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Single-seat Pneumatic Control Valve, Top Handwheel

Single-seat Pneumatic Control Valve, Top Handwheel
  • Nominal Diameter: DN20–DN300 (3/4″–12″)
  • Nominal Pressure: PN16–PN110 (Class150–Class600)
  • Actuation Method: Pneumatic Diaphragm Actuator with Top-Mounted Handwheel Override
  • Flange Standards: ASME B16.5, JIS B2220, EN1092-1, HG/T 20592, etc.
  • Body Materials: WCB, WC6, WC9, 304, 316L, Hastelloy C, Alloy20, 2205, 2507, 904L, 310S, TA2, etc.
  • Bonnet Types: Standard type, heat dissipation type, low-temperature type, bellows type
  • Flow Characteristics: Equal percentage, linear, quick opening
  • Process Media & Temperature: Water, neutral gas/liquid, alcohol, oil, fuel, steam, organic solvents, acid and alkaline solutions
  • applicable temperature range: -196°C ~ 1000°C
For technical drawings and 3-D models, click on a part number.

Product details

The Pneumatic Control Valve with Top-Mounted Handwheel Override combines automatic pneumatic modulation with reliable manual emergency operation. Under normal operating conditions, the handwheel mechanism is disengaged from the actuator, allowing the valve to receive 4–20 mA DCS/PLC control signals and perform automatic flow, pressure and process regulation without manual interference.

When air supply failure, instrument malfunction or maintenance requirements occur, the integrated top-mounted manual handwheel override system provides direct mechanical control of the valve stem. Operators can manually adjust the valve position from fully closed to fully open, maintaining temporary process operation and improving system reliability.

Designed for industrial applications requiring automatic control with manual backup capability, this pneumatic modulating control valve with handwheel override is widely used in steam systems, chemical processing, power plants, HVAC, petrochemical industries and industrial automation applications.

Working Principle of Pneumatic Control Valve with Top-Mounted Handwheel Override

Automatic Operation Mode (Normal Operating Condition)：During normal automatic operation, the clutch locking mechanism is released, allowing the threaded stem to move upward and disengage from the actuator stem plate. The handwheel mechanism is completely separated from the pneumatic actuator transmission system. The 4–20 mA control signal from the DCS/PLC system drives the pneumatic actuator to move freely and automatically adjust the valve position. In this mode, the handwheel remains stationary and does not rotate with the actuator, ensuring accurate automatic regulation without interference.

Manual Emergency Operation Mode (Air Failure / Instrument Fault / Maintenance)：When the pneumatic supply is interrupted, the control system fails, or maintenance operation is required, the clutch mechanism can be engaged to connect the handwheel drive system with the valve stem. By tightening the clutch structure, the lower end of the threaded stem presses against the actuator diaphragm plate or valve stem, enabling manual valve operation.

  • Clockwise rotation of the handwheel: The threaded stem moves downward, pushing the valve stem downward and reducing the valve opening until fully closed.
  • Counterclockwise rotation of the handwheel: The threaded stem moves upward, lifting the valve stem and increasing the valve opening until fully open.

The valve can be manually positioned at any opening between 0–100% travel, allowing temporary process operation and maintaining system continuity during emergency conditions.

Travel Limiting Function：The traditional top-mounted handwheel design generally provides only one-way travel limitation. It can be used to set the maximum opening position and prevent the valve from exceeding the full-open limit. However, it usually cannot independently adjust the minimum closing position, which limits flexibility in applications requiring precise lower flow control.

Product Specifications

Control valves are used for precise regulation of pipeline flow, pressure, temperature and other process parameters. To ensure correct valve selection and optimal performance, please provide detailed technical data before placing an order. Non-standard sizes and customized designs can be manufactured according to customer requirements.（Unit: mm）

Pneumatic Control Valve Top-Mounted Handwheel 150LB-600LB

DNNPSType/ClassPart NoLHH2H3H4DKd1n-LAPlug sizeRated CVStorke
150.5XJHPBZ-150LBXLXBZ150X051841394366212979060.335.14-162908-150.01-416
200.75XJHPBZ-150LBXLXBZ150X07518413943662129710069.942.94-16290206.316
251XJHPBZ-150LBXLXBZ150X118413943662129711079.450.84-16290251016
321.25XJHPBZ-150LBXLXBZ150X12520515047666132611588.963.54-16290321716
401.5XJHPBZ-150LBXLXBZ150X1522215548166632612598.4734-16290402425
502XJHPBZ-150LBXLXBZ150X2254161487672326150120.791.94-18290504425
652.5XJHPBZ-150LBXLXBZ150X25276220637872417180139.7104.64-18365656840
803XJHPBZ-150LBXLXBZ150X3298234651886417190152.41274-18365809940
1004XJHPBZ-150LBXLXBZ150X4352242659894417230190.5157.28-1836510017540
1255XJHPBZ-150LBXLXBZ150X54002868111133525255215.9185.78-2247012527560
1506XJHPBZ-150LBXLXBZ150X64513458701192525280241.3215.98-2247015036060
2008XJHPBZ-150LBXLXBZ150X86003558801202525345298.5269.78-2247020064060
25010XJHPBZ-150LBXLXBZ150X1065044711781608731405362323.812-26597250900100
30012XJHPBZ-150LBXLXBZ150X1273750412381668731485431.838112-265973001440100
150.5XJHPBZ-300LBXLXBZ300X051841394366212979566.735.14-162908-150.01-416
200.75XJHPBZ-300LBXLXBZ300X07519713943662129711582.642.94-18290206.316
251XJHPBZ-300LBXLXBZ300X119713943662129712588.950.84-18290251016
321.25XJHPBZ-300LBXLXBZ300X12521015047666132613598.463.54-18290321716
401.5XJHPBZ-300LBXLXBZ300X15235155481666326155114.3734-22290402425
502XJHPBZ-300LBXLXBZ300X226716148767232616512791.98-18290504425
652.5XJHPBZ-300LBXLXBZ300X25292220637872417190149.2104.68-22365656840
803XJHPBZ-300LBXLXBZ300X3317234651886417210168.31278-22365809940
1004XJHPBZ-300LBXLXBZ300X4368242659894417255200157.28-2236510017540
1255XJHPBZ-300LBXLXBZ300X54252868111133525280235185.78-2247012527560
1506XJHPBZ-300LBXLXBZ300X64733458701192525320269.9215.912-2247015036060
2008XJHPBZ-300LBXLXBZ300X86203558801202525380330.2269.712-2647020064060
25010XJHPBZ-300LBXLXBZ300X1066044711781608731445387.4323.816-30597250900100
30012XJHPBZ-300LBXLXBZ300X1277550412381668731520450.838116-335973001440100
150.5XJHPBZ-600LBXLXBZ600X051841394366212979566.735.14-162908-150.01-416
200.75XJHPBZ-600LBXLXBZ600X07520613943662129711582.642.94-18290206.316
251XJHPBZ-600LBXLXBZ600X121013943662129712588.950.84-18290251016
321.25XJHPBZ-600LBXLXBZ600X12522015047666132613598.463.54-18290321716
401.5XJHPBZ-600LBXLXBZ600X15251155481666326155114.3734-22290402425
502XJHPBZ-600LBXLXBZ600X228616148767232616512791.98-18290504425
652.5XJHPBZ-600LBXLXBZ600X25311220637872417190149.2104.68-22365656840
803XJHPBZ-600LBXLXBZ600X3337234651886417210168.31278-22365809940
1004XJHPBZ-600LBXLXBZ600X4394242659894417275215.9157.28-2636510017540
1255XJHPBZ-600LBXLXBZ600X54572868111133525330266.7185.78-3047012527560
1506XJHPBZ-600LBXLXBZ600X65083458701192525355292.1215.912-3047015036060
2008XJHPBZ-600LBXLXBZ600X86503558801202525420349.2269.712-3347020064060
25010XJHPBZ-600LBXLXBZ600X1067044711781608731510431.8323.816-36597250900100
30012XJHPBZ-600LBXLXBZ600X128005041238166873156048938120-365973001440100

Simple Structur：The top-mounted handwheel ov features a simple mechanical structure wi

Straight-Line Force Transmission for Stable Sealing：The vertical handwheel design transfers operating force directly along the valve stem centerline, eliminating lateral offset forces. This prevents unnecessary stress on thigh-temperature and high-pressure applica.

Compatible with a Wide Range of Control Valve Applications：The top-mounted handwheel can be installed on various types of control valves, including standard temperature sleeve control valves, high-te. For hygienic valve applications, the t

Easy Valve Position Monit：The integrated top-mounted design is equipped with a clear valve position i, allowing operators to quickly observe the current valve opening position from above for convenient operatio

Easy Retrofit and Field Installation：The valve is designed with reserved mounting interfaces, allowing most existing installed control valves to be easily upgraded with a top-mounted handwheel override system without major modification, red