Cylinders - Lifting/Lowering, Single-Acting (1)

The example shows two circuits for lifting and lowering a single acting cylinder.

Benefits of this circuit arrangement

Fig.1 shows a leak free poppet-type solenoid valve DF*A, that holds the cylinder in a lifted position. The cylinder can be lowered by energizing the DF*A solenoid or using the manual over-ride in an emergency. The lowering speed is determined by the setting of NF* in the tank line. Activating the 2/3 way DM*A directional valve will extend the cylinder at a rate determined by the NF* valve in the pressure line of the DM*A.
Fig.2 shows a leak free poppet-type solenoid valve HD*A, that holds the cylinder in a lifted position. The cylinder can be lowered by energizing the HD*A solenoid or using the manual over-ride in an emergency. The lowering speed is determined by the setting of NF* in the tank line. The cylinder is extended directly via the flow from a pump through a check valve.

Schematics[ + ]