Products > Control valve > Pneumatic two-seat control valve

Pneumatic two-seat control valve

Model: ZJHN
Nominal diameter: DN25 ~ 400mm
Nominal pressure: PN16 ~ 64MPa
Temperature: -250 ℃ ~ + 560 ℃
Main material: HT200, ZG230-450, ZG1Cr18Ni9Ti, ZG0Cr18Ni12Mo2Ti
Medium gas, liquid, vapor, etc.: Medium
Drive mode: pneumatic
Design criteria: GB / T17213
Flange standard: GB / T9113, JB / T79 , HG20594 and other standard
Inspection standards: GB / T4213
Form connect: flange (FF RF RTJ), welding (SW BW), thread ( Suitable for 1 "or less
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First, the pneumatic two-seat control valve overview

ZJHN pneumatic two-seat control valve with double-guided structure, equipped with multi-spring recruit agencies. Has the advantages of compact structure, light weight, action sensitive, large valve capacity, accurate flow characteristics, easy disassembly. Pneumatic two-seat control valve is widely used in precise control of gas, liquid, steam and other media process parameters such as pressure, flow, temperature, liquid level at a given value. Particularly suitable for large pressure drop, allowing greater leakage and not very clean media occasions.

Pneumatic two-seat control valve products are standard, bellows sealed, jacket insulation and other varieties. Product nominal pressure rating PN16, 40, 64; body diameter range DN25 ~ 400. Applicable fluid temperature -250 ℃ ~ + 560 ℃ range of a variety of grades. Leakage standards for grade Ⅲ and Ⅳ. Flow characteristics are linear or percentage. A wide variety of specifications to choose from.


 Second, pneumatic two-seat control valve main parts and materials

Part Name

material

temperature range

Body valve cover

HT200

-20 ~ 200 ℃

ZG230-450

-40 ~ 450 ℃

ZG1Cr18Ni9Ti

-250 ~ 550 ℃

ZG0Cr18Ni12Mo2Ti

-250 ~ 550 ℃

Spool, seat

1Cr18Ni9

-250 ~ 550 ℃

0Cr18Ni12Mo2Ti

-250 ~ 550 ℃

filler

Teflon

-40 ~ 200 ℃

Diaphragm

NBR rubber reinforced polyester fabrics


compressed spring

60Si2Mn


Membrane cover

A3


 

Third, pneumatic two-seat control valve main technical parameters

Nominal diameter 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

Nominal pressure MPa

1.6 4.0 6.4

Travel mm

16

25

40

63

100

Medium temperature ℃

-40 ~ 230 ℃ (room temperature type), heat sink 230 ~ 450 ℃ (medium temperature), special order -100 ~ 600 ℃

Flow characteristics

Straight line, equal percentage

Flange standard

In line with JB78-59, JB79-59 standards, according to JB / 79.1-94, JB / 79.2-94, ANSI, JIS, DIN and other standard production orders

Body material

PN (MPa)

1.6

WCB (ZG230-450) CF3CF8 CF8M

4.0,6.0

WCB (ZG230-450), ZG1Cr18Ni9Ti, ZG0Cr18Ni12Mo2Ti CF8 CF8M

Spool material

1Cr18Ni9,0Cr18Ni12Mo2Ti CF8 CF8M

On the bonnet type

Ordinary type (normal temperature type), hot type (medium temperature type)

Adjustable ratio

30: 1

Air source connector

M16 × 1.5


 Fourth, pneumatic two-seat control valve pneumatic actuator

model

ZHA (B) -1

ZHA (B) -2

ZHA (B) -3

ZHA (B) -4

ZHA (B) -5

ZHA (B) -6

Effective area of cm2

200

280

400

630

1000

1600

Travel mm

10

16

25

40

60

1000

Spring range KPa

20 to 100 (standard); 20 to 100, 40 to 200, 20 to 60, 60 to 100, 80 to 240


 Fifth, pneumatic two-seat control valve pneumatic actuator main technical performance indicators

project

Index value

Basic error%

Without locator

± 5.0

With locator

± 1.0

Backlash%

Without locator

3.0

With locator

1.0

dead zone%

Without locator

3.0

With locator

0.4

Permissible leakage L / h

1 × 10-3 × valve rated capacity


Sixth, pneumatic two-seat control valve actuator allows pressure

Supply pressure MPa

Spring pressure KPa

Nominal diameter

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 condition of use is P2 = 0 when the stem is out of the media outlet.
 

Seven, pneumatic two-seat control valve dimensions

Public Path (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

Heat sink 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