Shuttle check valve PFRA series

metalstainless 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 into 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 281 PRI/Check Valve is available with or without integral safety screens in a range of 15 different relief flow cracking pressures for system pressures up to 5000 psi. - Key Product Facts - PRI/Check - Diameter: 0.281 inches - Relief Flow Lohm Rate: 220 or 1500 - Free Flow Lohm Rate: 300 or 550 Lohms - Relief Cracking Pressure Range: 625 to 6600 psid General Performance - Characteristic: Specification - Relief Flow Direction: Leakage at Minimum Cracking Pressure: 10 drops/minute maximum - Relief Flow Direction: Leakage at Minimum Shutoff Pressure: 10 drops/minute maximum - Free Flow Direction: Cracking Pressure: 5 ± 3 psid - Nominal System Pressure: up to 5000 psi - System Peak Pressure: 6750 psi maximum - Nominal Weight, Screened: 9.0 grams - Nominal Weight, Unscreened: 8.0 grams - Screen Hole Size: 0.008" Nominal Valve performance on MIL-PRF-83282 or MIL-PRF-5606 at 85°F±15°F. Materials - PART: MATERIAL: SPECIFICATION - Shuttle Plate: 303 CRES: QQ-S-763C - Seat: 440C CRES: AMS 5630 - Spring Seat: 303 CRES: QQ-S-763C - Springs: 17-7PH CRES: AMS 5678 - Body: 15-5PH CRES: AMS 5659 - Ball Follower: 303 CRES: QQ-S-763C - Tube: 17-4PH CRES or 304 CRES: AMS 5643, AMS 5639 - Ball: Tungsten Carbide - Pin: 15-5PH CRES: AMS 5659 - Screens: 15-5PH CRES: AMS 5659 Finish: All CRES Parts Passivated Pins are prewaxed. Do not degrease. Do not lubricate. Replacement Parts & Accessories - CUTA2810114C: Installation / Extraction Tool Set - SHBA2810003A: Replacement Pin Additional Technical Information - Available with or without integral safety screens - Range of 15 different relief flow cracking pressures - System pressures up to 5000 psi Performance in Relief Flow Direction Characteristics / Technical Specifications - Diameter: 0.281 inches - Relief Flow Lohm Rate: 220 or 1500 - Free Flow Lohm Rate: 300 or 550 Lohms - Relief Cracking Pressure Range: 625 to 6600 psid - Nominal System Pressure: up to 5000 psi - System Peak Pressure: 6750 psi maximum - Nominal Weight, Screened: 9.0 grams - Nominal Weight, Unscreened: 8.0 grams - Screen Hole Size: 0.008" Nominal - Materials: 303 CRES, 440C CRES, 17-7PH CRES, 15-5PH CRES, 17-4PH CRES, 304 CRES, Tungsten Carbide