A downhole valve includes a housing, and a sleeve positioned within the housing. The sleeve has a first axial end, a second axial end, and a seat positioned between the first and second ends. The sleeve defines an opening facing in a radial direction. The sleeve prevents fluid flow in an opposite radial direction, away from the opening. The valve also includes a retaining element coupled to or integral with the sleeve, and a first obstructing member positioned in the sleeve and movable between the seat and the retaining element. In a first position, the first obstructing member engages the seat and prevents fluid flow through the housing. In a second position, the first obstructing member is separated apart from the seat such that at least a portion of the opening is axially between the first obstructing member and the first obstructing member.

A valve system, for use with a cylinder having an extensible rod, includes a first valve assembly having a first inlet/outlet port, a check valve biased toward a closed state, the check valve having a check valve body at least partially receivable within a first port of the cylinder, a flow control valve positioned in series between the first inlet/outlet port and the check valve, and a first pilot port selectively communicable with a source of pressurized gas for opening the check valve. The valve system further includes a second valve assembly having a second inlet/outlet port, a second pilot port through which the pressurized gas must flow before being introduced to the first pilot port, and a valve body at least partially receivable within a second port of the cylinder.

A relief valve 1 includes: a housing 6 connected to a supply-side connection pipe 4a and a discharge-side connection pipe 5a and has an inflow port 61c and an outflow port 62c; a valve seat (an opening rim 61a) provided in the housing 6; a main valve body 7 which is placed in the housing 6, and capable of cutting off communication between the inflow port 61c and the outflow port 62c in the housing 6 by being seated on the valve seat (the opening rim 61a); and a biasing member 8 that biases the main valve body 7 toward the valve seat (the opening rim 61a), wherein the inflow port 61c is provided in the housing 6 such that the inflow port 61c is decentered with respect to a central axis line of the main valve body 7 in a direction in which a supply pipe 4 extends.

A check valve comprises a valve housing defining a pair of valve openings, a pair of mounting posts arranged on opposed sides of the valve housing, a hinge pin mounted between said mounting posts, a pair of flapper elements pivotably mounted to the one or more hinge pins for rotation relative to the housing between an open position in which they permit fluid flow through the respective valve openings and a closed position in which they prevent fluid flow through the valve openings. A pair of elastically deformable leaf spring stop elements, each of which comprise respective end portions that are mounted to, and extend upwardly from, said mounting posts and a stop portion arching upwardly from, and extending between said end portions, such that each flapper element will engage a respective surface of said stop portion when in the open position.

A valve housing for a check valve comprises a housing body for mounting a pair of flapper elements and a pair of valve openings extending through said valve body. The valve openings are separated by a web which extends from one side of the valve body to an opposed side of the valve body. The valve body and web define sealing surfaces around the valve openings on one face of the valve housing. The web comprises a slot extending into the web from a face thereof on said one face of said valve housing and extending along a length of the web.

Certain exemplary embodiments can provide a system, machine, device, and/or manufacture that is configured for operably releasing condensate received from a condensate-producing unit toward a drain without allowing a substantial quantity of gas to flow through the system, machine, device, and/or manufacture, those embodiments including a valve, a spring, and/or a housing.

A breaker valve assembly for a nuclear reactor containment includes a valve body, a valve body insert, and a lid. The valve body includes a first side wall defining a chamber, a first opening in a top portion of the first side wall, and a second opening in a bottom portion of the first side wall. The second opening communicates with the first opening of the valve body. The valve insert body includes a second side wall defining a second chamber, and a third opening in a bottom portion of the second side wall. The valve insert body is nested in the valve body. The lid is arranged on an upper edge of the side wall of the valve insert body. The valve insert body is configured to move substantially vertically with respect to the valve body.

One-way valve devices can be used within fluid systems. For example, this document provides one-way valves that can be installed within a lumen of a tube, a fitting, and other types of tubular members. In some embodiments, the one-way valve includes a unitary frame and a ball member that is loosely constrained within the confines of the frame.

A valve comprises a first housing including a first lumen extending therethrough and defining a first disk-facing surface and a second housing including a second lumen extending therethrough and defining a second disk-facing surface, the second housing being mated to the first housing so that the second disk-facing surface faces the first disk-facing surface in combination with a flexible disk gripped between gripping portions of the first and second disk-facing surfaces, the disk including a slit extending therethrough which, when acted upon by a fluid pressure of at least a predetermined threshold level opens to permit fluid flow between the first and second lumens and which, when acted upon by a fluid pressure less than the threshold level remains sealed preventing fluid flow between the first and second lumens and a relief well between opposing portions of the first and second housings radially outside the gripping portions, a width of the relief well exceeding a width of a radially outer portion of the flexible disk so that the radially outer portion of the disk is free to move therewithin.