Setting The Stroke Limit Stops; Hydraulic Fluid - Emerson Bettis SMART EHO G Series Service Instructions Manual

Section 2: Installation
September 2020
2.6

Setting the Stroke Limit Stops

2.6.1
2.6.2
2.6.3
2.6.4
CAUTION
!
Always use the hand pump to move the actuator off the stop before attempting to turn the
adjusting screw.
2.6.5
2.7

Hydraulic Fluid

Bettis Electro-Hydraulic Operated actuators are shipped with the reservoir filled to
operation level. Before commissioning and periodically afterwards, check to see the fluid
level is correct. The oil fill cap is provided with a dipstick marked with a green and
a red mark. When the optional accumulator is drained of fluid and the actuator is at
Fail-safe Position, the oil should be at the green mark. The reservoir also has a sight gauge
for the purpose of seeing fluid is present. Should fluid need to be added or replaced,
use only factory approved hydraulic fluid.
This specification covers hydraulic fluids which are approved by engineering for use in
Bettis Electro-Hydraulic Operated actuator in a temperature range from -40°F to 140°F
(-40°C to 60°C).
12 12
The Bettis G or E-Series Actuator is provided with bi-directional travel stops
allowing 80° to 100° total travel (+/- 5° adjustment at each end of the 90° stroke).
Actuators are shipped from the factory with the travel stops adjusted for
approximately 90° rotation. Generally, it is necessary to make slight travel
stop adjustments once the actuator is installed on the valve. Refer to the valve
manufacturer's recommendations for specific requirements.
When the valve has internal stops, the actuator stops must be set so that the load
is applied to them, not the valve stops.
If adjustment is required, use the hand pump to move the actuator off the stop at
the Fail-safe Position before attempting to turn the adjusting screw (refer to 4.4,
Hand Pump Operation).
With the Fail-safe Position stop set, use the hand pump to move the actuator to
the other end of the stroke and check the stop position. If adjustment is required,
slowly pump the actuator off the full stroke position.
Service Instructions
MAN-02-08-77-0714-EN Rev. 2
Installation