Universal High Pressure Style - U1, R1

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Universal High Pressure Style - U1, R1

The Universal High Pressure (U1, R1) check valve is a one piece body machined from bar stock with female pipe threads. This valve is normally supplied with a "metal-to-metal" seat. NPT threads are per ASME B1.20.1 and also available with ISO 7 "Rp" threads. (R1). The valve is designed and manufactured for high pressure applications.  For applications below 3000 PSIG, view our UN-3 series. Many valves in this series can be supplied with B16.34 certification. Consult the factory for more information.

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NOTES (DIMENSIONS TABLE)
*May be larger and/or round.
**Consult factory for ISO 7 "Rp" threads.

View U1 Dimensions in PDF format

Nominal Size Size Code A HEX SIZE B C** Orifice Diameter
3/8 C 2.16 1 3/8 NPT 0.348
1/2 D 2.71 1-1/4 1/2 NPT 0.464
3/4 F 2.95 1-5/8 3/4 NPT 0.593
1 H 3.64 2-1/4 1 NPT 0.890
1-1/4 I 3.91 2-3/4 1-1/4 NPT 1.135
1-1/2 J 4.36 3-1/4 1-1/2 NPT 1.385
  • 316 Stainless Steel (SS)
  • Alloy C-276 (HC)
  • Alloy 20 (A2)
  • Alloy 400 or MONEL® (MO)
  • Carbon Steel (CS)
  • Titanium (TI)
  • Alloy B (HB)
  • Body Material Availability Non-Shock Pressure-Temperature Rating
    316 Stainless Steel (SS)
    Carbon Steel (CS)
    Alloy 20 (A2)
    Alloy C-276 (HC)
    Alloy 400 or MONEL®(MO)
    Alloy B (HB)
    Titanium (TI)
    Standard 10,000 PSIG @ 100°F

    Semi-standard

    Contact the factory for these or other materials

    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
    3/8 1.9
    1/2 3.5
    3/4 7.2
    1 14.6
    1-1/4 28.8
    1-1/2 31.9

    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 SS, CS & Alloys
    3/8 U1C 5.9 oz.
    1/2 U1D 11.8 oz.
    3/4 U1F 1.4 lb.
    1 U1H 3.5 lb.
    1-1/4 U1I 5.4 lb.
    1-1/2 U1J 8.1 lb.
    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.
    U1 3/8" - 1-1/4" 316 SS
    "Metal to Metal" 1/8 PSI
    1/2 PSI
    1.5 PSI
    3.5 PSI
    316 SS
    U1 1-1/2" 316 SS "Metal to Metal" 1/8 PSI
    1/2 PSI
    1.5 PSI
    316 SS
    U1 3/8" -1-1/2" Alloy 20
    Alloy C-276
    "Metal to Metal" 1/2 PSI Alloy C-276
    U1 3/8" -1-1/2" Alloy 400 or MONEL® "Metal to Metal" 1/2 PSI Alloy 400 or MONEL®
    U1 3/8" -1-1/2" Alloy B "Metal to Metal" 1/2 PSI Alloy B

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