The pneumatic piston knife gate valve is a specialized type of valve designed to cut off dense or viscous fluids. In this valve, the flow-sealing component has a sharp knife-like shape. The knife is moved up and down with the help of a piston to control the flow. Piston movement is actuated by pneumatic pressure and integrated into the control system. These valves are generally designed to operate in fully open or fully closed positions.

In industrial systems, it is preferred for muddy, fibrous, or high-viscosity fluids. Its operating principle offers a minimal risk of clogging. Additionally, the valve body is made from durable materials such as stainless steel or cast iron, ensuring high performance even in harsh environments.

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Where Are Piston Knife Gate Valves Used?

Pneumatic piston knife gate valves are primarily used in systems that handle liquids containing solid materials. They provide an effective solution for directing fibrous liquids in pulp and paper plants. They are widely used in wastewater treatment facilities to control sludge flow. Additionally, they are preferred in the mining industry for cutting dense, particle-laden fluids. In the chemical and food industries, they stand out for their resistance to fibrous or sticky substances.

They can be easily integrated into process control systems. Automatic opening and closing save time and labor. At the same time, system safety is enhanced, and operator errors are reduced.

Technical Specifications

Body Material: Stainless steel or ductile cast iron
Sealing: PTFE, EPDM, NBR, or metal gasket
Operating Pressure: Up to 10 bar
Temperature Range: -10°C to +180°C
Connection Type: Flanged, wafer, or lug-type connection
Piston Type: Single-acting or double-acting pneumatic piston

Why Are Piston Knife Gate Valves Preferred?

They are preferred because they provide uninterrupted control of fluids with high solid content. Minimal pressure loss increases energy efficiency. Integration with automation systems improves process safety. Additionally, their long-lasting performance under harsh conditions reduces maintenance costs. Thanks to their compact design, they can be easily installed in confined spaces.

You can visit our Unox Valve Category page to explore all types of gate valves. For technical support or a product quote, you can contact us directly.