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| Illustration 1 | g03341784 |
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(1) Line Relief Valve (bowl)
(2) Line Relief Valve (apron head end) (3) Line Relief Valve (apron rod end) | |
The line relief valve is installed in order to regulate the pressure spikes. The pressure spikes can be caused by the implement pump or any unusual outside forces acting on the work tool. When the pressure is higher than the setting of the line relief valve, the relief valve opens. This opening of the relief valve allows high pressure to return to the hydraulic tank. The line relief valves prevent high pressure from damaging any components in the hydraulic system.
Direct Operated Line Relief Valve
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| Illustration 2 | g01944870 |
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Typical example a relief valve (16) Locknut (17) Valve body (18) Passage to the hydraulic tank (19) Poppet (20) Adjustment screw (21) Spring (22) Passage to work port | |
Note: This type of line relief valve is used on the apron and bowl control valve of newer machines.
Work port oil flows into passage (22). Spring (21) holds poppet (19) in the closed position. Poppet (19) will open when oil pressure in passage (22) is greater than the force of spring (21). The oil will flow past the poppet into passage (18). The oil returns to the tank.
The relief valve pressure can be adjusted. Turn adjustment screw (20) clockwise in order to increase relief pressure. Turn adjustment screw (20) counterclockwise in order to decrease relief pressure.