Leslie Controls DOT 3-WAY CONTROL VALVE - Manual

1
DOT 3-WAY CONTROL VALVE
TABLE OF CONTENTS
INSTALLATION
...............................................................................................................................4
VALVE POSITION ...................................................................................................................................4
PROBLEM PREVENTING PROCEDURES ............................................................................................4
OPERATION
.......................................................................................................................................4
MAINTENANCE OF VALVE BODY SUB-ASSEMBLIES
..................................5
DISMANTLING THE DOT 3-WAY CONTROL VALVE.......................................................................5
CLEANING-REPLACING PARTS ..........................................................................................................5
ACTUATOR MAINTENANCE REPLACING DIAPHRAGMS, ETC.
........5
GENERAL – FOR DIRECT AND REVERSE ACTING ACTUATORS..................................................5
DIRECT ACTING .....................................................................................................................................6
DISMANTLING SIZES 35, 55, 55A, 85 ............................................................................................................6
REASSEMBLY ............................................................................................................................................6
REVERSE ACTING ..................................................................................................................................6
DISMANTLING SIZES 35R, 55R, 55AR, 85R (See Figure 5) ...............................................................................6
REASSEMLBY ............................................................................................................................................6
PRE-SETTING STEM SEAL – (55R AND 85R) .................................................................................................6
PRE-SETTING STEM SEAL – (35R) ...............................................................................................................6
MOUNTING ACTUATOR TO MAIN BODY..........................................................................................6
TO CHANGE VALVE ACTION FROM NORMALLY OPEN TO NORMALLY CLOSED OR VICE-
VERSA.......................................................................................................................................................8
PROCEDURE ............................................................................................................................................8
CONTROL VALVE REASSEMBLY AND ADJUSTMENT
................................8
REASSEMBLY (SIZES 1” – 2”) ...............................................................................................................8
HOW TO MAKE PRELOAD ADJUSTMENT .........................................................................................8
HOW TO ADJUST CONTROL VALVE FOR RATED TRAVEL AND POSITIVE COMPRESSION
FORCE.......................................................................................................................................................8
CONTROL
VALVES WITH DIRECT ACTING ACTUATORS .............................................................9
CONTROL VALVE WITH REVERSE ACTING ACTUATORS (AIR PRESSURE MOVES VALVE
PLUG STEM UPWARD.) .........................................................................................................................9
SHORT VALVE TRAVEL........................................................................................................................9
12501 Telecom Drive, Tampa Florida 33637
Installation, Operating and
Maintenance Instructions
Supplement
10/8.5.1
Rev. 1