DeZurik MO User manual

DeZURIK MO MANUAL
OVERRIDE
FOR ROTARY DIAPHRAGM ACTUATORS
Instruction D10114
August 2012

DeZURIK
MO Manual Override for Rotary Diaphragm Actuators
D10114 © 2012 DeZURIK, Inc.
Instructions
These instructions provide information about the MO manual override used with the DR40, DR55 and
DR85 Rotary Diaphragm actuators. They are for use by personnel who are responsible for installation,
operation and maintenance of Rotary Diaphragm actuators.
Safety Messages
All safety messages in the instructions are flagged with an exclamation symbol and the word Caution,
Warning or Danger. These messages indicate procedures that must be followed exactly to avoid
equipment damage, personal injury or death. Safety label(s) on the product indicate hazards that can
cause equipment damage, personal injury or death. If a safety label becomes difficult to see or read, or
if a label has been removed, please contact DeZURIK for replacement label(s).
Personnel involved in the installation or maintenance of valves should be constantly alert to
potential emission of pipeline material and take appropriate safety precautions. Always wear
suitable protection when dealing with hazardous pipeline materials. Handle valves that have
been removed from service with the assumption of pipeline material within the valve.
Inspection
Your MO manual override has been packaged to provide protection during shipment; however, it can
be damaged in transport. Carefully inspect the unit for damage upon arrival and file a claim with the
carrier if damage is apparent.
Parts
Recommended spare parts are listed on the assembly drawing. These parts should be stocked to
minimize downtime.
Order parts from your local DeZURIK sales representative, or directly from DeZURIK. When ordering
parts, please include the 7-digit part number and 4-digit revision number (example: 9999999R000)
located on the data plate attached to the valve assembly. Also include the part name, the assembly
drawing number, the balloon number and the quantity stated on the assembly drawing.
DeZURIK Service
DeZURIK service personnel are available to install, maintain and repair all DeZURIK products.
DeZURIK also offers customized training programs and consultation services.
For more information, contact your local DeZURIK sales representative or visit our website at
www.dezurik.com.

DeZURIK
MO Manual Override for Rotary Diaphragm Actuators
August 2012 Page 3 D10114
Table of Contents
Description - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4
Operation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4
To Open the Valve - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4
To Close the Valve - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4
Removing the Manual Override - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5
Installing the Manual Override - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 6

DeZURIK
MO Manual Override for Rotary Diaphragm Actuators
D10114 Page 4 August 2012
Description
This manual override is designed specifically to manually operate the valve if the air supply to the
actuator is interrupted. This manual override contains no customer serviceable components and should
not be disassembled.
The Rotary Diaphragm Actuator includes a compressed spring. Death or serious injury can
result if the spring cover is removed incorrectly.
FOLLOW THE INSTRUCTIONS CAREFULLY TO ENSURE SAFETY!
Operation
If the actuator action has been changed from spring-to-open to spring-to-close or vice-versa, the
direction of the handwheel rotation will be opposite from that described below.
To Open The Valve
Turn the manual override handwheel counter-clockwise. The pointer on the actuator will indicate
valve position.
To Close The Valve
Turn the manual override handwheel clockwise. The pointer on the actuator will indicate valve
position.
NOTE: Before returning the actuator to automatic operation, make sure the manual override is turned
all the way out so it does not interfere with actuator operation.

DeZURIK
MO Manual Override for Rotary Diaphragm Actuators
August 2012 Page 5 D10114
Removing the Manual Override
1. Shut down the flow in the pipeline.
Flow in the pipeline with the actuator removed can slam the valve closed causing
personal injury and damaging the flow system. Shut down the flow in the pipeline
before removing the actuator from the valve.
2. Disconnect and lock out the pneumatic power to the actuator to prevent accidental operation of
the actuator.
Moving parts from unexpected operation of a powered actuator can cause personal
injury or equipment damage. Disconnect and lock out power to the actuator before
servicing.
3. Make sure the manual override is turned all the way out, then relieve the air pressure to the
actuator.
The Rotary Diaphragm Actuator includes a compressed spring. Death or serious injury can
result if the spring cover is removed incorrectly.
FOLLOW THE INSTRUCTIONS CAREFULLY TO ENSURE SAFETY!
4. Remove three screws, nuts and washers that fasten the diaphragm cover to the spring case.
Note: The three screws removed must be equally spaced as shown in Figures 1 and 2.
5. For DR40 actuators: Obtain three 5/16" diameter threaded rods, each at least 3" (75 mm) long,
and nine 5/16" nuts. As shown in Figure 1, assemble one rod and three nuts in each of the three
holes from which the screws were removed in the previous step. Jam the double nuts together
by tightening to 14 ± 2 foot pounds (19 ± 3 Nm); tighten the single nuts finger tight against the
cover.
For DR55 and DR85 actuators: Obtain three 3/8" diameter threaded rods, each at least 8"
(200 mm) long, and nine 3/8" nuts. As shown in Figure 2, assemble one rod and three nuts in
each of the holes from which the screws were removed in the previous step. Jam the double
nuts together by tightening to 26 ± 3 foot pounds (35 ± 4 Nm); tighten the single nuts finger tight
against the cover.
6. Remove the remaining screws, nuts and washers that fasten the diaphragm cover to the spring
case.
7. Turn the single nuts counterclockwise—carefully, evenly, and slowly— from each of the three
threaded rods. Continue turning each nut until the spring force is fully relieved from the
diaphragm cover. Then remove the nuts, the threaded rods, and the diaphragm cover from the
actuator.

DeZURIK
MO Manual Override for Rotary Diaphragm Actuators
D10114 Page 6 August 2012
Installing the Manual Override
1. If the manual override was removed from the diaphragm cover, apply a bead of non-hardening
sealant such as Loctite Permatex Form-A-Gasket #2 to the mating surfaces of the manual
override housing and diaphragm cover, then fasten the manual override to the diaphragm cover.
2. For DR40 actuators: Mount the diaphragm cover to the spring case with screws, nuts, and
washers. Place the caution tag and washer under one of the screws. Tighten the screws evenly
until the rubber diaphragm is in contact with the cover and the spring case. Then tighten the
screws in a crisscross pattern to 80 ± 2 inch pounds (9.0 ± 0.2 Nm).
For DR55 and DR85 actuators: Mount the diaphragm cover to the spring case with screws,
nuts and washers. Place the caution tag and washer under one of the screws. Tighten the
screws evenly until the rubber diaphragm is in contact with the cover and the spring case. Then
tighten the screws in a crisscross pattern to 12 ± 2 foot pounds (16 ± 3 Nm) for the DR55, or
18 ± 2 foot pounds (24 ± 3 Nm) for the DR85.
3. Connect the actuator piping.
4. Pipeline flow may now be restored.

DeZURIK
MO Manual Override for Rotary Diaphragm Actuators
August 2012 Page 7 D10114
Figure 1—Stud Requirements For DR40 Diaphragm Cover Removal
Figure 2—Stud Requirements For DR55 and DR85 Diaphragm Cover Removal