Emerson Fisher 4320 Instruction Manual page 23

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4320 Position Monitor

October 2012

Figure 16. 4-Way Spool Valve Installation

SUPPLY

EXHAUST OF PORT 4

(WHEN ACTUATOR OPENS)

PORT TO

ACTUATOR CLOSE

PORT TO CLOSE

DOUBLE-ACTING ACTUATORS

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)

PORT TO

ACTUATOR OPEN

ALWAYS INSTALL

VENTS (SUPPLIED)

SUPPLY

PORT TO OPEN

FAIL LAST POSITION

ALWAYS INSTALL

VENTS (SUPPLIED)

SUPPLY

PORT TO OPEN/CLOSE

PLUG

SPRING RETURN ACTUATORS

Instruction Manual

D103621X012

5 1 3

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