Operating Instructions, Form No. 102875, Back sheet 5 of 8
VALVE OPTIONS CONTINUED -
9505
Figure 4
9610
Solenoid Controlled, Pilot Operated Valve Used With Single-acting Cylinders
OPERATION
Neutral (HOLD): When neither solenoid is energized, fluid from pump is
directed back to tank and fluid from cylinder is checked in the cylinder.
Advance: When solenoid "B" is energized, fluid from pump is directed
through pressure port to cylinder.
Return: When solenoid "A" is energized, fluid from the pump and from the
cylinder is directed back to tank. 9599
NOTE: Pressure holds without loss when shifted from cylinder port to the neutral (HOLD) position.
Solenoid Controlled, Pilot Operated Valve Used With Double-acting Cylinders
OPERATION
Neutral (HOLD): When both solenoids are de-energized, fluid from
pump circulates at free flow from the pressure port "P" to tank "T". Both
cylinder ports are blocked.
Solenoid "A" Energized: Pressure to cylinder port "A".
Cylinder port "B" to tank.
Solenoid "B" Energized: Pressure to cylinder port "B".
Cylinder port "A" to tank. 9512
NOTE: Pressure holds without loss when shifted from
cylinder port to the neutral (HOLD) position.
Automatic Dump Valve
1. Activate the pump unit to advance the cylinder.
2. Release the remote switch to release pressure and retract the cylinder.
DANGER: Ne
ver use this valve for lifting a load!
"Posi-Check" Valves
If a "Posi-Check" open center valve is used, a hydraulic gauge in
the gauge port shows zero pressure when the valve is switched to
the neutral (hold) position. Cylinder pressure, however, is held
without loss. If reading the cylinder pressure, a gauge must be
installed in the outlet port of the valve.
To install a hydraulic gauge (refer to Figure 4):
1. Remove the pipe plug from the valve's gauge port.
2. Install a steel 45° elbow fitting.
3. Install the gauge into the 45° elbow fitting.
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