Pneumatic three-way control valve

产品概览

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.

应用

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.

主要功能

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

• 端口配置: 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

• 饰边选项: Linear, Equal Percentage, Quick Opening.
• 流量系数 (Cv): 12.5–480 (DN25–DN200).
• Customizable Flow Curves: Tailored to specific process requirements.

Materials & Durability

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

Compatibility

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

运行优势

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.