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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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316 Stainless Steel (SS) Alloy C-276 (HC) Alloy 20 (A2) Alloy 400 or MONEL® (MO) Carbon Steel (CS) Titanium (TI) Alloy B (HB)
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.
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P D P |
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 are approximate.
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 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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