Specification

WCB Pneumatic Actuator Air-Operated Flat Parallel Sliding Gate Valve

I. Product Overview: Efficient Choice for Automated Fluid Interception

NEWWAY’s WCB pneumatic actuator flat parallel sliding gate valve is specially designed for automated fluid control in industrial scenarios such as petroleum, chemical, and water treatment. Constructed with a WCB cast steel (ASTM A216) body and flat gate structure, the valve achieves remote or automatic on-off via a pneumatic actuator, suitable for pressure classes 1.6~6.4MPa (Class 15~90) and temperature ranges of -29℃~425℃. Its core advantages lie in the low-flow resistance of the parallel sliding gate and the fast response of pneumatic drive, stably controlling the interception and flow of media like water, crude oil, natural gas, and particle-containing fluids—particularly suitable for pipeline systems requiring frequent operation or automation integration.

II. Key Attribute Parameters: Comprehensive Technical Specifications

Product Overview

III. Core Features: Dual Optimization of Structure and Drive

Flat Parallel Sliding Gate Design
The gate adopts a parallel double-gate structure, achieving bi-directional sealing through close fit between two side sealing surfaces and seats, with uniform sealing specific pressure—suitable for media containing small particles or impurities. The full-bore flow path design reduces the flow resistance coefficient by 30% compared to wedge gate valves, with pressure drop of only 0.15bar in DN300 pipelines, minimizing pumping energy consumption.

High-Efficiency Pneumatic Actuator Drive
Equipped with a fork-type pneumatic actuator for stable torque output, no-load opening/closing time ≤5s (DN200), supporting 4~20mA signal feedback and PLC linkage. Explosion-proof actuators (Ex d IIB T4) are optional for flammable environments, with protection class reaching IP66.

Multi-Scenario Sealing Solutions

Main Seal: Metal+soft seal combination (e.g., stainless steel+PTFE) between gate and seat, complying with API 598 bubble-tight standard (leakage rate ≤0.1×DN mm³/s);

Auxiliary Seal: Stem uses double seals of V-type packing+O-ring with blowout-proof design, ensuring no external leakage under high pressure.

Operation and Maintenance Convenience
The pneumatic actuator is equipped with a manual override device for manual operation during air supply failure; the valve cavity has a drain port for regular impurity cleaning, extending seal life. Valves below DN500 allow in-line maintenance for seal replacement without pipeline disassembly.

IV. Manufacturing Processes: Precision Control from Material to Finished Product

Cast Steel Body Molding Process

WCB material uses resin sand precision casting with pouring temperature controlled at 1550℃~1600℃; blanks are annealed at 900℃ to eliminate stress, with ultrasonic testing (UT) showing internal defect rate ≤0.5%;

Body and gate blanks undergo aging treatment to reduce machining deformation, with dimensional tolerance controlled within ±0.3mm (<DN100).

Actuator Assembly and Testing

Pneumatic actuator cylinders are die-cast from aluminum alloy, with inner surfaces hard anodized to reduce friction coefficient by 40%;

After assembly, each valve undergoes 1.5x design pressure shell strength testing (30-min hold) and 1.1x pressure sealing testing (15-min hold), with soap water for external leakage detection.

Surface Treatment and Coating

Carbon steel bodies are sandblasted (Sa2.5 grade) and sprayed with epoxy zinc-rich primer (dry film thickness ≥80μm), topcoated with polyurethane anti-corrosion coating (total thickness ≥200μm);

Stainless steel components undergo electropolishing with surface roughness Ra≤0.8μm, suitable for food-grade or corrosive media scenarios.