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
