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:modentic@ms9.hinet.net
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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2. General description of the product
a. Technical specification
Model: Gate valve
Port: Standard Port
End connection: Flanged end
Service fluid Dangerous or non-dangerous gas or liquid
Service temp. -20°C to 180°C
Nominal Size NPS
Nominal Size DN
Nominal pressure LBS
2” 2½” 3” 4” 6” 8” 10” 12”
50 65 80 100 150 200 250 300
300 300 300 300 300 300 300 300
Shell Material ASTM A351 Gr.CF8M
Note 1: User shall consider the material’s anti-corrosion feature of components which directly contact
with the fluid. The corrosion data information is available in this user manual.
b. Safety features
Appropriate shell strength
Anti-blow out stem design
Anti-static design
Pressure release hole at ball
Pressure release channel at ball seat
c. Dimensions and Parts list
See the following drawing for the detailed
external dimensions of each nominal size,
the components list and materials available.
User shall consider the material’s
anti-corrosion feature of seals and packing
which directly contact with the fluid. The
corrosion data information is available in this
user manual.
d. Equipment category according to ATEX
Directive (94/9/EC)
Designed and constructed to good
engineering practice and the ignition hazard
assessment ensure that the equipment does
not contain any effective ignition sources in
normal operation and during expected
malfunctions. Therefore we classified as
Group II, Category 2 equipment. The Type
of ignition protection is ‘c’, constructional
safety according to EN 13463-5:2003.
e. Equipment category according to PED
Directive (97/23/EC)
Nominal Pressure
CLASS 300
S.E.P Category II
DN50
DN65
DN80
DN100
DN150
DN200
2
f. Dimensions/ Parts List
3
3. Pressure-Temperature Ratings
ready to install immediately.
The pressure-temperature rating of Gate valves
are determined, not only by valve shell
materials, but also by sealing materials used for
ball seats, stem packing, and body seal.
Sealing materials may be high molecule,
elasticity and hardness, however, the choice is
limited by the characteristics of the service fluid,
temperature, pressure, velocity of fluid,
frequency of valves operation and sizes of Gate
valves etc. User shall notice the maximum
temperature labeled on the name plate.
Followings are the general rating charts for
non-shock fluid service for floating Gate valves
by nominal pressure.
5. Installation and Operation
5.1 Cleaning
Even the valves was transported under a clean
environment, operator must check is there any
foreign body or dusts inside the bore. If yes,
clean it before installation. Operator clean the
valves by water, compression air, or steam
(automation valve shall be cleaned only with
water or steam, the compression air is not
allowed.)
5.2 Valve Installation
(Install to the pipeline system)
a. Direction
Gate valve does not restrict the flow direction.
Just consider the natural sequence to do opening
and close
b.
the valve.
Position
Temp. (°C) Class 300 (Bar)
-20 to 0 49.7
0 to 50 48.3
50 to 100 42.3
100 to 150 38.6
150 to 200 35.8
4. Delivery Condition and Storage
Valves stay in the open condition during the
transportation. Valves must store in an indoor
warehouse to avoid dusts and other foreign
object. Do not take off the dust cover except
Gate valve can be installed in any position, but
the operator shall consider the load of the pipe
line system not to apply at the connection area. It
will cause deformation and leakage.
c. Connecting to pipeline
Select the correct specification of bolts to fasten
the flange with pipeline.
To tight the bolts of the flange end caps, the force
must distribute on the every single bolt evenly.
The order to tight the bolts need to be
symmetrically.
5.3 Actuator installation
The Gate valves are designed with ISO 5211
actuator attachment. Following is the mounting
flange sizes.
The sizes of actuator and setting of the input
power or pressure of actuator are depended on
the operation torque. The following table lists
the maximum torque values of each flange type.
User is recommended to refer to the instruction
from actuator’s supplier. Overload torque
applied by the actuator may transfer the
un-intended load to Gate valve itself or to the
piping joints. Setting of the input power or
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pressure of the actuator is better not to exceed
1.5 times the Maximum torque of the valve.
5.4 Operation
a. For manual operation, shift the handle in
counter-clockwise direction for opening and
clockwise for close.
b.
If the handle is in parallel position with the
flow direction, the valve is open. If the
handle is in right angle position with the flow
direction, the valve is close.
c.
When installing actuator, the user should
ensure the position of the valve whether
open or close. The rectangular shape of the
stem top or the direction mark at the stem
top is in parallel with the flow direction
means the valve is opened.
6. Put into service
a. After install to the pipeline, it is necessary to
check the function of the product. Thus,
operate the valve about 3 times to ensure
the function.
b. Systems hydrostatic test
Before delivery, valves are tested 1.5 times
the allowable working pressure at ambient
temperature in open position. After
installation, the pipe line system may
subject to system tests, as condition not to
exceed the maximum working pressure.
c. After pressure testing, user shall operate the
valve again about 3 times to ensure the
function.
7. Dangers of inappropriate use
a. Never uses the product exceed its allowed
condition, such as pressure, temperature and
fluid.
b. If the product has any inappropriate use, the
product was damage however there are no
signals occurs immediately. User shall
change the product to avoid danger in the
future.
8. Maintenance
a. Maintenance frequency
The maintenance frequency is determined
upon the application. User shall consider the
time interval depend on the kinds of fluid,
flow velocity, operation frequency,
high-pressure effect and high-temperature
effect etc.
b. Adjustment of the Gland
Tighten the gland nut about ¼ turn
periodically to compensate for the wear
caused by movement between stem and
stem packing.
c. Emergency repair
When leakage occurs at the pipe connection
flange, tight the bolts of the flange end caps,
the force must distribute on the every single
bolt evenly. The order to tight the bolts need
to be symmetrically. For long-term purpose, it
is need to be re-installed with new seal.
d. Disassembly
(NOTE If complete disassembly is necessary,
replacement of all seats and seals is recommended.)
(1) To dismantle the valve must follow the
procedure below.
(2) It doesn’t matter where the position of
valve located is; usually it contained the
seal up fluid, so operator must be very
carefully when moving the valve on the
pipe. It must open the ball a little and let
the fluid come out slowly, it also need to
watch out the poisonous and inflammability
objects if there is any.
(3) It must turn the ball in the close position
before dismantle the valve. The ball
cannot be taken out from valve body if the
ball is in the open or semi-open position.
The right position for store the valve is put
the flange end on the ground. If it is a
valve with the hand wheel, than it must
dismantle the hand
first than put the valve flange end on the
ground. This procedure is protecting the
surface of the ball.
(4) To dismantle the valve body and end cap,
release retainer with a special tool. It
must be careful to dismantle the ball to
wheel from the valve
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avoid the seat retainer fall down from end
cap.
(5) To lift the ball by hoist, it must make the
protection on corner to avoid the ball
damaged by metal contacted.
e. Parts inspection, maintenance, and
replacement:
(1) Check the surface of ball if it is scraped
use the PT for inspection if necessary. If
there is any damage on the surface, then find
out the root cause such as the dirt fluid…etc.
avoid the damage factors as far as possible as
we can .
(2) The damage of the ball surface, to gauge if it
is locate on the contacting area of ball and ball
seat. If it is the case, then the ball must take
a fine milling. If it cause a heavy damaged,
then it must welded and re-machined. If it
cannot be repaired then change a new ball.
(3) If the scraped area is not at the location
described in the item (2)above, then it must
re-fine milling the damage area again.
Otherwise, the ball will damage the soft seat
during the open and close operation or it will
dig out the ball seat and cause a heavy
damage to ball and seat.
(4) Check the thickness of valve body and cap.
As defined in section 1. the body and cap
material may wear be cause of the status of
fluid.User should decide the frequency for
checking thickness.
(5) To inspect the surface of soft seat, if there is it
any scrap mark, concave, dust (including weld
dregs, iron bit, sands…etc.), abrasion,
abnormal press scrape, and a tiny scrap.
Usually, the scrape mark and damage by dust
will occur in the same time with ball damage.
It is the root cause for leakage. If the
leakage occurs before the repairing, then this
is suggest to change a new soft seat (PTFE or
RTFE). The mark from press or fine scrap
happen in an abnormal operation pressure.
It must be reconsidered to choice a right
valve.
(6) To check the worm gear if it can be operated
correctly, the operated correctly means people
can use one finger to turn the wheel. when
the torque higher then 25KG-M, if must open
the gear- box and check the connection of the
tooth of gear. To check has there is any
grease, spoiled grease, water, oxidation or
dust in the box.
(7) Worm gear operator has a switch of
open/close indicator get back to the original
location after dismantle or assembly. It must
do the pressure inspection before install onto
pipe line, otherwise, it will become very difficult
to do adjustment on the pipe line.The stem
packing must be replaced by new parts after
dismantle the valve. Its material has PTFE,
Graphite and Carbon Fiber. The material of
new packing must be the same as the old one.
To tight the gland nut, it must pass the 1.5
times water pressure test without leakage.
Do not make the gland nut too tight to avoid
the higher torque.
(8) To do the final inspection for a valve, 10
times of open and close operating must be
done to ensure all the parts are assembled
correctly. To ensure the torque is in a same
value during the open/close operation. If the
torque is not the same in operation, then there
may has some parts in an correct position or
interference.please dismantle and re-assembly.
Otherwise, the valve will get damaged easily
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when working on pipeline under higher
pressure .
f. Assembly
For assembly process, it takes the opposite
way of dismantle process. The must in the
close position during assembling the body
and end cap, the stopper must be located at
the right place; otherwise, the open and
close operation will be opposite.
9. Corrosion Data
CF8M,1.4408,SS316 Stainless steel is suitable
for the general
Application of corrosion , but below conditions
shall be concerned:
a. HCL in humid or high temperature is more
corrosive, wet HCL is more corrosive than
dry HCL under 700ºF, while the corrosive,
wet HCL and dry HCL are almost the same
above 700ºF. the max. tolerance for dry
HCL and HCI is 320ºC
b. Hydrofluoric acid corrosion easy cause
corrosion.
c. Phosphoric acid under 65ºCis applicable in
any thickness. And so is the boiling
Phosphoric acid in 40%
d. H2SO4 in normal temperature the thickness
under 20% or above 85% are applicable,
but the thickness between 20% and 85%
are not. Under 50ºCthe thickness must be
under 10%, when reach boiling point the
thickness should be under 1%.
e. HCI under 2% in low temperature.
f. Used in seawater minimum content should
be more than 2.75%
10. Use in potential explosive atmosphere
areas
a. Maximum surface temperature
It is depends on the heated fluid inside the
valve. The limitation of the application
temperature is marked on the label. There is
no additional temperature raise cause by
normal operation and expected malfunction.
b. Electro static charges
The only non-conductive part of the
equipment is the plastic handle grip. The
surface resistance of the material does not
exceed 1GΩ at (23 2) C and (50 5)%
relative humidity. The equipment also
designed and constructed with an electrical
continuity design between ball, stem and
body. Any occurrence of efficient electro
static charge will be earthed through the pipe
line earthing.
c. Containing light metals
Materials used in the construction of external
parts do not contain light metals more than
7.5% of magnesium.
d. Equipment was tested in factory according to
high pressure leakage test before delivery. It
will not release flammable gases to explosive
atmosphere outside the equipment.
e. The internal parts, such as seals and packing
can be adversely affected by some solvents.
List of solvents which are known to be
compatible with the seal and packing
material are provided in the corrosion data
information.
f. The equipment also conforms to Pressure
Equipment Directive (97/23/EC), The
mechanical strength of the structure can
withstand the hazard cause by internal
pressure.
11. Marking
Mfg logo: MD
Mfg location: TAICHUNG, Taiwan
Mfg year: 2009
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CE mark: CE for DN 25 and smaller
CE
Max. working pressure:
For CLASS 300: 49.7 bar at -20°C,
ATEX mark
II2DGc:
T.F ref. No. ATEX-TF-0701: Technical file
Other identification such as DN (size in mm),
Group II, category 2 equipment,
Dust & Gas application,
Constructional safety according to
EN 13463-5:2003.
reference number provided by ATEX
certification body.
Shell Material (1.4408 or 1.4308 or
1.0619), PN (bar), Heat number are
marked on the shell respectively.
for DN 32 and larger
0035
35.8 bar at 180°C
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