What is Rising Stem Knife Gate Valve ?
The rising stem knife gate valve means that the valve stem is a lifting type, and the valve stem and the gate rise and fall together to complete the opening and closing process of the gate valve. The opening and closing parts of knife gate valves are gates, and the movement direction of the gate is perpendicular to the direction of the fluid. The gate has two sealing surfaces. The two sealing surfaces of the most commonly used mode gate valve form a wedge shape. The gate of the wedge-type knife-type gate valve can be made into a whole (rigid gate), or a gate that can produce a slight deformation (elastic gate) to improve its processability and compensate for the deviation of the sealing surface angle during the processing. There is actually no chamber in the valve body. The gate rises and falls in the side guide groove and is pressed against the valve seat by the lug at the bottom. If a higher medium sealing performance is required, an O-ring sealing valve seat can be selected to achieve bidirectional sealing.
Advantages of rising stem knife gate valve
- 01It has ultra-short structural length that saves materials, can greatly reduce the overall weight of the pipeline system.
- 02It occupies a small effective space, can effectively support the strength of the pipeline, and can reduce the possibility of pipeline vibration.
- 03The gate is made of austenitic stainless steel, which greatly improves the corrosion resistance and can effectively prevent the seal leakage caused by gate corrosion.
- 04The upper sealing packing adopts flexible PTFE, which has reliable sealing and light and flexible operation.
- 05The gate has the function of a gate knife, which can effectively cut off all kinds of debris in the medium.
- 06If hard sealing stainless steel material is used and the valve disc is spray-welded, the valve requirements for temperature and pressure can be well expanded.
Design Standard
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| The characteristics of rising stem knife gate valve |
The sealing surface of the blade gate valve and the base of the knife gate valve are made of hard materials, which enables it to adapt to high-speed flow, high viscosity and particulate media and extend the service life of the valve. The knife plate of the knife gate valve is blade-shaped. When the valve is closed, the knife plate can be completely embedded in the valve seat, thereby achieving complete cutting off of the medium and having good sealing performance. The stainless steel valve body is durable, the valve body reinforcement rib design improves the valve body strength, and the double-headed screw is used for faster opening and closing. In order to ensure the sealing performance of the knife gate valve, a sealing device is used to seal between the gate plate and the valve seat. Common sealing devices include packing seals and metal seals. The packing seal uses flexible packing to fill between the gate and the valve seat. The metal seal uses metal materials to directly contact to form a seal. |
| 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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