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Pneumatic Diaphragm Control Valve

Pneumatic Diaphragm Control Valve
  • Nominal Diameter: DN15–DN300 (1/2″–12″)
  • Nominal Pressure: PN10–PN16 (Class150)
  • Air Supply Pressure: 0.4–0.6 MPa
  • Flange Standards: ASME B16.5, JIS B2220, EN1092-1, HG/T 20592, etc.
  • Body Materials: WCB, 304, 316L, PVDF, UPVC, etc.
  • Leakage Class: Class VI (Soft Seat, Bubble-Tight Shutoff)
  • Flow Characteristics: Near-Linear Flow Characteristic (Customized Optimization Available)
  • Process Media & Temperature: Water, neutral gas/liquid, alcohol, oil, fuel, steam, organic solvents, acid and alkaline solutions
  • applicable temperature range: -20°C ~ 120°C
For technical drawings and 3-D models, click on a part number.

Product details

The Pneumatic Diaphragm Control Valve is an advanced automatic regulating valve integrated with an electro-pneumatic valve positioner, providing continuous and precise modulation of valve opening. Driven by compressed air, the valve controls the effective flow area through the movement of a flexible diaphragm and receives a 4–20 mA standard signal from PLC/DCS control systems for accurate regulation of flow, pressure and liquid level.

Inheriting the key advantages of diaphragm valve technology, including zero external leakage without packing, clean and dead-leg-free flow passage design, excellent acid and alkali resistance, and superior anti-clogging performance, this valve is specially designed for hygienic, clean and corrosion-resistant process applications.

The central control system outputs a 4–20 mA current signal according to process requirements and transmits it to the valve positioner. The valve positioner converts the electrical signal into the corresponding pneumatic pressure signal, which is supplied to the actuator chamber to drive the valve stem downward and compress the diaphragm.

The greater the downward movement of the diaphragm, the smaller the throttling gap inside the valve body becomes, resulting in reduced flow capacity. When the valve stem moves upward, the diaphragm returns to its original position, increasing the flow passage area and allowing higher flow rates.

The valve positioner continuously compares the set-point signal with the actual valve stem travel position and automatically adjusts the air pressure output. This ensures stable valve positioning and enables closed-loop continuous control of flow rate and pressure.

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 Diaphragm Valve 150LB PN10-PN16

DNNPSType/ClassPart NoLHDKd1n-LAPlug sizeRated CVStorke
15 0.5G641FBZ-150LBXLXBZ150G05125 487 90 60 35 4-16290 8-150.01-416
20 0.75G641FBZ-150LBXLXBZ150G075135 487 100 70 43 4-16290 1-206 16
25 1G641FBZ-150LBXLXBZ150G1145 493 110 79 51 4-16290 1-2510 16
32 1.25G641FBZ-150LBXLXBZ150G125160 524 115 89 64 4-16290 2-117 16
40 1.5G641FBZ-150LBXLXBZ150G15180 530 125 98 73 4-16290 2-924 25
50 2G641FBZ-150LBXLXBZ150G2210 538 150 121 92 4-18290 2-1944 25
65 2.5G641FBZ-150LBXLXBZ150G25250 686 180 140 105 4-18365 6568 40
80 3G641FBZ-150LBXLXBZ150G3300 706 190 152 127 4-18365 3-2099 40
100 4G641FBZ-150LBXLXBZ150G4350 726 230 191 157 8-18365 4-9175 40
125 5G641FBZ-150LBXLXBZ150G5400 969 255 216 186 8-22470 5-4275 60
150 6G641FBZ-150LBXLXBZ150G6460 969 280 241 216 8-22470 5-29360 60
200 8G641FBZ-150LBXLXBZ150G8570 1009 345 299 270 8-22470 200640 60
250 10G641FBZ-150LBXLXBZ150G10680 1353 405 362 324 12-26597 250900 100
300 12G641FBZ-150LBXLXBZ150G12790 1390 485 432 381 12-26597 3001440 100

Zero External Leakage: Packing-free diaphragm isolation prevents hazardous media leakage and enhances operational safety.

Superior Corrosion Resistance: PTFE/FEP-lined diaphragm options provide excellent compatibility with aggressive chemical fluids.

Hygienic Dead-Leg-Free Design: Smooth internal surfaces support CIP/SIP cleaning and sterile process requirements.

Anti-Clogging Capability: Ideal for viscous fluids, slurry applications and media containing fine solids.

Smooth Modulating Performance: Flexible diaphragm throttling minimizes vibration and hydraulic shock.

Simple Maintenance: Quick diaphragm replacement reduces downtime and maintenance costs.

Reliable Shut-Off: Provides tight sealing performance with extremely low leakage when fully closed.