An annular valve in which the shape of a sealing surface of a valve body is optimized thus suppressing the occurrence of pressure loss in gas on the periphery of the sealing surface and extending the service life of the annular valve. The annular valve comprises: a valve seat 10 formed in a plate-like shape and including passage flow channels 11 each having an opening cross section formed in an arcuate shape; a receiving plate 20 formed in a plate-like shape and having discharge flow channels 21, the receiving plate 20 being arranged to face the valve seat 10 by way of an intermediate chamber 50; a valve body 30 formed in an annular shape corresponding to the arcuate shape of the opening cross section of the passage flow channel 11 and being arranged in the intermediate chamber 50, the valve body 30 being brought into contact with/separated from the valve seat 10 so as to open/close the passage flow channel 11; and a plurality of spring members 40 supported by the receiving plate 20, the spring members 40 each biasing elastically the valve body 30 toward the valve seat 10. A sealing surface 31 of the valve body 30 that faces the passage flow channel 11 is formed in a shape where at least one of pressure loss elements with respect to gas flowing towards the valve body 30 from the passage flow channel 11 is eliminated.

A compressor valve suitable for use in a compressor is provided. The compressor valve comprises a first body member and a second body member. The first body member and the second body member each define a set of suction flow passages in fluid communication with each other between the suction passage and a cylinder of the compressor, and a set of compression flow passages in fluid communication with each other between the cylinder and the discharge passage. The valve includes a suction seal and a compression seal, both located at least partially between the first body member and the second body member. The suction seal is movable between a closed position and an open position. The suction seal is biased to a closed position against the flow of fluid from the suction passage to the cylinder. The suction seal and the compression seal are biased by helical coil springs.

A container main body has a container main body opening portion in one end portion. The lid body is attachable to and detachable from the container main body opening portion and capable of blocking the container main body opening portion. The gas purge port is provided with a seal face provided in at least one of a ventilation path forming portion and a part of the gas purge port other than the ventilation path forming portion and the check valve member and coming into close contact with a gas injection port. The seal face is provided with a close contact pad constituted by an elastic body for preventing gas leakage between the gas injection port and the seal face.

A container main body has a container main body opening portion in one end portion. The lid body is attachable to and detachable from the container main body opening portion and capable of blocking the container main body opening portion. The gas purge port is provided with a seal face provided in at least one of a ventilation path forming portion and a part of the gas purge port other than the ventilation path forming portion and the check valve member and coming into close contact with a gas injection port. The seal face is provided with a close contact pad constituted by an elastic body for preventing gas leakage between the gas injection port and the seal face.

Check valve assembly (1, 1) for a shock absorber (100) comprising a housing (10), said housing (10) comprising a first volume (11), wherein a first pressure (P1) prevails; a second volume (12), wherein a second pressure (P2) prevails; a fluid passage (20) between said first (11) volume and said second (12) volume; and a spool (40) movably arranged in said housing (10) for movement back and forth between an first position, in which a flow of fluid through said fluid passage (20) is allowed, and a second position, in which the spool (40) closes the fluid passage (20). The check valve assembly further comprises a first biasing means (50) configured to bias the spool (40) towards the second position through at least first operational range (OR1) of the spool (40) in which first operational range the fluid passage (20) is open. Also, the check valve assembly comprises a second biasing means (51) configured to bias the spool (40) towards the first position partly through a second operational range (OR2) of the spool (40) in which second operational range (OR2) the fluid passage (20) is closed. The first biasing means forces the spool from its open position at least to its closed position for closing the passage.

Check valve assembly (1, 1) for a shock absorber (100) comprising a housing (10), said housing (10) comprising a first volume (11), wherein a first pressure (P1) prevails; a second volume (12), wherein a second pressure (P2) prevails; a fluid passage (20) between said first (11) volume and said second (12) volume; and a spool (40) movably arranged in said housing (10) for movement back and forth between an first position, in which a flow of fluid through said fluid passage (20) is allowed, and a second position, in which the spool (40) closes the fluid passage (20). The check valve assembly further comprises a first biasing means (50) configured to bias the spool (40) towards the second position through at least first operational range (OR1) of the spool (40) in which first operational range the fluid passage (20) is open. Also, the check valve assembly comprises a second biasing means (51) configured to bias the spool (40) towards the first position partly through a second operational range (OR2) of the spool (40) in which second operational range (OR2) the fluid passage (20) is closed. The first biasing means forces the spool from its open position at least to its closed position for closing the passage.

An annular valve in which the shape of a sealing surface of a valve body is optimized thus suppressing the occurrence of pressure loss in gas on the periphery of the sealing surface and extending the service life of the annular valve. The annular valve comprises: a valve seat 10 formed in a plate-like shape and including passage flow channels 11 each having an opening cross section formed in an arcuate shape; a receiving plate 20 formed in a plate-like shape and having discharge flow channels 21, the receiving plate 20 being arranged to face the valve seat 10 by way of an intermediate chamber 50; a valve body 30 formed in an annular shape corresponding to the arcuate shape of the opening cross section of the passage flow channel 11 and being arranged in the intermediate chamber 50, the valve body 30 being brought into contact with/separated from the valve seat 10 so as to open/close the passage flow channel 11; and a plurality of spring members 40 supported by the receiving plate 20, the spring members 40 each biasing elastically the valve body 30 toward the valve seat 10. A sealing surface 31 of the valve body 30 that faces the passage flow channel 11 is formed in a shape where at least one of pressure loss elements with respect to gas flowing towards the valve body 30 from the passage flow channel 11 is eliminated.

An annular valve in which the shape of a sealing surface of a valve body is optimized thus suppressing the occurrence of pressure loss in gas on the periphery of the sealing surface and extending the service life of the annular valve. The annular valve comprises: a valve seat 10 formed in a plate-like shape and including passage flow channels 11 each having an opening cross section formed in an arcuate shape; a receiving plate 20 formed in a plate-like shape and having discharge flow channels 21, the receiving plate 20 being arranged to face the valve seat 10 by way of an intermediate chamber 50; a valve body 30 formed in an annular shape corresponding to the arcuate shape of the opening cross section of the passage flow channel 11 and being arranged in the intermediate chamber 50, the valve body 30 being brought into contact with/separated from the valve seat 10 so as to open/close the passage flow channel 11; and a plurality of spring members 40 supported by the receiving plate 20, the spring members 40 each biasing elastically the valve body 30 toward the valve seat 10. A sealing surface 31 of the valve body 30 that faces the passage flow channel 11 is formed in a shape where at least one of pressure loss elements with respect to gas flowing towards the valve body 30 from the passage flow channel 11 is eliminated.

A nozzle check valve comprises a valve body (10) and a nozzle (20) centrally arranged within the upstream end of valve body (10), a fluid channel (90) is defined by the outer face of the nozzle (20) and the inner face of the valve body (10). A guide bush (60) is mounted on a nozzle axial extension (26) and an annular disc (30) comprising a disc sealing ring (31) connected to a central barrel (32,33) by a plurality of webs (34) is mounted on the guide bush (60) for axial movement of the annular disc (30) relative to the valve body to open and close the fluid channel (90). A spacer (80) is arranged on the nozzle axial extension (26) downstream of the guide bush (60) and a diffuser (40) is arranged on the downstream side of the spacer (80). A spring (50) between the annular disc (30) and the diffuser (40) urges the disc towards the valve closed position. The stroke of the valve, the maximum movement of the annular disc (30) from the valve closed position to the valve open position where the annular disc (30) is in contact with the upstream face of the diffuser (40), is determined by the axial length of the spacer (80). The centre of mass of the annular disc (30) is located along the central axis of the disc (30) at an axial position where the barrel (32) is in sliding contact with the guide bush (60).

A nozzle check valve comprises a valve body (10) and a nozzle (20) centrally arranged within the upstream end of valve body (10), a fluid channel (90) is defined by the outer face of the nozzle (20) and the inner face of the valve body (10). A guide bush (60) is mounted on a nozzle axial extension (26) and an annular disc (30) comprising a disc sealing ring (31) connected to a central barrel (32,33) by a plurality of webs (34) is mounted on the guide bush (60) for axial movement of the annular disc (30) relative to the valve body to open and close the fluid channel (90). A spacer (80) is arranged on the nozzle axial extension (26) downstream of the guide bush (60) and a diffuser (40) is arranged on the downstream side of the spacer (80). A spring (50) between the annular disc (30) and the diffuser (40) urges the disc towards the valve closed position. The stroke of the valve, the maximum movement of the annular disc (30) from the valve closed position to the valve open position where the annular disc (30) is in contact with the upstream face of the diffuser (40), is determined by the axial length of the spacer (80). The centre of mass of the annular disc (30) is located along the central axis of the disc (30) at an axial position where the barrel (32) is in sliding contact with the guide bush (60).