Marwin Valve 3T3700 Series 3-Way Ball Valve User Manual

Scope, Applicability, Caution

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3170 Wasson Road • Cincinnati, OH 45209 USA

Phone 513-533-5600 • Fax 513-871-0105

[email protected] •

I & M 3T3700/3L3800 Series

Installation & Maintenance Instructions for Marwin

3T3700/3L3800 Series Three Way Ball Valves

Warning: Marwin Valve Ball Valves must only be used, installed and repaired in accordance with these Installation &
Maintenance Instructions. Observe all applicable public and company codes and regulations. In the event of leakage
or other malfunction, call a qualified service person; continued operation may cause system failure or a general hazard.

Please read these instructions carefully!

Your Marwin Valve product will provide you with long,
trouble-free service if it is correctly installed and main-
tained. Spending a few minutes now reading these in-
structions can save hours of trouble and downtime later.
When making repairs, use only genuine Marwin Valve
parts, available for immediate shipment from the factory.


This manual is intended as a guide to assist customers
in the storage, installation, and maintenance of Marwin
3T3700/3L3800 Series Three Way Ball Valves. Subse-
quent additions or special instructions will be provided
for special ball valves, critical service, or customer re-


This manual is applicable to the 3T3700/3L3800 Series
Marwin three way ball valves.


Valve pressure ratings are based on many vari-


ables, including valve series and size, as well as
body, seat and bolt material. Verify that application
does not exceed the pressure or temperature rat-
ing on the nameplate.



depressurize the line with the valve in the

OPEN position before disassembly. Cycle valve in
depressurized line before removing valve.
Wear protective equipment and take appropriate


precautions to safeguard against injury caused by
the discharge of trapped fluids.
Use only Marwin recommended spare parts for


To ensure safety and maintain warranty, never


modify valve in any way without prior approval from


A petroleum-based oil (silicone free) is used as lubrica-
tion on all internal surfaces. This may be removed with a
solvent if found objectionable. All valves are adequately
packed in a strong cardboard case in such a way as to
avoid any possible damage during transport and storage.

CAUTION: If ball valves are not destined for immedi-
ate use, the following precautions should be taken:

If possible, leave the ball valves in their packing


cases during the period of storage.
Ball valves must remain in open position during this


In order to prevent damage, protective plastic cov-


ers on valve ends should not be removed until im-
mediately prior to installation.
It is advisable to store the valves in waterproof


conditions. Ball valves should be protected to safe-
guard against humidity, moisture, dust, dirt, sand,
mud, salt spray, and seawater.
All valves complete with actuators are to be stored


in dry conditions.
Valves to be stored for a long period of time should


be checked by the quality control personnel every
six months; every three months when valves are

Maintenance During Storage Period

Internal surface should be inspected to check for

dust or other foreign objects.
Rust or dust must be removed by cleaning with