A check valve (300) that opens and closes by causing a valve element (130) to come into contact with and separate from a valve seat (104) and thereby controls a flow of fluid that flows in through an inlet (101) and flows out through an outlet (102), having a guide portion (135) that has a fluid guide surface provided at a downside thereof, wherein the valve seat (104) has a first valve seat and a second valve seat, and the valve element (130) has a first valve portion (131) that is to be seated on the first valve seat, a second valve portion (132) that is to be seated on the second valve seat, and a pressure receiving surface (134) that extends between the first valve portion (131) and the second valve portion (132) in such a manner that a distance between the pressure receiving surface (134) and the first valve seat gradually reduces.

A check valve (300) that opens and closes by causing a valve element (130) to come into contact with and separate from a valve seat (104) and thereby controls a flow of fluid that flows in through an inlet (101) and flows out through an outlet (102), having a guide portion (135) that has a fluid guide surface provided at a downside thereof, wherein the valve seat (104) has a first valve seat and a second valve seat, and the valve element (130) has a first valve portion (131) that is to be seated on the first valve seat, a second valve portion (132) that is to be seated on the second valve seat, and a pressure receiving surface (134) that extends between the first valve portion (131) and the second valve portion (132) in such a manner that a distance between the pressure receiving surface (134) and the first valve seat gradually reduces.

A check valve (300) that opens and closes by causing a valve element (130) to come into contact with and separate from a valve seat (104) and thereby controls a flow of fluid that flows in through an inlet (101) and flows out through an outlet (102), having a guide portion (135) that has a fluid guide surface provided at a downside thereof, wherein the valve seat (104) has a first valve seat and a second valve seat, and the valve element (130) has a first valve portion (131) that is to be seated on the first valve seat, a second valve portion (132) that is to be seated on the second valve seat, and a pressure receiving surface (134) that extends between the first valve portion (131) and the second valve portion (132) in such a manner that a distance between the pressure receiving surface (134) and the first valve seat gradually reduces.

A check valve (100) that opens and closes by causing a valve element (112) to come into contact with and separate from a valve seat (104) and thereby controls a flow of fluid that flows in through an inlet (101) and flows out through an outlet (102). The check valve (100) has: the inlet (101) provided at a downside thereof; the outlet (102) provided at an upside thereof; the valve seat (104) formed to surround the inlet (101); the valve element (112) configured to be able to come into contact with and separate from the valve seat (104) vertically; and a guide portion (105) that has a fluid guide surface (118) horizontally guiding a fluid flowing in through the inlet (101), and a valve element guide surface (111) provided on a side surface thereof, the valve element guide surface (111) vertically guiding the valve element.

A check valve (100) that opens and closes by causing a valve element (112) to come into contact with and separate from a valve seat (104) and thereby controls a flow of fluid that flows in through an inlet (101) and flows out through an outlet (102). The check valve (100) has: the inlet (101) provided at a downside thereof; the outlet (102) provided at an upside thereof; the valve seat (104) formed to surround the inlet (101); the valve element (112) configured to be able to come into contact with and separate from the valve seat (104) vertically; and a guide portion (105) that has a fluid guide surface (118) horizontally guiding a fluid flowing in through the inlet (101), and a valve element guide surface (111) provided on a side surface thereof, the valve element guide surface (111) vertically guiding the valve element.

Embodiments of the invention provide a control valve including a control valve body having an inlet passage, an outlet passage, a workport, and a chamber arranged in a fluid path between the workport and the outlet passage. The control valve further includes an annular poppet slidably received within the chamber and to selectively engage a poppet seat to inhibit fluid flow through the fluid path when a pressure in the fluid path is less than a predefined pressure level, and a valve element slidably received within the control valve body to selectively provide fluid communication between the inlet passage and the workport and selectively provide fluid communication between the workport and the outlet passage along the fluid path. The poppet is biased towards the poppet seat by an elastic element.

Embodiments of the invention provide a control valve including a control valve body having an inlet passage, an outlet passage, a workport, and a chamber arranged in a fluid path between the workport and the outlet passage. The control valve further includes an annular poppet slidably received within the chamber and to selectively engage a poppet seat to inhibit fluid flow through the fluid path when a pressure in the fluid path is less than a predefined pressure level, and a valve element slidably received within the control valve body to selectively provide fluid communication between the inlet passage and the workport and selectively provide fluid communication between the workport and the outlet passage along the fluid path. The poppet is biased towards the poppet seat by an elastic element.

An apparatus for allowing the repetitive oscillation of pressure in a container or vessel having a finite volume. The apparatus comprises a valve having first opening, a valve enclosure having a second opening, and a first tension device. In some embodiments the apparatus can have a chamber capable of oscillating in volume. The oscillation of the chamber volume causes a decrease in the pressure of the container. As the pressure of the space or container decreases, two openings of the apparatus become more proximate. Eventually the openings partially overlap, allowing a gas, or fluid, to enter the container, increasing pressure of the space or container. As a result of the pressure increase, the first opening and second opening become less proximate by a force of the first tension device. The apparatus can allow the container to approach substantially perfect vacuum and rise toward atmospheric pressure.

An apparatus for allowing the repetitive oscillation of pressure in a container or vessel having a finite volume. The apparatus comprises a valve having first opening, a valve enclosure having a second opening, and a first tension device. In some embodiments the apparatus can have a chamber capable of oscillating in volume. The oscillation of the chamber volume causes a decrease in the pressure of the container. As the pressure of the space or container decreases, two openings of the apparatus become more proximate. Eventually the openings partially overlap, allowing a gas, or fluid, to enter the container, increasing pressure of the space or container. As a result of the pressure increase, the first opening and second opening become less proximate by a force of the first tension device. The apparatus can allow the container to approach substantially perfect vacuum and rise toward atmospheric pressure.

Check valves are disclosed that have a housing defining an internal cavity having a first port and a second port both in fluid communication therewith, and having a first seat defined by a first elastomeric V-ring seal and a second seat. and a check valve plate within the internal cavity that is translatable, in response to pressure differentials, between a closed position against the first seat and an open position against the second seat within the internal cavity of the housing. The first elastomeric V-ring seal includes a body having an interference fit to an annular channel defined by the housing and a lip extending from the body in a direction that defines a generally V-shaped void, viewed in cross-section, opening in a direction away from and generally perpendicular to the flow through the elastomeric V-ring seal into the internal cavity.