Pneumatically Operated Gate Valve

Pneumatically operated gate valves are essential components in process control systems that demand dependable isolation and minimal pressure drop. These valves utilize compressed air to actuate a gate mechanism, moving it perpendicular to the flow path to achieve full-open or full-closed positions. The design excels in handling viscous media, slurries, and powders where other valve types may clog or wear prematurely. Our pneumatically operated gate valves are engineered with precision-machined stainless steel gates and reinforced seats, providing bubble-tight shutoff even after thousands of cycles. For applications requiring a linear sliding action with a compact footprint, the Pneumatic Sliding Gate Valve is an excellent alternative, featuring a knife-edge gate designed to cut through thick media while maintaining a lightweight body profile. Both valve types share a high-cycle pneumatic actuator platform that supports fail-safe configurations, field-adjustable travel stops, and direct mounting of solenoid pilot valves. The actuators are available in double-acting and spring-return models, with torque outputs precisely matched to the gate thrust requirements, ensuring smooth operation without over-stressing the stem seals.

The Pneumatically Operated Gate Valve is offered in a range of bore sizes, pressure classes, and end connections to suit diverse industrial installations. Each valve undergoes rigorous factory testing, including shell pressure tests at 1.5 times the rated working pressure and seat leakage tests per API 598 or FCI 70-2 standards. The actuator housing is weatherproof to IP66/IP67, with optional ATEX-certified models for hazardous area duty. A standard visual position indicator and open/close limit switches are integrated into the actuator mounting bracket, simplifying field commissioning. Additional options include high-temperature trim packages, Hastelloy internals for corrosive services, and metal-to-metal seating for abrasive solids handling.

Technical Specifications

• Nominal diameters: DN50 through DN300 (2" through 12")
• Pressure ratings: PN10, PN16, ANSI Class 150, Class 300
• Body materials: Cast iron, ductile iron, WCB carbon steel, CF8M stainless steel, duplex stainless steel
• Gate materials: 304/316 stainless steel, F51 duplex, F53 super duplex, with optional Stellite overlay
• Seat types: Resilient PTFE, reinforced EPDM, NBR, metal-to-metal
• Actuation: Rack-and-pinion pneumatic actuator, supply pressure 4–8 bar (60–120 psi)
• Operating temperature: -20°C to 200°C standard, up to 450°C with extended bonnet
• End connections: Flanged (EN 1092-1, ASME B16.5), wafer, and lugged configurations
• Accessories: 5/2- or 3/2-way solenoid valve, limit switch box, pneumatic positioner, air filter regulator

Actuator Torque and Sizing

The configuration versatility makes the Pneumatically Operated Gate Valve suitable for wastewater treatment, mining slurry transport, chemical batching, and power plant ash handling. The full-bore design eliminates flow restrictions and simplifies pigging or rodding for line cleaning. Maintenance is straightforward, with a top-entry construction that permits gate and seat replacement without removing the valve body from the pipeline. All fasteners and stem components are supplied in grade 304 stainless steel as standard, with alternative alloys available for aggressive atmospheric conditions. The pneumatic control circuit can be designed for single-acting (fail-close or fail-open) or double-acting operation, and the actuator is positionable in 90-degree increments without additional brackets, providing flexibility in confined installations.

Every Pneumatically Operated Gate Valve is delivered with a comprehensive documentation package that includes material certificates per EN 10204 3.1, functional test reports, and a detailed installation and maintenance manual. Our quality management system is certified to ISO 9001:2015, and the valves meet the essential requirements of the Pressure Equipment Directive (PED) 2014/68/EU. Standard surface preparation includes chemical passivation for stainless steel components and two-component epoxy coating for carbon steel bodies, providing excellent corrosion resistance in marine and industrial environments.