LOW NOISE PILOT OPERATED RELIEF VALVE FEATURES • HRF series relief valve is designed on the theory of differential pressure created by flow across the orifice of the balance piston. This differential pressure acts to open the piston against the spring, permitting enough fluid vented to tank at the set pressure. • Piston moves smoothly, and controlled by pilot pressure, provides stable pressure control and good repeatability. • Special internal passage design keeps flow noise to a minimum.       Quick Links Model Code Specifications Dimensions     Model Code - top   Symbols - top Specifications - top MODEL MAX. PRESSURE MAX. FLOW MOUNTING BOLTS BAR (PSI) LPM (GPM) METER (INCH) HRF-G03-*-* 242 (3500) 100 (26.4 ) M12x40Lx4(1/2"x1-3/5") HRF-G06-*-* 200 ( 52.8 ) M16x50Lx4(5/8"x2") HRF-G10-*-* 400 (105.6) M20x60Lx4(3/4"x2-2/5") PERFORMANCE CURVES - top TEST CONDITIONS Viscosity: 35 cSt (175 SSU) Temperature: 50° C (122° F)   Dimensions - top UNIT: mm(inch) HRF-G03/G06/G10-R HRF-G03/G06/G10-L MODEL A B C D E F G H J HRF-G03 76(3) 53.8(2.12) 11.1(0.44) 26.9(1.06) 53.8(2.11) 113.5(4.47) 27(1.06) 171(6.73) 13.5(0.53) HRF-G06 104(4.09) 70(2.76) 17(0.67) 35(1.38) 66.7(2.63) 98.8(3.89) 33.7(1.33) 171(6.73) 17.5(0.69) HRF-G10 120(4.72) 82.6(3.25) 18.7(0.74) 41.3(1.63) 88.9(3.5) 89(3.35) 44.9(1.77) 219(8.62) 21.5(0.85) MODEL K L N P Q S T SUBPLATE TYPE                 HRF-G03 21(0.83) 51(2.01) 132(5.2) 104(4.09) 22(0.86) 106(4.17) 26(1.02) MF-04 HRF-G06 25(0.98) 51(2.01) 132(5.2) 104(4.09) 27(1.06) 123(4.84) 36.5(1.44) MF-06 HRF-G10 32(1.26) 65(2.56) 167(6.52) 135(5.32) 33.5(1.32) 155(6.1) 47(1.85) MF-10