Cryogenic shut-off valve

Specification

Valve size: NPS1/2 ~ NPS8 DN15 ~ DN200

Pressure rating: 150LB ~ 300LB, PN16 ~ PN40

Material: LCB, LC1, LC2, LC3, LC9, CA6NM, CF8, CF8M

Design and manufacturing standards: GBT 24925, ASME B16.34, GB/T 12235

Face to face standards: ASME B 16.10, GB/T12221

End standard: Any standard can be set as required, and the connection method can be flange, butt welding, socket welding, thread, etc.

Stress test standards: GB/T 13927, API 598, BS EN 12266 -1

Quality / Product Certification: ISO 9001, API 6D, PED 2014/68/EU, EAC, ATEX and OSHAS 18001

Safety and reliability: in line with SIL3

Optional valve actuators: polished rods, gears, handwheels, electric actuators, etc.

Sealing grade: API 598 (zero leak), grade six (FCI 70-2), ISO 5208 grade A

Characteristics

Globe valves are available in a variety of connections and material combinations.

Valves can be equipped with additional features such as bellows seal or check for increased tightness requirements.

For all valve parts with a temperature less than -100 °C, cryogenic treatment according to relevant regulations to prevent low-temperature brittleness of materials and volume change caused by material phase transformation at low temperatures.

The long neck structure is adopted to make the working temperature of the packing above 0 °C, which effectively prevents the sealing property from being lowered due to the working temperature being too low, and even the sealing failure, and at the same time, it is convenient to wrap the insulating material with the valve to prevent the loss of cold energy. When the temperature is lower than -100 °C, the stem material is chrome-plated or nitrided to improve the surface hardness of the stem and improve the reliability of the filler.

The gasket has reliable sealing and recovery at normal temperature, low temperature and temperature change.

Double-layer stem packing and pressure butterfly type shrapnel device are adopted.