A vent for selectively sealing an opening of an enclosed chamber includes a body, a first poppet, a second poppet, and a face seal. The body is configured to be coupled to the enclosed chamber. The first poppet is disposed within the body and is biased by a first biasing member. The first poppet includes a first surface. The second poppet is disposed within the body and includes a second surface. The second poppet is biased toward the first poppet such that the second surface is biased toward engaging the first surface. The face seal is positioned between the first surface and the second surface.

A P/V valve that can be positioned at a working height above grade (i.e., a height reachable by a service technician positioned at grade) while still providing appropriate resistance to fire and explosion by venting to atmosphere at an appropriate height above grade (e.g., 12 feet) is disclosed. In certain exemplifications of the present disclosure, the P/V valve features a diaphragm actuated two-way poppet valve actuatable by a valve piston. In alternative exemplifications of the present disclosure, the P/V valve is positioned intermediate grade and the distal end of a P/V valve riser pipe and is contained in a vault fluidly connected to the P/V valve riser pipe, the P/V valve locally venting in the vault, which is hermetically sealed to the P/V valve riser pipe.

A pressure cap for a cooling system of a vehicle may include a reservoir fill port which is mounted at an upper portion of a reservoir in which cooling water is stored in a cooling system of the vehicle; an external cap for closing an upper end portion of the reservoir fill port; a pressure valve disposed in the reservoir fill port to allow the inside and the outside of the reservoir fill portion to fluidically-communicate with each other; a valve seal provided to allow the air to flow from the outside into the internal to the cooling system by being deformed when pressure in the internal to the cooling system is lower than a predetermined pressure; and a positive pressure spring elastically supporting the pressure valve such that the pressure valve closes the internal to the reservoir fill port.

A pressure cap for a cooling system of a vehicle may include a reservoir fill port which is mounted at an upper portion of a reservoir in which cooling water is stored in a cooling system of the vehicle; an external cap for closing an upper end portion of the reservoir fill port; a pressure valve disposed in the reservoir fill port to allow the inside and the outside of the reservoir fill portion to fluidically-communicate with each other; a valve seal provided to allow the air to flow from the outside into the internal to the cooling system by being deformed when pressure in the internal to the cooling system is lower than a predetermined pressure; and a positive pressure spring elastically supporting the pressure valve such that the pressure valve closes the internal to the reservoir fill port.

A control line stabilizer includes a body defining an inlet chamber, an outlet chamber, a passageway connecting the inlet chamber and the outlet chamber, a first seat, and a second seat. A disc is disposed in the passageway and is movable between a first closed position, in which the disc engages the first seat, an open position, in which the disc is spaced away from the first seat and the second seat, and a second closed position in which the disc engages the second seat. A first spring is disposed in the outlet chamber and is operatively coupled to the disc. A second spring is disposed in the inlet chamber and is operatively coupled to the disc. The disc restricts fluid flow through the passageway by moving to the first closed position and by moving to the second closed position.

An oilfield production string portion including a valve with a valve housing, a multiseal shuttle including a piston and a lid, the piston having a through hole and movable in the housing for enabling linear flow through the valve or for enabling non-linear flow through the valve.

An oilfield production string portion including a valve with a valve housing, a multiseal shuttle including a piston and a lid, the piston having a through hole and movable in the housing for enabling linear flow through the valve or for enabling non-linear flow through the valve.

A vent control valve includes: a first case shaped in a tube that forms a passage for ventilation; a movable valve object arranged in the first case to open and close the passage; an inner case arranged in the first case to support the movable valve object; a second case disposed at a lower end of the first case; a first connection mechanism defined between the first case and the inner case, the first connection mechanism connecting the first case and the inner case with each other; and a second connection mechanism defined between the first case and the second case, the second connection mechanism connecting the first case and the second case with each other.

A hydraulic fluid expansion tank is located inside a housing of a drive device and includes an upper check valve and a lower check valve in communication with a sump located within the drive device and an internal volume of the expansion tank. The tank may also include a vent opening in communication with a vent of the drive device that is in communication with atmospheric pressure.

Valve disc assemblies for fluid valves having soft seats are disclosed herein. An example valve disc assembly for a fluid valve comprises a first portion to slidably engage a wall of the fluid valve to guide movement of the valve disc assembly and a second portion to receive a valve stem to control a position of the valve disc assembly, the second portion including an angled surface to retain a seal between the first and second portions.