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Valve Style	Size Range	Body Materials	Allowable Seat Materials	Standard Cracking Pressures	Standard Spring Material
SIV	¾”-2”	TEFLON^®resin	FDA EPDM FDA VITON^® FDA Buna-N "Metal to Metal"	1/8 PSI ½ PSI 1.5 PSI 3.5 PSI	316 SS
SIV	2½”-4”	TEFLON^®resin	FDA EPDM FDA VITON^® FDA Buna-N "Metal to Metal"	1/8 PSI ½ PSI 1.5 PSI	316 SS