A gas booster for increasing a pressure of a gas includes a gas cylinder and a drive. The gas cylinder defines a chamber having an inlet and an outlet. A piston is actuatable within the gas cylinder to draw gas into the chamber through the inlet at a first pressure and to push the gas out of the chamber through the outlet at a second pressure that is higher than the first pressure. The drive includes an electric motor coupled to the piston of the gas cylinder by a mechanical connection to actuate the piston.

A hermetic compressor equipped with a valve assembly may include a valve plate having one suction port and a plurality of discharge ports; a suction valve provided at a first surface of the valve plate; a discharge valve provided at a second surface of the valve plate and having one fixing portion and a plurality of opening and closing portions that extends from the one fixing portion to respectively open and close the plurality of discharge ports; and a valve stopper that is fixed to the valve plate and limits a degree of opening of the opening and closing portions of the discharge valve. Accordingly, the opening and closing portions of the discharge valve may be reduced in size to thereby reduce inertia of the discharge valve. Thus, response of the discharge valve may be increased while simplifying a structure and assembly of the discharge valve.

A valve unit for a piston compressor includes a housing, in which at least one inlet valve and at least one outlet valve are arranged. The housing includes a first cylinder-head-side surface and a second, cylinder-side surface which is away from the first cylinder-head-side surface. The surfaces extending transversely to a longitudinal axis of the valve unit. A peripheral wall of the housing of the valve unit, and which surrounds the longitudinal axis of the valve unit, includes at least one contact section. The at least one contact section is provided for contact on a contact surface on the cylinder or on the cylinder head and extends obliquely to the longitudinal axis.

A vehicle-mounted electric oil-free air compressor, including a motor, a box body, a piston, and a flywheel shaft. The motor is fixed on the box body, a cylinder cover is at the top of the box body, a main shaft of the motor includes a coupling driving end, the flywheel shaft is driven by an elastic body to rotate. The piston includes a primary intake valve piece and a primary exhaust valve piece, the box body is provided with a secondary cavity, a secondary exhaust valve piece is provided at a vent hole on one side of the cavity, and the primary exhaust valve piece is also a secondary intake valve piece of the compressor, increasing the exhaust pressure. When the piston reciprocates, the stress is balanced and the vibration is small, and with the assistance of a high-efficiency flywheel, the operation of the air compressor is stable.

A housing upper part for a labyrinth piston compressor having a cylinder barrel running in the direction of a longitudinal axis, with a cylinder interior and a cylinder barrel exterior. The cylinder barrel has at least one-cylinder inlet opening or cylinder outlet opening which open into the cylinder interior. Wherein a gas distribution housing at least partially encloses the cylinder barrel in the circumferential direction about the longitudinal axis (L) forming between the gas distribution housing and at least one-part section of the cylinder barrel exterior, a gas distribution interior. Wherein the part section is axisymmetric about the longitudinal axis, the gas distribution interior is fluidically connected to the cylinder interior either via the cylinder inlet opening or the cylinder outlet opening, and the gas distribution housing has either a gas inlet or a gas outlet which is fluidically connected to the gas distribution interior.

A hand grip mechanism includes a first member, a second member connected to the first member in a vertically moveable manner, a spring providing a biasing force to lower the second member with respect to the first member, and a hand grip configured by two grip links, each including a grip rotatably connected to the first member, a link rotatably connected to the second member below a connecting portion between the first member and the grip, and first and second connecting shafts each connecting the grip and the link below a connecting portion between the second member and the link. By a pressing operation to squeeze the hand grip against the biasing force of the spring, the grip and link in each grip link rotate relative to each other about the first connecting shaft during initial movement and about the second connecting shaft during final movement.

A fuel pump, is disclosed, including a power group having a housing, a coil, a pole piece and a movable armature; a valve group including a valve body, a plunger connected to the armature, a bushing in which the plunger is disposed, an inlet chamber, an outlet chamber, a pump chamber, an inlet valve disposed between the inlet chamber and the pump chamber and an outlet valve disposed between the pump chamber and the outlet valve; and an inlet filter coupled to a fluid inlet of the valve group. The inlet filter is disposed relative to the coil such that when the fuel pump is disposed within a fuel tank, a bottom of the inlet filter as oriented in the fuel tank is disposed above a fuel level in the fuel tank and the coil is at least partly submerged in the fuel.

A hand grip mechanism includes a first member, a second member connected to the first member in a vertically moveable manner, a spring providing a biasing force to lower the second member with respect to the first member, and a hand grip configured by two grip links, each including a grip rotatably connected to the first member, a link rotatably connected to the second member below a connecting portion between the first member and the grip, and first and second connecting shafts each connecting the grip and the link below a connecting portion between the second member and the link. By a pressing operation to squeeze the hand grip against the biasing force of the spring, the grip and link in each grip link rotate relative to each other about the first connecting shaft during initial movement and about the second connecting shaft during final movement.

A hermetic compressor equipped with a valve assembly may include a valve plate having one suction port and a plurality of discharge ports; a suction valve provided at a first surface of the valve plate; a discharge valve provided at a second surface of the valve plate and having one fixing portion and a plurality of opening and closing portions that extends from the one fixing portion to respectively open and close the plurality of discharge ports; and a valve stopper that is fixed to the valve plate and limits a degree of opening of the opening and closing portions of the discharge valve. Accordingly, the opening and closing portions of the discharge valve may be reduced in size to thereby reduce inertia of the discharge valve. Thus, response of the discharge valve may be increased while simplifying a structure and assembly of the discharge valve.

A valve assembly for a fluid pump includes a valve body; an inlet disk movably disposed in the valve body; an outlet disk movably disposed in the valve body; and a valve seat fixed within the valve body. The valve seat includes a first aperture defined axially through the valve seat in a radial central portion thereof, and one or more second apertures disposed at least partly around the first aperture. The inlet disk is biased in a closed position against the valve seat along a first surface thereof, the closed position of the inlet disk covering the one or more second apertures of the valve seat. The outlet disk is biased in a closed position against the valve seat along a second surface thereof.