Shuttle check valve PFRA series

stainless steel

This valve combines the function of a reverse flow pressure relief valve in parallel with that of a check valve with free flow in the forward direction — all in one easy-to-install insert. The relief valve function features a rugged tungsten carbide ball and a 440C seat for durability and long life. The remaining components are constructed entirely of stainless steel. The 375 PRI/Check Valve is available in a range of seven different relief flow cracking pressures for system pressures up to 5000 psi. - PRI/Check - Diameter: 0.375 inches - Relief Flow Lohm Rate: 400 Lohms max. - Free Flow Lohm Rate: 220 Lohms max. - Relief Cracking Pressure Range: 3000 to 5400 psid General Performance - Relief Flow Direction: Leakage at Minimum Cracking Pressure: 2 mL/minute maximum - Relief Flow Direction: Leakage at Minimum Shutoff Pressure: 2 mL/minute maximum - Relief Flow Direction: Restriction at Min. Recommended Valve Lift: 1500 Lohms - Relief Flow Direction: Flow Point Lohm Rate: 400 Lohms - Free Flow Direction: Cracking Pressure: 5 ± 3 psid - Free Flow Direction: Lohm Rate at 25 psid and Greater: 220 Lohms maximum - Nominal System Pressure: up to 5000 psi - System Peak Pressure: 6750 psi maximum - Nominal Weight: 24 grams Valve performance on MIL-PRF-83282 or MIL-PRF-5606 at 85°F±15°F. Materials - Shuttle Plate: 304 CRES, AMS 5639 - Seat: 440C CRES, AMS 5630 - Spring Seat: 15-5PH CRES, AMS 5659 - Springs: 17-7PH CRES, AMS 5678 - Retainer: 15-5PH CRES, AMS 5659 - Shim: 17-7PH CRES, AMS 5529 - Body: 304 CRES, AMS 5639 - Ball Follower: 304 CRES, AMS 5639 - Tube: 13-8 MO CRES, AMS 5629 - Ball: Tungsten Carbide - Orifice Plate: 304 CRES, AMS 5639 - Pin: 17-4PH CRES, AMS 5643 Finish: All CRES Parts Passivated Pins are prewaxed. Do not degrease. Do not lubricate. Part Numbers & Specifications - PFRA3750300D: Minimum Cracking Pressure: 3000 psid, Flow Point - Maximum Lohm Rate: 400, Flow Point - Minimum Flow: 3.7 gpm, Flow Point - Pressure Differential: 3850 psid, Minimum Shutoff Pressure: 2850 psid - PFRA3750320D: Minimum Cracking Pressure: 3200 psid, Flow Point - Maximum Lohm Rate: 400, Flow Point - Minimum Flow: 3.8 gpm, Flow Point - Pressure Differential: 4050 psid, Minimum Shutoff Pressure: 3000 psid - PFRA3750340D: Minimum Cracking Pressure: 3400 psid, Flow Point - Maximum Lohm Rate: 400, Flow Point - Minimum Flow: 3.9 gpm, Flow Point - Pressure Differential: 4250 psid, Minimum Shutoff Pressure: 3200 psid - PFRA3750420D: Minimum Cracking Pressure: 4200 psid, Flow Point - Maximum Lohm Rate: 400, Flow Point - Minimum Flow: 4.0 gpm, Flow Point - Pressure Differential: 5250 psid, Minimum Shutoff Pressure: 4000 psid - PFRA3750440D: Minimum Cracking Pressure: 4400 psid, Flow Point - Maximum Lohm Rate: 400, Flow Point - Minimum Flow: 4.1 gpm, Flow Point - Pressure Differential: 5400 psid, Minimum Shutoff Pressure: 4200 psid - PFRA3750520D: Minimum Cracking Pressure: 5200 psid, Flow Point - Maximum Lohm Rate: 400, Flow Point - Minimum Flow: 4.9 gpm, Flow Point - Pressure Differential: 6550 psid, Minimum Shutoff Pressure: 5000 psid - PFRA3750540D: Minimum Cracking Pressure: 5400 psid, Flow Point - Maximum Lohm Rate: 400, Flow Point - Minimum Flow: 5.0 gpm, Flow Point - Pressure Differential: 6750 psid, Minimum Shutoff Pressure: 5200 psid Performance in Relief Flow Direction Replacement Parts & Accessories - CUTA3750514C: Installation / Extraction Tool Set - PHRA3750003A: Replacement Pin Flow Curve, Cross Section View, Dimensional View, and Installation Hole Details available as images (see images section). Key Technical Specifications - Diameter: 0.375 inches - Relief Flow Lohm Rate: 400 Lohms max. - Free Flow Lohm Rate: 220 Lohms max. - Relief Cracking Pressure Range: 3000 to 5400 psid - Nominal System Pressure: up to 5000 psi - System Peak Pressure: 6750 psi max. - Nominal Weight: 24 grams - Materials: Stainless steel (various grades), Tungsten Carbide