System preventing pressured oil leakage to cylinder line in control valve systems with flow divider

A system for preventing pressured oil leakage in a cylinder line (24) that is connected to a hydraulic cylinder (26), the system comprising:

• a housing comprising a control valve having three positions that are a raising position, a lowering position and a neutral position, the control valve including a main spool (2) defining the raising, the lowering and the neutral positions of the control valve, the control valve controlling movement of the hydraulic cylinder (26), said housing (1) further including a flow divider spool (4) and a flow divider dynamic pressure volume (27) acting against one end of the flow divider spool (4), the flow divider spool being connected to an oil inlet duct (13), an excess flow line (14) and to the control valve through a flow divider and main spool link (15);
• said housing further comprising a check valve (10);
• said housing further comprising a main spool and check valve link (16) connecting an output port of the control valve to the check valve (10);
• the housing (1) further including a flow divider pilot spool (12) preventing the system from being exposed to pressure during shifting from the raising position to the neutral position;
• a check valve and flow divider pilot spool link (17) enabling the pressured oil which runs into the main spool and check valve link (16) during the raising process to arrive into the flow divider pilot spool (12);
• a flow divider and main spool inlet link (19) connecting the oil in the inlet of the main spool (2) to an end of the flow divider pilot spool (12);
• a flow divider pilot spool link (20) opening the flow divider pilot spool to connect the flow divider pilot spool and flow divider spring side link (29) to a flow divider pilot spool and tank link which connects to an oil tank (28);
• the main spool (2) further comprising a main spool transfer link (22) connecting a main spool transfer line to the flow divider and main spool inlet link (19) according to the position of the main spool (2), wherein the housing further comprises discharge notches (32) for leak oil acting together with the flow divider pilot spool (12), the discharge notches enabling the oil leaking from the control valve to be discharged to the oil tank (28) through the main spool and check valve link (16) and the flow divider pilot spool and tank link (20) when the excess flow line (14) is pressurized.