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Operation and Service Manual
Document No. I-0004 Rev. 6: 1996-06-06
March 27, 2003 - Page Three
IV MODEL IDENTIFICATION
Series 35 thru 70 (Series 35, 50, 60 and 70) have a one piece drive case, with stem extended from top and
bottom. Refer to Fig. No. 1. The series numbers refer to piston diameter. (Eg. Model 50D refers to a double
acting operator with a 5" diameter piston.) The letters immediately following the series number refer to type
of operation:
"S"
"S" Series use only one double acting cylinder. Singe acting. Pressure can be applied to one
side of the piston to move it in one direction only. Force for the return stroke is provided by the
opposing single acting piston or spring.
"D"
"D" Series use two double acting cylinders. Double acting. Pressure may be applied to either
side of the piston to move it in either direction.
"SSR" Spring return, with one single acting piston acting against the spring.
"DSR" Spring return, with two single acting pistons acting against the spring.
"MJ"
Suffix following any of the above indicates jackscrew.
"MH"
Suffix following any of the above indicates hydraulic manual override.
Series 83 thru 163 (Series 83, 103, 123, 143, 163), Series 85 thru 185 (Series 85, 105, 125, 145, 165 and
185) and Series 127 thru 187 (Series 127, 147, 167, 187) have a two piece drive case, with the yoke fitted
directly over the valve stem or adaptor and keyed. Refer to Fig. No. 2. The series numbers refer to piston
diameter and lever arm. The letters immediately following the series number refer to type of operation.
"S"
One double acting piston, the opposite end of the operator being simply a drive rod cover.
"D"
Two double acting pistons.
"DSR" Spring return, with two single acting pistons acting against the spring.
"M"
Suffix following any of the above indicates hydraulic manual override.
(Eg. Model 85D refers to a double acting operator with a 8" diameter piston and 5" lever arm. Model 127D
refers to a double acting operator with a 12" diameter piston and 7" lever arm.)
WARNING NOTE: Do not disassemble spring cartridge in spring return models. This unit is under
load and must be returned to the factory for service.
®
E-Series Rotary and
Linear Operations
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