Pneumatic knife gate valves are specialized valves equipped with pneumatic actuators (powered by compressed air). They achieve media interception by vertically raising and lowering a knife gate plate through air pressure. Designed specifically for scenarios requiring rapid automated control when conveying media containing particles (≤10mm), fibers, or high viscosity (such as sewage, slurry, and pulp), these valves solve the problems of laborious operation and slow response of manual knife gate valves.
They combine the advantages of rapid pneumatic opening and closing (response time ≤10 seconds), compact structure, and unobstructed flow path to prevent blockage. Compliant with GB/T 13927 and API 609 standards, they are widely used in automated media conveying systems in municipal wastewater treatment, mining, chemical, and papermaking industries.
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Pneumatic knife gate valves Technical Parameters
Nominal Diameter: DN50~1200mm
Nominal Pressure: PN0.6~1.6MPa
Operating Temperature: -20~80℃
Valve Body Material: Carbon Steel (C), Stainless Steel (P4, P6)
Design Standards: API 600, API6D, ASME B16.34, GB/T 12234
Structural Length: ASME B16.10, API6D, GB/T 12221
Connection Standards: ASME B16.5, ASME B16.47, GB/T 9113, JB/T 79, HG/T 20592
Pressure Testing: API 598, GB/T 13927, JB/T 9092
Pressure-Temperature Rating: ASME B16.34, GB/T 12224
Mexican customer's custom pneumatic knife gate valve drawings
| Size | A | B | C | D | E | F | G | H | Weight |
|---|---|---|---|---|---|---|---|---|---|
| 2 | 2 | 1 7/8 | 3 | 16 1/4 | 4 1/2 | 4 | 5/8 UNC | 4 3/4 | 23 LBS |
| 4 | 4 | 2 | 4 3/8 | 22 | 4 1/2 | 8 | 5/8 UNC | 7 1/2 | 33 LBS |
| 6 | 6 | 2 1/4 | 5 3/8 | 27 1/2 | 5 1/2 | 8 | 3/4 UNC | 9 1/2 | 60 LBS |
| 8 | 8 | 2 3/4 | 6 5/8 | 34 1/4 | 6 7/8 | 8 | 3/4 UNC | 11 3/4 | 105 LBS |
| 10 | 10 | 2 3/4 | 8 | 39 5/8 | 8 5/8 | 12 | 7/8 UNC | 14 1/4 | 155 LBS |
| 12 | 12 | 3 | 9 3/8 | 45 | 8 5/8 | 12 | 7/8 UNC | 17 | 200 LBS |
| 14 | 14 | 3 | 10 1/4 | 51 | 10 7/8 | 12 | 1 UNC | 18 3/4 | 300 LBS |
| 16 | 16 | 3 1/2 | 11 1/2 | 56 | 10 7/8 | 16 | 1 UNC | 21 1/4 | 360 LBS |
| 18 | 18 | 3 1/2 | 12 3/8 | 65 | 15 | 16 | 1 1/8 UNC | 22 3/4 | 470 LBS |
| 20 | 20 | 4 1/2 | 13 1/2 | 70 | 15 | 20 | 1 1/8 UNC | 25 | 645 LBS |
| 24 | 24 | 4 1/2 | 15 3/4 | 79 1/2 | 15 | 20 | 1 1/4 UNC | 29 1/2 | 830 LBS |
Pneumatic knife gate valves Working Principle
Pneumatic knife gate valves utilize compressed air to drive a piston in a pneumatic actuator, which in turn rotates or lifts a torsion shaft to actuate the valve stem. Pneumatic valves are classified into three types: single-acting, double-acting, and intelligent regulating.
Single-acting pneumatic actuators use a spring-driven piston structure with two operating principles: open and normally closed (air-to-open or air-to-close). When no gas enters, the spring pushes the piston to close the valve (normally closed). When gas enters the cylinder, the valve closes; when gas supply is cut off, the spring drives the piston to open the valve (open). When purchasing, care should be taken to avoid valves where the spring has been compressed for an extended period and lost its function.
Double-acting valves operate on an air-to-open/air-to-close principle. Double-acting pneumatic valves require a 2-position 5-way solenoid valve. When gas enters through port A, it drives the piston to rotate and close the valve. Gas to open the valve enters through port B, simultaneously disconnecting port A, causing the piston to rotate and open the valve.
Pneumatic knife gate valves Performance Advantages
- Highly efficient operation: The actuation method of pneumatic knife gate valves provides rapid response and precise control. The immediacy of compressed air allows valves to open or close rapidly, improving production efficiency.
- Safe and Reliable: Pneumatic knife gate valves are typically designed and manufactured to be very robust, enabling stable operation in various harsh environments. Their excellent sealing performance effectively prevents media leakage, ensuring operational safety. Furthermore, their compact structure and strong overall integrity further enhance their safety.
- Easy to Maintain: Pneumatic knife gate valves feature a simple design and are relatively easy to maintain. Due to their low coefficient of friction and wear resistance, the valves have a relatively long service life. Simultaneously, their sealing materials can be selected according to different media, reducing the risk of damage due to media corrosion.
- High Adaptability: Pneumatic knife gate valves can adapt to various fluid media, including gases, liquids, and slurries. The selectability of their sealing materials further enhances their ability to adapt to different operating conditions.
- Remote Controllable: Pneumatic knife gate valves can be remotely controlled through a control system, which is crucial for automated production lines. Through preset programs or manual operation, the valves can be easily opened and closed, improving the automation level of the production line.
- Energy-saving and environmentally friendly: Compared with traditional hydraulic or electric valves, pneumatic knife gate valves consume less energy. Furthermore, due to their excellent sealing performance, they effectively reduce media waste, aligning with modern industrial energy-saving and environmental protection principles.
- Multiple control methods: Modern pneumatic knife gate valves not only support traditional mechanical control methods but also support control via PLC, DCS, and other control systems, further improving their automation level and ease of operation.
- Small size and light weight: Pneumatic knife gate valves feature a compact structural design, resulting in relatively small size and weight, facilitating installation and transportation.
Pneumatic knife gate valves factory
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