Vacuum Flange Insert Check Valve Style – VI

Description

The Vacuum Flange Insert (VI) is a vacuum check valve designed to fit between ISO/NW/KF/QF vacuum flanges designed in accordance with DIN 28403, DIN 28404, ISO 1609, and ISO 2861. It is both a centering ring and a check valve. The compact design requires no additional space in the line. Its size makes it extremely economical when compared to full-bodied valves.
The VI valve can also be used as a low-pressure relief valve under either positive or vacuum conditions by using the desired spring setting.

 

NOTE: USP Class VI o-rings can be supplied with certification.

Size & Dimension

DNSize CodeDIM ADIM BDIM CDIM DOrifice Diameter
16F0.665-0.6690.310.520.620.348
25H1.020-1.0230.350.570.870.464
40J1.611-1.6140.670.821.370.890
50K2.044-2.0470.871.001.871.135


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

Available Materials

* 316 Stainless Steel (SS)

Pressure Temperature Table

Body MaterialAvailabilityNon-Shock Pressure-Temperature Rating
316 Stainless Steel (SS)StandardFULL 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.

Flow Data

PRESSURE DROP PSI

SizeCv
162.4
254.6
409.5
5020.9

 

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.

Valve Weights

DNPART NUMBERALL MATL
16VIFSS0.7 oz.
25VIHSS1.6 oz.
40VIJSS4.1 oz.
50VIKSS7.0 oz.

Valve weights are approximate.

Seat & Cracking Pressure Options

Valve StyleSize RangeBody Materials
Other Options
Allowable Seat Materials
Other Options
Standard Cracking Pressures
Other Options
More Info.
Standard Spring Material
More Info.
VI3/4" - 1-1/2"316 SSAFLAS®
EPDM
"Metal to Metal"
PTFE
Buna-N
Kalrez®
Neoprene
Viton®
1/8 PSI
1/2 PSI
1.5 PSI
3.5 PSI
316 SS
VI2"316 SSAFLAS®
Buna-N
EPDM
Kalrez®
"Metal to Metal"
Neoprene
PTFE
Viton®
1/8 PSI
1/2 PSI
1.5 PSI
316 SS

For additional information about Check Valves

What is a Silent Check Valve?
What is a Spring Loaded Check Valve?
What is a Poppet Check Valve?

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