Abstract: An oil separator and an oil reservoir are formed integral with a main casing. Also, an opening communicated with the oil reservoir is formed in a part of a lower portion of an oil separation space of the oil separator. Preferably, the opening is formed so that its width is increased as it approaches an outer peripheral side of the oil separation space from a center thereof. Further, a safety valve is installed so that a line connecting between the safety valve and the center of the oil separator is made substantially in parallel to axes of screw rotors.

Abstract: A cylinder structure for a pneumatic tool includes a cylinder, a rotor, a front lid, and a rear lid. The cylinder has an eccentric chamber which has an inner wall in a series of different curvature sections connected to form an entire inner wall. The rotor is in touch by its outer edge against the inner wall of the chamber to form a contact surface in a zero distance, and a gap between the outer edge of the rotor and the inner wall of the chamber is gradually increasing towards both sides until an opposite side of the contacting surface.

Abstract: A compressor comprises a compressing mechanism which compresses fluid including a lubricant, a separation chamber into which the fluid compressed by the compressing mechanism is introduced and in which at least a portion of the lubricant included in the fluid is separated from the fluid, and an oil-storage chamber in which the lubricant separated from the fluid in the separation chamber is stored. An oil-introducing passage is formed between the separation chamber and the oil-storage chamber to bring these chambers into communication with each other, the oil-introducing passage introduces the lubricant separated in the separation chamber into the oil-storage chamber, an opening of the oil-introducing passage on the side of the oil-storage chamber is lower than an oil level of the lubricant stored in the oil-storage chamber in the vertical direction.

Abstract: A check valve retainer for a scroll compressor includes a retaining lip that fits into a recess formed in a scroll. The retaining lip may be manufactured as an integral part of the check valve retainer for press fitting or may be formed by an expansion fit locking member having a protrusion that forces a portion of check valve retainer wall into the recess. The retaining lip ensures that the check valve retainer stays attached to the scroll without risking scroll deformation.

Abstract: The present invention mainly includes a valve cock and a valve cock cover to form a structure of check valve, of which a trepan boring is set on the cover to accommodate the valve cock, and a pressure guide hole is set on the cover body to connect the high-pressure and valve cock trepan boring. A blast groove is set on the binding surface of the valve cock cover and shielding seat to release refrigerant. The valve cock is pressed against the vent hole of the shielding seat under the effect of the high-pressure chamber, and then the high-pressure refrigerant is blocked from flowing back into the low-pressure chamber. However, the high-pressure refrigerant will directly eject upward against the valve cock when the rotating turbine and fixed whirl run mutually, in addition the high-pressure refrigerant will flow into the high-pressure chamber via the blast groove.

Abstract: An air motor, especially for a screwer, comprises an air rotor which is rotatably supported in a motor cylinder and comprises a plurality of longitudinal slits extending in the longitudinal direction of the rotor for radially guiding lamellae, the air rotor and motor cylinder having formed thereinbetween chambers which can be brought into communication with an air inlet and/or an air outlet. To achieve a high efficiency of the motor together with a more uniform accelerating power, a reduced sound level and less wear while the exhaust air throttling measures are reduced at the same time, the motor cylinder comprises an inner chamber of an essentially triangular cross-section, one chamber each being formed between air rotor and a triangle tip.

Abstract: In a valve used in connection with a scroll compressor, a central profiled body is designed to protrude in an opening for outlet of gas from a compression stage, a outer axisymmetric surface of which is concave, of generally toroidal shape, and is terminated by a tip, the outlet opening of the compression stage being delimited by a curved surface forming, in the downstream direction, a widening providing, with the central profiled body, a cross section for the passage of the gas which is substantially constant, closing means being provided in order to seal this passage in the closed position of the valve.

Abstract: A hydraulic pump assembly includes a pump housing having a chamber defined therein, wherein the chamber includes a pair of cylindrically shaped portions each defining at least one end wall. The hydraulic pump assembly also includes a pair of rotary pump elements disposed for rotation within the cylindrically shaped portions of the chamber, and which cooperate to create a hydraulic pressure. The hydraulic pump assembly further includes a pair of cylindrically shaped shafts each having at least one end wall, and disposed within the pair of cylindrically shaped portions of the chamber and within the pair of pump elements. The shafts are fixed for rotation and are axially shiftable with respect to the pump elements. A hydraulic fluid within the chamber stabilizes at least one of the axially shiftable shafts such that the end face of the shaft is spaced from the end wall of the cylindrically shaped portion of the chamber when the hydraulic pump is in use.

Abstract: A hydraulic pump assembly includes a pump housing having a chamber defined therein, wherein the chamber includes a pair of cylindrically shaped portions each defining at least one end wall. The hydraulic pump assembly also includes a pair of rotary pump elements disposed for rotation within the cylindrically shaped portions of the chamber, and which cooperate to create a hydraulic pressure. The hydraulic pump assembly further includes a pair of cylindrically shaped shafts each having at least one end wall, and disposed within the pair of cylindrically shaped portions of the chamber and within the pair of pump elements. The shafts are fixed for rotation and are axially shiftable with respect to the pump elements. A hydraulic fluid within the chamber stabilizes at least one of the axially shiftable shafts such that the end face of the shaft is spaced from the end wall of the cylindrically shaped portion of the chamber when the hydraulic pump is in use.

Abstract: A check valve retainer for a scroll compressor includes a retaining lip that fits into a recess formed in a scroll. The retaining lip may be manufactured as an integral part of the check valve retainer for press fitting or may be formed by an expansion fit locking member having a protrusion that forces a portion of check valve retainer wall into the recess. The retaining lip ensures that the check valve retainer stays attached to the scroll without risking scroll deformation.

Abstract: The present invention relates to a compressor and method for operating a compressor comprising a first stage comprising a first stage bypass cavity and a first stage outlet, an intercooling zone in communication with said first stage outlet, a second stage comprising a second stage inlet and a second stage outlet in communication with said intercooling zone, a gearbox disposed proximate to the first stage outlet and the second stage inlet, wherein both stages communicate with the gearbox through their respective rotor shafts, a valve, wherein the valve provides means for communications between the first stage bypass cavity and the second stage during unloaded conditions, and intercooling means operable for injecting cooling fluid into the intercooling zone.

Abstract: A pressure adjuster valve has a body having a communication passage for connecting a first chamber in fluid communication with a second chamber and a truncated conical-shaped valve seat portion disposed at one end of the communication passage. A valve element is disposed within the communication passage for undergoing movement therein to engage the valve seat portion of the body. A biasing member normally biases the valve element in a direction away from the valve seat portion.

Abstract: The closure system according to the invention is intended in particular for plastics immersion pumps which in turn have a pump casing which has a substantially cylindrical casing wall, a detachable casing cover and a locking ring which is intended for closing the casing cover and, in the mounted state, is arranged on the outside of the casing cover and is inserted in an annular groove of the casing wall. According to the invention, the casing cover is provided on its outside with at least two ribs which are arranged in a spoke-like manner and each have an outer projection and with this each expose a groove radially accessible from the outside, and the locking ring is provided with the same number of radially inward projecting tabs. The latter are dimensioned and arranged in such a way that, in the assembled, i.e. operational, state of the pump, they are each inserted in a tightly fitting manner into a groove of the ribs arranged at the end face of the casing cover.

Abstract: A compressor includes a particularly shaped discharge valve which extends into the discharge port. The shaped valve includes a convex portion on the seat side of the valve which extends downwardly into the discharge port. The shaped valve furthermore includes a concave portion on the seat side of the valve that begins where the convex portion ends. The beginning of the concave portion on the seat side of the valve is located so as to prevent flow separation of the refrigerant when flowing along the convex portion of the valve as it leaves the compression chamber of the compressor.

Abstract: In a valve used in connection with a scroll compressor, a central profiled body is designed to protrude in an opening for outlet of gas from a compression stage, a outer axisymmetric surface of which is concave, of generally toroidal shape, and is terminated by a tip, the outlet opening of the compression stage being delimited by a curved surface forming, in the downstream direction, a widening providing, with the central profiled body, a cross section for the passage of the gas which is substantially constant, closing means being provided in order to seal this passage in the closed position of the valve.

Abstract: A compressor assembly includes a shell which defines a discharge chamber. A discharge valve assembly is attached to the shell in communication with the discharge chamber. The discharge valve assembly includes a stamped or coined valve seat, a drawn tubular element and a stamped valve member. The stamping, drawing and coining operations used to manufacture the discharge valve assembly significantly reduce the manufacturing costs for the discharge valve assembly.

Abstract: A suction fitting for a scroll machine is disclosed. The suction fitting is formed by a powder metal suction plate and a cast suction tube. The suction fitting is configured so that the powder metal suction plate is not subject to pressure gradients caused by the compressor.

Abstract: A package-type screw compressor includes a low-pressure stage state compressor and a high-pressure stage compressor. Motive power is transmitted from an electric motor to the two compressors via a speed increaser. The discharge gas, compressed and heated to a high temperature by the low-pressure stage compressor, is cooled by an intercooler. The discharge gas, compressed and heated to a high temperature by the high-pressure stage compressor, is cooled by an aftercooler. A casing of the intercooler and that of the aftercooler are formed integrally with a speed increaser casing, reducing the number of component parts. A cooler portion, formed by the intercooler and the aftercooler, is spaced from the speed increaser casing, thereby preventing heat, produced by the compressed air, from being transmitted to the speed increaser casing.

Abstract: A compressor includes a particularly shaped discharge valve which extends into the discharge port. The shaped valve includes a convex portion on the seat side of the valve which extends downwardly into the discharge port. The shaped valve furthermore includes a concave portion on the seat side of the valve that begins where the convex portion ends. The beginning of the concave portion on the seat side of the valve is located so as to prevent flow separation of the refrigerant when flowing along the convex portion of the valve as it leaves the compression chamber of the compressor.

Abstract: Scroll compressors may preferably include, for example, a stationary scroll, a drive shaft member, a movable scroll, a bearing member, a compression chamber, a discharge port, a discharge valve and a discharge valve clamping device. The drive shaft member may revolve around a revolution axis. The bearing member may be disposed between the movable scroll and the drive shaft member in order to transmit the revolution of the drive shaft member to the movable scroll. The compression chamber may be defined by a space formed between the stationary scroll and the movable scroll. The compression chamber compresses the fluid drawn into the compression chamber when the movable scroll revolves or orbits with respect to the stationary scroll. The discharge port is disposed within the movable scroll and is adapted to discharge fluid within the compression chamber to the opposite side of the stationary scroll. The discharge valve clamping device is preferably affixed to the movable scroll.

Abstract: A discharge valve is provided for implementation between a discharge pressure zone and a discharge chamber. The discharge valve is operable between an open position for enabling fluid flow between the discharge pressure zone and the discharge chamber and a closed position for prohibiting fluid flow between the discharge pressure zone and the discharge chamber. The discharge valve includes a housing defining a cavity and having a flow aperture therethrough. A valve disc is slidably disposed within the housing and is operable for defining the open and closed positions of the discharge valve. The valve disc includes a contoured body for reducing stresses experienced within the valve disc and improving fluid flow therearound.

Abstract: An improved scroll compressor has condition responsive lubricant volume flow. The lubricant is preferably delivered to a tap positioned adjacent the suction chamber such that lubricant is delivered into the scroll compressor in a quantity which is desirable for normal operation of the scroll compressor. A valve is associated with the tap, and restricts the flow of lubricant through the tap to a first more restrictive non-actuated position. If operational conditions within the scroll compressor indicate that a greater lubricant flow would be desirable, the valve moves to an actuated position at which it is less restrictive to the flow of lubricant.

Abstract: A discharge valve is provided for implementation between a discharge pressure zone and a discharge chamber. The discharge valve is operable between an open position for enabling fluid flow between the discharge pressure zone and the discharge chamber and a closed position for prohibiting fluid flow between the discharge pressure zone and the discharge chamber. The discharge valve includes a housing defining a cavity and having a flow aperture therethrough. A valve disc is slidably disposed within the housing and is operable for defining the open and closed positions of the discharge valve. The valve disc includes a contoured body for reducing stresses experienced within the valve disc and improving fluid flow therearound.

Abstract: In a pump housing of a pump apparatus, a pump shaft is rotatably supported by two bearings and is connected to a pump unit. A rotary drive member is fixed to one end of the pump shaft projecting from the tip end portion of the housing. The rotary drive member includes a boss portion fixed to the one end of the pump shaft projecting from the housing, and a rim portion integral with the boss portion. The rim portion is offset from the boss portion to cover at least a portion of the tip end portion of the housing. A groove portion for receiving a drive belt is formed on the outer circumference of the rim portion. The widthwise center plane of the groove portion is located between the respective centers of the two bearings. In place of the groove portion, a tooth portion engageable with a drive gear may be formed on the outer circumference of the rim portion. Preferably, the pump unit is of a balanced vane type.

Abstract: A fluid machinery driven equipment such as a rotary pump has a simple structure and high efficiency with a small size and low cost. The driven equipment includes a tubular casing having an inner surface which is substantially elliptic in shape, a rotor provided in the tubular casing where the rotor having a first arm provided with a rotatable piston at its end and a second arm in perpendicular to the first arm provided with a rotary plate at its end, and a rotary shaft provided in the tubular casing and connected to the rotor where at least one end of the rotary shaft is projected from the tubular casing to be connected to the external force.

Abstract: A compressor assembly includes a shell which defines a discharge chamber. A discharge valve assembly is attached to the shell in communication with the discharge chamber. The discharge valve assembly includes a stamped or coined valve seat, a drawn tubular element and a stamped valve member. The stamping, drawing and coining operations used to manufacture the discharge valve assembly significantly reduce the manufacturing costs for the discharge valve assembly.

Abstract: A sealed compressor includes a lower end cap with a u-shaped hump extending around its periphery. A weld reinforcement which is preferably a ring is welded between inner and outer legs of the u-shaped hump. The weld reinforcement ring bears a good deal of stress from internal pressures, and results in a more long-lasting housing.

Abstract: A reversible pneumatic motor assembly allows forward, reversing and throttling of a pneumatic motor by manipulation of a single lever with one hand. A reversing valve assembly of the motor assembly includes a tilt valve disposed in an inlet passage having a valve seat for receiving the valve to block the inlet passage. Forward and reverse passages extend from the valve assembly to the motor for driving the motor in forward and reverse directions. A shuttle connected to the lever can be moved transversely of the motor assembly.

Abstract: An oscillating-piston engine, comprising a housing, in which several pistons configured as two-armed levers are arranged pivotably, respectively, around a pivot axis being parallel to a central housing axis and moving commonly in a revolution direction. The pistons comprise running surfaces on a side facing away from said housing inner wall, which are guided alongside at least one control cam, when the pistons revolve in the housing, of a centrally housing-fixed cam piece, in order to control pivot movements of the pistons in the revolution. The control cam is configured as an inner contour on the cam piece, alongside of which the pistons are guided supported to a side of a centrifugal force via the running surfaces, The cam piece comprises another inner contour configured as a control cam alongside of which the pistons are guided supported to a direction of the central housing axis via the running surfaces.

Abstract: A compressor assembly includes a shell which defines a discharge chamber. A discharge valve assembly is attached to the shell in communication with the discharge chamber. The discharge valve assembly includes a stamped or coined valve seat, a drawn tubular element and a stamped valve member. The stamping, drawing and coining operations used to manufacture the discharge valve assembly significantly reduce the manufacturing costs for the discharge valve assembly.

Abstract: The invention relates to a pneumatic motor, in which a rotor (16) driven by compressed air rotates in a cylindrical motor sleeve (14). As a replacement for lubrication with compressed operating air containing oil, as, has hitherto been the conventional practice, cavities (28) for accommodating a lubricant ( ) and connecting paths for the transport of the lubricant (30) from the cavities (28) into the motor sleeve (14) are provided in the rotor (16).

Abstract: A venting passage for isolation block of a scroll compressor and a check valve for the same. The compressor mainly comprises a fixed scroll member, an orbit scroll member, and an isolation block. The isolation block has venting passage and the venting passage has a through hole on bottom thereof and communicated with the discharging port of the fixed scroll member. A baffle is provided at top opening of the venting passage to form a muffle room. The venting passage has a floating planar valve. Moreover, the projecting ring has a plurality of venting apertures of window shape on top portion thereof and with even distribution.

Abstract: An improved check valve for a scroll compressor has a stop body which has a contact face which is reduced in surface area to reduce the stiction or holding force holding the valve at shut down. In this way, the valve is allowed to move to its closed position more rapidly.

Abstract: A combination double screw rotor assembly includes a first and a second screw rotor arranged in parallel in a casing, two sets of bearings respectively mounted in the casing near the outlet to support the shafts, and a plurality of locking means respectively fastened to the shafts near the inlet. The first and the second screw rotor each has a low pressure screw rotor element, a high pressure screw rotor element, and a spiral thread formed of a first spiral thread segment at the high pressure screw rotor element and a second spiral thread segment at the low pressure screw rotor element, the first spiral thread segment having an uniform short pitch, the second spiral thread segment having an uniform long pitch, the first spiral thread segment and second spiral thread segment of the first and the second screw rotor being respectively meshed together.

Abstract: An oscillating-piston engine comprises a housing, in which several pistons configured as two-armed levers are arranged pivotably, respectively, around a pivot axis being parallel to a central housing axis and movable commonly in a revolution direction. The pistons comprise running surfaces on their side facing away from the housing inner wall, which are guided alongside at least one control cam when the pistons revolve in the housing, of a centrally housing-fixed cam piece, in order to control the pivot movements of the pistons in revolution. The control cam is configured as inner contour on the cam piece, alongside of which the pistons are guided supported to the side of the centrifugal force via the running surfaces. The cam piece comprises another, inner contour configured as a control cam alongside of which the pistons are guided supported to the direction of the central housing axis via the running surfaces.

Abstract: A fluid machinery driven equipment such as a rotary pump has a simple structure and high efficiency with a small size and low cost. The driven equipment includes a tubular casing having an inner surface which is substantially elliptic in shape, a rotor provided in the tubular casing where the rotor having a first arm provided with a rotatable piston at its end and a second arm in perpendicular to the first arm provided with a rotary plate at its end, and a rotary shaft provided in the tubular casing and connected to the rotor where at least one end of the rotary shaft is projected from the tubular casing to be connected to the external force.

Abstract: An air inlet valve assembly for a rotary scroll compressor is disclosed. The rotary scroll compressor includes stationary and orbiting scroll elements which are intermeshed and nested to form at least one spiraling compression pocket therebetween, a drive mechanism drives the orbiting scroll element in an orbit about the stationary scroll element, and an anti-rotation bearing device maintains the orbiting scroll element substantially non-rotational with respect to the stationary scroll element. The air inlet valve assembly supplies an uncompressed gas (e.g., ambient air) to the compression apparatus and prevents backward rotation of the orbiting scroll element when power to the drive mechanism is terminated. The air inlet valve assembly includes a valve piston positioned within an air intake channel leading to the suction region of the rotary scroll compressor, the valve piston having a first position blocking the air intake channel and a second position unblocking the air intake channel.

Abstract: A fluid machinery driven equipment such as a rotary pump has a simple structure and high efficiency with a small size and low cost. The driven equipment includes a tubular casing having an inner surface which is substantially elliptical in shape, front and rear covers for covering the tubular casing through fastening means, a rotary shaft provided in the tubular casing and is supported by the front and rear covers, and a rotor provided in the tubular casing and connected to the rotary shaft.

Abstract: A compressor includes a normally open discharge valve assembly for controlling compressed refrigerant flow from the discharge chamber through the compression members. This controlling of flow results in an increased performance for the compressor by reducing recompression volume and the elimination of reverse rotation at shut down. The discharge valve assembly includes a valve seat, a valve plate and a valve stop secured within a recess formed within the compressor. The valve stop and the valve seat include a contoured surface which is engaged by the valve plate when it opens and closes. The contoured surface control the movement of the valve plate.

Abstract: In a compressor in which a gas passage is made to have a first and a second end portion opposite to each other and conducts a gaseous fluid from the first end portion to the second end portion, a valve seat member is press-fitted into the first end portion of the gas passage to define a valve chamber in the gas passage. A valve body is movably placed in the valve chamber for checking a back flow of the gaseous fluid only when the valve body is seated on the valve seat member. At the second end of the gas passage, a valve stopper is formed for preventing a displacement of the valve body without closing the gas passage.

Abstract: A scroll compressor has a check valve plate assembly with a reinforcing device to increase the strength of the check valve plate. The check valve plate is stamped from a relatively thin steel reed material. Notched areas are provided during stamping to enable the formation of rolled laterally spaced pins which provide an axis along which the check valve plate may pivot. The reinforcing device is in the form of a slot rolled pin, a spiral rolled pin, or a solid pin, fitted within a bore formed by the rolled laterally spaced pins of the check valve plate. The notched areas of the check valve plate are weakened due to the reduction of the local cross sectional area of the laterally spaced pins. Insertion of the reinforcing device significantly reduces the incidence of cracking that occurs at the notched areas of the check valve plate.

Abstract: In an H/A range in which the ratio H/A≧0.07, where H is the thickness of the bottom wall of a recess (8) provided with a discharge port (4) and a valve seat (9) and formed in the flange (5) of a bearing member (3,3′) and A is the width of the recess (8), the smaller the ratio H/A, the greater is the coefficient of performance (COP). In an H/A range in which H/A<0.07, the COP decreases due to the leakage of the refrigerant resulting from the deflection of the bottom wall of the recess (8) and, eventually, the bearing members (3,3′) are broken. The discharge port (4), the recess (8) and the valve seat (9) are formed so that the ratio H/A≧0.07 and the ratio T/B≦0.3, where T is the thickness of the valve seat (9) and B is the diameter of the discharge port (4). The valve seat (9) can be formed in the thickness T smaller than that of the valve seat of an equivalent conventional compressor, suppressing the deflection of the bottom wall of the recess (8).

Abstract: An impeller (20) for a rotary pump (10) of the type having an impeller with flexible blades, the impeller being removably located in a pump housing (40) having a removable end cover for access to the impeller, the impeller (20) including a drive boss (21) having a screw threaded aperture (80) at a free end to permit insertion of a screw threaded shaft (81) which, when rotated, urges the impeller axially off a drive shaft (30) on which it is mounted in use.

Abstract: A rotary motor using pistons for providing a scalable and more efficient, higher speed engine with improved compression. The rotary motor using pistons includes a main housing having and interior, an inlet port in environmental communication with the interior of the housing, an outlet port in environmental communication with the interior of the housing, a spark plug port for receiving a spark plug also in environmental communication with the interior of the housing, a first plate coupled within the housing and rotatable within the interior of the housing, a second plate member coupled within the housing and rotatable within the interior of the housing, a plurality of pistons coupled to an associated one of the first or second plate members, a drive shaft coupled to one of the first or second plate members and extending out of the housing, and an anti-reverse clutch operationally coupled to the drive shaft.

Abstract: A hydraulic pump includes a pump mechanism having a driven shaft. The driven shaft is connected to an input shaft by a flexible coupling such as a splined connection. A housing extends completely around the driven shaft, and a high-pressure seal is disposed between the housing and the input shaft. A thrust bearing carries hydraulic axial forces on the input shaft to the housing. This arrangement provides balanced hydraulic forces on both ends of the driven shaft, thereby reducing friction and wear.

Abstract: A reversible double-throw air motor utilizes a moveable cylinder casing to switch between forward and reverse operation. The cylinder casing rotates between its forward and reverse positions in response to movement of an externally accessible actuator, via a front bearing plate rotationally coupled to the cylinder casing. The actuator may be biased to the proper position by reaction forces generated within the motor. In some embodiments, the coupling of the front bearing plate to the cylinder casing allows for the cylinder casing to float, thereby enabling the cylinder casing to self-center about the rotor. In other optional embodiments, the front bearing plate is pressed against the cylinder casing during operation by air pressure. The resulting double-throw air motor is easy to use motor and may be economically produced.

Abstract: Several discharge check valve arrangements for scroll compressors move the check valve closer to the discharge port and the compression chambers. This reduces the amount of discharge pressure backflow, and thus reduces the amount of reverse rotation at shutdown. In one type of check valve arrangement, a plug is mounted within a check valve chamber to provide a stop for the check valve. The plug allows the check valve to seat against its valve seat while the compressor is operating to allow gas to flow around the check valve into a discharge plenum. At shutdown, the check valve arrangement is constructed to cause the check valve to rapidly close the discharge port. In other arrangements, the discharge check valve assembly may be mounted in a separator plate as a separate valve plug. This embodiment is similar to an earlier embodiment in the basic operation of the check valve.

Abstract: A valve return passage for quickly returning a valve to a closed position, includes return passages for communicating discharge pressurized fluid to a rear surface of a floating valve. The use of the return passages ensures that pressurized gas is communicated quickly to close the valve at shut down. This reduces the noise of operation of the compressor.

Abstract: A reversible double-throw air motor provides for forward and reverse operation by having a cylinder member rotate relative to a stationary valve plate between fixed forward and reverse positions of the cylinder member. The valve plate has diametrically opposite pressure ports and diametrically opposite exhaust ports at an end surface that faces the cylinder member. The cylinder member has a transfer passage associated with each quadrant of the inner surface, the transfer passages opening at wall ports at the inner surface close to each of the two bottom dead center lines. In the forward position of the cylinder, pressure is supplied from the pressure ports in the valve plate through two of the transfer passages to opposite quadrants while the other two quadrants are open to the exhaust ports in the valve plate. For reverse operation, the cylinder is rotated, which reverses the quadrants open to the pressure and exhaust paths.

Abstract: In scroll-type fluid apparatus in which a flap valve is provided to face a discharge port for discharging a fluid, the flap valve has a bridging portion which is between a supporting portion and a closing portion and has a narrow part narrower than the supporting and the closing portions. The supporting portion is fixed to the apparatus. The closing portion faces the discharge port. A scroll-type transferring mechanism is coupled to the discharge port and transfers the fluid towards the discharge port to discharge the fluid through the discharge port.