llolDl i llExampes Appcationsf liControl Vavesirectil on-ControVavesKDSeriesESeriesMSeriesLarge-SzeModuar VavesliHydraucVavescat-No.78E since2017Examples of Valve Applications Shown in Circuit DiagramsPressure maintaining circuit The cylinder overruns because the motor does not stop immediately after the motor power supply is turned off. Pressure maintaining circuit(overrun prevention circuit)Prevents cylinder overrun (overshoot) by reducing the differential pressure between the pressure switch and the relief valve. Pressure control circuit (feedback pressure control/ecological feedback pressure circuit)Maintains the line pressure continuously and constantly with high accuracy by using an inverter motor and a proportional pressure reducing valve together without an oil cooler. Pressure maintaining circuit Maintains pressure of the cylinder push side using a pilot controlled check valve.Controls the maximum pressure using a relief valve. If the temperature exceeds the operating temperature range depending on the operating conditions, use an oil cooler. If a large cylinder is used, a shock occurs when the direction-control valve switches to another position. To prevent this, the circuit reduces pressure using a 2-way valve before switching. Pressure control circuit Pressure reducing circuitPressure maintaining circuit (overrun prevention circuit)Prevents cylinder overrun using two sole-noid valves. Pressure control circuit (feedback pressure control circuit) Can adjust the pressure accurately and remotely using a proportional solenoid relief valve. Follows a fast movement of the cylin-der properly and can obtain stable pressure even if there is a change in oil temperature. Falling-by-self-weight prevention circuit If a heavy load is attached to the cylin-der piston, the piston may fall faster than the speed corresponding to the pump’s discharge volume. The circuit adjusts the preset pressure for the counterbalance valve so that the pressure is appropriate for the heavy load to prevent the cylinder piston from falling by self-weight. 104
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