What is Square knife Gate Valve ?
The working principle of the square gate valve is that the plate and the body are pressed together to achieve sealing through the left and right or up and down movement of the valve stem. When the plug plate is in the closed state, a completely sealed space is formed between the sealing ring and the valve body to prevent medium leakage. When the valve needs to be opened, the drive mechanism will move the plug plate to one side so that the gas can flow through the valve. The main function is to cut off the flow of the medium in the pipeline, and the knife blade of the plug valve makes its shear force greater than that of the ordinary gate valve, and the cutting effect is more excellent.
Advantages of square knife gate valve
- 01The medium through hole inside the valve body is straight, and the medium does not change its flow direction when flowing through, so the flow resistance is small.
- 02The plate is equipped with a sealing ring, which can achieve sealing with the valve body to ensure the accuracy and stability of fluid control.
- 03The pneumatic and electric square knife gate valve can fully realize automatic control, which is more convenient to operate. The manual square knife gate valve is also convenient to operate by rotating the handwheel.
- 04The material of the square knife gate valve is usually made of stainless steel with good corrosion resistance, which can be used for a long time in harsh working environments without damage.
- 05The square knife gate valve adopts a fully enclosed structure design. After the plate is opened, it is located in the closed maintenance room on the other side.
- 06The plate adopts a special leveling plate, and the sealing surface of the plate is milled and chipped, with a small sealing gap and good sealing performance.
Design Standard
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| The characteristics of square knife gate valve |
The valve stem and the valve plate are connected by threads. When the valve stem is rotated, the valve plate will rotate accordingly. When the valve plate is closed, the medium cannot pass; when the valve plate is opened, the medium can flow. The square knife gate valve usually adopts a flange connection method to connect the valve to the pipeline flange, so that the valve can withstand greater pressure and flow. The gate valve has good sealing performance and can effectively prevent medium leakage. The gate valve can prevent the reverse flow of the fluid by moving the gate to the closed position. In applications where fluid backflow needs to be prevented, the gate valve can play a good reverse blocking role. The manual square knife gate valve has the advantages of simple and compact structure, reasonable design, reliable sealing, light and flexible operation, small size, smooth channel, small resistance, easy installation, and easy disassembly. The manual spiral gate valve can be installed horizontally or vertically, and has the characteristics of anti-wear and automatic compensation functions and long life. The electric or pneumatic square knife gate valve is opened or closed by the sliding ball chain installed on the two sides of the shell, so that the gate is restricted to run in the rail guide. The optimized design scheme is adopted, the gate moves smoothly and lightly, and the driving torque is small. |
| 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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