Pneumatic Actuated Knife Gate Valve Manufacturer in India

Pneumatic actuated knife gate valves combine a knife gate valve with a pneumatic actuator for automated isolation of slurry, pulp, sludge and other compatible solids-containing media. Speciality Valve manufactures pneumatic actuated knife gate valve assemblies for process lines requiring remote automated isolation of slurry, pulp, sludge and other compatible solids-containing media. Configuration depends on valve size, pressure rating, differential pressure, solids characteristics, gate material, seat arrangement, gate thrust, air supply, required fail position and service conditions.

Where Pneumatic Actuated Knife Gate Valves Are Used?

Pneumatic actuated knife gate valves are suited to process media that can be difficult to isolate with conventional valve designs.

• Slurry Transfer Lines – Used for isolation of abrasive liquid-solid mixtures.

• Pulp and Paper Lines – Applied to pulp and fibre-containing process streams.

• Mineral Processing Lines – Used on abrasive slurry and concentrate piping.

• Powder Handling Systems – Suitable for isolation of dry bulk and particulate media where the valve body, sealing and discharge arrangement permit.

• Wastewater Sludge Lines – Used for automated isolation of sludge-containing pipelines.

Technical Specifications:

Knife Gate Valve Configurations:

Available configurations include:

• Pneumatic Unidirectional Knife Gate Valve – Designed for isolation primarily in one specified flow direction.

• Pneumatic Bi-Directional Knife Gate Valve – Allows isolation in both flow directions where the valve design supports bidirectional sealing.

Unidirectional and bidirectional designs are selected according to pressure direction, leakage requirements and characteristics of the conveyed medium.

Gate, Seat and Body Details:

Important construction options include:

• Knife Gate: Stainless steel and other suitable grades according to service.

• Seat: Resilient or metal seating depending on temperature, medium and leakage requirements.

• Body: Cast or fabricated construction according to valve design, size, pressure conditions and service requirements.

• Stem: Corrosion-resistant material selected according to operating conditions.

• Bonnet / Gate Enclosure: Open-yoke or enclosed construction may be selected according to valve design, media containment and environmental requirements.

Pneumatic Actuator and Air Supply:

Pneumatic actuator sizing should consider differential pressure across the gate, required gate thrust, packing friction, solids build-up tendency, operating frequency, available air pressure and required fail position.

Single acting actuators use spring return for the designated fail position, while double acting actuators use compressed air for both opening and closing.

Materials and Grades:

Material selection is based on abrasion, solids concentration, particle size, corrosion, temperature and the characteristics of the conveyed medium.

Body, gate, stem, seat and other wetted components should be selected as a compatible material system according to abrasion, corrosion, temperature and process-medium characteristics.

Standards and Testing:

Applicable standards depend on valve construction and project requirements and may include:

• MSS SP-81 – Applicable Knife Gate Valve design and testing requirements.

• ASME B16.34 – Where applicable to the selected construction.

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

• API 6D – Only where a specific pipeline Knife Gate Valve design and project requirement are covered by the standard.

Testing can include:

• Shell pressure testing

• Seat leakage testing

• Valve cycling

• Actuator functional testing

• Material verification

• Dimensional inspection

• Full open/close stroke verification

• Gate travel and limit-position check

• Pneumatic actuator functional test

• Air-supply/function check

• Fail-position test

• Solenoid and limit-switch check where provided

• Packing/sealing inspection

• Operational test under applicable differential-pressure conditions where specified

Share the valve size, differential pressure, process medium, solids concentration/particle characteristics, seat requirement, available air-supply pressure and required fail position with Speciality Valve for Pneumatic Actuated Knife Gate Valve and actuator selection.