VI

DN	Size Code	DIM A	DIM B	DIM C	DIM D	Orifice Diameter
16	F	0.665-0.669	0.31	0.52	0.62	0.348
25	H	1.020-1.023	0.35	0.57	0.87	0.464
40	J	1.611-1.614	0.67	0.82	1.37	0.890
50	K	2.044-2.047	0.87	1.00	1.87	1.135

NOTES (DIMENSIONS TABLE)*Maximum nominal dimension for a fully open valve with no spring. Consult factory for more information.

* 316 Stainless Steel (SS)

Body Material	Availability	Non-Shock Pressure-Temperature Rating
316 Stainless Steel (SS)	Standard	FULL VACUUM-ATMOSPHERIC @ 100° F

Seat material and spring material selection may limit the recommended service temperature.
See seat ratings, spring ratings, and body material ratings for their respective recommended service temperatures.
Consult the factory for reduced P-T rating above 100 °F. Standard spring material is 316 Stainless Steel.

PRESSURE DROP PSI

Size	Cv
16	2.4
25	4.6
40	9.5
50	20.9

 

FOR WATER AT 72°F

WATER FLOWRATE - GPM

Note: All flow curves and Cv values presume the valves are fully open with 1/2 PSI cracking pressure springs. Consult the factory for more information.

DN	PART NUMBER	ALL MATL
16	VIFSS	0.7 oz.
25	VIHSS	1.6 oz.
40	VIJSS	4.1 oz.
50	VIKSS	7.0 oz.

Valve weights are approximate.

Valve Style	Size Range	Body Materials Other Options	Allowable Seat Materials Other Options	Standard Cracking Pressures Other Options More Info.	Standard Spring Material More Info.
VI	3/4" - 1-1/2"	316 SS	AFLAS® EPDM "Metal to Metal" PTFE Buna-N Kalrez® Neoprene Viton®	1/8 PSI 1/2 PSI 1.5 PSI 3.5 PSI	316 SS
VI	2"	316 SS	AFLAS® Buna-N EPDM Kalrez® "Metal to Metal" Neoprene PTFE Viton®	1/8 PSI 1/2 PSI 1.5 PSI	316 SS