Patent ID: 8800426

Claim:
A hydraulic load control valve device, comprising: a first engine connecting port (L′) and a second engine connecting port (N′) that are arranged to be connected to a first engine port (L) and a second engine port (N), respectively, on a double acting hydraulic cylinder (D); a first valve connecting port (M′) and a second valve connecting port (O′), which are arranged to be connected to separate operational ports (M and O, respectively) on a hand valve (H); a normally closed proportional load control valve (E), which has an inlet connected to the first engine connecting port (L′) and an outlet connected to the first valve connecting port (M′) and a control inlet that is hydraulically connected to the second valve connecting port (O′), said load control valve (E) arranged to vary between a closed position and a fully opened position as a pressure on the control inlet varies over a predetermined pressure interval; and a first check valve ( 12 ), an outlet side of said first check valve ( 12 ) connected to the second engine connecting port (N′) and an inlet side of said first check valve ( 12 ) connected to the second valve connecting port (O′), said first check valve ( 12 ) being pre-stressed or pre-stressable to open only when a pressure on the inlet side is higher than the predetermined pressure interval.