1421型气动薄膜低温角形单座调节阀

55

Product

BAIC GROUP

1421 Type Pneumatic Membrane Low Temperature Angle

Single-Seat Regulator

1421 Type pneumatic membrane low temperature angle single-seat regulator is a regulator for use in low

temperature, deep-cooling occasions. Adopts long-neck bonnet insulation, equipped with multi-spring actuator, it

has the advantages of compact overall structure, light weight, good stability etc. The valve body adopts

precision casting angle structure (or forging), the material is LF4 (aluminum), with good low temperature

resistance. The bellows sealed ensures that the regulator does not leak in low temperature occasions. Therefore

, it is widely used in metallurgy, air separation, oxygen production, petroleum, chemical industry and other lowtemperature, deep-cooling occasions. Particularly suitable for precise control of low temperature gases and

liquids (e.g. liquid oxygen, liquid nitrogen, liquid argon, etc.) to keep the process parameters at a given value.

This series of products have two kinds: connecting plate mounting type and floating sleeve mounting type,

with nominal pressure level of PN0.6MPa, valve body caliber range of DN20~100, suitable for a variety of

grades within the range of fluid temperature -60℃~-250℃, and leakage level of Class IV and Class VI, and the

flow characteristics of linear or equal percentage.

Characteristics

· Bottom inlet and side outlet, simple flow path, low resistance, large

valve capacity

· Double-guide for good valve stability

· Large adjustable range, intrinsic adjustable ratio of 50

· Bellows sealed provides a complete seal against a moving valve

stem, blocking fluid leakage

· Adopts connecting plate or floating sleeve mounting type, which

can be flexibly selected by users and design institutes.

I. Connecting plate mounting type

1. Valve body 2. Valve core 3. Valve stem 4. Guide sleeve 5. Bellows 6. Long-neck bonnet

7. Connecting plate 8. Actuator

II: Floating sleeve mounting type

1. Valve body 2. Valve core 3. Guide sleeve 4. Valve stem 5. Floating sleeve 6. Long-neck bonnet

7. Bellows 8. Connecting plate 9. Actuator

Nominal diameter

DN (mm)

D0 D1 D2

-60～-100 -100～-200 -200～-250

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500

Product

700

BAIC GROUP

900

65～100 600 800

Main parts materials

Valve body: LF4

Bonnet: 0Cr18Ni9

Valve stem: 304/316/316L

Bellows: 304/316/316L

1000

Valve core, valve seat: 304/316/316L/17-4PH Gasket: red copper, 0Cr18Ni9

Specifications and technical parameters

Nominal diameter DN (mm) 20

25 32 40 50 65 80 100 Valve seat diameter dn (mm) 10 12 15 20

Rated flow rate

Coefficient (Kv)

Linear 1.8 2.8 4.4 6.9 11 17.6 27.5 44 69 110 176

Equal percent 1.6 2.5 4.0 6.3 10 16 25 40 63 100 160

Rated stroke(mm) 16 25 40

Effective membrane area Ae(cm²) 280 400 600

Intrinsic flow characteristics Linear, equal percentage

Nominal pressure PN(MPa) 0.6, 1.0, 1.6

Intrinsic adjustable ratio (R) 50

Operating temperature (℃) D0

:-60～-100,D1

:-100～-200,D2

:-200～-250

Signal range (KPa) 20～100,40～200,80～240

Allowable leakage amount Class IV Class VI (GB/T4213-92)

Air source pressure (MPa) 0.14/0.25/0.40

1. Performance indicators of this product implement GB/T4213-92

2. Other pressure levels and valve calibers can be designed according to customer needs.

Mounting dimensions selection standard

Temperature range

Insulation length (℃)

(mounting dimensions)

H1

(mm)

20～50

Size H1

(insulation length) is recommended by the general design size of the air separation industry,

the design institute and the use of units can be specified according to need, if not specified, our company

will manufacture according to the above dimensions

Connection dimensions and standards

· Connection method: welding

· Pneumatic membrane actuator air signal interface: internal thread M10x1 (DN20-100),

M16×1.5 (DN125-200)

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Product

BAIC GROUP

Allowable differential pressure

Air-to-open type

Effective membrane area Ae (cm²) 280 400 600

Signal range Pr (KPa) 20-100 40-200 20-100 40-200 20-100 40-200

Air source pressure Ps (MPa) 0.14 0.25 0.14 0.25 0.14 0.25

Accessory required - P - P - P

Nominal diameter

DN (mm) and

valve seat

diameter dn (mm)

20

10 5.35 6.40

12 3.72 6.40

15 2.38 5.55

20 1.34 3.12

25 25 0.86 2.00

32 32

Effective membrane area Ae (cm²)

0.75

280

1.74

400 600

Signal range Pr(KPa)

40

20-100

25

20-100 40-200 20-100

1.22

20-100

2.85

40-200 20-100 20-100

32

40-200

Air source pressure Ps(MPa) 0.14

0.75

0.14

1.74

0.25 0.14 0.14

40

0.25 0.14 0.14

0.48

0.25

1.11

Accessory required - P

50

P

32

- P P

0.75

-

1.74

P P

Nominal diameter

DN (mm) and valve

seat diameter dn

(mm)

40

20

10 5.35

0.48

6.40

1.11

6.40

50 0.31 0.71

12 3.72 6.40

65

6.40

65 0.27 0.63

15

80

2.33

50

5.55 6.40

0.46 1.07

65

20 1.34 3.12 4.01

0.27 0.63

80

25

0.18

25

0.42

0.86

100

2.00

65

2.57

0.27 0.63

80

32 32

0.18

0.75

0.42

1.74

100

2.24

40

0.11

25

0.23

80-240KPa spring is 2 times the allowable differential pressure of 40-200KPa spring

Air-to-close type

1.22 2.85 3.67

32 0.75 1.74 2.24

40 0.48 1.11 1.48

50

32 0.75 1.74 2.24

40 0.48 1.11 1.48

50 0.31 0.71 0.91

65 65 0.27 0.63 0.81

80

50 0.46 1.07 1.38

65 0.27 0.63 0.81

80 0.18 0.42 0.52

100

65 0.27 0.63 0.81

80 0.18 0.42 0.52

100 0.11 0.26 0.34

1. P: Valve positioner 2. Allowable differential pressure exceeding the above values can be

informed to the technical department of the company to solve the problem separately.

58

Product

BAIC GROUP

Outline dimensions

diameter (DN)

Nominal 20

25 32 40 50 65 80 100

diameter (dn)

Valve seat 0 2 5 20

A 280 308 395

L 75 85 110 160 170

L1 75 85 110 150 170

H1

H

=500 952 971 980 1006

H1=600 1250

H1=700 1152 1171 1181 206

H1=800 1450

H1=900 1352 1371 1381 1406

H1=1000 1650

n-d 8-Φ14 8-Φ16 10-Φ16 12Φ18

D3 260 285 305 340 370 405 460

D4 290 315 335 370 400 435 490

D5 289 470

With top-mounted handwheel mechanism valve height H should be

increased by 180 (DN20-50), 240(DN65-100)

Ordering Information

When ordering, users are requested to provide the following materials

· Regulator name, model and purpose.

· Nominal diameter (mm), nominal pressure (MPa), operating temperature and range.

· Upstream pressure, downstream pressure.

· Media name and status, media flow rate.

· Bonnet type.

· Whole machine action mode (air-to-open or air-to-close), instrument air (air source pressure).

· Material requirements for valve body and valve internal parts.

· Accessory requirements:

Electro-pneumatic valve positioners, air filter decompressor, solenoid valve, holding valve, valve

position transmitters, (top-mounted) handwheels, etc.

· Valve body flange standards.

· Valve body structure length (flange surface distance L).

· Other special requirements (e.g., corrosion resistance requirements, explosion-proof level

requirements, leakage level limitation requirements, etc.).

Technical parameters are subject to change without notice!