A pump includes a vibrating plate, a flow path forming member, a pump chamber, and a film valve. The vibrating plate is provided with a piezoelectric element, vibrates due to distortion of the piezoelectric element, and has a gap on an outer periphery. The flow path forming member is disposed so as to face the vibrating plate, and has a hole in a portion facing the vibrating plate. The pump chamber is surrounded by the vibrating plate and the flow path forming member, and has a central space communicating with the hole and an outer edge space communicating with the gap. The film valve is disposed in the pump chamber. The film valve is in contact with the vibrating plate and the flow path forming member when a pressure in the central space is lower than a pressure in the outer edge space.

A micro water pump capable of controlling flow precisely includes an upper cover, a valve seat, a water capsule seat, a base casing, a water capsule, a crank lever, a drive shaft, an eccentric wheel, a motor, a photoelectric switch, and an output circuit board. The output circuit board is electrically connected with an external motor controller. Through the photoelectric switch to detect the revolution of the motor and to cooperate with the external motor controller, the revolution of the motor control can be controlled precisely so as to get a stable water flow under different volumes and back pressures.

Cylinder head cover (8) for a coolant compressor, wherein the cylinder head cover (8) is attachable to the cylinder head arrangement (21) in order to form a hollow space for receiving a coolant compressed by the piston, wherein the cylinder head arrangement (21) comprises a valve plate (9) attached to the cylinder housing and having an outlet opening (11) and an outlet valve (6,7), which closes the outlet opening (11) in cycles and consists of a valve spring (10) and a stop plate (6a,7a) for delimiting an opening movement of the valve spring (10).

In order to achieve a cost-efficient production and installation of the cylinder head cover (8) while assuring a secure support of the stop plate (6a,7a), it is provided according to the invention that the cylinder head cover (8) comprises at least two contact surfaces (12,13) for supporting stop plates (6a,7a) of different outlet valves (6,7) in order to adjust different opening positions of the valve springs (10) of the different outlet valves (6,7).

A manually operated pump exhibiting numerous improvement over existing such pumps is described. The pump can include a cylinder that is removeably mounted to a molded valve box of unitary construction. The valve box can feature a valve plate covering a valve chamber and housing an inlet valve and an outlet valve. In some instances, the pump includes a molded piston of unitary construction to which a pair of opposing piston cups is mounted. In some cases, the pump includes a filler cap forming an inlet adapted to deliver a priming fluid into the cylinder. In some cases, the pump includes a stopper cap adapted to prevent a pump shaft from being fully pulled out of the cylinder.

A compressor includes a motor, a compression mechanism including a compression chamber, and an injection mechanism including an introduction port and a check valve mechanism. The check valve mechanism includes a leaf spring, valve having a frame portion fitting an inner peripheral wall of the introduction port, a valve end portion located inside the frame portion, and a neck portion connecting the valve end portion and the frame portion together. The leaf spring valve opens the introduction port by being elastically deformed. A valve retainer is disposed between a leaf spring valve and an outflow opening surface of the introduction port. The valve end portion of the leaf spring valve in an open state contacts the valve retainer. The valve retainer is shaped to expose part of the valve end portion in the open state to the outflow opening surface of the introduction port.

A pump system for pumping liquid from a well into a pipe is disclosed. The pump system comprises: a suction cavity in fluid communication with the well via an inlet port controlled by an inlet port valve, a plunger, reciprocally movable within the suction cavity, and a delivery conduit. The delivery conduit is in fluid communication with the pipe via an outlet port, and with the suction cavity via a connection port controlled by a connection port valve. The pump system also comprises a tubular encapsulation, encapsulating the suction cavity, the plunger, the delivery conduit and the valves.

A piston-type fuel pump for an internal combustion engine includes a pump housing, a piston, an annular counterplate, and a non-return outlet valve. The pump housing includes a stepped opening and a piston opening. The piston is guided in the piston opening. The counterplate is pressed into the stepped opening and includes a valve seat. The non-return valve includes a valve element and a guide element. The guide element guides the valve element, is arranged radially outside the valve element and in the stepped opening, and includes a guide section, a retention section, and a support section. The guide section guides the valve element, the retention section is connected to the guide section via a radially extending connecting section, and the support section supports a valve spring. The sections are arranged axially at different points such that the guide section is between the counterplate and the support section.

A pump includes a vibrating plate, a flow path forming member, a pump chamber, and a film valve. The vibrating plate is provided with a piezoelectric element, vibrates due to distortion of the piezoelectric element, and has a gap on an outer periphery. The flow path forming member is disposed so as to face the vibrating plate, and has a hole in a portion facing the vibrating plate. The pump chamber is surrounded by the vibrating plate and the flow path forming member, and has a central space communicating with the hole and an outer edge space communicating with the gap. The film valve is disposed in the pump chamber. The film valve is in contact with the vibrating plate and the flow path forming member when a pressure in the central space is lower than a pressure in the outer edge space.

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.

Embodiments of the disclosure provide a micro-fluid pump having a pump cover with a distribution wall, a one-way valve having a spark surface, and a micro-fluid pump including such a one-way valve as well as a micro fluid pump including a diaphragm deformation control structure. The pump having the pump cover with the distribution wall includes a pump body. The pump cover overlies the pump body to form at least a portion of the inlet passage and at least a portion of the discharge passage, and includes an inlet cavity for containing fluid entering the micro-fluid pump from the outside and a discharge cavity for containing fluid to be discharged from the micro-fluid pump, which cavities are separated by an isolation portion. The pump cover has on its bottom surface a distribution wall which is disposed in the inlet cavity and extends at least partially toward the partition portion.