What is Bellows Globe Valve ?
The working principle of the bellows globe valve is to replace the original valve stem sealing packing with a metal bellows welded on the valve stem and sealed between the valve cover and the valve body. The opening and closing and adjustment of the stop valve will compress and stretch the metal bellows, thus completely eliminating the possibility of steam leakage from the valve stem. In the transportation, distribution and use of steam, the appropriate choice is the bellows globe valve.
Advantages of bellows globe valve
- 01Double sealing design (bellows + packing). If the bellows fails, the valve stem packing will also avoid leakage.
- 02It has no fluid loss, reduces energy loss, and improves factory equipment safety.
- 03The bellows globe valve has a long service life, reduces the number of maintenance times, and reduces operating costs.
- 04The sturdy and durable bellows seal design ensures zero leakage of the valve stem and provides maintenance-free conditions.
- 05The valve stem of the bellows globe valve is tempered and nitrided on the surface, which has good corrosion resistance and anti-friction performance.
- 06The high temperature resistant seat uses a conical hard seal, and achieve airtight performance and zero leakage.
Design Standard
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| The characteristics of bellows globe valve |
The bellows globe valve adopts a bellows structure inside. The lower end of the stainless steel bellows is welded to the valve stem to prevent the process fluid from corroding the valve stem. The other end is placed between the valve body and the valve cover to form a static seal. The double sealing design will prevent the valve stem packing from leaking if the bellows fails. The bellows are welded to the valve stem to maintain stable operating performance and avoid valve stem vibration caused by valve plug vibration. The valve stem has a relatively short opening or closing stroke and has a very reliable cutting function. Since the change of the valve seat opening is proportional to the stroke of the valve disc, it is very suitable for regulating the flow rate. The valve seat and valve disc sealing surface adopt the form of conical sealing, which has a large wedge tightening force and a good sealing effect. The sealing surface is welded with cobalt-based cemented carbide, which has high hardness, corrosion resistance, wear resistance, and scratch resistance, and prolongs the service life. |
| 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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