I
MO-D52/R52
1
9/21 Rev. 0
DIAPHRAGM-OPERATED
ACTUATORS
STANDARD SPECIFICATIONS
Installation, Maintenance & Operating Instructions
Model
Diaphragm
(Effective area in
square inches)
Standard
Strokes
(in inches)
D52B / R52B
85
¾, 1
D52C / R52C
145
1
⅛
, 1½
D52D / R52D
325
2¼, 3½
Read these instructions carefully before installation or servicing.
WARNING!
FOR YOUR SAFETY AND PROTECTION, IT IS IMPORTANT THAT THE FOLLOWING PRECAUTIONS BE
TAKEN PRIOR TO REMOVING THE VALVE FROM SERVICE OR BEFORE ANY DISASSEMBLY OF THE VALVE:
1. At all times during this procedure, keep hands out of the valve. A remotely actuated valve could close at any
time and result in serious injury.
2. Know what media is in the line. If there is any doubt, check with the proper authority.
3. Wear any protective clothing or equipment normally required when working with the media involved.
4. Depressurize the line and valves as follows:
a. Open the valve and drain the line.
b. Close and open the valve to relieve any residual pressure that may be in the valve prior to removing the valve
from service.
c. After removal and prior to any disassembly, drain any remaining media by placing the valve in a vertical
position and carefully opening and closing the valve several times.
5. The practical and safe use of this product is determined by both the trim and body ratings. Read the name tags
and check both ratings. This product is available with a variety of trim materials. Some of the trim materials have
pressure ratings that are less than the body ratings. All the body and trim ratings are dependent on valve type and
size, trim material, bolting material, and temperature. Do not exceed these ratings.
KOSO HAMMEL DAHL
CONTROL VALVES
KOSO HAMMEL DAHL
253 Pleasant Street
West Bridgewater, MA 02379
tel: 774.517.5300
fax: 774.517.5230
