Pneumatic Diaphragm Double Seated Flow Control Valve (GAZJHN)

August 25, 2025

Model NO.: GAZJHN
Usage: Flow Control
Application: Petroleum, Chemical, Metallurgy, etc.
Applicable Temperature Range: -20 Deg C ~ 200deg C, or -40 Deg C ~ 450 Deg C
Size: Dn25-Dn300
Pressure: Pn1.6-Pn10.0MPa or Class 150lb - Class 600lb
Trademark: Goole or OEM
Transport Package: Plywood Case
Specification: ISO 9001
Origin: Wenzhou, Zhejiang, China
HS Code: 8481804090
GAZJHN Pneumatic diaphragm double-seated flow control valve.
This is a pneumatic diaphragm double-seated flow control valve designed for precise regulation of fluid flow in various industrial applications. The double-seat design ensures balanced pressure and minimal unbalanced force, making it ideal for use in the petroleum, chemical, pharmaceutical, metallurgical, and power generation industries. It can effectively manage both gas and liquid media, including steam.

Pneumatic Diaphragm Double Seated Flow Control Valve (GAZJHN)
GAZJHN Pneumatic Diaphragm Double Seated Pressure Flow Valve Structure
Valve Body.
Structure: Globe valve with double seats, allowing fluid to pass through the upper and lower sealing surfaces.
DN: 25~300mm.
PN: 1.6~10.0Mpa or Class 150~Class 600.
Connections: Flanged type.
Material: WCB, HT200, ZG230-450, ZG1Cr18Ni9Ti, ZG0Cr18Ni12Mo2Ti.
 
Upper Cover.
Normal Temp: -20°C ~ +200°C.
Heat Radiation Type: -40°C ~ +450°C.
Gland Connection: Bolted type.
Packing: V-type PTFE, Flexible Graphite, S.S Bellows.
 
Valve Assembly.
Valve Core: Double guiding & double-seated plug type.
Cv Features: Linear, Equal Percentage, or Quick Opening.
Material: 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti.
 
Pneumatic Diaphragm Double Seated Flow Control Valve (GAZJHN)
Actuator.
Model: Multi-spring diaphragm type actuator.
Diaphragm Material: NBR with reinforced polyester fabric.
Spring Range: 0.02~0.1 / 0.04~0.2 Mpa.
Air Supply: 0.14 / 0.16 / 0.28 Mpa.
Air Supply Connector: M10*1.
Working Temp: -30~+70°C.
Valve Acting Type: Air to Close or Air to Open.
Accessories: Positioner, Hand Wheel.
Parameters (with positioner):
Leakage: <0.5%×Kv.
Intrinsic Error: +/-1.5%.
Controlling Range: 30:1.

GAZJHN Pneumatic Diaphragm Double Seated Flow Control Valve Specifications
Kv, Movement & Allowable Differential Pressure.
DN(mm) 25 32 40 50 65 80 100 125 150 200
Size of seat(mm) 15 20 25 32 40 50 65 80 100 125 150 200
Flow coefficient Kv 4 6.3 10 16 25 40 63 100 160 250 400 630
Movement(mm) 16 25 40 60
Allowable differential pressure(Mpa) 5.8 4.9 3.8 2.9 4.0 3.3 2.6 3.6 3.0 2.3
Note: It refers to the differential pressure when the valves are in the open position.
 
Pneumatic Double Seated Flow Control Valve Dimension.
Pneumatic Diaphragm Double Seated Flow Control Valve (GAZJHN)
 
DN Actuator H øA H1 L
Normal TEMP Heat Radiator Type. PN1.6 PN4.0 PN6.4
25 ZHA22 498 648 285 117 185 190 205
32 ZHA22 501 651 285 120 200 210 220
40 ZHA22 522 691 285 139 220 230 240
50 ZHA22 530 699 285 144 250 255 265
65 ZHA34 645 815 363 188 275 285 295
80 ZHA34 661 835 363 208 305 310 325
100 ZHA34 687 887 363 220 350 355 370
125 ZHA34 1234 1444 363 270 410 425 440
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