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Instruction Manual
D103621X012
4320
January 2018
21
Never plug, block or restrict port 5 as any blockage or restriction may cause an internal pressure buildup inside the
enclosure, resulting in damage to the housing gasket.
Install the supplied vents in the exhaust ports (ports 3 and 5) to prevent debris from falling into the spool valve. Apply a
general purpose thread sealant to pipe threads and fittings. A flow control, such as a needle valve, may be used in Port
3, but should never be used in Port 5. To achieve IP67 protection, remote venting of ports 3 and 5 is required.
Figure 15. 4-Way Spool Valve Installation
NOTE:
1 THE DD POINTS TO THE PILOT VALVE PORTS AND NOT SPECIFICALLY TO THE
SPOOL VALVE PORTS.
EXHAUST OF PORT 2
(WHEN ACTUATOR CLOSED)
EXHAUST OF PORT 4
(WHEN ACTUATOR OPENS)
SUPPLY
PORT TO
ACTUATOR CLOSE
PORT TO
ACTUATOR OPEN
ALWAYS INSTALL
VENTS (SUPPLIED)
ALWAYS INSTALL
VENTS (SUPPLIED)
PLUG
PORT TO OPEN/CLOSE
PORT TO CLOSE
PORT TO OPEN
SUPPLY
SUPPLY
FAIL LAST POSITION
5 1 3
4 2
DOUBLE-ACTING ACTUATORS
SPRING RETURN ACTUATORS
1
5 1 3
4 2