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CN | EN

Double seat control valve (pneumatic)

Technical Parameters

Product model: ZMAN, ZJHN
Nominal diameter: DN25~300mm
Pressure range: PN1.6~6.4MPa
Temperature range: -40 ℃~+450 ℃
Flange size: GB/T9113.2-2000
Valve body form: double seat straight through type
Valve material: WCBZG230-450, ZG1Cr18Ni9Ti
Valve core material: 1Cr18Ni9Ti (304) or Si Ti Lai alloy surfacing welding
Sealing filler: V-type polytetrafluoroethylene (F4), flexible graphite, stainless steel corrugated pipe

Product Details

Product overview
Pneumatic membrane double-seat control valve is composed of multi-spring pneumatic membrane actuator and straight-through double-guided double-seat valve, with compact structure, light weight, sensitive action, small pressure drop loss, large valve capacity, accurate flow characteristics, etc., with compressed air transmission stem spool to achieve the control and adjustment of the flow medium, can realize the automatic adjustment and control of the fluid medium of the process pipeline, suitable for clean medium occasions where the leakage amount is not strict and the pressure difference before and after the valve is large. Widely used in petroleum, chemical, pharmaceutical, metallurgy, power station and other industrial control fields, mainly control gas, liquid, steam and other media.

Structural features
1. The pneumatic membrane actuator is used to configure the positioner to achieve accurate adjustment and control of the process parameters of the fluid medium;
2. Positive action of the actuator: air-closed type-normally open type (when the signal pressure increases, the valve position is displaced), "B type";
3. Actuator reaction: gas-open type-normally closed type (when the signal pressure increases, the valve position is displaced upward), "K type";
4. Double seat plunger type valve core, suitable for large pressure difference, large flow and not very clean medium and leakage requirements are not strict.


Main connection size

DN(mm) 25 32 40 50 65 80 100 125 150 200 250 300
L PN16/25 185 200 220 250 275 300 350 410 450 550 670 770
PN40 190 210 230 255 285 310 355 425 460 560 740 805
PN64 200 210 235 265 295 320 370 440 475 570 750 820
H PN16/25 117 120 139 144 188 208 220 268 278 320 441 503
PN40 124 128 145 150 195 220 230 280 290 335 465 528
PN64 130 135 155 170 205 240 255 295 310 360 480 550
H1 165 185 185 205 245 255 270 335 365 430 560 680
H2 298 298 298 298 380 380 380 510 510 510 650 650
H3 177 177 177 177 182 182 182 182 182 218 218 218
L1 280 280 280 280 350 350 350 475 475 475 560 560
A 282 282 282 282 360 360 360 470 470 470 580 580
D 220 220 220 220 270 270 270 320 320 320 400 400

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