Azbil VDD Series Manuel utilisateur
OM2-8110-0530
Weir Diaphragm Control Valve
Model VDD_ _ _
User’s Manual
Copyright, Notices and Trademarks
©1988-2022 Azbil Corporation. All Rights Reserved.
While this information is presented in good faith and believed to be accurate,
Azbil Corporation disclaims the implied warranties of merchantability and
fitness for a particular purpose and makes no express warranties except as
may be stated in its written agreement with and for its customer.
In no event is Azbil Corporation liable to anyone for any indirect, special
or consequential damages, The information and specifications in this
document are subject to change without notice.
i
The safety precautions explained below aim to prevent injury to you and others, and to prevent property damage.
WARNING Warnings are indicated when mishandling this product may
result in death or serious injury.
CAUTION Cautions are indicated when mishandling this product may
result in minor injury or property damage only.
In describing the product, this manual uses the icons and conventions listed below.
Indicates that caution is required in handling.
The indicated action is prohibited.
Be sure to follow the indicated instructions.
Conventions Used in This Manual
ii
Precautions for Safe Operation
WARNING
Before starting to work, check that the pressure in the pipes has dropped to atmospheric
pressure. If fluid spews out, injury may result.
CAUTION
Do not stand on the device or use it as a step. There is a risk of falling.
Do not touch the device unnecessarily while it is operating. Depending on the operating
conditions, the surface might be extremely hot or cold.
Since this product is heavy, when handling it, wear safety shoes and watch your step.
During work, wear protective goggles to prevent injury from flying objects and harm from
chemicals.
During work, wear protective gloves to prevent injury from burrs on bolt heads or edges and
harm from chemicals.
While this device is operating, do not touch movable parts such as the stem connector.
Your hand, etc., may be caught in the mechanism and be injured.
When assembling or disassembling the diaphragm, which is part of the actuator, wear
protective gloves to prevent prolonged contact with your skin. “Prolonged contact” refers to
total daily skin contact of 10 minutes continuously or 30 minutes intermittently.
iii
Installation Precautions
WARNING
If the rated pressure or standards for connection are ignored when this device is used,
damage to the product or leakage may cause a serious accident.
When connecting the valve to the piping, do not put your hand or foot under the valve or
between flanges. You may lose your fingers or your foot may be injured.
Before reinstalling the valve after maintenance or modification, wash out any residual fluid in
the pipes or replace it with a safe fluid. Otherwise, the residual fluid may cause an injury.
CAUTION
Make sure that there is a straight pipe section at least 10 times the pipe diameter on the
upstream side and 6 times the pipe diameter on the downstream side (D: nominal diameter).
If the straight pipe sections are not long enough, insufficient valve capacity or unusual noise
or vibration could result.
Install the valve in the correct direction, leaving clearance around the valve as much as
possible for easy maintenance (piping, wiring, adjustment, etc.).
Provide appropriate support for the valve itself and for connected pipes to prevent an
excessive load from the weight and operation of the valve. (Care is needed especially for large
valves and valves for low-temperature fluid.)
If the valve is installed along a passageway used by outsiders, install a fence or cover as a
protective measure.
Do not install the valve where it may be submerged by rainwater, covered with snow, or
subject to freezing. Otherwise the valve might be damaged.
If the valve is exposed to radiant heat, provide a shielding plate or the like. Failure to do so
may result in damage to the actuator or auxiliary equipment.
If the valve is exposed to salt or a corrosive atmosphere, take measures against corrosion.
Otherwise the valve might be damaged.
Check that there is no damage to the valve (including the actuator and auxiliary equipment).
Check that there is no damage to the flanges or welded piping.
Otherwise fluid leakage could result.
If pipe flanges connected to the valve are being welded, the valve surface may also heat up.
Do not touch the valve unnecessarily.
Chamfer the edges of the pipe flanges. Sharp edges can cause an injury.
Check that the pipes on both sides of the valve are firmly supported. Insufficient support may
cause leakage from pipe connections.
After installation, check that the pipes are still properly aligned. Misalignment may cause
fluid leakage from pipe connections.
Install the butterfly valve with the valve (blade or disk) fully closed. Otherwise the valve
might be damaged.
If the eyebolts (eyenuts) attached to the actuator are used to hoist the valve, make sure that
the weight does not exceed the limit specified in the user’s manual. An excessive load may
damage the actuator or cause air leakage.
Handling Precautions
iv
CAUTION
Use bolts and nuts that conform to the standards for the pipe flange. Otherwise fluid leakage
could result.
Use new flange gaskets that are appropriate for the properties of the fluid, the operating
temperature, and the pressure. Damaged gaskets may cause fluid leakage.
Open the valve fully before flushing the inside of the piping, and do not change the valve
travel while the pipes are being flushed. Otherwise, the valve may be damaged by welding
spatter or other foreign matter.
When keeping the valve warm or cold, also keep the stud bolts and nuts that connect the
valve and the bonnet warm or cold. Otherwise, fluid leakage due to thermal deformation may
occur.
Handling Precautions
• Avoid installing the valve where it will be subject to vibration or other external
forces that may affect its performance.
• Protective covers are attached to the flanges to protect the gasket-contacting
surfaces and to prevent foreign matter from entering the valve. When
installing the valve, remove the covers.
• Check that there is no damage to the valve (including the actuator and
auxiliary equipment).
• To prevent seat damage and impaired closing performance, remove foreign
matter such as dust, sand, and welding spatter from the inside of the piping,
and clean the inside of the valve.
• Check that the distance between the pipe flanges is equal to the total of the
face-to-face length of the valve and the thickness of the gaskets.
• Tighten the bolts and nuts for the flanges evenly in a diagonal pattern.
Space for maintenance
Pipe support
Install the buttery valve fully closed.
Scratches
Dust, sand,
etc.
v
Tighten evenly in a
diagonal pattern.
Max. weight
vi
CAUTION
For air supply, use pipes with an appropriate internal diameter so that pressure will not drop
while the valve is operating. Failure to do so may result in poor valve performance.
Wiring work should be carried out only by qualified technicians following local
electrotechnical standards.
Cabling should be carried out in accordance with facility conditions. Use an adapter (and
packing) whose size is appropriate for the outer diameter of the cable.
If sealing tape is applied to air supply pipe threads, leave the two threads nearest the tip
bare. Clogging caused by pieces of tape may result in poor valve performance.
If liquid packing (thread lock sealant) is used for air supply piping work, do not allow it to
enter inside the pipes. If it does, poor valve performance may result.
Avoid doing wiring work on a rainy day or in high humidity. Moisture inside connectors or the
terminal box may cause a short-circuit or rust.
Handling Precautions
• A packing (gasket) is attached to the cap of auxiliary equipment such as
positioners.
Do not lose it during wiring work.
• If it is necessary to bend the air supply pipes, make gentle bends (using a
dedicated tool like a tube bender), and use a band to hold parallel pipes
together.
Positioner
Sealing tape
Liquid leakage
2 threads
Precautions for Air Supply Piping and Electrical Work
vii
WARNING
Before starting work, clean the inside of the valve, replace any residual gas, etc. Otherwise,
the residual fluid may cause an injury.
Do not disassemble the pneumatic actuator while supply air pressure is being applied. The
compressed air may cause an injury.
Because damaged or corroded bolts and nuts may damage the valve and cause injury,
replace them with new ones.
CAUTION
Observe the tightening torques indicated in the user’s manual when tightening bolts and
nuts.
For an actuator that incorporates springs, follow the disassembly procedure when removing
bolts, nuts, etc.
Otherwise, the springs may jump out, causing injury.
When removing the valve from the piping, if the eyebolts (eyenuts) attached to the actuator
are used to hoist the valve, make sure that the weight does not exceed the limit specified in
the user’s manual. Otherwise, the valve may fall.
Before removing or attaching the trim (internal valve), check whether a dedicated tool is
necessary. If it is needed, be sure to use it. Otherwise, parts may be damaged.
Assemble the valve using the parts, bolts, nuts, etc., in the order stated in the assembly
procedure. Otherwise, malfunction may result.
When reassembling the valve body, always use new packing and gaskets. The reuse of old
parts will cause fluid leakage.
Hoist
Special tool
Eyebolt
Max. weight
Spring
Precautions for Assembly and Disassembly
viii
Close valve Close valve
Close Open
Valve Pressure
regulator
No
pressure No
pressure
Packing
Gasket
Follow the assembly procedure
Replace the packing and gasket
Tighten bolts to specied torque
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