45
Service Instructions
MAN-02-08-77-0714-EN Rev. 2
September 2020
Section 6: Operation
Operation
6.4
Functional Description
The following is a functional description of the Bettis Electro Hydraulic Actuator and a brief
explanation of the main components. Throughout this explanation, numbers which appear in
in [ ] correspond to components labeled on the wiring diagram. Numbers in ( ) correspond to
components labeled on the schematic diagram. Information in (( )) is descriptive.
6.4.1
Double-Acting Without Accumulator and ESD Solenoid Valve
NOTE:
Refer to Section 10.1 for Hydraulic Schematic 11794-S, however the project specified
schematic may be slightly different in the numbering sequence and should be referred to
determine the actual options provided.
6.4.1.1
Power Stroke ((Open/Close))
Either one of the two closing or opening solenoids (J) or (K) are energized open and
the motor (Z) drives the hydraulic pump (Y) to supply the actuator open or closing
port thru the energized solenoid.
6.4.1.2
Manual Hand Pump Stroke
a.
Open the hand pump selection isolation valve (M) to the pump position.
Note: both isolation valves (M) must be engaged whether hand pumping
open or close.
b.
Select and push the open or close knob on the hand pump (L).
c.
Stroke the hand pump (L) until the OPEN/CLOSE stroke is completed.
d.
Push the manual relief valve located on the hand pump to retract the
pump ram back into the pump body and pull the pump handle down.
e.
Upon completion of the OPEN/CLOSE hand pump stroke, return both
hand pump selection isolation valves back to the automatic position.
6.4.2
Double-Acting with Optional Accumulator and ESD Solenoid Valve
Functional Description
NOTE:
Refer to Section 10.2. for Hydraulic schematic 11516-S, however the project specified
schematic may be slightly different in the numbering sequence and should be referred to
determine the actual options provided.
