An apparatus for a compressor head assembly with a discharge valve comprises a valve plate having a first face and a second face, wherein at least one cavity is located on the second face and a reed valve assembly sized to be contained in the at least one cavity. The reed valve assembly comprises a reed valve plate with at least one orifice, the reed valve plate selected according to a rated compressor displacement a retainer portion; and a reed retained by the retainer portion proximate to the reed valve plate and oriented to inhibit air flow through the at least one orifice in a closed state. The reed valve assembly is removably secured to the valve plate to facilitate changing the characteristics of the reed valve assembly without changing the valve plate.

The present relation relates to the technological field of compressors. Problem to be solved: The current reciprocating compressors valves arrangements includes valves whose flexion area suffer from direct interference of the body disposed immediately over said valve. Such feature, besides damaging de valve movement, further causes wear phenomena on the flexion areas of the valve, which can result in critical fault of the valve and consequently of the compressor. Resolution of the problem: It is revealed a valve arrange whose end valve capable of moving includes a flexion area previously defined and intentionally misaligned with any contact area of the body immediately disposed over the valve.

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 pump assembly includes a diaphragm pump having a diaphragm extending across a chamber to define a gas chamber on a first side of the diaphragm and a mixture receiving chamber on a second, opposite side of the diaphragm. A shaft extends through the diaphragm and moves therewith between a default position and an extended position. The mixture receiving chamber is configured to receive liquid mixture via a mixture inlet and pass mixture to a pressure chamber via a mixture outlet. The gas chamber has an inlet port receiving gas of a desired pressure and an outlet port. The shaft seals between the inlet port and the outlet port until the diaphragm and shaft are in the extended position at which time gas in the gas chamber passes from the gas chamber to the pressure chamber. The pressure chamber has a pressure outlet configured to deliver a pressurized liquid mixture and gas to a freezing chamber. Each stroke of the diaphragm causes pressurized liquid mixture and gas to be passed into the pressure chamber and to the pressure outlet.

A valve for controlling fluid flow, the valve comprising: a first plate comprising a plurality of first holes extending through said first plate; a second plate comprising a plurality of second holes extending through said second plate, the second holes being substantially offset from the first holes of said first plate; wherein said first plate and said second plate are arranged to form a cavity therebetween in fluid communication with the first holes of said first plate and the second holes of said second plate; and a flap disposed and moveable between said first plate and said second plate, said flap having holes substantially offset from the first holes of said first plate and substantially aligned with the second holes of said second plate; wherein said flap is operable to be motivated between said first and second plates in response to a change in direction of differential pressure of the fluid across the valve; wherein said first plate comprises a coating disposed on a surface of the first plate; wherein the first plate comprises a plurality of clearance regions, substantially aligned with the holes of the flap, in which a thickness of the coating is reduced; and wherein each of the clearance regions defines a respective inner region in which a thickness of the coating is generally greater than its defining clearance region.

A flexible check valve for fluid-handling systems that prevents reverse flow but allows downstream flow of fluid comprises a dome that fits within a pipe and includes a concave surface. The flexible check valve further includes a flexible seat that fits within the pipe and includes a. convex surface. The flexible seat is deformable from a closed position, that prevents reverse flow, to an open position, that allows downstream flow, when an upstream pressure acts on the flexible seat and exceeds a downstream pressure and when, in the closed position, the concave surface of the dome is oriented downstream and the convex surface of the flexible seat is oriented upstream. A housing is connected to the dome and the flexible seat and is connectable to the pipe. A seal is formed between the concave surface and the convex surface when the flexible check valve is in the closed position.

A diaphragm pump with at least one pump chamber, the pump chamber being connected to an inlet chamber via an inlet valve and to an outlet chamber via two outlet valves. The inlet valve having an inlet opening that can be closed by an inlet valve body and the outlet valve respectively having an outlet opening that can be closed by an outlet valve body. The two outlet valves and the inlet valve form a triangle in a projection onto a projection plane transverse to the longitudinal axis of the pump chamber.

A piezoelectric ceramic air pump comprises: a pump body, a piezoelectric ceramic crystal diaphragm, air inlet and output valves, the piezoelectric ceramic crystal diaphragm being co-central-axially mounted on the pump body to construct a working pump chamber for the piezoelectric ceramic air pump; wherein the pump body is approximately tubular, with the diameter being much greater than the axial length, air inlet and outlet ports configured to communicate the working pump chamber with an external air passage are arranged at a position of a peripheral wall of the pump body; an air inlet and outlet component respectively laminates the air inlet and outlet valves onto the air inlet and outlet ports, such that the air inlet and outlet holes are in communication with the air inlet and outlet valves and the air inlet and outlet ports to form air inlet and outlet passages in communication with the external air passage.

A fluid machine includes a piston, a valve seat plate, a valve, and a valve retainer that reduces an opening amount of the valve. One end of the valve retainer is fixed with a fastener together with the valve to the valve seat plate. The fastener spans through the one end of the valve retainer and the valve to thereby fasten the one end of the valve retainer and the valve to the valve seat plate. A second end of the valve retainer that is opposite to the one end does not contact the valve seat plate.

A compact pump includes a case, a diaphragm assembly is disposed in the case at an upper position and includes diaphragm units which form respective pump chambers, and a swing body is disposed in the case at a lower position and moves the plural diaphragm units in the top-bottom direction. The diaphragm assembly has intake valve elements for opening and closing respective air introduction holes. An upper cover of the case has an exhaust hole and ring-shaped recesses. The upper cover has tubular inner wall surfaces defining the respective ring-shaped recesses. The diaphragm assembly includes tubular exhaust valve elements which are disposed in the respective ring-shaped recesses so as to contact with plural respective tubular inner wall surfaces and a rib which is disposed at its center in the vicinity of the exhaust hole and connects center-side outer wall surfaces of the tubular exhaust valve elements.