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.
|Nominal Pipe Size||Size Code||A||HEX SIZE B||C**||Orifice Diameter|
NOTES (DIMENSIONS TABLE)*May be larger and/or round.
**Consult factory for ISO 7 "Rp" threads.
- 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)
|Standard||10,000 PSIG @ 100°F|
|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.
PRESSURE DROP PSI
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|
Valve weights are approximate.