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A21 Spring loaded low lift external thread type safety valve
  • A21 Spring loaded low lift external thread type safety valve

A21F、A21H-C Spring loaded low lift external thread type safety valves are used for air, ammonia, petroleum gas equipment and pipeline .

Details

 

 Low lift safety valve introduction:

  1.In low lift valves, the disc only lifts a distance of 1/24th of the bore diameter. The discharge area is determined entirely by the position of the disc, and since the disc only lifts a small amount, the capacities tend to be much lower than those of full or high lift valves.

 

  2. low lift safety valve valve opening height is between one twentieth to one fortieth times of the flow diameter. 

 

A21F、A21H-C type are used for the equipment and pipeline of the air, ammonia, petroleum gas, etc. medium what the working temperature are less than 200℃.

 

A21W-P,R type are used for the equipment and pipeline of the quality with corrode gas and liquid medium what the working temperature are less than 200℃ 。Take for extrapressure protection devices.


KA21Y type are used for liquefied petroleum gas what the working temperature are less than 100℃.

 

A21H/W/Y Type Spring Loaded Low Lift Safety Valve Main Parts Material

 

NO.

Parts Name

A21H-C/A21F Material

A21W-P/A21F-P Material

A21Y-R Material

1

Nipple

20

1Cr18Ni9Ti

1Cr18Ni12Mo2Ti

2

Nipple Nut

35

2Cr13

1Cr18Ni9Ti

3

Seat

35

1Cr18Ni9Ti

1Cr18Ni12Mo2Ti

4

Body

2Cr13

1Cr18Ni9Ti

1Cr18Ni12Mo2Ti

5

Disc

2Cr13/2Cr13+PTFE

1Cr18Ni9Ti/1Cr18Ni9Ti+PTFE

1Cr18Ni12Mo2Ti

6

Spring Washer

2Cr13

1Cr18Ni9Ti

1Cr18Ni12Mo2Ti

7

Spring

50CrVA

50CrVA

50CrVA

8

Locking Nut

Q235-A

ZG230-450

1Cr18Ni9Ti

9

Guide

2Cr13

1Cr18Ni9Ti

1Cr18Ni12Mo2Ti

10

Adjusting Bolt

Q235-A

2Cr13

1Cr18Ni12Mo2Ti

 

Sealing

"Y"---Stellite, "H"------D507,  "W"------Body material

 

 

A21H/W/Y Type Spring Loaded Low Lift Safety Valve Main Dimension

Model

DN

do

d

Do

M

d1

D1

L

L1

≈H

KA21-16C

A21H-16C

A21H-40

A21W-16P

A21W-40P

KA21-16P

15

12

15

20

M27×1.5

G1/2"

30

35

76

66

20

16

20

25

M33×1.5

G3/4"

35

40

87

68

25

18

25

31

M39×1.5

G1"

40

50

100

105

A21Y-64
A21Y-64P
A21Y-100
A21Y-100P

15

10

15

25

M39×1.5

G1"

44

50

100

66

20

10

20

31

M39×1.5

G1"

44

50

100

68

25

12

25

31

M39×1.5

G1"

44

50

100

105

A21W-160/160P

15

8

20

/

M24×2

G1"

44

50

100

261

20

8

25

/

M33×2

G1"

44

50

100

261

25

8

28

/

M36×2

G1"

44

50

100

285 

 A21 Spring loaded low lift external thread type safety valve

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