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Type A21, KA21 Safety Valve

 

Safety Valves, angle type

 

Low lift safety valve

Metal to metal seated/soft seal

Connection end acc. to NPT/PT/G thread

 

Applications:

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

"Approved for  gases, vapours 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

 

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, PT, G thread are accepted

 

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

A21H

Versatile for Gas, Oil and Water