Pneumatic three-way adjustment valve

Pneumatic control valve is a high-precision automatic control valve driven by pneumatic actuator, widely used in petroleum, chemical, electric power, metallurgy, pharmaceutical and environmental protection and other working conditions. The valve is suitable for water, steam, gas, oil and various corrosive media, with excellent corrosion resistance and sealing performance. Pneumatic control valves drive the actuator through pneumatic pressure to achieve precise adjustment of the spool, control flow, pressure and temperature, fast response speed, stable control, suitable for complex automation control systems. The advantages of the product include compact structure, high adjustment precision, long life, easy maintenance, and a wide range of adaptability. Pneumatic control valves support a variety of control signal input, easy to integrate with DCS, PLC system to realize remote intelligent control. Its efficient and stable performance effectively improves the safety and automation level of industrial production process, and is an indispensable and important control equipment for modern industrial piping system.

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products

Pneumatic three-way adjustment valve

Model: ZMAQ, ZMAX

Subtitle：Pneumatic diverter/mixer valve

The Pneumatic 3-Way Control Valve is an industrial grade flow management solution designed for precision mixing and diverting operations. The valve utilizes a toggle-type pneumatic actuator and modular valve internals designed to provide sub-second response times and superior reliability under extreme conditions. It is designed for chemical plants, HVAC systems and energy...

Classification:Pneumatic Control Valve

Working conditions:chemical plant, construction work

Product Overview

The Pneumatic 3-Way Control Valve is a high performance flow control solution designed for precise mixing and diverting operations in industrial processes. Featuring a diaphragm-type pneumatic actuator and modular valve internals design, the valve 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 regulation.

working condition

Chemical treatment: dynamic mixing of reaction media (acid-base neutralization).

Pharmaceutical HVAC: cleanroom pressure balancing and sterile air control.

District heating: heat distribution in secondary pipe networks.

Water treatment: multi-tank chemical dosing and backflow prevention.

Main characteristics

Pneumatic Thin Film Actuators
Type: spring return (fail-safe) or double acting.
Gas source: 0.2-0.6 MPa (30-90 psi), response time <3 seconds.
Ex approval: ATEX II 2G Ex d IIC T6 / IECEx (Zone 1 compliant).
Diaphragm material: EPDM, Buna-N or Viton (temperature range: -40°C to 150°C).

Three-way valve design
Port Configuration: ISO 5752-compliant L-port (shunt)/T-port (hybrid).
High sealing performance: ANSI Class IV (standard) / Class VI (optional).
Differential Pressure Limit: For ΔP ≤ 6.9 MPa.

Flow Rate Characteristics
Valve insert options: linear, equal percentage, fast open.
Flow coefficient (Cv): 12.5-480 (DN25-DN200).
Customizable flow curves: tailored to specific process requirements.

Materials and Durability
Valve body material: 316L stainless steel (ASTM A351 CF8M).
Inner part material: Stellite alloy 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 signal.
Communication protocol: HART 7 / Modbus RTU.
Accessories: positioners, solenoid valves, limit switches.

Product Advantages

Corrosion resistance: 90° angle design minimizes particle impact.

High differential pressure handling: multi-stage valve internals with pressure drops up to 6.9 MPa.

Explosion-safe: ATEX/IECEx certified for use in hazardous areas.

Low maintenance: top entry design for easy replacement of valve internals.

Comparison with motorized control valves

specificities	pneumatic	electric powered
responsiveness	<3 seconds	5-15 seconds
flameproof	intrinsic safety	Requires explosion-proof enclosure
heat-resistant	Up to 150°C (diaphragm)	Up to 250°C
maintenance cost	Low (no electronics)	High (servo motor replacement)

Selection Guide

High differential pressure: Select multi-stage anti-cavitation valve internals.

Corrosive media: Select tungsten carbide or ceramic valve internals.

High Cycle: Rotary seat design with over 100,000 cycles.

Cryogenic applications: Extended bonnet for liquefied natural gas (LNG) applications.

Medium of use

working condition

chemical plant, construction work

summarize

Pneumatic 3-way control valves provide fast response, explosion-proof safety and reliability in demanding industrial environments. Its modular design ensures superior shutoff performance while minimizing downtime. Whether handling corrosive fluids or high-temperature steam, the valves provide precise, stable control for critical applications in the chemical, oil and gas, and power industries.

Product Parameters

Nominal diameter	DN25-DN200 (1"-8")
Nominal pressure	PN25-PN63 (Class 150-300)
temperature range	-40°C to 150°C (diaphragm) / -196°C to 550°C (body)
leakage rate	ANSI Class IV (standard) / Class VI (optional)
Supply pressure	0.4-0.7 MPa (60-100 psi)
response time	<3 seconds
sealing material	All-metal bellows (standard) / PTFE (optional)