Thermal pressure relief valve PRTA series

direct-operated

This direct-acting valve has been optimized to relieve small flows caused by thermal expansion of a trapped volume of fluid. Minimum cracking pressures are available from 3500-4500 psid. This valve includes a 15 micron filter. - Thermal Relief Valve - Diameter: 0.187 inches - Full Open Lohm Rate: 325,000 Lohms max - Nominal System Pressure: Up to 4000 psi - Cracking Pressure Range: 3500 to 4700 psi General Performance - Leakage at Minimum Cracking Pressure: 4 Drops / Minute Maximum - Leakage at Shutoff: 40 Drops / Hour Maximum (after a 2 minute wait) - Integral Filtration: 15 micron Nominal - Nominal System Pressure: up to 4000 psi - System Peak Pressure: 5400 psi Maximum - Nominal Weight: 2.6 grams - Test Fluid: MIL-PRF-83282 at 85°F Materials - Body: 304 CRES (AMS 5639) - Pin: 17-4PH CRES (AMS 5643) - Spring Seat: 304 CRES (AMS 5639) - Spring: 17-7PH CRES (AMS 5678) - Ball Follower: 17-4PH CRES (AMS 5643) - Ball: CERAMIC - Seat: CERAMIC - Orifice: 17-4PH CRES (AMS 5643) - Filter: 316 CRES (15 µm Nominal) Finish: All CRES parts passivated. Pins are prewaxed. Do not degrease. Do not lubricate. Part Numbers & Specifications - PRTA1871350D: Minimum Cracking Pressure 3500 psid, Flow Point Lohm Rate 325,000, Minimum Flow 15 mL/minute at 4050 psid, Minimum Shut-off Pressure 3200 psid - PRTA1871470D: Minimum Cracking Pressure 4700 psid, Flow Point Lohm Rate 325,000, Minimum Flow 17 mL/minute at 5300 psid, Minimum Shut-off Pressure 4200 psid Performance on MIL-PRF-83282 at 85°F Replacement Parts & Accessories: - CUTA1870104C: Installation / Extraction Tool Set - JEVA1870003B: Replacement Pin Flow Curve, Cross Section View, Dimensional View, and Installation Hole Details available as images (see images section). For more information, refer to the Technical Hydraulic Handbook of Aerospace, Energy, and Motorsport Solutions (see documents section). Key Technical Specifications - Valve Type: Direct-acting thermal pressure relief valve - Diameter: 0.187 inches - Cracking Pressure Range: 3500 to 4700 psi - Full Open Lohm Rate: 325,000 Lohms max - Nominal System Pressure: Up to 4000 psi - System Peak Pressure: 5400 psi Maximum - Integral Filtration: 15 micron Nominal - Nominal Weight: 2.6 grams - Materials: 304 CRES, 17-4PH CRES, 17-7PH CRES, 316 CRES, Ceramic