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 SizeSize CodeABCDE*FGOrifice Diameter
1/2D0.6560.560.160.7180.530.010.0310.348
3/4F0.7800.590.160.9000.610.000.0630.464
1H1.0000.690.191.1250.780.110.0630.593
1-1/4I1.3120.810.191.5000.850.090.0630.890
1-1/2J1.6250.880.251.7811.010.150.0631.135
2K1.8750.880.252.1871.190.700.0631.385


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 MaterialAvailabilityNon-Shock Pressure-Temperature Rating
316 Stainless Steel (SS)Standard3000 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

SIZECv
1/22.4
3/44.2
16.6
1-1/411.0
1-1/217.4
232.0

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

SIZEPART NUMBERALL MATL
1/2SID0.06 oz.
3/4SIF1.0 oz.
1SIH1.7 oz.
1-1/4SII3.3 oz
1-1/2SIJ5.3 oz
2SIK8.2 oz

Valve weights are approximate.

Seat & Cracking Pressure Options

Valve StyleSize RangeBody MaterialsAllowable Seat MaterialsStandard Cracking PressuresStandard Spring Material
SI1/2" - 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
SI1/2" - 1-1/2"C. SteelAFLAS®
Buna-N
Kalrez®
"Metal to Metal"
Neoprene
PTFE
Viton®
1/8 PSI
1/2 PSI
1.5 PSI
3.5 PSI
316 SS
SI2"316SS
Brass
AFLAS®
Buna-N
EPDM
Kalrez®
"Metal to Metal"
Neoprene
PTFE
Viton®
1/8 PSI
1/2 PSI
1.5 PSI
316 SS
SI2"C. SteelAFLAS®
Buna-N
Kalrez®
"Metal to Metal"
Neoprene
PTFE
Viton®
1/8 PSI
1/2 PSI
1.5 PSI
316 SS
SI1/2" - 2"Alloy 20
Alloy C-276
AFLAS®
Buna-N
EPDM
Kalrez®
"Metal to Metal"
Neoprene
PTFE
Viton®
1/2 PSIAlloy C-276
SI1/2" - 2"Alloy 400 or MONEL®AFLAS®
Buna-N
EPDM
Kalrez®
"Metal to Metal"
Neoprene
PTFE
Viton®
1/2 PSIAlloy 400 or MONEL®
SI1/2" - 2"Alloy BAFLAS®
Buna-N
EPDM
Kalrez®
"Metal to Metal"
Neoprene
PTFE
Viton®
1/2 PSIAlloy B

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