Pneumatic single seat control valve

Product Overview

The Pneumatic Single Seat Control Valve is a high-performance regulating valve designed for precise control of fluid pressure, flow rate, or temperature. Driven by a pneumatic actuator and featuring a single-seat plug structure, it offers compact design, rapid response, and exceptional reliability in demanding industrial environments such as oil and gas, chemical processing, and power generation, especially in explosion-proof applications.

Applications

Chemical Industry: Precise proportioning and flow control of corrosive media (acids, alkalis).

Oil & Gas: Pressure regulation in pipelines and liquid level control in separators.

Power Systems: Boiler feedwater and steam flow regulation.

Pharmaceutical & Food: Sterile fluid control and temperature regulation.

Key Features

Pneumatic Actuator:

• • Types: Spring-return diaphragm or piston actuators, with fail-open (FO) or fail-close (FC) modes.
  • Air Supply: Standard 0.2–1.0 MPa (20–100 psi), response time <1 second.
  • Explosion-Proof Certification: ATEX, IECEx (Zone 1/2) for hazardous areas.

Single-Seat Valve Design:

• • High Sealing Performance: ANSI Class IV or VI leakage rates for critical shut-off applications.
  • Pressure Differential Limitation: Suitable for medium/low ΔP (≤6.9 MPa) to avoid excessive unbalanced forces.

Flow Characteristics:

• • Linear, Equal Percentage, or Quick Opening trim options, with customizable flow curves.
  • Flow Coefficient (Cv): 0.01–120, covering low to high flow requirements.

Materials & Durability:

• • Body Materials: Carbon steel (WCB), stainless steel (304/316L), duplex steel (UNS S32205).
  • Plug & Seat: Stellite hardfacing or ceramic coating for wear and cavitation resistance.
  • Seals: PTFE, graphite, or metal bellows for temperatures from -40°C to 450°C.

Compatibility:

• • Signal Input: 4–20 mA, 3–15 psi pneumatic signals; supports HART communication.
  • Accessories: Positioners, solenoid valves, limit switches, air filter regulators.

Operational Advantages

Rapid Response: Millisecond-level adjustments via pneumatic actuation.

Explosion Safety: Spark-free design with ATEX/IECEx certification.

Easy Maintenance: Modular design for quick replacement of plugs and seals.

Cost Efficiency: Lower operational costs compared to electric valves.