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 mate | |||
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 | 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 |
