Marine External Thread Spring Low Lift Safety Valve A21H / A21Y
- Series A21F, A21H-C is suitable for air, oil gas such medium or pipeline with working temperature ≤200℃
- Series A21W-P, R Type is suitable for corrosive gas or liquid equipment or pipeline with working temperature ≤200℃
- Nominal Size: DN15-DN25.
Material
| Name of Part | A21H-C/A21F KA21Y-C Materials | A21W-P/A21F-P KA21Y-P Materials | A21Y-R Materials |
| Union | 20 | 1Cr18Ni9Ti | 1Cr18Ni12Mo2Ti |
| Union nut | 35 | 2Cr13 | 1Cr18Ni9Ti |
| Nozzle | 35 | 1Cr18Ni9Ti | 1Cr18Ni12Mo2Ti |
| Body | 2Cr13 | 1Cr18Ni9Ti | 1Cr18Ni12Mo2Ti |
| Disc | 2Cr13/2Cr13+PTFE | 1Cr18Ni9Ti/1Cr18nI9Ti+PTFE | 1Cr18Ni12Mo2Ti |
| Spring washer | 2Cr13 | 1Cr18Ni9Ti | 1Cr18Ni12Mo2Ti |
| Spring | 50CrVA | 50CrVA Coated Teflon | 50CrVA Coated Teflon |
| Locking nut | Q235-A | 2Cr13 | 1Cr18Ni9Ti |
| Spring guide | 2Cr13 | 1Cr18Ni9Ti | 1Cr18Ni12Mo2Ti |
| Adjusting nut | Q235-A | 2Cr13 | 1Cr18Ni12Mo2Ti |
| Type | Nominal diameter mm |
Do mm |
M mm |
d1 mm |
D1 mm |
L mm |
L1 mm |
| KA21Y-16C A21H-16C A21H-40 A21W-16P A21W-40P KA21Y-16P |
15 20 25 |
20 25 31 |
M27 1.5 M33 1.5 M39 1.5 |
G1/2″ G3/4″ G1″ |
30 34 40 |
35 40 50 |
76 87 100 |
| A21Y-64 A21Y-64P A21Y-100 A21Y-100P |
15 20 25 |
25 31 31 |
M39 1.5 M39 1.5 M39 1.5 |
G1″ G1″ G1″ |
40 44 44 |
50 50 50 |
100 100 100 |
| A21W-160 /160P |
15 20 25 |
/ / / |
M24 2 M33 2 M36 2 |
G1″ G1″ G1″ |
44 44 44 |
50 50 50 |
100 100 100 |