Product
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Low temperature gate valve
Low temperature gate valve refers to a valve whose opening and closing components (gate) move vertically along the direction of medium flow (channel axis) to achieve opening and closing. The connection method for wedge gate valves is flange, which is the most common. Wedge gate valves are stable and reliable when used in pipelines, so wedge gate valves are usually used in high-pressure pipelines. The packing part of the low-temperature gate valve is raised, that is, the valve stem is lengthened, which can be reliably and stably applied in working conditions below -40 ℃.
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Structural features:
1. The gate has two sealing surfaces, and the most commonly used one is that the two sealing surfaces of the gate form a wedge shape. The wedge angle varies with the valve parameters, usually 5 °.
2. The sealing principle of wedge gate valve is achieved by the tight combination of the two sealing surfaces on the wedge gate and the two sealing surfaces on the valve body when wedged in.
3. Wedge gate valves can be divided into rising stem gate valves (lift stem gate valves) and hidden stem gate valves (rotary stem gate valves) based on the different ways in which the valve stem drives the gate to open and close.
4. Wedge gate valves can be divided into elastic gate valves and rigid gate valves according to the different forms of gate structures.
5. The valve body is cast, and the valve body and valve cover are connected by bolts. The middle flange is sealed with a wrapped gasket. If the customer has special requirements, a metal ring connection can also be used.
6. Smooth channel with low flow coefficient. The sealing surface is less susceptible to erosion and erosion by the medium.
7. The sealing surface is made of alloy steel or hard alloy, which has good wear resistance and abrasion resistance.
8. Using flexible graphite packing, the seal is reliable and the operation is easy and flexible.
9. Simple form, short structural length, good manufacturing processability, and wide applicability.
Design specifications:
Design standards: API 600, ASME B16.34, GB/T 12234, MESC SPE 77/200
Structural length: ASME B16.10, GB/T 12221
Connection standards: ASME B16.5, ASME B16.47, GB/T 9124, JB/T 79, HG/T 20592
Pressure test: API 598, GB/T 13927, GB/T 26480, JB/T 9092
Pressure and temperature rating: ASME B16.34, GB/T 12224
Performance parameters:
Main material: carbon steel, stainless steel
Nominal diameter: NPS 2 "~NPS 64" DN50~DN1600
Pressure range: CL150~CL2500 PN10~PN420
Working temperature: -196 ℃~+200 ℃
Application scope: It can be applied to flammable, explosive, and highly permeable substances, such as liquid nitrogen and LNG.
