Modentic GTF-300 User Manual

Document No. : MD-QO-04-49
Date : 2009/03/13

Version : 1.0

Stainless Steel Gate Valves, API 603

ANSI CLASS 300

USER MANUAL

Modentic Industrial Corporation

14F-1,No.57Taya Rd.,Taichung,Taiwan,R.O.C.

Email:[e-mail]

http://www.modentic.com.tw

WARRANTY

Modentic warrants its products against defects in manufacturing if the products
Are used for the purposes for which they are manufactured and sold. This warranty
Shall expire one year from date of shipments.

1. To use for company in Europe who will place the product on the market , please amend which

necessary.

2.

Modentic reserves the right to change any details without prior notice.

Contents

1. General Precautions

2. General Description of Product

3. Pressure-Temperature Ratings

4. Delivery Condition and Storage

5. Installation and Operation

6. Put into service

7. Dangers of inappropriate use

8. Maintenance

9. Corrosion Data

10. Use in potential explosive atmosphere areas

11. Marking

Importer, Agent or Distributor responsible for servicing

1. General Precautions
a. Operation:

Gate valve is a kind of isolating valve used in
a pipe line system, which intended for use
only in the closed or fully open position. In
the open position, it allows the flow passes
through.

b. Material Selection:

The possibility of material deterioration in
service and the need for periodic inspections
is depended on the contained fluid. Carbide
phase conversions to graphite, oxidation of
ferrite materials will decrease in ductility of
carbon steels at low temperature are among
those items. However information about
corrosion data is provided together with this
user manual, the user is requested to take
attention or consideration to determine the
suitability of material in their application.

c. Pressure-Temperature rating:

The Pressure-Temperature rating is
considered for static pressure. Please refer
to P & T rating section 3 for actual
application. The allowable temperature is
between -20°C and 180°C. Do not exceed
the temperature range to avoid danger.

d. Fluid thermal expansion:

It is possible, when the Gate valve is in
closed condition, the sealed cavity within the
valve body to be filled with liquid. If this liquid
is not released, by partially opening the
valve or some other means, and it is subject
to a temperature increase, excessive
pressure sufficient to cause pressure
boundary failure can be occurred. However
our products have pressure self-relief seat to
prevent pressure built up, user is
recommended to prevent that the pressure
in the valve will not exceed that allowed
pressure, by means of piping design,
installation, or operation procedure.

e. Electro Static effect:

The Gate valves are designed with electrical
continuity for ball-stem-body to prevent
electro static discharge. The user is

responsible for ensuring the earthing of the
pipeline system.

f. Fire safe condition:

Fire safe certificates are only available upon
request.

g. Liquids with high fluid velocity:

The Gate valves might be operated frequently
with very high velocity liquids, a check shall
be made with the valve distributor or
manufacturer for appropriate advice to
minimize the possibility of seat deformation,
especially when they are highly pressurized
on high-temperature line.

h. Throttling service:

Gate valves are generally not recommended
for throttling service, where both the fluid flow
and the leading edge of the ball can damage
or deform the resilient ball seats causing
leakage. High fluid velocity or the presence of
solid particles in suspension will further
reduce seat life in throttling applications.

i. Do not open the bonnet or cap when bearing

pressure. Valve is not equipped with pressure
access device. User should check it by other
method through its piping system.

j. Do not touch the surface of valve at high

temperature condition.

k. Not allowed for unstable fluid, otherwise

specified with PED catogory III in Declaration
of conformity or/and in this user manual.

l. Lock design on the handle to avoid the valve

by un-intended operated by un-authorized

person.

m. Use in potential explosive atmosphere safely,

see section 10 for detail.

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