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Adjusting Stop Valves 免费热线:400-6999912  
Pneumatic Emergency Cut-off Valves

型号:QDQ421F


免费热线:400-6999912

Product Overview

ZJHN pneumatic double-seater diaphragm control valve adopts dual guide structure. It is compact in structure, light in weight, active in operation, large in capacity, accurate in flow and convenient in detachment. It is widely used in accurately controlling set values of parameters of pressure, flow velocity, temperature, liquid level of gas, liquid and steam. 

There are several kinds of this series, standard type, bellows seal type and socket heat insulation type. Pressure grades are PN16, 40, 64. Valve body diameters are DN25 to 400. Applicable fluids’ temperature range is -250℃ to +560℃. Leakage grades are  and . Flow characteristics are linear and percentage. Kinds of types can be chosen from.   


Main Part Materials    Part Names

Material 

Temperature Range

Back Cover 

HT200

-20200℃

ZG230-450

-40450℃

ZG1Cr18Ni9Ti

-250550℃

ZG0Cr18Ni12Mo2Ti

-250550℃

Disc, Seat 

1Cr18Ni9

-250550℃

0Cr18Ni12Mo2Ti

-250550℃

Filler 

PTFE

-40200℃

Diaphragm

Nitrile Rubber Reinforced Dacron

 

Compression Spring

60Si2Mn

 

Diaphragm Cover 

A3

 

 


Specifications
DN (mm)

25

32

40

50

65

80

100

125

150

200

250

300

400

Rated Flow Coefficient (kv)
 

10

16

25

40

63

100

250

250

400

630

100

1600

2700

PN (MPa)

1.6 4.0 6.4

Travel (mm)

16

25

40

63

100

Medium Temperature ()

-40230℃(Normal Temperature)Radiator Type 230450℃(Medium Temperature)Special type -100600℃

Flow Characteristics 

Linear, Equal Percentage

Flange Standard 

 In conformity with JB78-59JB79-59; can also be made to JB/79.1-94JB/79.2-94ANSIJISDIN... 

Body Material

PN
(MPa)

1.6

WCB(ZG230-450) CF3CF8 CF8M

4.0,6.0

WCB(ZG230-450)ZG1Cr18Ni9TiZG0Cr18Ni12Mo2Ti CF8 CF8M

Disc Material 

1Cr18Ni90Cr18Ni12Mo2Ti CF8 CF8M

Back Cover Type 

Normal Type (Normal Temperature), Heat Type (Medium Temperature)

Adjustable Ratio

30:1

Air Supply Adapter

M16×1.5

Note: ANSI, JPI and JIS flange valves are available according to users’ requirements.  

Actuator Parameters 

Type 

ZHA(B)-1

ZHA(B)-2

ZHA(B)-3

ZHA(B)-4

ZHA(B)-5

ZHA(B)-6

Working Area (cm2)

200

280

400

630

1000

1600

Travel (mm)

10

16

25

40

60

1000

Spring Range (KPa)

20100(Standard)201004020020606010080240


Main Technical Parameters 

Spring Pressure
(KPa)

DN

25

32

40

50

65

80

100

125

150

200

250

300

0.14

20-100

5.4

4.4

4.9

3.8

4.7

3.6

2.8

3.75

2.7

2.15

2.0

1.7

0.24

40-200

10.8

8.8

9.8

7.6

9.4

7.2

5.6

7.5

5.4

4.3

4.0

3.4

Note: The using condition is when medium outlet is closed and P2=0


External Diameters 
DN (mm)

25

32

40

50

65

80

100

125

150

200

250

300

L
(mm)

PN1.6MPa

185

200

220

250

275

300

350

410

450

550

670

770

PN4.0MPa

190

210

230

255

285

310

335

425

460

560

740

805

PN6.4MPa

200

210

235

265

295

320

370

440

475

570

750

820

H
(mm)

Normal Type

567

570

645

650

877

887

899

1058

1068

1110

1498

1574

Radiator Type

697

700

775

780

1040

1050

1062

1257

1267

1309

1743

1819

H1(mm)

117

120

139

144

188

208

220

268

278

320

441

503

D(mm)

225

360

470

620

Weight (KG)

33

35

47

51

98

111

148

236

292

433

760

920


Ordering Instructions: 

1. If there are special requirements, the customers should indicate in the contract of the following: 

a. length of structure

b. connection type

c. DN, full size, drawing down, pipe size

d. flowing medium and temperature, pressure range

e. standard and other requirements on testing and inspection

2. We can equip different driving devices according to customers special need. 

3. If the customer supplies specific valve types and models, the customer should describe the exact meaning and requirements of the type, and signed the contract with supplier on a common understanding. 

 


 

 
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