Leslie Controls DOT 3-WAY CONTROL VALVE - Manual (Page 4)

4
INSTALLATION
VALVE POSITION
Install control valve in an accessible location. Connect
supply and outlet pipe lines to valve as described below.
Control valve may be placed in any position but upright is
preferable for ease of maintenance. Connect operating
medium tubing from control pilot, instrument or loading
device to diaphragm chamber connection of control valve
or to valve positioner if one is in use.
PROBLEM PREVENTING PROCEDURES
a. Provide removal space above, below and around
control valve for easy removal of parts during
maintenance.
b.
Blow or flush out pipe lines thoroughly before
installing control valve.
c. Protect control valve and following equipment with
a Self-Cleaning Strainer.
d.
Install stop valves and gauges in inlet and outlet
lines to provide means for checking equipment.
e.
Adhere to good piping practice.
OPERATION
See Leslie application guide for other operating
instructions.
a. Close inlet and outlet stop valves.
b.
Check that control valve responds properly through
rated travel in relation to changes in operating
pressure on the diaphragm. Rated travel is shown by
position of travel indicator disc on valve stem
relative to travel indicator scale on yoke.
c. Manually operate control valves fitted with manual
operating devices through rated travel to check
freedom of movement.
d. Place control valve in operation in accordance with
instructions furnished with control pilot or other
operating device.