A pressure relief valve is provided that includes a valve housing, a poppet valve and a damper. The valve housing includes a valve seat and a bore. The poppet valve includes a head and a stem. The head is configured to engage the valve seat when the poppet valve is in a closed position. The head is configured to disengage the valve seat when the poppet valve is in an open position. The stem projects axially out from the head and through the bore. The damper includes a damper chamber axially between the valve housing and the head.

A valve member includes a specific range in which an overlap area that is an area in which a hole opening and a slide outer wall are overlapped with each other becomes gradually smaller and a minimum passage area that is a passage area between an intermediate chamber and a first hole being minimum becomes gradually larger as the valve member is moved in a direction away from a valve seat portion in a movable range in the axial direction.

A valve member includes a specific range in which an overlap area that is an area in which a hole opening and a slide outer wall are overlapped with each other becomes gradually smaller and a minimum passage area that is a passage area between an intermediate chamber and a first hole being minimum becomes gradually larger as the valve member is moved in a direction away from a valve seat portion in a movable range in the axial direction.

An object of the invention is to provide a method of controlling a gate valve that operates the gate valve in a short time while suppressing vibration of the valve body. A method of controlling a gate valve provided on an opening of a chamber, wherein the gate valve includes a valve body that opens and closes so as to close the opening of a chamber, a valve seat provided on the edge of the opening to which the valve body is pressed, and a sealing material for sealing between the valve body and the valve seat. The invented method is characterized in that, in moving the valve body to the open position from the closed position where the valve body is pressed against the valve seat with the sealing material compressed, the valve body is made to stop temporarily for a predetermined time at the position immediately before the compressed sealing material is pulled apart or immediately after pulled apart in the opening movement of the valve body.

A mass flow controller includes an inlet, a flow path in which fluid passes, a mass flow sensor configured to provide a signal corresponding to mass flow of the fluid through the flow path; a control valve configured to regulate a flow of the fluid out of an outlet of the mass flow controller; and a passive damping system coupled to the control valve and configured to dissipate fluid flow induced vibrations introduced by the control valve assembly. The passive damping system includes a damping pad between a receiver section of a valve base and a diaphragm backer. The passive damping system can also include a damping washer. The passive damping system can include one or more plunger balls between the damping pad and the valve base or one or more wave springs.

A mass flow controller includes an inlet, a flow path in which fluid passes, a mass flow sensor configured to provide a signal corresponding to mass flow of the fluid through the flow path; a control valve configured to regulate a flow of the fluid out of an outlet of the mass flow controller; and a passive damping system coupled to the control valve and configured to dissipate fluid flow induced vibrations introduced by the control valve assembly. The passive damping system includes a damping pad between a receiver section of a valve base and a diaphragm backer. The passive damping system can also include a damping washer. The passive damping system can include one or more plunger balls between the damping pad and the valve base or one or more wave springs.

A reciprocating body (2) has valve element (6) including deflecting surface (10a), valve shaft (7) guided by guide cylinder (4), and packing (8) having an annular shape circularly brought into close contact with valve seat (12a) in a state where the reciprocating body (2) is in a closed position. The valve element (6) includes large diameter portion (9a), and small diameter portion (9b) and deflecting portion (10). The large diameter portion (9a) has flange surface (9d) supporting the packing (8) in a state where the packing (8) is exposed to the primary flow passage side. The flange surface (9d) is formed such that the flange surface (9d) is allowed to come into contact with the valve seat (12a) via the packing (8). Recess (9c) is formed on the outer periphery of the small diameter portion (9b), and a portion of the packing (8) is fitted in the recess (9c).

A reciprocating body (2) has valve element (6) including deflecting surface (10a), valve shaft (7) guided by guide cylinder (4), and packing (8) having an annular shape circularly brought into close contact with valve seat (12a) in a state where the reciprocating body (2) is in a closed position. The valve element (6) includes large diameter portion (9a), and small diameter portion (9b) and deflecting portion (10). The large diameter portion (9a) has flange surface (9d) supporting the packing (8) in a state where the packing (8) is exposed to the primary flow passage side. The flange surface (9d) is formed such that the flange surface (9d) is allowed to come into contact with the valve seat (12a) via the packing (8). Recess (9c) is formed on the outer periphery of the small diameter portion (9b), and a portion of the packing (8) is fitted in the recess (9c).

A switching valve for an air spring arrangement of a motor vehicle, which switching valve has a valve housing arrangement which, in the installed state, is arranged between a first air volume and a second air volume. A valve closing member arrangement is actuatable by an actuator is provided such that the valve closing member arrangement, in a first position, fluidically connects the first air volume to the second air volume and, in a second position, fluidically separates the first air volume from the second air volume. The valve closing member arrangement is designed as a rotary slide arrangement. A rotary slide member with first openings is provided between two valve closing bodies, wherein, in the first position, the first openings correspond with second openings of the valve closing body such that a fluidic connection can be produced between the first and the second air volume.

There is a valve assembly including a flow control valve and a flow centralizer. The flow centralizer has a flowthrough bore. The flow centralizer is downstream of the flow control valve and the flowthrough bore narrows in a direction downstream of the flow control valve. The flow centralizer may have a three-piece design including an insert defining the flowthrough bore and an orifice body and a flange ring which hold the insert in place within the orifice body.