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Type A21H Low Lift Safety Valve

low lift, metal to metal seated/soft sealthreaded connection end

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Type A21H, KA21 Pressure Reilef  Valve


safety valve/pressure relief valve, angle type

low lift, metal to metal seated/soft seal

threaded connection end


Applications

Provided as safety device for protection against excessive pressure in pressure vessels.

 Approved for gases and fluids.

Working temperatures: A21F, A21H-C, A21W-P,R ≤ 200℃; KA21Y ≤ 100℃


Standards Compliance

Design and Manufacture: GB/T 12241-2005, GB/T 12243-2005 

Face to Face(end to end): JB/T 2203-1999 

Test and Inspection: GB/T 12243-2005



Material for main parts  

NO

Name of part

A21H-C/A21F,KA21Y-C Material

A21W-P/A21F-P /KA21Y-P Material

A21Y-R Materials

1

Union

20

304

316

2

Union nut

35

2Cr13

304

3

Nozzle

35

304

316

4

Body

2Cr13

304

316

5

Disc

2Cr13/PTFE

304/PTFE

316

6

Spring Washer

2Cr13

304

316

7

Spring

50CrVA

50CrVA coated teflon

50CrVA coated teflon

8

Locking Nut

Q235-A

2Cr13

304

9

Spring guide

2Cr13

304

316

10

Adjust nut

Q235-A

2Cr13

316

Sealing surface of material "H" depositing D507, "W" same as body, "Y" depositing stellite, "F" PTFE soft seal

 

Essential:
Valves are delivered at a set pressure, therefore when ordering 
please confirm set pressure, medium and temperature


TS

Safety accessory and Safety protection device 
Manufacture License of Special Equipment, People's republic of China


Dimensions(mm)  

Type

DN

do

d

D0

M

d1

D1

L

L1

≈H

KA21Y-16C, 
A21H-16C,A21H-40,
A21W-16P, A21W-40P,
KA21Y-16P

15

12

15

20

M27x1.5

G1/2"

30

35

76

66

20

16

20

25

M33x1.5

G3/4"

34

40

87

68

25

18

25

31

M39x1.5

G1"

40

50

100

105

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

15

10

15

25

M39x1.5

G1"

44

50

100

66

20

10

20

31

M39x1.5

G1"

44

50

100

68

25

12

25

31

M39x1.5

G1"

44

50

100

105

A21W-160
A21W-160P

15

8

20

/

M24x2

G1"

44

50

100

261

20

8

25

/

M33x2

G1"

44

50

100

261

25

8

28

/

M36x2

G1"

44

50

100

285

Remark: NPT, R, G thread are accepted






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