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• When the solenoid control valve closes (solenoid coil is energized), a difference in pressure is created and the pressure in the crank chamber decreases. Then, the pressure that is applied to the right side of the piston becomes greater than the pressure that is applied to the left side of the piston. This compresses the spring and tilts the lug plate. As a result, the piston stroke increases and the discharge capacity increases.

Crank Chamber Pressure + Spring Force

Solenoid Control Valve

Piston Stroke: Large

Crank Chamber Pressure + Spring Force

Solenoid Control Valve

Piston Stroke: Large

• When the solenoid control valve opens (solenoid coil is not energized), the difference in pressure disappears. Then, the pressure that is applied to the left side of the piston becomes the same as the pressure that is applied to the right side of the piston. Thus, the spring elongates and eliminates the tilt of the lag plate. As a result, there is no piston stroke and the discharge capacity decreases.

Solenoid Control Valve

Piston Stroke: Small

Crank C Pressure + Spring Force

Solenoid Control Valve

Piston Stroke: Small

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