A piston pump configured to suction and discharge a working fluid includes a plurality of pistons, a cylinder block accommodating the pistons, a shaft combined with the cylinder block, swash plate configured to reciprocate the pistons in accordance with rotation of the cylinder block, a casing accommodating the cylinder block, and a valve plate placed between the cylinder block and the casing. The valve plate has a suction port providing communication between capacity chambers and a suction passage, and the suction port is a cutout part formed by cutting out an outer edge of the valve plate.

A synthetic resin film is formed on a region of a valve plate (117) which is brought into contact with an arm portion of a suction valve (120) or a region of the valve plate (117) which is brought into contact with an arm portion of a discharge valve (121). With such a configuration, delay in opening of the suction valve (120) or the discharge valve (121) caused by adhesion force of refrigerating oil is suppressed so that a pressure loss in a suction stroke or a discharge stroke can be reduced whereby compressor efficiency is enhanced. Further, a striking sound generated at the time of closing the suction valve (120) or the discharge valve (121) is reduced by an elastic effect of the synthetic resin film so that the reduction of noises is realized.

A valve for a reciprocating compressor having a valve seat with a plurality of flow channels which open into an end face of the valve seat; a valve plate having a planar sealing surface which is designed to control the flow channels of the valve seat and has passage openings which are spatially offset relative to the flow channels of the valve seat, at least one projection being arranged on the end face of the valve seat, which projection projects into a passage opening of the valve plate at least in a closed valve state.

An alternative compressor head arrangement including a valve plate is provided with at least one operating hole. The alternative compressor head arrangement further includes a discharge valve blade provided with at least one operation valve and at least one mounting hole. The alternative compressor head arrangement further includes a stop blade provided with at least one valve stop and at least one mounting hole. The alternative compressor head arrangement further includes a cylinder cap provided with a flange capable of receiving at least one assembly component. The alternative compressor head arrangement further includes a suction valve blade provided with at least one operation valve and at least one mounting. The alternative compressor head arrangement further includes an interface blade provided with at least one mounting hole.

An improved inlet valve system for a cylinder chamber of a reciprocating compressor and a method for utilizing a high pressure gas source to control an inlet valve system for a cylinder chamber of a reciprocating compressor is disclosed. The inlet valve system may include an unloader, a valve assembly including a cylindrical valve body circumferentially disposed about a central axis of the inlet valve system, and a control valve actuator including a control valve body. The valve assembly may include a plurality of inlet valve elements disposed respectively in valve element ports fluidly connected to a control valve passage. A high pressure gas source is utilized to hold open and close the inlet valve elements via the control valve passage in order to control the capacity of the reciprocating compressor.

An air compressor cylinder head includes a valve seat plate, a manifold plate and a cylinder cover that sequentially cover each other; and an inner cavity of the manifold plate is provided with an air channel and a liquid channel. The air channel is provided with a plurality of air inlets and outlets, the liquid channel is provided with a plurality of liquid inlets and outlets, and the air inlets and outlets and the liquid inlets and outlets are distributed on an end face of the cylinder cover, a side wall of the manifold plate and an end face of the valve seat plate.

An unloading device is applied to an air compressor including a plurality of cylinders, and includes: a plurality of unloading valves, each unloading valve movably covering an unloading hole of one cylinder; an unloading cavity in communication with the unloading hole; an intake cavity in communication with the unloading cavity; and a piston member connected to the plurality of unloading valves by means of a shift fork. In an unloading state, the piston member is capable of driving, by means of the shift fork, the unloading valve to move to uncover the unloading hole, so that air in the plurality of cylinders circulates back and forth through the unloading cavity to make the air compressor enter the unloading state, and the air compressor maintains an optimal unloading state by using the intake cavity in communication with the unloading cavity.

A vehicle air compressor comprises a crankcase having a longitudinal central axis. The vehicle air compressor also comprises a head assembly including (i) a rear face that lies in a plane transverse to the longitudinal central axis of the crankcase, (ii) an air inlet port oriented in the same plane as the rear face, (iii) an air outlet port oriented in the same plane as the rear face, (iv) a coolant inlet port oriented in the same plane as the rear face, and (v) a coolant outlet port oriented in the same plane as the rear face.

A multi-gear inflation and deflation device for a swimming pool having an air cavity and a water cavity may include an air pump group, a valve body in fluid communication with the air pump group, and a driving component positioned on the valve body. The valve body may include a valve core rotatably received within the valve body, and the driving component may be configured to drive the valve core between an inflation position, a deflation position, an aeration or massaging bubble position, and a sealed position.

A valve for a reciprocating compressor having a valve seat with a plurality of flow channels which open into an end face of the valve seat; a valve plate having a planar sealing surface which is designed to control the flow channels of the valve seat and has passage openings which are spatially offset relative to the flow channels of the valve seat, at least one projection being arranged on the end face of the valve seat, which projection projects into a passage opening of the valve plate at least in a closed valve state.