This invention relates to the field of internal combustion engines and compressors in general and to linear compressors, in particular these used as in U.S. Pat. No. 8,056,527, by accurately controlling the pressure being delivered into the combustion chambers of said engine while returning unused energy of the compression phase into the motor for complete expansion.

Another improvement relates to a pressure compensated vane to be used inside grooves of the motor assembly rotor. This invention enables the vane to seal against the cavity of the housing tightly with minimal force.

It is disclosed a reciprocating compressor having a cylinder body that defines a cylinder; the cylinder may have a cylinder lateral wall and a cylinder axis A and inside it a piston is movable; at least one valve is provided to selectively open and close a valve opening formed in the cylinder lateral wall; cylinder heads at least partially protruding towards the piston inside the cylinder have a recessed surface at least partially facing the valve openings; an intersection between at least a plane containing the cylinder axis A and the recessed surface is a first curve having at least a convex part facing the valve opening.

An air pump includes a pumping system, a storage tank, a discharge passage, and a valve. The discharge passage includes a first section and a second section wider than the first section. The valve is movable in the discharge passage. The valve, disposed in a first position, includes a first seal end disposed in the first section and abutting a periphery thereof and includes a second seal end disposed in the second section and abutting a periphery thereof. The valve, disposed in a second position, includes the first seal end disengaging from the first section and not abutting the periphery thereof and includes the second seal end disposed in the second section and abutting the periphery thereof. The first and second seal ends respectively have first and second cross-sectional areas. The ratio of the second cross-sectional area to the first cross-sectional area is at least 2 to 1.

A valve actuator is a valve actuator that drives opening and closing of a poppet valve and includes a motor and a transmission mechanism that transmits a drive force of the motor to the poppet valve. The transmission mechanism includes a booster mechanism. The booster mechanism is a three-dimensional toggle mechanism that includes a cylinder, an input disc that rotates about an axis in the cylinder, an output disc that reciprocates along an axial direction in the cylinder, and a link that connects the input disc and the output disc.

A discharge valve assembly includes an outer shell. An inner sleeve is positioned within the outer shell. A side wall of the inner sleeve is spaced from a side wall of the outer shell along a radial direction. A distal end of the side wall of the inner sleeve is spaced from an end wall of the outer shell by a gap along an axial direction. The inner sleeve divides an interior volume of the outer shell into a first muffler cavity and a second muffler cavity. A related compressor is also provided.

A piston for dual-directional hand inflator comprises a main body (1) having an internal hole (11) and an external hole (12). A plurality of spacers (17) are disposed between the top surface and the bottom surface of the main body (1) and divide a space into a gas-intake guide chamber (3) and a gas-exhaust guide chamber (5). The gas-intake guide chamber (3) communicates with the internal hole (11), and the gas-exhaust guide chamber (5) communicates with the external hole (12). A first cover plate (6) is disposed at an end of the gas-intake guide chamber to seal the gas-intake guide chamber. A second cover plate (7) is disposed at an end of the gas-exhaust guide chamber to seal the gas-exhaust guide chamber. There is only two cover plate to be adhered and fixed. The assembly is more convenient and the leakage probability is reduced.

An air compressor for a railway vehicle includes a compressor housing, at least one piston cylinder supported in the compressor housing, the at least one piston cylinder including a cylinder head and a piston, a crankshaft assembly supported by the compressor housing and linked to the piston of the at least one piston cylinder, and an unloader valve positioned on the cylinder head of the at least one piston cylinder. The unloader valve may be configured to exhaust pressurized air from the at least one piston cylinder.

Apparatus configuration in which: a piston (10) is inserted into a housing (1) ascendably and descendably; and pressurized oil supplied to and discharged from a driving chamber (11) arranged above the piston (10). An output rod (15) inserted into an upper wall (2) of the housing (1) protrudes upward from the piston (10). A descent-detecting first detection valve (31) and an ascent-detecting second detection valve (32) arranged outside the periphery of the output rod (15) and in the upper wall (2), circumferentially spaced apart at a predetermined interval. Each first detection valve (31) and second detection valve (32) has an operated portion (49) (79) which faces the piston (10) from above. The apparatus is configured so that pressurized air for detection is supplied through a first supply passage (B1) and a second supply passage (B2) inlets (31a) (32a) of the first detection valve (31) and the second detection valve (32), respectively.

An autolift-resistant piston assembly is provided for an air compressor. The piston assembly comprises an unloader piston having an interior chamber. The piston assembly further comprises a first coil spring for biasing the unloader piston to a loaded position when the piston assembly is installed in the air compressor. The piston assembly also comprises an inner member disposed in the interior chamber of the unloader piston and including (i) a body portion, and (ii) a tapered end portion extending from the body portion and facing an unloader air passage of the air compressor when the piston assembly is installed in the air compressor.

A poppet valve with an integrated dampener is disclosed. In some embodiments, the valve includes a poppet guide with a stem and a hollow poppet is disclosed. The hollow poppet receives the poppet guide stem therein, thereby defining an internal cavity. The poppet is movable relative to the poppet guide to adjust the volume of the internal cavity. The poppet is also moveable relative to a valve seat between a seated position and an unseated position. The poppet may include a body with a seal groove and an elastic seal disposed within the seal groove. The seal is configured to engage the valve seat prior to the poppet body when the poppet moves toward the seated position. The valve may include a poppet guide pivot system that enables pivoting of the poppet guide and the poppet relative to an axial centerline of the valve.