Pneumatic Actuated Knife Gate Valve

African Valve, a Pneumatic Actuated Knife Gate Valve Supplier in South Africa, provides pneumatic actuated knife gate valves that combine the compact knife-gate design with compressed-air operation. These valves are suitable for mining, mineral processing, slurry handling, wastewater treatment, chemical processing, power generation and other industrial applications where automated isolation is required.

Available configurations can include different valve sizes, body and lining materials, pressure ratings, sealing arrangements and pneumatic actuator options according to the process conditions.

Engineering Design & Operation

A knife gate valve uses a flat, precision-machined gate that moves linearly through the valve body. As the valve closes, the gate travels through the process medium before engaging with the sealing arrangement. This makes the design useful for certain slurry, sludge and solids-containing services.

The body may be supplied in wafer, lug or flanged configurations, depending on the valve design and piping arrangement. Elastomer sleeves or liners can also be used in slurry applications to improve sealing and protect valve components from abrasive media.

The pneumatic actuator converts compressed-air pressure into the linear movement needed to operate the gate. Double-acting actuators use air for both opening and closing, while spring-return arrangements can provide a defined fail position where the valve and actuator are designed for it.

Key Features

• Pneumatic automated operation
• Fast opening and closing
• Remote PLC, DCS or SCADA integration
• Knife-edge gate for solids-containing media
• Wafer, lug and flanged configurations
• Uni-directional or bi-directional designs
• Abrasion-resistant lining options
• Double-acting or spring-return actuators
• Limit switches and position indication
• Solenoid valve compatibility
• Manual override where specified

Technical Specifications

Materials & Components

• Body: Cast Iron, Ductile Iron, Carbon Steel or Stainless Steel
• Gate: Stainless Steel, Duplex or Hardened Alloy Steel
• Lining: Natural Rubber, EPDM, Polyurethane or PTFE
• Seat: EPDM, NBR, PTFE, Polyurethane or Metal
• Stem: Stainless Steel or Alloy Steel
• Packing: PTFE, Graphite or suitable synthetic packing
• Actuator: Pneumatic double-acting or spring-return actuator
• Accessories: Solenoid valve, limit switch, position indicator and air filter regulator

Standards

Applicable requirements may include MSS SP-81, API 598, EN 12266 and relevant project or manufacturer standards, depending on the specific valve design.