Azbil VDD Series Manuel utilisateur

OM2-8110-0530

Weir Diaphragm Control Valve

Model VDD_ _ _

User’s Manual

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.

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

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

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 buttery valve fully closed.

Scratches

Dust, sand,

etc.

Tighten evenly in a

diagonal pattern.

Max. weight

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

pressure No

pressure

Packing

Gasket

Follow the assembly procedure

Replace the packing and gasket

Tighten bolts to specied torque

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