Azbil AGVB Manuale utente

Top-Guided Single-Seated Control ValveTop-Guided Single-Seated Control Valve

Model AGVB/AGVMModel AGVB/AGVM

User’s ManualUser’s Manual

CM2-AGV200-2001

NOTICE

While the information in this manual is presented in good faith and

believed to be accurate, Azbil Corporation disclaims any implied

warranty of merchantability or fitness for a particular purpose and

makes no express warranty except as may be stated in its written

agreement with and for its customer.

In no event shall Azbil Corporation be liable to anyone for any indirect,

special or consequential damages. is information and specications

in this document are subject to change without notice.

Introduction

Thank you for purchasing Azbil’s model AGVB / AGVM top-guided single-seated control

valve. This device is a compact, high-performance single-seated control valve. It consists of

a valve body with excellent flow efficiency and a multi-spring actuator. With the improved

leakage performance of the valve seat, instrumentation costs can be reduced significantly.

Azbil is proud to provide high reliability and quality based on its abundant achievements and

know-how in the field.

This user’s manual describes how to use this device safely and reliably. Be sure to read this

manual before using the product. After reading the manual, be sure to keep it in a place where

users can refer to it at any time.

Unpacking and Storing the Product

 Unpacking

This device is a precision instrument. Take special care in handling it to prevent accidents,

damage, etc.

When unpacking, check that the following items are included:

• The valve, actuator, and parts to be mounted

• Any auxiliary devices that you ordered

 Checking the Specifications

Check that the fluid conditions, valve number (tag No.), and the specifications printed on the

name plate are correct and appropriate. The location of the product's nameplate is shown in

the figure below.

Nameplate

Position of the nameplate

 Inquiries

For inquiries about this device, please contact us. When making an inquiry, have your model

number and product number ready.

 Precautions for Storage

Observe the following precautions in order to store the purchased valve properly.

• If the valve is packed in a cardboard box, store it indoors at room temperature and humidity.

• A valve packed in a wooden crate should also generally be stored indoors at room

temperature and humidity. For outdoor storage, after unpacking the valve and checking the

specifications, cover it with a polyethylene protective sheet to keep rainwater out.

To store a valve that has been used, follow the instructions below.

1. Wash out any fluid stuck to or remaining in the interior of the valve.

2. If it is likely that the valve will corrode, take preventive measures.

3. Cover the openings for air supply and electrical conduit connections with waterproof caps

or tape to keep water out. In addition, protect the threads on the connectors.

4. Protect the ends of piping connections (flanges, welded surfaces) using flange caps or the

like.

5. Store the product in a location that is subject to minimal vibration and shock.

Safety Precautions

 Symbols

Safety precautions are for ensuring the safe and correct use of this product, and for preventing injury to the operator

and other people or damage to property. Be sure to observe these safety precautions.

The safety precautions described in this manual are indicated by various icons.

Their meaning is explained below. Be sure to understand the meaning before reading the rest of the manual.

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.

 Examples

Indicates that caution is required in handling.

The indicated action is prohibited.

Be sure to follow the indicated instructions.

iii

Notes 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.

Handling Precautions

 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 passersby, 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.

CAUTION

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.

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

Dust,

sand, etc.

Scratch

Tightening in

a diagonal pattern

Install the buttery valve

fully closed

vii

 Precautions for Air Supply Piping and Electrical Work

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

2 threads

Sealing tape

Liquid leakage

viii

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