Straight-Sided Insert Check Valve Style – SI

Description

The Straight Sided Insert (SI) is a thread less check valve designed to be inserted into any cavity where a check valve is needed and threads are not desired. The SI valve can be used as a low pressure relief valve or vacuum breaker by using the desired spring settings.

PED Compliance Statement: Due to the unique “insert” design of our 3S, SC, CB, TC, SI, & UV, style check valves, they do not constitute an “identifiable pressure bearing housing” as defined in PED Guideline 1/8. These styles must be installed into either ferrules or fittings to create a pressure bearing housing. Instead, they are classified as “components of pressure equipment” as defined in PED Guideline 1/8. As a result, these valves can be sold in the European Community and no CE Mark is required.

In addition applicaitons where the maximum allowed oerating pressure is 0.5 bar (7.2 psi) or less, do not fall under the PED, regardless of the valve style.

Size & Dimension
Nominal Pipe Size Size Code A B C D E* F G Orifice Diameter
1/2 D 0.656 0.56 0.16 0.718 0.53 0.01 0.031 0.348
3/4 F 0.780 0.59 0.16 0.900 0.61 0.00 0.063 0.464
1 H 1.000 0.69 0.19 1.125 0.78 0.11 0.063 0.593
1-1/4 I 1.312 0.81 0.19 1.500 0.85 0.09 0.063 0.890
1-1/2 J 1.625 0.88 0.25 1.781 1.01 0.15 0.063 1.135
2 K 1.875 0.88 0.25 2.187 1.19 0.70 0.063 1.385


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) * Alloy B (HB)
* Alloy 20 (A2) * Alloy C-276 (HC)
* Brass (BR) * Alloy 400 or MONEL® (MO)
* Carbon Steel (CS) * Titanium (TI)

Pressure Temperature Table
Body Material Availability Non-Shock Pressure-Temperature Rating
316 Stainless Steel (SS) Standard 3000 PSIG @ 100 °F
(1500 PSIG for o-ring seats)
Carbon Steel (CS)
Brass (BR)
Alloy 20 (A2) Semi-standard
Alloy C-276 (HC)
Alloy 400 or MONEL® (MO)
Alloy B (HB) Contact the factory for of these or other materials.
Titanium (TI)


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

SIZE Cv
1/2 2.4
3/4 4.2
1 6.6
1-1/4 11.0
1-1/2 17.4
2 32.0

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 Weigths
SIZE PART NUMBER ALL MATL
1/2 SID 0.06 oz.
3/4 SIF 1.0 oz.
1 SIH 1.7 oz.
1-1/4 SII 3.3 oz
1-1/2 SIJ 5.3 oz
2 SIK 8.2 oz


Valve weights are approximate.

Seat & Cracking Pressure Options
Valve Style Size Range Body Materials Allowable Seat Materials Standard Cracking Pressures Standard Spring Material
SI 1/2" - 1-1/2" 316 SS
Brass
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
SI 1/2" - 1-1/2" C. Steel AFLAS®
Buna-N
Kalrez®
"Metal to Metal"
Neoprene
PTFE
Viton®
1/8 PSI
1/2 PSI
1.5 PSI
3.5 PSI
316 SS
SI 2" 316SS
Brass
AFLAS®
Buna-N
EPDM
Kalrez®
"Metal to Metal"
Neoprene
PTFE
Viton®
1/8 PSI
1/2 PSI
1.5 PSI
316 SS
SI 2" C. Steel AFLAS®
Buna-N
Kalrez®
"Metal to Metal"
Neoprene
PTFE
Viton®
1/8 PSI
1/2 PSI
1.5 PSI
316 SS
SI 1/2" - 2" Alloy 20
Alloy C-276
AFLAS®
Buna-N
EPDM
Kalrez®
"Metal to Metal"
Neoprene
PTFE
Viton®
1/2 PSI Alloy C-276
SI 1/2" - 2" Alloy 400 or MONEL® AFLAS®
Buna-N
EPDM
Kalrez®
"Metal to Metal"
Neoprene
PTFE
Viton®
1/2 PSI Alloy 400 or MONEL®
SI 1/2" - 2" Alloy B AFLAS®
Buna-N
EPDM
Kalrez®
"Metal to Metal"
Neoprene
PTFE
Viton®
1/2 PSI Alloy B