35
Service Instructions
MAN-02-08-77-0714-EN Rev. 2
September 2020
Section 4: Set-up/Start-up Procedure
Set-up/Start-up Procedure
4.9.1.5
Upon completion of the open or close stroke, the Limit Switch(s) can be
configured to de-energized the solenoid that is energized. Some field
installations can use the customer’s control room logic to de-energize
the solenoids after the actuator stroke open or close is reached.
4.9.2
Double-Acting Actuator with an (Optional) ESD Solenoid Valve and Accumulator
Figure 20
2-Way Remote Electric Without an ESD Solenoid Function Schematic
(M)
Hand Pump Selection Valves
(L)
Hand Pump Selector
(J)
Opening Solenoid
(K)
Closing Solenoid
K
J
L
M
I
M
NOTE:
The components referenced below are referencing Schematic 4.8.2. and is for illustration
purposes only. When using this procedure refer to the Bettis EHO Actuator General
Arrangement Drawing and Hydraulic Schematic for the unit being worked on.
4.9.2.1
Ensure both Hand Pump Selection Valves (M) are in the automatic
open position.
4.9.2.2
ESD (Emergency Shut Down) Solenoid Valve (P)is constantly
energized closed.
4.9.2.3
Ensure Isolation Valve (H) is closed and Isolation Valves (N) and (O)
are both open.
