A method and apparatus for a manual gas valve. The manual gas valve may include at least one internal spring and a valve plug. The internal spring may be independent from an external spring and a valve stem. The internal spring may be positioned in a constant installed height. The internal spring includes a constant spring force applied to the valve plug. The one or more manual gas valves may be used in a variety of applications.

A process control valve can include a valve body having a fluid inlet, a fluid outlet and a valve seat disposed fluidically between the fluid inlet and the fluid outlet; a valve stem having a longitudinal axis, a first end and a second end longitudinally opposite the first end; and a valve member disposed within the valve body and configured to selectively sealingly engage the valve seat for controlling fluid flow through the valve. The first end of the valve stem can be disposed at least partially within the valve body and can be operably coupled to the valve member for controlling a position of the valve member relative to the valve seat. The valve member can be configured to resist blowout of the valve stem.

A stop valve adaptor to make a stop valve having a threaded stem actuatable through a stop valve box using a stop valve key. The stop valve adaptor is affixed to the threaded stop valve stem using a nut. The stop valve box is preferably made of a polymeric material and is maintained at a predetermined length by using friction due to O-rings, a glue joint, or clamping to dispose a stop valve box cover at the ground surface.

According to one embodiment a gas tap is provided that includes a manually operable shaft having a first end coupled to a regulating element and a second end configured to be coupled to a knob that can be operated by a user. The shaft includes a first locking element, and the gas tap includes a second locking element. The shaft is rotational between an initial angular position and a final angular position, and is axially movable when it is arranged in the initial angular position between a first axial position in which the first locking element and the second locking element cooperate with one another, preventing the shaft from being able to rotate, and a second axial position in which the shaft is able to rotate. The user has to pull on the shaft in order to move it from the first axial position to the second axial position.

Example aspects of a valve key, a meter valve, and a method for securing a valve key of a meter valve are disclosed. The valve key for a meter valve can comprise a key body defining an upper key body end and a lower key body end, a key head extending from the upper key body end, and a key stem extending from the lower key body end, wherein the key stem, key head, and key body define a monolithic structure, the key stem defining an extension portion and a securing portion, the securing portion defining a securing portion engagement surface.

A stopcock for a liquid channel of a medical endoscope, having a housing, a spring element and a plug rotatably mounted in the housing, wherein the plug in a working position lies with its conical surface against a seal surface of the housing and can be placed in a medium access position in which the conical and the seal surface have no contact and the housing and the plug remain connected, characterized in that the plug includes one or more transverse grooves, in the outer wall of a conical piece, running transversely to the longitudinal axis of the conical piece and having straight groove bottoms, and the spring element in the medium access position engages with one or more transverse grooves. A medical endoscope having at least one liquid channel, characterized in that it includes at least one stopcock, by which the liquid flow through the channel can be regulated.

A method and apparatus for a manual gas valve. The manual gas valve may include at least one internal spring and a valve plug. The internal spring may be independent from an external spring and a valve stem. The internal spring may be positioned in a constant installed height. The internal spring includes a constant spring force applied to the valve plug. The one or more manual gas valves may be used in a variety of applications.

A mix manifold (16) includes a plurality of valves to control the flow of material therethrough. First and second valves (36a, 36b) are linked for simultaneous actuation. The first and second valves each include valve members (56a, 56b) disposed within and rotatable relative to seal bodies (58a, 58b). The valve members seal against the seal bodies and the seal bodies seal against the manifold. A solvent valve (36c) also includes a valve member (56c) in a seal body (58c). The first and second valves are configured to open only when the solvent valve is closed. The solvent valve is configured to open only when the first and second valves are closed. The solvent valve can rotate between a plurality of positions to control the flow of solvent to flowpaths downstream of the first and second valves.

A flow regulating valve, including a valve member, a plug member, a connecting member, a fixed base, and a stepper motor. The valve member has a chamber respectively communicating with an inlet hole and an outlet hole thereof. The plug member has an axial bore and a flow regulating structure, the axial bore corresponding to the outlet hole and the flow regulating structure corresponding to the inlet hole. The connecting member is disposed at a side of the plug member and at least a part of the connecting member is exposed to the outside. The fixed base has a through hole, a wall of which is provided with a first block section and a second block section. A space is formed between the first block section and the second block section, and a block of the connection member is located in the space to limit a rotating angle of the plug member. The stepper motor has a rotating shaft connected to the connecting member and a modular flow regulating valve is formed.

The disclosed technology includes pumps, pipes, valves, seals, and systems for pumping and controlling high temperature fluids, such as liquid tin, at temperatures of between 1000-3000 C. The systems and device may be partially or entirely constructed using brittle materials, such as ceramics, that are capable of withstanding extreme heat without significantly degrading, and may be secured using components made of refractory metals, such as tungsten. The systems and devices may utilize static and dynamic seals made from brittle materials, such as graphite, to enable the high temperature operation of such pumps, pipes, valves, and systems without leakage.