Product Overview: 



 A21F, A21H-C is suitable for operating temperature ≤ 200 ℃ in air, ammonia, liquefied petroleum gas ... ... and other media equipment or pipeline. A21W-P, R-type temperature ≤ 200 ℃ for corrosive gas or liquid pipeline facilities or, as the overpressure protection device. KA21Y is suitable for temperature ≤ 100 ℃ liquefied petroleum gas. 

 Second, the main parts material: 



 NO. Part Name A21H-C/A21F material A21W-P/A21F-P material A21Y-R materials 
 A connector 20 1Cr18Ni9Ti 1Cr18Ni12Mo2Ti 
 2 union nuts 35 2Cr13 1Cr18Ni9Ti 
 3 seat 35 1Cr18Ni9Ti 1Cr18Ni12Mo2Ti 
 4 Body 2Cr13 1Cr18Ni9Ti 1Cr18Ni12Mo2Ti 
 5 disc 2Cr13/2Cr13 + PTFE 1Cr18Ni9Ti/1Cr18Ni9Ti + PTFE 1Cr18Ni12Mo2Ti 
 6 spring seat 2Cr13 1Cr18Ni9Ti 1Cr18Ni12Mo2Ti 
 7 Spring 50CrVA 50CrVA fluoride coated plastic coated fluoroplastic 50CrVA 
 8 nuts, Q235-A ZG230-450 1Cr18Ni9Ti 
 9 spring guide pad 2Cr13 1Cr18Ni9Ti 1Cr18Ni12Mo2Ti 
 10 adjusting nut Q235-A 2Cr13 1Cr18Ni12Mo2Ti 
 Sealing surface material "Y"-type Co-based cemented carbide surfacing, "H" type surfacing D507, "W"-type of the valve body 



 Third, the standard Japanese brand A21F, A21H inching male valve spring dimensions and connecting dimensions: 



 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 
 A21Y-64P 
 A21Y-100 
 A21Y-100P 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 





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