Straight-Sided Insert Style - SI

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Straight-Sided Insert Style - SI

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

View SI Dimensions in PDF format

Nominal 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
  • 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)
  • 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.

    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

    P
    R
    E
    S
    S
    U
    R
    E

    D
    R
    O
    P

    P
    S
    I

    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.

    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.
    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.
    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

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