What is Bonnet Welded Globe Valve ?
The valve body and the upper valve cover are connected by welding. The function of the bonnet welded globe valve in the pipeline is to cut off, adjust or throttle. The opening and closing part of the globe valve, also called the valve disc, moves along the center line of the valve seat, and the change of the valve seat opening is directly proportional to the valve disc stroke.
Advantages of bonnet welded globe valve
- 01The bonnet welded has small fluid resistance, its resistance coefficient is equal to that of the pipe section of the same length.
- 02It has simple structure, small size and light weight.
- 03It is tight and reliable, the sealing surface material of the gate valve is widely made of plastic, with good sealing performance, and has been widely used in vacuum systems.
- 04It is easy to be operated, quick opened and closed, only need to rotate 90° from full open to full closed, which is convenient for long-distance control.
- 05It has easy maintenance, the sealing ring is generally movable, and it is convenient to disassemble and replace.
- 06When fully opened or fully closed, the sealing surface of the globe and the valve seat is isolated from the medium, and when the medium passes, it will not cause erosion of the valve sealing surface.
Design Standard
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| The characteristics of bonnet welded globe valve |
When the valve is closed, the packing material will not be affected by the medium pressure and temperature for a long time, which can extend the service life and reduce the probability of leakage. The low to high design makes the flow resistance small, and saves effort when opening the valve. At the same time, when the valve is closed, the packing material between the valve shell and the valve cover and the packing around the valve stem are not stressed, and the medium pressure and temperature will not be affected for a long time, which can extend the service life and reduce the probability of leakage. In addition, this can also be replaced or added in the valve closed state, easy maintenance. The flow channel in the bonnet welded globe valve is designed to have a smooth arc inner wall without sharp corners and sharp edges, which can provide a smooth process without abnormal turbulence and noise. The stuffing box seals the valve core stem. The stuffing box includes a series of packing rings, glands or guide covers. The packing spacer and anti-extrusion ring are used to prevent a small amount of process medium from leaking to the atmosphere. |
| 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 | AAPI 598, ISO 5208, BS EN 12266, ASME B16.104, GOST 9544-2015, JIS B2003, DIN 3230, etc |
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