second fluid from the vessel in response to a pressure of the first fluid exceeding a pre-determined amount of pressure within the hydraulic vessel.

Abstract: A poppet valve system that includes a valve body having a first and second end and defining a valve cavity and a poppet assembly extending from the first end to the second end and through the valve cavity. The poppet assembly can include a movable poppet head disposed at the first end of the poppet assembly and configured generate a seal by contacting a portion of the valve body and configured to define an opening between the valve cavity and a pressure cavity. The poppet assembly can also include a movable guiding element disposed at the second end of the valve body and a shaft extending from the first end to the second end and coupled to the poppet head and guiding element.

Abstract: A water hammer arrester having a cap assembly, a piston assembly, a pair of o-rings, and a base assembly, wherein the cap assembly, piston assembly and base assembly are made from plastic.

Abstract: The present subject matter relates to improved damping fluid mount devices, systems, and methods in which a damping fluid mount (100) includes an inner member (110), an elastomer section (130) that is affixed to an outer surface of the inner member (110), and a cup (200) containing viscous fluid (300). The elastomer section (130) has an outer diameter that is variable along an elastomer contour, and a crimped portion of the cup is radially crimped into the elastomer section (130) such that the crimped portion precompresses the elastomer section (130) and substantially mimics the elastomer contour.

Abstract: The present invention is a distributed piston elastomeric accumulator which stores energy when its elastomeric member stretches from its original length in response to the flow of a pressurized fluid. The stored energy is returned when the fluid flow is reversed and the accumulator discharges the fluid as its elastomeric member returns to its original length and moves the piston to its initial position. At least one part of the novelty of the invention is that the accumulator is not subject to radial strain gradients and the accumulator allows for precise pressure and linear position measurements. Accordingly, the invention allows for optimization of the energy strain storage capacity of a given elastomer.

Abstract: A system for storing energy includes a body and a shaft having walls defining an internal volume for containing a fluid, a seal member disposed between the body and the walls of the shaft, and a fluid passage in fluid communication with the shaft. The body is disposed within the internal volume of the shaft for movement with gravity from a first elevation position to a second elevation position within the internal volume of the shaft. The seal member divides the internal volume into a first portion located below the body and a second portion located above the body. The fluid passage communicates fluid with the first portion of the interior volume of the shaft. The system further includes a pump/turbine operatively coupled with the fluid passage to drive a motor/generator to generate electricity upon movement of the body from the first elevation position to the second elevation position.

Abstract: A pressure reducing valve has a seal member, which is mounted on a side wall of a piston. The seal member is arranged between a first ring and a second ring. Consequently, depending on the direction of displacement of the piston, the first ring or the second ring is positioned on one of a displacement direction upstream side or a displacement direction downstream side of the seal member. The first ring and the second ring are made of a resin material, for example a polytetrafluoroethylene resin or a polyetheretherketone resin, having lower coefficient of friction compared with that of the seal member.

Abstract: An air spring assembly including a damper that extends into an air cylinder float, the damper including a rod positioned having an end affixed to an end cap of the air cylinder float, a first piston affixed to the rod within the damper, a second piston affixed to the damper and having one or more seals on an outer surface thereof that sealingly engage an inner surface of the air cylinder float, wherein when a load applied to the air spring assembly is increased, the second piston and the second end of the damper move towards the end cap compressing air within the air cylinder float, wherein the air cylinder float is a solid member that does not expand as the air pressure within increases during compression, and wherein a protective membrane is positioned on an outer diameter of the air cylinder float.

Abstract: A device (1) adjusts a media pressure relative to an ambient pressure defined by a depth-dependent sea water pressure during use of the device (1). The sea water pressure acts on a compensator device (35) that permits a reversible change in length or elongation. At least two compensator elements (41) of the compensator device (35) are provided in series in the direction of the change in length or elongation.

Abstract: The present invention is a new and improved bladder for use with a piston accumulator apparatus, system and method of using same that provides a dispersion tube in the bladder to allow fluid to be communicated under a vacuum from the bladder to the accumulator seawater chamber and back again.

Abstract: An in-line water hammer arrester comprises a housing connectable at each end to a piping system, a fluid channel disposed within the housing to permit fluid to flow from the piping system through the housing and back into the piping system, a piston and a pressurized chamber. When a pressure spike occurs, the piston is pushed against the pressurized chamber allowing an expanded area for water flow until the pressure spike is dissipated and the piston returns to its resting position. When used with flexible hoses and tubing typically found with household appliance water supply lines, the in-line arrester is easily installed by a crimping or clamping type connector and takes up little space.

Abstract: A hydraulic servo-control of a servo-controlled gearbox comprises hydraulic actuators defining chambers, a storing tank containing control fluid used by the actuators at room pressure, a hydraulic accumulator containing control fluid under pressure, a motor pump drawing the fluid from the tank and feeding it under pressure to the accumulator, and solenoid valves selectively connecting the chambers to the tank and accumulator. The accumulator includes an outer housing defining an inner cylindrical surface defining a first diameter, a piston arranged and axially slidable and mobile inside the housing and defining there a first variable-volume chamber for a gas and second variable-volume chamber for the fluid under pressure, and a limit stopper arranged at an open end of the housing, acting as a striker for the piston, and having an annular circlip defining an opening and overall second diameter approximating by excess the first diameter of the surface of the housing.

Abstract: The present invention provides a hydraulic pressure accumulator having a pressure vessel and a piston chamber that is located within the interior space of the pressure vessel. In one particular embodiment, the invention relates to filament wound composite overwrapped hydraulic pressure accumulators with serviceable pistons.

Abstract: A pressure accumulator for a camshaft phaser of an internal combustion engine, including a housing that accommodates a piston and forms a cavity fillable with a hydraulic fluid. The cavity is configured as a hole and is closed by a cover on at least one side so as to be fluid-tight, whereby the cover is fastened to the housing by a flanged connection. A method for the production of a pressure accumulator for a camshaft phaser, including a pressure accumulator that forms a cavity, whereby a piston is placed into the cavity, and subsequently, a cover is put in place over the cavity—sealing it off towards the outside—in such a way that a material portion of the housing or of the cover creates such a positive connection between the cover and the housing that the cover is affixed in its position relative to the housing.

Abstract: An accumulator for hydraulically actuating subsea equipment includes a hydraulic fluid chamber and a gas chamber. The hydraulic fluid chamber is in fluid communication with the subsea equipment and comprises a hydraulic piston slidably received, at least partially, within the hydraulic chamber. The gas chamber comprises a charge piston slidably received within the gas chamber, the charge piston dividing the gas chamber into a first portion and a second portion. The first portion of the gas chamber is configured to receive ambient hydrostatic pressure therein, and the second portion of the gas chamber is configured to receive precharge gas therein.

Abstract: An in-line water hammer arrester comprises a housing connectable at each end to a piping system, a fluid channel disposed within the housing to permit fluid to flow from the piping system through the housing and back into the piping system, a piston and a pressurized chamber. When a pressure spike occurs, the piston is pushed against the pressurized chamber allowing an expanded area for water flow until the pressure spike is dissipated and the piston returns to its resting position. When used with flexible hoses and tubing typically found with household appliance water supply lines, the in-line arrester is easily installed by a crimping or clamping type connector and takes up little space.