What is Bonnet Welded Gate Valve ?
Gate valves usually consist of a valve body and a bonnet, which form the pressure-bearing housing of the gate valve. Welded bonnet is a very popular valve body bonnet joint. It is the most commonly used structure for compact steel valves with specifications of 1/2~2in, pound classes between Class 800~2500, and no need to disassemble. Similar to the pressure-sealed bonnet, the welded bonnet gate valve is lighter than the bolted bonnet gate valve.
Advantages of bonnet welded gate valve
- 01It has small fluid resistance.
- 02Small torque required for opening and closing.
- 03It can be used on ring network pipelines where the medium flows in two directions, that is, the flow direction of the medium is not restricted.
- 04When fully open, the sealing surface is less eroded by the working medium than the globe valve
- 05The shape and structure are relatively simple, and the manufacturing process is good.
- 06The structure length is relatively short.
Design Standard
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| The characteristics of bonnet welded gate valve |
The gate moves linearly with the valve stem. Usually, there is a trapezoidal thread on the lifting rod. Through the nut at the top of the valve and the guide groove on the valve body, the rotary motion is converted into linear motion, that is, the operating torque is converted into operating thrust. The body is directly connected to the pipeline and constitutes a pressure-bearing component for the flow channel of the medium. It is an important part for installing the valve cover, placing the valve seat, and connecting the pipeline. The valve body must accommodate a vertical disc-shaped station that moves up and down, so the height of the inner cavity of the valve body is relatively large. The bonnet is the main pressure-bearing component connected to the valve body and forming a pressure chamber with the valve body, and there is a stuffing box on it. For medium and small-caliber valves, the valve cover is provided with a mechanism to support parts such as the valve stem nut or transmission device. Directly connected to the valve stem nut or transmission device, the light rod part forms a sealing pair with the packing, which can transmit torque and play the role of opening and closing the gate. According to the thread position on the valve stem, it is divided into a clear stem gate valve and a dark stem gate valve. |
| 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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