Abstract: The present disclosure relates to a process connection for connecting a sensor to a process inlet via a process seal and a fixing element. The process connection includes a sensor housing and a clamping element. The sensor housing has a housing body configured to receive the sensor and a housing collar that extends around the housing body and has a first sealing section, which encircles the housing body, and a contact area. The housing collar is formed integrally with the housing body. The first sealing section is suitable for receiving the process seal to connect the process inlet to the housing collar in a fluid-tight manner. The clamping element has a contact area which is suitable for coming into contact with the contact area of the housing collar to press the housing collar onto the process seal.

Abstract: A piston-in-piston hydraulic unit is disclosed that utilises an elastic volume to store and release energy with each stroke by varying the hydraulic fluid volumes in and out of the hydraulic unit.

Abstract: A piston-in-piston hydraulic unit is disclosed that utilises an elastic volume to store and release energy with each stroke by varying the hydraulic fluid volumes in and out of the hydraulic unit.

Abstract: A system for producing mechanical motion is provided. The system includes an actuator having a first end, a second end, and a radially expandable bladder assembly extending therebetween, and a source of pressurized fluid external to said actuator. The bladder assembly further includes an inner cavity. In addition, a substantially fixed-volume reservoir positioned within the cavity is provided, wherein the bladder assembly is configured to expand in a radial direction and contract in an axial direction when a volume of fluid is introduced from the reservoir into the inner cavity.

Abstract: A compact hydraulic cylinder may include a pressure chamber and a reservoir in coaxial, in-line arrangement relative to one another. The pressure chamber and reservoir are separated from one another in use by a piston and hydraulic seal. The piston may be withdrawn to a position in which the pressure chamber and reservoir are in fluid communication through a channel formed in the wall of the cylinder, which may be used for bleeding the pressure chamber. The piston may include a actuator shaft that extends through the reservoir. A follower adjacent the distal end of the shaft seals the reservoir from the exterior of the cylinder.

Abstract: A hydrostatic slewing drive suitable for use in construction equipment, in particular excavators, has a pinion shaft that is rotationally mounted in a housing. A slewing pinion is connected to the pinion shaft. An axial piston motor that utilizes a swashplate construction is in the housing and has a rotating cylinder block with borings and pistons located in the boring. The cylinder block is in one piece with, or integral with, the pinion shaft. The axial piston motor preferably has a constant flow volume, whereby the swashplate is shaped on a housing component. The pistons are supported by slippers on the swashplate which is provided with hydraulic fluid supply channels to which borings in the slippers and in the piston can be connected. The slewing piston can be detachably fastened to the pinion shaft/cylinder block. There is also a brake that can be actively connected with the pinion shaft/cylinder block.

Abstract: A highly manufacturable gas compressor includes a sheath removably attached to a piston by several resilient fingers that snap into place at the bottom of the piston. The fingers act to limit relative motion between the piston and sheath as the piston is reciprocated within a cylinder bore. During the suction stroke of the compressor, the piston and sheath separate at their tops, creating an opening at the top of the sheath which allows low pressure gas to flow through an opening formed in the side of the sheath, between the sheath and piston, through the opening at the top of the sheath, and into a compression chamber formed between the top surfaces of the piston and sheath and the bottom surface of a discharge valve.

Abstract: A master cylinder includes a second piston that is provided with a hollow portion. The hollow portion includes a yoke portion for receiving an end of the second return spring, a cylindrical portion having a diameter that is larger than the diameter of the second return spring, and a tapered portion located at the open end of the hollow portion. The second return spring is disposed within the yoke portion so that the second return spring is coaxially arranged with respect to the second piston. Thus, although the second return spring is capable of moving rapidly to and fro within the hollow portion, the construction of the second piston and the arrangement of the second return spring within the hollow portion of the second piston helps avoid interference between the second piston and the second return spring. Thus, unpleasant noise can be reduced or eliminated. Moreover, small particles that would normally result when the second return spring scratches the second piston are not as likely to arise.

Abstract: A rotary/linear fluid actuator includes a cylinder closed at one end by a rotary actuator and at its other end by a forward housing. A piston is disposed in the cylinder. A hollow piston rod, the forward end of which is closed, extends out of the cylinder through the forward housing. A splined shaft extends into the open end of the piston rod and is coupled to the rotary actuator. The splined shaft includes an axial bore therethrough for delivering pressurized fluid to the piston rod cavity to cause extension of the piston. The piston, cylinder and forward housing define a cavity which is pressurized to cause retraction of the piston. According to the invention, the size of the piston surface can be selected independent of the size of the piston rod cavity actuation surface so that extension and retraction forces, and thereby fluid requirements are independent of one another.

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

Abstract: A closing mechanism of an injection molding machine has a piston-cylinder unit to be pressurized hydraulically. Two partial strokes can be carried out in the unit, of which the first can be run through faster than the second. A displacement tube (7) extends into a main cylinder chamber (6) and into an inner cylinder chamber (4) of a piston (2) of the piston-cylinder unit. The displacement tube (7) is fastened to an end wall of the main cylinder (1) and is open at its free end. The piston (2) is designed as a plunger and is spaces on all sides from the cylinder wall (5) of the cylinder (1) of the piston-cylinder unit. The piston (2) is guided in a flanged gland (15) which is screwed to the cylinder (1).

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

Abstract: A hydraulic cartridge suitable for releasing stores in aircraft relies on a ressurized piston rod which extends upon release of hydraulic pressure. The piston rod is enclosed in a cylinder and connected to a source of hydraulic fluid. Upon arming of the piston rod a hydraulic liquid is pumped into the piston rod and forces out a gas via an accumulation piston. Upon complete filling of the piston rod, a trigger is held in place by the pressurized fluid. Upon release of pressure, the pressure on the trigger becomes unbalanced and a spring releases the trigger from the piston rod permitting it to extend.

Abstract: The machine tool provided with a machine frame adapted to be attachable to a stand, a pneumatic cylinder for reciprocating a quill on the machine frame, and a feed control device for controlling the forward moving speed of the quill comprising a hydraulic cylinder which is parallelly disposed to the quill and includes a piston assembly having a projecting portion engageable with the quill and a liquid tank. The quill is moved, until it is engaged with the projecting portion in the forward moving thereof, at a rapid feed speed and after the engagement at a controlled feed speed by the feed control device. The liquid tank has a pair of openings arranged such that either one of the two may constantly come under the liquid surface in the tank no matter in what posture the machine frame may be attached to the stand.

Abstract: A hydraulic brake booster includes a housing which defines a pressure chamber and a piston within the housing is movable in response to pressurized fluid within the pressure chamber to effectuate a brake application. The piston encloses a storage chamber and forms a passage communicating the storage chamber with the pressure chamber. A valve member is disposed within the passage to control communication between the storage chamber and the pressure chamber. An operator actuator cooperates with a control valve to communicate pressurized fluid to the pressure chamber and a finger is actuated by the operator actuator to engage the valve member, thereby opening communication between the storage chamber and the pressure chamber. The valve member comprises a unitary assembly having a sleeve sealingly engaging the wall of the piston passage, a seat member biased into engagement with a shoulder defined by a stepped bore on the sleeve, and a stem extending through a bore on the seat member.

Abstract: A hydraulic brake booster provides a housing within which a spool valve is slidably mounted. The housing forms a pressure chamber and the spool valve is movable from a first position venting the pressure chamber to a second position, communicating the pressure chamber to a fluid pressure source as the spool valve moves toward the second position. A piston or cylindrical accumulator is also slidably mounted in the housing and moves in response to pressurized fluid in the pressure chamber to actuate braking. In order to hydraulically actuate braking when the pressure source is disabled, the piston includes a storage chamber within which pressurized fluid from the pressure chamber is stored. With the source disabled an operator actuating means moves the spool valve to the second position to close the pressure chamber to the pressure source.