PNEUMATIC KNIFE GATE VALVE
OVERVIEW
The pneumatic knife gate valve is a valve that combines a pneumatic actuator and a knife-type gate structure. It is mainly used to quickly cut off or regulate media with high viscosity, particles or fibers.
FEATURES
Efficient cutting ability
The knife gate can cut fibers and particles, and is suitable for high-viscosity media (such as sewage, sludge, and slurry).
Low flow resistance design
The full-diameter structure has almost no pressure loss when the medium passes through, which is suitable for slurry conveying pipelines.
Wear and corrosion resistance
The gate and valve body lining can be made of stainless steel, ceramic or special coating to extend the service life.
Fast response
The pneumatic drive switches quickly (usually completed within a few seconds), which is suitable for frequent operations or emergency cutting scenarios.
Easy maintenance
The modular design allows the gate to be replaced online to reduce downtime.
WORKING PRINCIPLE
Opening process: Compressed air enters the pneumatic actuator cylinder, pushing the piston to move, driving the valve stem and gate to rise, and the valve opens.
Closing process: The pneumatic actuator vents in the reverse direction (or spring resets), and the gate moves down to cut off the medium. The blade design can scrape off the valve seat residue to keep the sealing surface clean.
Adjustment function: By controlling the air source pressure through the positioner, the gate opening can be adjusted and the flow rate can be accurately controlled (valve support is required).
BASIC COMPOSITION
Valve body
Usually adopt casting or welding structure, the material can be cast iron, carbon steel, stainless steel, etc., to meet the needs of different media. The flow channel is designed as straight-through type to reduce the flow resistance of the medium and avoid blockage.
Gate
Blade-like design with sharp edges to cut through viscous media (such as mud, pulp) or solid particles to prevent jamming. The material is wear-resistant and the surface may be hardened (such as surfacing with hard alloy)
Sealed structure
Seat seal: Use elastic sealing ring (such as rubber, polytetrafluoroethylene) or metal seal to ensure tightness when closed. Bidirectional seal: Some designs support the medium to flow in any direction and can be sealed.
Pneumatic actuators
Single-acting (spring reset): open/closed when ventilated, spring reset when air is cut off, suitable for fail-safe position requirements. Double-acting: two-way control of ventilation, air source is required to drive the switch, no automatic reset function.
Valve stem
The valve stem is designed to be lifting, connected to the gate, and driven by a pneumatic actuator to make linear motion. A packing seal (such as graphite packing) is used to prevent the medium from leaking.
TECHNICAL PARAMETERS
Working pressure is usually 0.6MPa~2.5MPa
Applicable temperature Normal working conditions: -29C ~ +180C
Media type Applicable to slurries containing suspended particles and fibers
Sealing performance Leakage level meets industry standards
Connection form Wafer type, flange connection
ADVANTAGES
The advantages of pneumatic flange discharge valves mainly include high reliability, good adjustability, compact and light structure, fast response and low energy consumption.
High reliability: Pneumatic flange discharge valves use pneumatic actuators to operate the valves. Compared with traditional manual operation methods, they have higher reliability and stability and can operate stably under various harsh working conditions.
Good adjustability: Pneumatic actuators can quickly respond to signals and adjust the opening and closing speed of the valves, thereby achieving precise control of the fluid medium to meet different process requirements.
Compact and light structure: Pneumatic flange discharge valves, such as pneumatic flange butterfly valves, are made of lightweight materials, with compact structure and small size, which is easy to install and maintain, and reduces the load of the system.
Fast response: Pneumatic flange discharge valves have the characteristics of fast response, which can quickly realize the opening or closing state of the valve, which is very beneficial for application scenarios that require high-frequency operation and improves the efficiency and response speed of the system.
Low energy consumption: Compared with electric or hydraulic valves, pneumatic flange double material valves have lower energy consumption and are more energy-saving and environmentally friendly.
In addition, the pneumatic flange discharge valve also has good sealing performance, which can effectively prevent medium leakage and ensure the safe operation of the system. At the same time, its materials and manufacturing standards also meet relevant domestic and foreign requirements, and the overall quality.
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