A hydraulic machine includes a first member (1) having a first structure (2) for a hydraulic medium opening in a first interface surface (3) and a second member having a second structure for the hydraulic medium opening in a second interface surface is described, the first interface surface (3) being in contact with the second interface surface, wherein at least one of the members (1) is provided with a support element (6) surrounding the member (1). Such a machine should have a good efficiency. To this end the support element (6) has a strength varying in circumferential direction around the member (1) and/or in thickness direction in a middle region of the member (1).

The present invention refers to a device for the discharge of a pressurised liquid comprising: a liquid intake section (2400), a liquid discharge lance (2300), a pump (2200), which can be connected to a motor (2100), the pump having an inlet connected to the intake section and an outlet connected to the discharge lance, where the discharge lance and the pump are connected by a connection (2800, 2801, 2802, 2803, 2804), with at most three rotational degrees of freedom and/or one translational degree of freedom.

A shaft-distributed double-acting roller piston pump includes a front end cover, a pump casing, a rear end cover and a pump core assembly. The pump core assembly includes a guide rail assembly including left and right guide rails arranged back to back. The side surfaces of the left and right guide rails away from each other are space cam curved surfaces. A flow distribution shaft is installed in the center of the guide rail assembly. A cylinder assembly is installed on both sides of the guide rail assembly including left and right cylinders, between which a piston assembly is arranged. The piston assembly forms left and right closed cavities with the left and right cylinders respectively. The piston assembly performs axial reciprocating linear motion under the constraint of the cylinder assembly and the guide rail assembly, and the volumes of the left and right closed cavities change continuously.

A shaft-distributed double-acting roller piston pump includes a front end cover, a pump casing, a rear end cover and a pump core assembly. The pump core assembly includes a guide rail assembly including left and right guide rails arranged back to back. The side surfaces of the left and right guide rails away from each other are space cam curved surfaces. A flow distribution shaft is installed in the center of the guide rail assembly. A cylinder assembly is installed on both sides of the guide rail assembly including left and right cylinders, between which a piston assembly is arranged. The piston assembly forms left and right closed cavities with the left and right cylinders respectively. The piston assembly performs axial reciprocating linear motion under the constraint of the cylinder assembly and the guide rail assembly, and the volumes of the left and right closed cavities change continuously.

An automatic depressurizing pump includes an air-generating unit and an airflow control unit. The air-generating unit has a first air intake hole. An air generated by the air-generating unit drives the air control unit so as to inhale or exhale airflows through the first air intake hole. The airflow control unit includes a valve base, a first valve, a second valve, a top cover, and a resilient member. The valve base includes an air output chamber and a pressure chamber. The resilient member includes a second air output hole and a depressurization valve. The second air output hole is communicated with the top of the air output chamber, and the depressurization valve hermetically covers on and fixes to the top of the pressure chamber.

A sliding member including, a support layer and a sliding layer provided on a side of one end surface of the support layer configured to slide on a mating member, the sliding layer having a hardness set higher toward an outer side than at a center in an axial direction.

A linear compressor includes a shell, a motor in the shell, a mover coupled to the motor and configured to perform a reciprocating motion in an axial direction, a cylinder disposed in the shell, a piston coupled to the mover and configured to reciprocate in the cylinder, a spring that supports the piston in the axial direction, and a spring cap inserted into an end portion of the spring. The spring cap defines a space portion that is defined inside the spring cap and has a volume separate from the inner space of the shell, and a passage portion that extends through an axial side surface of the spring cap and is configured to provide communication between the space portion and the inner space of the shell.

A sliding member including, a support layer and a sliding layer provided on a side of one end surface of the support layer configured to slide on a mating member, the sliding layer having a hardness set higher toward an outer side than at a center in an axial direction.

Provided is a reciprocating pump including: pump sections that are disposed in parallel with each other, each of the pump sections including a suction part for inflow of fluid, and a discharge part for outflow of fluid; a suction-side fluid passage for connection between the suction parts of the pump sections; and a discharge-side fluid passage for connection between the discharge parts of the pump sections; each of the pump sections includes a suction valve that allows and blocks circulation of fluid to be sucked, and a discharge valve that allows and blocks circulation of fluid to be discharged; a suction-valve operation member that opens the suction valve from outside; and a discharge-valve operation member that opens the discharge valve from outside. The suction-side fluid passage and the discharge-side fluid passage are expandable and contractible in a pipe axial direction.

Provided is a reciprocating pump including: pump sections that are disposed in parallel with each other, each of the pump sections including a suction part for inflow of fluid, and a discharge part for outflow of fluid; a suction-side fluid passage for connection between the suction parts of the pump sections; and a discharge-side fluid passage for connection between the discharge parts of the pump sections; each of the pump sections includes a suction valve that allows and blocks circulation of fluid to be sucked, and a discharge valve that allows and blocks circulation of fluid to be discharged; a suction-valve operation member that opens the suction valve from outside; and a discharge-valve operation member that opens the discharge valve from outside. The suction-side fluid passage and the discharge-side fluid passage are expandable and contractible in a pipe axial direction.