Leslie Controls DOT 3-WAY User Manual

12501 Telecom Drive, Tampa Florida 33637

Installation, Operating and

Maintenance Instructions

Supplement

10/8.5.1

Rev. 1

DOT 3-WAY CONTROL VALVE

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

TABLE OF CONTENTS

ACTUATOR MAINTENANCE REPLACING DIAPHRAGMS, ETC.........5

GENERAL – FOR DIRECT AND REVERSE ACTING ACTUATORS..................................................5

DIRECT ACTING .....................................................................................................................................6

DISMANTLING SIZES 35, 55, 55A, 85
REASSEMBLY

REVERSE ACTING..................................................................................................................................6

DISMANTLING SIZES 35R, 55R, 55AR, 85R (See Figure 5)
REASSEMLBY
PRE-SETTING STEM SEAL – (55R AND 85R)
PRE-SETTING STEM SEAL – (35R)

MOUNTING ACTUATOR TO MAIN BODY..........................................................................................6

TO CHANGE VALVE ACTION FROM NORMALLY OPEN TO NORMALLY CLOSED OR VICE-

VERSA.......................................................................................................................................................8

PROCEDURE

............................................................................................................................................6

............................................................................................................................................6

............................................................................................................................................8

............................................................................................................6

...............................................................................6

.................................................................................................6

...............................................................................................................6

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

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ILLUSTRATION INDEX

FIGURE 1 – CONVERGING OR MIXING SERVICE.........................................................................................................................................4

FIGURE 2 – DIVERGINGSERVICE....................................................................................................................................................................4

FIGURE 3 – DOUBLE PORTED CONTROL VAVLE........................................................................................................................................5

FIGURE 4 – 55 & 55A ACTUATORS..................................................................................................................................................................7

FIGURE 5 – 55R (AR) & 85R (AR) ACTUATORS.............................................................................................................................................7

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INTRODUCTION

This Installation, Operation, and Maintenance Manual is
intended to be as complete and up to date as possible. It
covers installation, operation, and maintenance procedures
for Leslie Controls, Inc. DOT 3-Way Control Valve. Leslie
reserves right to update this manual and other product
information concerning installation, operation, and/or
maintenance, at any time and without obligation to notify
product owners of such changes.

Leslie is not responsible for injury to personnel or product
damage due to improper installation, operation, and/or
maintenance Leslie Controls, Inc Back Pressure
Regulators. All installation, operation, and maintenance
procedures should only be performed by trained/certified
personnel. All personnel performing these procedures
should completely and carefully read and understand all
supplied materials before attempting procedures. All
personnel should pay strict attention to all Notes, Cautions,
and Warnings that appear within procedures detailed in
this manual.

Leslie welcomes user input as to suggestions for product or
manual improvement.

Contact Information

For information concerning warranties, or for questions
pertaining to installation,
Operation or maintenance of LESLIE products, contact:

LESLIE CONTROLS INC.
12501 Telecom Drive
Tampa, FL 33637

USA Phone: [phone]
USA Fax: [phone]

www.LESLIECONTROLS.com
To order replacement parts, contact LESLIE CONTROLS
at address listed above, or call toll free:

USA/Canada/Caribbean Phone: [phone]

Note: Please include model and serial number of unit for
which parts are being ordered. If ordering by phone, please
have this information readily available.

GENERAL NOTES AND WARNINGS

Notes:

• If questions are not answered by this manual, or if

specific installation, operation, and/or maintenance
procedures are not clearly understood, contact Leslie
Controls, Inc. for clarification before proceeding.

• If unit is damaged during installation, operation, or

maintenance, complete following steps:

1. Turn off and lock out pneumatic supply to unit in
an approved manner.

2. Turn off all incoming valves.

3. Contact in-house maintenance personnel or Leslie
Controls, Inc. for instructions.

Note: Throughout this manual, warnings will be
denoted by BOXES

Piping system must be adequately designed and

supported to prevent extraordinary loads to pressure

It is strongly recommended that this document be reviewed
before attempting any installation, operation, or
maintenance procedures.

CAUTION!

equipment.

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