Pneumatic Actuated Gate Valve Manufacturer in India

Pneumatic actuated gate valves use compressed air to automate gate movement for pipeline isolation. Speciality Valve manufactures pneumatic actuated gate valve assemblies for applications requiring remote shut-off, reliable isolation and controlled operation. Valve and actuator selection should consider valve size, pressure class, differential pressure, stem design, seating load, required actuator thrust, available air-supply pressure, materials and service conditions.

Gate Valve Construction:

Gate valve construction is selected according to pressure, temperature and the required isolation duty.

• Wedge Gate: Commonly used for isolation duties with seating performance determined by the selected valve and seat design.

• Parallel Gate: Uses parallel gate/disc and seat surfaces in suitable Gate Valve designs for isolation service.

• Rising Stem: Provides visible indication of stem movement and valve position.

• Non-Rising Stem: The stem does not rise externally during operation, reducing vertical space requirements where this design is suitable.

• Bolted Bonnet: Common construction for a wide range of industrial services.

• Pressure Seal Bonnet: Used in applicable Gate Valve designs according to the required pressure-temperature duty.

Materials and Grades:

Material selection depends on the process medium, operating temperature, pressure and corrosion conditions.

Gate, stem, seating surfaces and other wetted components should be selected as a compatible material system according to the process medium, temperature, pressure, corrosion and wear conditions.

Applicable cast or forged grades depend on the selected Gate Valve construction and governing material specification.

Pressure Classes and Size:

Pneumatic Actuator Arrangement:

Pneumatic actuation is configured according to required stem thrust, operating cycle, air supply and fail position.

• Single Acting Pneumatic Actuator – Uses compressed air in one direction with spring return for a specified fail position.

• Double Acting Pneumatic Actuator – Uses compressed air for both opening and closing.

• Air Supply: Commonly 4–8 bar according to actuator design and available plant-air conditions.

• Fail Position: Fail-open, fail-close or specified position according to the actuator and pneumatic control arrangement.

• Accessories: Solenoid valve, limit switch, position indicator and manual override.

• Actuator Ambient Temperature: According to actuator model, seals, accessories and installation environment.

Gate and Seating Options:

The closure and seating arrangement influence shut-off performance and service suitability.

• Wedge Seating: Suitable for general isolation applications.

• Parallel Seating: Used for selected pressure and temperature conditions.

• Metal Seat: Selected where process temperature, media, wear or service conditions require metallic seating surfaces.

• Resilient Seat: Used for compatible media and operating conditions.

Stem and trim materials can be selected to provide suitable resistance to corrosion, wear and process conditions.

Technical Details:

Pneumatic actuated gate valve assemblies are generally specified by the valve's pressure class, stem arrangement and actuator thrust. The actuator must provide sufficient thrust to overcome differential-pressure forces, seating/unseating load, packing friction and operating resistance throughout the valve stroke.

Key sizing parameters include:

• Required stem thrust

• Differential pressure

• Valve travel/stroke

• Seating/unseating load

• Packing friction

• Operating time/cycle frequency

Valve Standards and Testing:

Depending on valve design and service, applicable standards may include:

• API 600 – Applicable steel Gate Valve designs.

• API 602 – Applicable compact forged steel Gate Valve designs.

• API 6D – Applicable pipeline Gate Valve designs only.

• ASME B16.34 – Where applicable.

• ASME B16.10 – Face-to-face dimensions where applicable.

• API 598 / ISO 5208 – Applicable pressure and leakage testing.

Testing may include:

• Shell pressure testing

• Seat leakage testing

• Valve cycling

• Pneumatic actuator functional testing

• Thrust verification

• Material verification

• Dimensional inspection

• Full open/close stroke verification

• Open and closed limit-position check

• Air-supply/function check

• Actuator thrust/setting verification

• Fail-position test

• Solenoid and limit-switch function check where provided

• Manual override check where provided

Pneumatic Actuated Gate Valve Applications:

• Pipeline Isolation – Remote shut-off on oil, gas and process pipelines.

• Tank Farm Lines – Isolation of storage and transfer piping.

• Steam Systems – Automated isolation on suitable high-temperature utility lines.

• Pump Systems – Automated isolation on suitable suction or discharge piping.

• Process Plant Piping – Remote shut-off where manual valve operation is difficult.

Share the valve size, pressure class, differential pressure, process temperature, stem design, required operating time, available air-supply pressure and fail-position requirement with Speciality Valve for Pneumatic Actuated Gate Valve and actuator selection.