Pneumatic three-way control valve

Product Overview

The Pneumatic Three-Way Control Valve is a high-performance flow control solution designed for precise mixing and diverting operations in industrial processes. Featuring a diaphragm-style pneumatic actuator and a modular trim design, it ensures reliable operation in demanding environments such as chemical plants, HVAC systems, and energy facilities. Its unique design minimizes turbulence and erosion, making it ideal for applications requiring explosion-proof compliance and high-frequency adjustments.

Applications

Chemical Processing: Dynamic blending of reactive media (acid-base neutralization).
Pharmaceutical HVAC: Cleanroom pressure balancing and sterile air control.
District Heating: Thermal energy distribution in secondary networks.
Water Treatment: Multi-tank chemical dosing and backflow prevention.

Key Features

Pneumatic Diaphragm Actuator

• Types: Spring-return (fail-safe) or double-acting.
• Air Supply: 0.2–0.6 MPa (30–90 psi), response time <3 seconds.
• Explosion-Proof Certification: ATEX II 2G Ex d IIC T6 / IECEx (Zone 1 compliant).
• Diaphragm Material: EPDM, Nitrile, or Viton (temperature range: -40°C to 150°C).

Three-Way Valve Design

• Port Configuration: L-port (diverting) / T-port (mixing) per ISO 5752.
• High Sealing Performance: ANSI Class IV (standard) / Class VI (optional).
• Pressure Differential Limitation: Suitable for ΔP ≤6.9 MPa.

Flow Characteristics

• Trim Options: Linear, Equal Percentage, Quick Opening.
• Flow Coefficient (Cv): 12.5–480 (DN25–DN200).
• Customizable Flow Curves: Tailored to specific process requirements.

Materials & Durability

• Body Materials: 316L Stainless Steel (ASTM A351 CF8M).
• Trim Materials: Stellite 6, Tungsten carbide, or ceramic coating.
• Seals: Graphite, PTFE, or metal bellows (-196°C to 550°C).

Compatibility

• Signal Input: 4–20 mA, 0.2–1.0 bar pneumatic signals.
• Communication Protocols: HART 7 / Modbus RTU.
• Accessories: Positioners, solenoid valves, limit switches.

Operational Advantages

Erosion Resistance: 90° angle design minimizes particle impact.

High ΔP Handling: Multi-stage trim for pressure drops up to 6.9 MPa.

Explosion Safety: ATEX/IECEx certified for hazardous areas.

Low Maintenance: Top-entry design for easy trim replacement.

Comparison with Electric Valves

Selection Guidelines

High ΔP: Opt for multi-stage anti-cavitation trim.

Erosive Media: Choose tungsten carbide or ceramic trim.

High Cycling: Rotary seat design for 100,000+ cycles.

Cryogenic Service: Extended bonnet for LNG applications.