Emerson Fisher 785C Instruction Manual page 20

785C Actuator
May 2022
Figure 16. Handpump Schematic: Fast Stroke MHQ Handpump Type 1 for 785C Springless Double-Acting
PNEUMATIC REMOTE CONTROL TO OPEN
PRESSURIZE THE OPENING PNEUMATIC SUPPLY LINE.
THE OPENING TIME IS ADJUSTABLE BY THE FLOW REGULATOR 5-Fa.
PNEUMATIC REMOTE CONTROL TO CLOSE
PRESSURIZE THE OPENING PNEUMATIC SUPPLY LINE.
THE CLOSING TIME IS ADJUSTABLE BY THE FLOW REGULATOR 5-Fc.
EMERGENCY MANUAL OPERATION
DE-PRESSURIZE BOTH PNEUMATIC SUPPLY LINE AND OPEN BOTH
STOP VALVES 351C AND OPEN BOTH STOP VALVES 351A/B.
SELECT BY THE VALVE "D" THE OPENING OR CLOSING OPERATION
AND ACTUATE THE HAND PUMP "P".
CLOSE THE STOP VALVE 351A TO KEEP THE ACTUATOR IN OPEN
POSITION OR CLOSE THE STOP VALVE 351B TO KEEP THE
ACTUATOR IN CLOSED POSITION.
NOTE: THE VALVE "D" MUST BE IN "REMOTE CONTROL" POSITION
AND THE STOP VALVES 351 MUST BE OPEN TO ALLOW THE
OPERATION WITH GAS SUPPLY.
20
1 DOUBLE-ACTING PNEUMATIC LINEAR ACTUATOR
3 HYDRAULIC CYLINDER
5 MANUAL OVERRIDE
R — RELIEF VALVE
P — HAND PUMP
D — HAND OPERATED DIRECTIONAL CONTROL VALVE
Fa — UNIDIRECTIONAL FLOW REGULATOR (OPENING OPERATION)
Fc — UNIDIRECTIONAL FLOW REGULATOR (CLOSING OPERATION)
351 STOP VALVE
395 RELIEF VALVE
Instruction Manual
D104483X012
PNEUMATIC SUPPLY
TO CLOSE
PNEUMATIC SUPPLY
TO OPEN