<p>Pressure relief valve for domestic combination or system boilers. Also known as safety relief valve, blow off valve, release valve, PRV and SRV.</p> <p>Manufactured by Caleffi, the 514 series relief valves are identifiable by a red cap, normally marked with the pressure rating, on top of a black spindle (or valve head). To activate the valve, the red cap is twisted, pulling the EPDM diaphragm away from the valve seat, and thereby providing a route of escape for the pressurised water.</p> <p>Technical specification:</p> <ul> <li>Inlet connection:&nbsp; 1/2in BSP Male</li> <li>Outlet connection: 1/2in BSP Female</li> <li>Pressure rating: 3bar</li> <li>Brass body to EN 12165 CW617N</li> <li>EPDM Diaphragm</li> <li>Caleffi product code: 514430</li> <li>Alias product codes: 514430CST, CA-514430, CA514430</li> </ul> <p>This specific relief valve has previously been fitted to Ravenheat, Ferroli and Ocean Alpha boilers, under the following manufacturers part numbers:</p> <ul> <li>Ferroli 800130</li> <li>Ravenheat 5015010&nbsp;&nbsp;&nbsp;</li> <li>Ocean Alpha 5619620 and 6.5619620&nbsp;&nbsp;</li> <li>British Gas Council numbers 372897, 372-897, 386816 and 386-816</li> </ul>