高压阀门是指：介质的温度、压力和阀门材料组合，导致选用的压力等级大于等于CLASS900或PN100的阀门。

High pressure valves refer to valves with a selected pressure rating greater than or equal to CLASS900 or PN100 due to the combination of temperature, pressure, and valve material of the medium.

高压，尤其是高压气体介质，意味着输送设备包括阀门储能高，一旦发生设备失效，产生的危害较大；

High pressure, especially high-pressure gas media, means that the conveying equipment, including valves, has high energy storage. Once equipment failure occurs, the harm caused is significant;

高压对阀门的密封包括自身的密封及与管道设备连接处的密封带来困难；

The sealing of valves under high pressure, including their own sealing and sealing at the connection with pipeline equipment, poses difficulties;

高压使得阀门承压部件对材料的缺陷变得更敏感；

High pressure makes valve pressure bearing components more sensitive to material defects;

如果高压与一些危险介质共存会大大增加阀门可靠性的要求；

If high pressure coexists with some hazardous media, it will greatly increase the requirement for valve reliability;

高压往往伴随着较高的流速，流体通过阀门的阻力降也会增大等。

High pressure is often accompanied by higher flow velocity, and the resistance drop of fluid passing through valves will also increase.

因此，高压下应用的阀门，下列的选用原则应予考虑。

Therefore, the following selection principles should be considered for valves used under high pressure.

1.阀门类型

1. Valve type

（1）应选用密封可靠性较高的阀门。如切断阀，可选用闸阀、截止阀、球阀等，但不宜选用蝶阀。止回阀可选用升降式和旋启式，但不宜选用对夹式。

(1) Valves with high sealing reliability should be selected. For shut-off valves, gate valves, globe valves, ball valves, etc. can be used, but butterfly valves should not be used. Check valves can be of the lift and swing types, but they should not be of the clamp type.

（2）非金属密封蝶阀包括中线型和双偏心型不宜用于CLASS600或PN64以上等级。金属密封蝶阀三偏心蝶阀不宜用于CLASS1500或PN160以上等级。具体应用范围还应该咨询阀门制造商。

(2) Non metallic sealed butterfly valves, including medium and double eccentric types, are not suitable for use in Class 600 or PN64 or higher grades. Metal sealed butterfly valves with three eccentricities should not be used for grades above CLASS1500 or PN160. The specific application scope should also be consulted with the valve manufacturer.

（3）非金属密封球阀包括顶装式、两片式和三片式不宜用于CLASS600或PN64以上压力等级。具体应用范围还应咨询阀门制造商。

(3) Non metallic sealed ball valves, including top mounted, two-piece, and three piece types, are not suitable for pressure ratings above CLASS600 or PN64. The specific application scope should also be consulted with the valve manufacturer.

（4）全衬里型阀门包括旋塞阀和隔膜阀等不宜用于CLASS600或PN64以上压力等级。具体应用范围还应咨询阀门制造商。

(4) Fully lined valves, including plug valves and diaphragm valves, are not suitable for pressure ratings above CLASS600 or PN64. The specific application scope should also be consulted with the valve manufacturer.

2.阀门结构

2. Valve structure

（1）除非工艺要求需要，如泄压要求，所有阀门均不应采用缩径阀门。

(1) Unless required by the process, such as pressure relief requirements, all valves should not use reduced diameter valves.

（2）除非有其他特殊需要如可预见需要拆卸的地方，应尽可能采用焊接连接。

(2) Unless there are other special needs such as foreseeable disassembly, welding connections should be used as much as possible.

（3）对于具有阀盖结构且DN50及以上的阀门，应尽可能采用压力密封阀盖。

(3) For valves with a valve cover structure and DN50 and above, pressure sealed valve covers should be used as much as possible.

（4）阀门内件:DN50及以上闸阀宜采用楔形弹性阀瓣;截止阀宜采用旋塞型或球形阀瓣。

(4) Valve internals: For gate valves of DN50 and above, wedge-shaped elastic valve discs should be used; Globe valves should use plug type or spherical valve discs.

3.阀门材料

3. Valve material

（1）对于承压部件，应适当提高材料的质量性能指标，包括提高表面质量、追加无损检验项目等。

(1) For pressure bearing components, the quality performance indicators of materials should be appropriately improved, including improving surface quality and adding non-destructive testing items.

（2）栓连阀盖螺栓应为高强度螺栓，垫片应为缠绕式垫或金属垫。

(2) The bolted valve cover bolts should be high-strength bolts, and the gaskets should be wrapped gaskets or metal gaskets.

（3）阀瓣和阀座密封面、上密封如果有的话密封面均应进行硬化处理，闸阀和截止阀导轨也宜进行硬化处理。

(3) The sealing surfaces of the valve disc, valve seat, and upper seal, if any, should be hardened. The guide rails of gate valves and globe valves should also be hardened.

（4）阀杆表面宜进行适当的硬化处理，以维持良好的耐磨性。

(4) The surface of the valve stem should be appropriately hardened to maintain good wear resistance.

（5）对于非金属密封阀门，应考虑非金属材料对高的密封比压的适应性。例如，PTFE材料由于冷流问题而对介质压力有上限限制。

(5) For non-metallic sealed valves, the adaptability of non-metallic materials to high sealing pressure should be considered. For example, PTFE material has an upper limit on medium pressure due to cold flow issues.

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