What is Power Station Gate Valve ?
Power station gate valve is mainly used in the pipeline of various systems of thermal power station to cut off or connect non-corrosive media such as water and steam in the pipeline. Power station valve is characterized by high temperature and high pressure, unique self-sealing design, the higher the pressure, the more reliable the seal. And the power station gate valve from the pressure is lower than the general valve, from the temperature is also lower than the general valve.
Advantages of power station gate valve
- 01Pressure self-tightening seal is adopted, and both ends of the valve body branch pipe are welded.
- 02The sealing surface of the seat and valve flap is made of cobalt-based cemented carbide plasma spray welding, which has good wear resistance and abrasion resistance.
- 03The valve stem is treated with anti-corrosive nitriding and has good corrosion resistance and abrasion resistance.
- 04The valve nut is equipped with thrust bearing to reduce the valve switching torque, and the opening and closing are flexible and light.
- 05When the medium pressure is low, it is sealed by the bolt pre-tightening force; As the medium pressure increases, the valve cap gradually moves upward, forcing the seal washer to tighten, thereby enhancing the sealing performance.
- 06The sealing surface of the gate and the seat is surfacing with cobalt-based cemented carbide, which is wear-resistant, high-temperature resistant, corrosion-resistant, and abrasion resistant.
Design Standard
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| The characteristics of power station gate valve |
The valve body can be forged or cast according to the working conditions and customer requirements, and choose different grades of alloy steel according to the working conditions and requirements to meet high temperature and high pressure or other special requirements. The sealing surface between the seat and the gate is surfacing welded Stairi carbide, which is highly hardened and finely ground to ensure high hardness and poor hardness of the sealing surface and effectively extend the service life; The valve seat leakage rate reaches zero leakage standard. Valve stem surface by precision grinding and nitriding treatment, small friction with the packing, abrasion resistance and corrosion resistance, effectively reduce the opening and closing torque, coupled with the valve stem copper nut supported by needle roller bearings, easier operation. The valve cavity adopts pressure self-tightening seal. Under the action of medium pressure, the valve cover moves upward to form a seal at the conical sealing ring. The greater the medium pressure, the greater the sealing force and the reliable sealing. |
| Technical Parameters | |
| Size | DN15-DN1500, 1/2''-60'' |
| Pressure | PN6-PN760, Class150-Class4500 |
| Temperature | -200°C to 650°C |
| Connection Type | Flange, Thread, Wafer, Welded |
| Operation Mode | Manual, Pneumatic, Electric, Hydraulic, Gear operation |
| Materials | ||
| Valve Body | Forged | A105, LF2, F5, F9, F11, F22, F304, F316, F347, F904, F51, F53, F310, N08020, Inconel625, etc |
| Cast | WCB, LCB, C5, C12, WC6, WC9, CF8, CF8M, CF8C, 4A, 5A, CN7M, C95800, CW6MC, etc | |
| Valve Stem | F6a, 17-4PH, XM-19, F304, F316, F347, F904, F51, F53, F310, Monel400, Monel500, N08020, Inconel625, Incoloy825, etc. | |
| Valve Disc | A105, LF2, F5, F9, F11, F22, F304, F316, F347, F904, F51, F53, F310, N08020, Inconel625, F6a, 17-4PH, XM-19, F304, F316, F347, F904, F51, F53, F310, Monel400, Monel500，Incoloy825，WCB, LCB, C5, C12, WC6, WC9, CF8, CF8M, CF8C, 4A, 5A, CN7M, C95800, CW6MC, etc. | |
| Seat Sealing | SS, BR, CU, AS, CS, AL, PTFE, NBR, FKM, AI203, etc. | |
| Design Standards | |
| Valve Body | API 6D, API 608, ASME B16.34, DIN 3357, BS 5351, GOST 9833, JIS B2071, GB/T 12237, etc. |
| Flange | ANSI B16.5, EN 1092-1, JIS B2220, GB/T 9113, ASME B16.47, GOST 12821, DIN 2543-2545, etc. |
| Connection | ANSI B16.10, ASME B16.25, JIS B2212, GOST 33259, DIN 3202, etc. |
| Test Standards | API 598, ISO 5208, BS EN 12266, ASME B16.104, GOST 9544-2015, JIS B2003, DIN 3230, etc. |
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