ZJHN Pneumatic diaphragm double-seated control valve
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ZJHN Pneumatic Diaphragm double seated Control Valve
The Valve has double seats. The fluid outflow through the valve core of the upper and lower sealing surface. The unbalanced pressure is small. It is a balanced structure, which are widely used in petroleum, chemical, pharmaceutical, metallurgical, power plants, such as the industrial sector, to control of gas liquid medium such as steam.
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◆ Valve Body
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Valve Body: Flowing through type globe valve with double-seated
DN：25~300mm
PN：PN1.6- 10.0MPa or Class 150 – Class 600
Connections：Flanged Type
Material: WCB, HT200 ZG230—450 ZG1Cr18Ni9Ti ZG0Cr18Ni12Mo2Ti
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◆ Upper Cover
Normal Temp:-20℃~+200℃
Heat Radiation Type.:-40℃~+450℃
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
◆ Actuator
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Model: Multi-Spring Diaphragm type Actuator
Material of the Diaphragm: NBR with reinforced polyester fabric
Spring Range：0.02~0. 1、0.04~0.20MPa
Air Supply：0.14 0.16 0.28MPa
Air Supply Connector：M10×1
Working Temp.：-30~+70℃
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Valve Acting Type: Air to Close or Air to Open
Accessories: Positioner, hand wheel
Parameters: ( with Positioner)
Leakage: ﹤0.5% x Kv
Intrinsic Erro: ±1.5%
Controlling Range: 30:1
◆ Kv, Movement & Allowable Differential Pressure
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DN（mm）
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25
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32
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40
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50
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65
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80
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100
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125
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150
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200
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Size of Seat(mm)
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15
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20
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25
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32
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40
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50
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65
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80
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100
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125
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150
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200
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Flow Coefficient Kv
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4
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6.3
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10
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16
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25
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40
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63
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100
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160
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250
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400
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630
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Movement (mm)
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16
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25
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40
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60
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Allowable Differential Pressure（MPa）
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5.8
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4.9
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3.8
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2.9
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4.0
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3.3
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2.6
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3.6
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3.0
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2.3
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Note: It refers to the Differential Pressure when the valve in open position.
◆ Double Seated Control Valve Dimension
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DN
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Actuator
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H
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ΦA
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H1
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L
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Normal Temp
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Heat Radiator Type
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PN1.6
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PN4.0
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PN6.4
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25
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ZHA22
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498
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648
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285
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117
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185
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190
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205
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32
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ZHA22
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501
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651
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285
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120
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200
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210
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220
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40
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ZHA22
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522
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691
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285
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139
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220
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230
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240
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50
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ZHA22
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530
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699
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285
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144
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250
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255
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265
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65
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ZHA34
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645
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815
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363
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188
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275
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285
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295
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80
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ZHA34
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661
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835
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363
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208
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305
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310
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325
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100
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ZHA34
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687
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887
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363
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220
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350
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355
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370
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125
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ZHA34
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1234
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1444
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363
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270
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410
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425
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440
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150
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ZHA45
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1242
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1492
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470
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280
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450
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460
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475
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200
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ZHA45
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1394
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1654
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470
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320
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550
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560
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570
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