Pressure Relief Valve MXF NPT Excel Metal part no. X W L Size PRV-6K-4NMX4NF SQ.32(1.26") 45(1. 77") 128(5.04) 1/4" PRV-6K-8NMX8NF SQ32(1.26") 50(1.99") 133(5.24") 1/2" PRV-6K-12NMX12NF SQ.32(1.26") 50(1.99") 133(5.24") 3/4" Instruction for Setting Pressure : Rotate the locknut-2 (part # 4) in clockwise direction & let it come down till available thread. Now tighten the cap (part # 3) in clockwise direction till the discharge at the outlet stops. Rotate the locknut-2 (part # 4) in anticlockwise direction & hold the cap in another spanner & tighten the locknut Features : Oprating Temperature : 10°c to 25° c Orifice size : 6mm 100% valve are factory tested prior to despatch. Pressure can be set as per requirement.