A21F/H/W-16C/16P,A21Y-16R Spring Micro opening External Thread Safety ValveDetailed product description：

A21F and A21H-C are suitable for equipment or pipelines with working temperatures ≤ 200 ℃ for media such as air, ammonia, petroleum gas, etc. A21W-P and R types are suitable for use as overpressure protection devices on equipment or pipelines with corrosive gases or liquids at temperatures ≤ 200 ℃. KA21Y type is suitable for liquefied petroleum gas with a temperature ≤ 100 ℃.

Main component materials:

NO.	Part Name	A21H-C/A21F material	A21W-P/A21F-P material	A21Y-R material
one	Pipe joint	twenty	1Cr18Ni9Ti	1Cr18Ni12Mo2Ti
two	Pipe joint nut	thirty-five	2Cr13	1Cr18Ni9Ti
three	valve seat	thirty-five	1Cr18Ni9Ti	1Cr18Ni12Mo2Ti
four	valve body	2Cr13	1Cr18Ni9Ti	1Cr18Ni12Mo2Ti
five	valve disc	2Cr13/2Cr13+PTFE	1Cr18Ni9Ti/1Cr18Ni9Ti+PTFE	1Cr18Ni12Mo2Ti
six	spring seat	2Cr13	1Cr18Ni9Ti	1Cr18Ni12Mo2Ti
seven	spring	50CrVA	50CrVA coated fluoroplastic	50CrVA coated fluoroplastic
eight	lock nut	Q235-A	ZG230-450	1Cr18Ni9Ti
nine	Spring guided pad	2Cr13	1Cr18Ni9Ti	1Cr18Ni12Mo2Ti
ten	adjusting nut	Q235-A	2Cr13	1Cr18Ni12Mo2Ti
	Sealing surface material	Y-type cladding Co based hard alloy, H-type cladding D507, W-type for valve body

A21F/H/W-16C/16P, A21Y-16R spring micro opening external thread safety valve external dimensions and connection dimensions:

Model	Nominal Diameter	do	d	Do	M	d1	D1	L	L1	≈H
KA21-16C A21H-16C A21H-40 A21W-16P A21W-40P KA21-16P	fifteen	twelve	fifteen	twenty	M27×1.5	G1/2"	thirty	thirty-five	seventy-six	sixty-six
	twenty	sixteen	twenty	twenty-five	M33×1.5	G3/4"	thirty-five	forty	eighty-seven	sixty-eight
	twenty-five	eighteen	twenty-five	thirty-one	M39×1.5	G1"	forty	fifty	one hundred	one hundred and five
A21Y-64 A21Y-64P A21Y-100 A21Y-100P	fifteen	ten	fifteen	twenty-five	M39×1.5	G1"	forty-four	fifty	one hundred	sixty-six
	twenty	ten	twenty	thirty-one	M39×1.5	G1"	forty-four	fifty	one hundred	sixty-eight
	twenty-five	twelve	twenty-five	thirty-one	M39×1.5	G1"	forty-four	fifty	one hundred	one hundred and five
A21W-160/160P	fifteen	eight	twenty	/	M24×2	G1"	forty-four	fifty	one hundred	two hundred and sixty-one
	twenty	eight	twenty-five	/	M33×2	G1"	forty-four	fifty	one hundred	two hundred and sixty-one
	twenty-five	eight	twenty-eight	/	M36×2	G1"	forty-four	fifty	one hundred	two hundred and eighty-five

A21F/H/W-16C/16P, A21Y-16R Spring Micro opening External Thread Safety Valve