Igeneral; Installation; Maintenance - Emerson Betis E Series Operation And Service Manual

Operation and Service Manual
Document No. I-0004 Rev. 6: 1996-06-06
March 27, 2003 - Page Two
I GENERAL
Bettis "E-Series" linear operators are cylinders adapted to gate and globe valves and the like. Bettis "E-
Series" quarter turn operators use a scotch yoke mechanism to convert piston motion to a 90° rotation.
II

INSTALLATION

Place operator and valve in the same position (both open or both closed) and both safely maintained in that
position (ie. line depressurized for gate and butterfly valves). Remove valve lever, handwheel or gear, per
valve-manufacturer instructions. Check mounting surfaces, coupling, and orientation of the operator to the
valve for any discrepancy. Set operator in position on the valve, and install all bolts and nuts. Align the opera-
tor to the valve stem while bolts are somewhat loose, then tighten bolts/nuts evenly and completely to
mechanics standard torque or specifications (Page 10). Adjust operator end stops for fully open and fully
closed positions, ensuring operator, not valve stops, absorb the load, except in special cases per valve-man-
ufacturer explicit instructions.
NOTE: Operators shipped with valves have the end stops set at the factory, and should not require
further adjustment.
III MAINTENANCE
The only servicing expected under normal operating conditions is O-ring and gasket replacement. Only cylin-
der disassembly is necessary for O-ring and gasket replacement, but full disassembly instructions will be
provided by this manual. Tools and material required are:
- a set of standard sized wrenches
- snap ring pliers
- a pair of 10" or longer screwdrivers
- petroleum grease
- Dow Corning 55M grease or equivalent
- a tube of sealant (eg. silicone)
- commercial solvent (eg. varsol)
- leak detecting fluid (eg. soapy water)
All part numbers referred to are listed on the schematic diagrams Fig. No. 1 and No. 2. O-rings, gaskets and
other soft parts, are available from the factory as repair kits. Lubricant also available from factory.
Please contact the factory or representative for repair kits or additional information, and include the
complete serial number.
®
E-Series Rotary and
Linear Operations