An abstract for a quench valve of a cryostat, in particular for use in a magnetic resonance imaging system, is attachable to the quench valve so as to raise the cracking pressure of the quench valve without changing the operability of the quench valve. Such an accessory device is usable to enable the cryostat, containing a cryogen, to be safely transported by air transportation.

The present disclosure provides a pilot valve and a four-way reversing valve. The pilot valve includes: a valve body, wherein the valve body is a cylinder formed by integrally stretching and having an open end and a closed end, the closed end is defined as a first end, the open end is defined as a second end, the first end of the valve body is provided with an inlet, the valve body is internally provided with a cavity, and the inlet is in communication with the cavity; an inlet pipe, connected with the first end of the valve body, wherein a pipe opening of the inlet pipe is in communication with the inlet; and a limiting structure arranged between the first end of the valve body and the inlet pipe, the limiting structure is used for limiting a relative position of the inlet pipe relative to the valve body.

The present disclosure provides a pilot valve and a four-way reversing valve. The pilot valve includes: a valve body, wherein the valve body is a cylinder formed by integrally stretching and having an open end and a closed end, the closed end is defined as a first end, the open end is defined as a second end, the first end of the valve body is provided with an inlet, the valve body is internally provided with a cavity, and the inlet is in communication with the cavity; an inlet pipe, connected with the first end of the valve body, wherein a pipe opening of the inlet pipe is in communication with the inlet; and a limiting structure arranged between the first end of the valve body and the inlet pipe, the limiting structure is used for limiting a relative position of the inlet pipe relative to the valve body.

A cylinder porous cylinder, a gas flow control valve, and a mounting method for the gas flow control valve. The porous cylinder (1) includes a plurality of pipe bundles filled inside the pipe. A single flow passage is formed in each of the pipe bundles, such that a seepage passage is formed inside the pipe. The inner diameter, length and permeability of the pipe bundle are determined in advance based on a Reynolds number smaller than 2300. The porous cylinder (1) is capable of implementing a stable gas flow in a gas injection channel. The valve body (21) of the gas flow control valve (2) is provided therein with a plurality of tubular passages arranged in sequence along the horizontal direction of the valve body. The tubular passages include a pipe flow passage (24) and a plurality of seepage passages (25). The porous cylinder (1) is mounted in each of the seepage passages (25). A plurality of connection channels (221) are provided in the valve cap. One end of each of the connection channels (221) communicates with the interior of each of the tubular passages, and the other end of each of the connection channels (221) is provided respectively with a valve stem. The opening and closing of the plurality of tubular passages are controlled by the valve stem, thus regulating the output ratio of the injected gas. In addition, a mounting method for the gas flow control valve is further provided.

A balanced valve includes a valve body, a valve stem, and first and second flow control members. The valve body forms a channel defining a fluid flow path extending from a valve inlet to a valve outlet via a valve gallery and defines an opening in fluid communication with the gallery. The valve stem has first and second portions and is at least partially disposed within the opening and the gallery. The first flow control member is coupled to the first portion of the valve stem and controls fluid flow along the fluid flow path. The second flow control member is coupled to the second portion of the valve stem and is disposed in the opening of the valve body. The second flow control member and the valve body define a cavity. An integral balancing passage is formed within the valve body and fluidly connects the cavity and the outlet.

Modular valve trim assemblies for control valves are disclosed. In some examples, a first modular valve trim apparatus includes a bonnet and a cage coupled to the bonnet. In some examples, the cage has an integral seat. In some examples, a second modular valve trim apparatus includes a single-piece bonnet including an integral cage and an integral seat. In some examples, the second modular valve trim apparatus includes a plug irremovably located within the single-piece bonnet.

A dual cartridge temperature control valve having a self-contained, top loading bonnet cartridge and a self-contained, bottom loading seat cartridge. The control valve body may include internally configured pressure channels configured to mate with the upstream and downstream pressure channels of a control valve actuator having internally integrated pressure channels.

A valve system comprising a valve body having an opening and an interior; a davit system comprising: a first pillar having an upper end and a lower end, wherein the lower end of the first pillar is attached to the valve body; a second pillar having an upper end and a lower end, wherein the lower end of the second pillar is attached to the valve body; a pivot arm having a first end and a second end, wherein the first end of the pivot arm is rotationally attached to the upper end of the first pillar, the second end of the pivot arm is removably attached to the upper end of the second pillar and the pivot arm straddles the valve body opening when the second end of the pivot arm touches the upper end of the second pillar; and a closure cap system comprising a closure cap, wherein a means for sealing the closure cap is disposed between the closure cap and the valve body; and a cap stem having an upper end and a lower end, wherein the lower end of the cap stem is attached to the closure cap and the upper end of the cap stem is disposed through a central portion of the pivot arm; and wherein a means for lifting and lowering the closure cap engages the cap stem to lift or lower the closure cap is disclosed. A method of using the valve system is also disclosed.

A valve cap (14) can be configured to have an integral sealing member (50) at least part of which is extendable into an opening(18) of a valve body (12) and seals against an inner surface of a valve body wall (16). The sealing member (50) is configured to have a void space (51) such that when fluid leaks from a valve stem disposed in the valve body (12), an internal pressure in the void space forces a surface of the sealing member (50) against the inner surface of the valve body wall (16), thereby tightening a seal between the sealing member (50) and the valve body wall (16). In such circumstances, the fluid is prevented effectively from exiting the valve cap (14).

A valve cap (14) can be configured to have an integral sealing member (50) at least part of which is extendable into an opening(18) of a valve body (12) and seals against an inner surface of a valve body wall (16). The sealing member (50) is configured to have a void space (51) such that when fluid leaks from a valve stem disposed in the valve body (12), an internal pressure in the void space forces a surface of the sealing member (50) against the inner surface of the valve body wall (16), thereby tightening a seal between the sealing member (50) and the valve body wall (16). In such circumstances, the fluid is prevented effectively from exiting the valve cap (14).