Setting The Stroke Limit Stops; Hydraulic Fluid - Emerson Bettis Electro-Hydraulic Operated Installation, Operation And Maintenance Manual

Section 2: Installation
February 2021
2.6

Setting the Stroke Limit Stops

2.6.1
2.6.2
2.6.3
2.6.4
CAUTION
!
Always use the handpump 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).
2.7.1
•
•
Although other brands of fluid matching the same specifications may be used, to maintain
the warranty and ensure trouble free operation, always check with the factory before
substituting any other fluid.
12
The Bettis G-Series 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 handpump to move the actuator off the stop at
the closed position before attempting to turn the adjusting screw (refer to 4.4,
Handpump Operation).
With the closed position stop set, use the handpump 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.
Approved Fluids
Standard Fluid [use with -20°F to 140°F (-29°C to 60°C) applications]
— ConocoPhillips Megaflow™ AW HVI Hydraulic Oil 22
— Shell Tellus S2 V 22
— Mobil DTE 10 Excel™ 22
Low Temperature Fluid [use with -40°F to 140°F (-40°C to 60°C) applications
— Mobil Univis™ HVI 13
Installation, Operation and Maintenance Manual
VCIOM-13254-EN Rev. 3
Installation