What is Bellows Gate Valve ?
The bellows gate valve is based on the ordinary gate valve to add a metal bellows seal. It adopts the bellows and packing double seal in the valve stem part. It is easy to leak for the packing part, the stem and packing seal is isolated from the medium, in order to prevent the valve stem dynamic seal in the use of leakage. Metal bellows are the key sealing components of bellows valves, and their structural design directly affects the quality of the whole valve.
Advantages of bellows gate valve
- 01The bellows made of metal materials are highly resistant to pressure and corrosion.
- 02The double sealing design (bellows + packing) will prevent leakage if the bellows fails, which meets international sealing standards.
- 03No fluid loss, reduced energy loss, and improved factory equipment safety.
- 04Reduce valve replacement and maintenance rates, and the service life of bellows valves can be two to three times higher than that of ordinary valves
- 05The sealing performance reaches zero leakage.
- 06The bellows gate valve has strong durability and supports long-term production of enterprises.
Design Standard
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| The characteristics of bellows gate valve |
The gate is the key component of the bellows gate valve. It is connected to the bellows through a telescopic mechanism and plays the role of opening and closing the pipeline. The gate has a rigid gate and an elastic gate. According to the difference in the gate, the gate valve is divided into a rigid gate valve and an elastic gate valve. The metal bellows contains the unique mechanical properties of metal, has good sealing, is pressure-resistant, corrosion-resistant, high and low temperature-resistant, has good elasticity, and can withstand a certain torque. The metal bellows can produce corresponding displacements under the action of pressure, lateral force or bending moment, which can improve the sealing performance of the valve stem and protect the valve stem from corrosion by the medium. The sealing structure of the bellows gate valve includes the seal between the gate and the valve body and the seal between the bellows and the pipeline. Among them, the gate seal usually adopts soft seal or metal seal, and the bellows seal adopts rubber or polytetrafluoroethylene and other materials. |
| Technical Parameters | |
| Size | DN15-DN1500, 1/2''-60'' |
| Pressure | PN10-PN420, Class150-Class2500 |
| 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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