Pneumatic Gate Valve

The pneumatic gate valve uses compressed air to drive the piston in the cylinder, and then drive the valve stem to realize the opening and closing of the valve.

When the compressed air enters from the upper pipeline of the cylinder, it pushes the piston to move downward, driving the valve stem to move downward, thus opening the valve.
When the compressed air enters from the lower pipeline of the cylinder, the air pushes the piston to move upward, driving the valve stem to move upward, thus closing the valve.
In case of absence of the air source, manual operation can be carried out through the screw rod and the open-close nut to open or close the valve.

When the pneumatic gate valve is closed, the sealing surface can be sealed only by the medium pressure, that is, the sealing surface of the plate is pressed against the valve seat on the other side by the medium pressure to ensure the sealing of the sealing surface. This is self-sealing. Most gate valves adopt forced sealing. That is, when the valve is closed, external force is required to press the plate against the valve seat to ensure the sealing performance.

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Features
Parameter Table
Applications

Pneumatic Wedge Gate Valves

Smooth flow path, low resistance coefficient of flow, erosion and corrosion on sealing surfaces are less likely to occur;
Unlimited flow direction, no pressure drop, simple structure, a wide range of applications;
The connections between the valve body and bonnet are available in many forms, such as bolted, threaded, and welded connections.
Self-tightening sealing structure to perfectly adapt to various working statuses;
Compact and simple structure, small space required for installation, quick opening/closing function, easy to maintain;

Pneumatic Knife Gate Valves

Heavy duty cast construction
ASA bolt hole pattern
Stainless steel construction
Thick beveled edge knife plate
Resilient rubber seats seal against pressure and vacuum
Pneumatic or manual actuation
Oversized air cylinder for pneumatic units

Technical Specifications

Pneumatic Wedge Gate Valves

Material	carbon steel, stainless steel, alloy steel, etc.
Nominal size	NPS 1/2″-NPS 48″ (DN15-DN1200)
Pressure	CL150-CL2500 (PN10-PN420)
Temperature range	-196°C to +550°C

Pneumatic Knife Gate Valve

Design Standard	MSS SP-81
F to F	As per MSS SP -81
Testing Standard	MSS SP -81
Size Range	50 mm to 600 mm
Pressure Rating	50 mm to 300 mm – 150 psi / 400 mm to 450 mm – 75 psi / 500 mm to 600 mm – 50 psi
End Style	Full Lugs, Wafer Type, Flangeless / Two Lugs, Wafer Type, Flangeless / Flange Type, Wafer
Lug Options	a. BSP Threaded hole in the chest area and lugs / b. BSP Threaded a hole in the chest area and through a hole in Lugs.
Drilling	ANSI B 16.5 Class 150, BS 10 Table ‘D’ & ‘E’, DIN, JIS, IS, etc.
Valve Operation	Cylinder, Bevel Gear, Electic Motor, Chain Wheel, Lever
Body Design	Full Round Port / “V” Notch Port / Square Port

The data is for reference only, please consult andy@vokkan.com for details.

Pneumatic gate valves are widely used in the following industries:

Petroleum and Petrochemical Industry: in places such as refineries, chemical plants, and natural gas processing plants, pneumatic gate valves are used to control, cut off, or regulate the flow of fluids, enabling the control and treatment of various media.
Power Industry: such as thermal power generation and nuclear power plants, pneumatic gate valves are used to control the flow of media such as main steam, feed water, circulating water, and cooling water, ensuring the safe and stable operation of the system.
Iron and Steel Metallurgy Industry: pneumatic gate valves are used to control high-temperature and high-pressure fluids, such as molten steel and high-temperature coal gas, and also to regulate some particulate media.
Chemical Industry: Pneumatic gate valves are used to control the flow of various chemical media in various chemical processes, such as corrosive liquids and gases. They have good corrosion resistance and sealing performance.
Pharmaceutical Industry: they are used to control the liquid and gaseous pharmaceutical raw materials and various solutions, ensuring the safety and precision of the production process.
Sewage Treatment and Environmental Protection Industry: they are used for the treatment of sewage and wastewater, as well as for controlling the discharge of various waste gases and liquids in environmental protection projects.
Food and Beverage Industry: they are used to control the flow of various foods and beverages, and are also applied in the cleaning and disinfection processes.

In general, pneumatic gate valves are widely used in various industrial fields, especially in fluid control scenarios that require precise control and rapid response.