29/07/2026
Pneumatic Control Globe Valve
For Modulating & Throttling Service
Product Description
A pneumatic control globe valve uses compressed air to operate a globe valve body via a pneumatic diaphragm or piston actuator. It’s designed for precise flow control, throttling, and regulation of steam, water, gas, oil, and chemicals.
The linear motion of the globe design gives excellent control characteristics vs on/off ball/butterfly valves.
Key Features
Precise Control: Linear globe trim gives equal % or linear flow characteristic. Great for PID loops.
Pneumatic Actuator: Diaphragm type for 2"-6". Piston type for high thrust/ high pressure. Failsafe options: Air-to-Open / Air-to-Close.
Tight Shut-off: Cage guided or post guided plug with soft seat PTFE/PEEK option for bubble-tight sealing.
Quick Response: Actuator with positioner gives 4-20mA control signal for accurate modulation.
Anti-Cavitation & Noise Trim: Multi-stage cage available for high dP steam/water service.
Bellows Seal Option: For fugitive emission control in toxic/steam service.
Technical Specifications
Valve Type: Globe Control Valve, Pneumatic Actuated
Body Material: WCB, WC6, WC9, CF8, CF8M, LCB
Actuator: Multi-spring Diaphragm / Piston. Air Supply 3-7 bar / 40-100 PSI
Pressure Class: Class 150 / 300 / 600 / 900
Size Range: 1/2" to 16". Larger on request
End Connection: Flanged RF/RTJ, Butt Weld
Trim: SS316, SS316L, Stellite. Cage guided
Seat: Metal / Soft PTFE / PEEK
Flow Characteristic: Equal % / Linear / Quick Opening
Accessories: Smart Positioner 4-20mA, I/P Converter, Air Filter Regulator, Limit Switch, Solenoid Valve
Standards: ASME B16.34, IEC 60534, API 623Temperature: -46°C to +540°C depending on packing/bonnet
Working Principle
Control Signal 4-20mA → I/P Positioner converts to 3-15 PSI air
Air to Actuator Diaphragm → Thrust moves stem up/down
Plug moves in Cage/Seat → Changes flow area to control dP and flow rate
Failsafe: On air failure, spring returns valve to
FO/FC position
FO vs FC
Air to Open, Spring to Close (FC): Fails closed. Used for steam, fuel
Air to Close, Spring to Open (FO): Fails open. Used for cooling water
Typical Applications
Boiler feed water control, steam pressure/temperature control, chemical dosing, HVAC, process industry, power plants, oil & gas.
Globe vs Ball for Control
Sir, to quote/specify the right valve I need 4 points:
Size & Class: e.g. 3" Class 300Service: Steam / Water / Gas / Chemical
Fail Action: Fail Open or Fail Close
Accessories: With Positioner? AFR? Limit switch?
Want me to make a datasheet + sizing sheet or short quotation spec for you?
www.usmanivalves.com
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9833868523
