What is Bonnet Bolted Gate Valve ?
The gate valve is a valve with an opening and gate driven by a valve stem and a linear lifting and lowering motion along the seat (sealing surface). Generally, gate valves cannot be used to regulate flow, but can only be used as a cut-off device, either fully open or fully closed. Bolted bonnet is the most commonly used connection structure, and most industrial gate valves today use this structure. Unlike threaded and union-type connection structures, the connection between the valve body and the bonnet in the bolted bonnet structure requires a gasket seal.
Advantages of bonnet bolted gate valve
- 01It is more labor-saving when opening and closing. Whether it is open or closed, the movement direction of the gate is perpendicular to the flow direction of the medium.
- 02The height is large and the opening and closing time is long. The opening and closing stroke of the gate is large, and the lifting is carried out by the screw.
- 03Water hammer phenomenon is not easy to occur. The reason is the long closing time.
- 04The medium can flow in any direction on both sides, which is easy to install. The two sides of the gate valve channel are symmetrical
- 05The structural length (the distance between the two connecting end faces of the shell) is small.
- 06The shape is simple, the structural length is short, the manufacturing process is good, and the application range is wide.
Design Standard
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| The characteristics of bonnet bolted gate valve |
The structure of bonnet bolted gate valve is compact, the valve has good rigidity, the passage is smooth, the flow resistance is small, the sealing surface is made of stainless steel and hard alloy, the service life is long, the PTFE packing is used, the sealing is reliable, and the operation is light and flexible. The valve has small fluid resistance. Since the gate valve body is a straight-through type, the medium flow does not change direction, so the flow resistance is smaller than other valves. The seat seal ring can be directly welded on the valve body to form a sealing surface according to customer requirements. For cast iron, stainless steel, and copper alloy valves, the sealing surface can also be directly processed on the valve body. Electric, pneumatic power and manpower can be directly transmitted to the valve stem or valve stem nut. Handwheel, bonnet, transmission mechanism, connecting shaft and universal coupling are often used for long-distance driving. |
| 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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