Emerson Keystone Figure 221 Series Manuale utente

DANGEROUS PRACTICES

Potentially dangerous practices:

• disregarding instructions

• improper use of product

• use of insufficiently qualified personnel.

Application pressure/temperature must not be

higher than the pressure/temperature limits

shown on the technical data sheet.

Before installation these instructions must be fully read and understood

KEYSTONE FIGURE 221/222 BUTTERFLY VALVES

INSTALLATION AND MAINTENANCE INSTRUCTIONS

INTRODUCTION

The Keystone Figure 221/222 is a rubber lined

butterfly valve which has a maximum working

pressure of 16 bar over a temperature range of

-29°C to +120°C, depending on seat material.

The Figure 221/222 utilizes a molded seat

design.

SAFETY RELATED INFORMATION

1. If in any doubt regarding any aspect of

Figure 221/222 valves, contact your local

Emerson sales office for guidance.

2. Only use properly qualified personnel for

installation.

3. Ensure that the pipeline is fully drained

or vented before removing the valve from

thepipeline.

4. Use appropriate protective equipment/

clothing, such as goggles, safety shoes,

industrial gloves.

5. This product is not intended for use in areas

where external fire is a potential hazard.

6. The piping design must take into account

the following factors and any other factors

which are not listed here, but known

to be relevant to the safe operation of

theinstallation.

6.1 Valve weights which are shown in

thetechnical data sheet.

6.2 Formation of condensate in gas

pipelines.

6.3 Elimination of turbulence and vortex

potential at the valve.

6.4 Pipeline vibrations.

6.5 The piping design should preclude

theoccurrence of water hammer at

thevalve.

7. The valve design has not taken into account

earthquake loading or traffic vibration.

8. The normal shelf life of the Figure 221/222

valve seat is 5 years under clean, dry

ambient and conditions without UV exposure

prior to installation.

9. Tighten all flange bolts as per the

nominated flange standards using the

diagonal sequence method.

FLANGE AND PIPELINE COMPATIBILITY

Keystone butterfly valves are designed for

installation between ANSI Class 125/150 flat or

raised faced flanges. Gaskets are not required.

Lined pipe, heavy wall pipe or flanges must

have a minimum allowable inside diameter at

the centered body face to clear the disc sealing

edge when opening the valve.

Weld neck flanges (flange ID approximates

flange bore) are recommended to ensure

maximum valve performance; however, slip-on

flanges may be used.

Do not weld near the valve, as this will result in

serious damage to the valve.

KEYSTONE FIGURE 221/222 BUTTERFLY VALVES

INSTALLATION AND MAINTENANCE INSTRUCTIONS

INSTALLATION INSTRUCTIONS

Installation in pipeline

Figure 221/222 valves are bi-directional and

there is no need to identify upstream and

down stream orientation. These valves can be

installed in vertical or horizontal pipelines and

any intermediate orientation.

There is no restriction on the valve stem

position (vertical, horizontal or oblique),

although for slurry service and media, which

have a tendency to deposit sediment, the

recommended installation position is with

the stem horizontal and the lower disc edge

opening downstream.

Do not use flange gaskets or sealing

compounds. The Keystone seat face design

eliminates the need for gaskets.

MAINTENANCE

Routine maintenance or lubrication are not

required.

INSTALLATION IN AN EXISTING SYSTEM

1. Consideration should be given to the

location of the valves in the piping

system. The valve should not be placed

too close to other valves, elbows, etc.

as its performance may be affected.

Itis recommended that the valve have a

minimum of six pipe diameters upstream

and four pipe diameters downstream

between it and other valves, elbows, etc.

inthe piping system.

2. Ensure that the flanges are clean,

undamaged and compatible with the valve.

3. Check that the gap between the flanges

can accommodate the valve face to face

dimension.

4. Spread the flanges using suitable tooling

such as flange spreaders to enable ease of

insertion of the valve between the flanges.

WARNING

Do not use the valve as a lever.

5. Open the valve until the disc is free of

the seat but still within the valve body

(about 5° open).

6. Loosely insert two or more flange bolts

through the holes in the lower part of the

flanges to help support the valve.

7. Carefully slide the valve between the

flanges, center the valve body with the

pipeline axis, and insert the remaining

flange bolts.

8. Open the valve fully, checking that the disc

edge does not interfere with the pipeline

bore.

9. Remove any flange spreaders that

have been used and at the same time

tighten the flange bolts “hand tight”.

Ensurethatthe valve remains centered

to the pipeline axis by slowly closing the

valve (clockwiserotation of the disc stem)

to check that adequate clearance has been

maintained between the disc edge and the

pipeline bore.

10. Re-open the valve (counter clockwise

rotation of the disc stem) and tighten all

flange bolts as per flange standards using

the diagonal sequence method.

11. Operate the valve to the desired position.

OpenFlow

EXISTING SYSTEM

1. Spread the flanges with the adequate

tooling. Insert some flange bolts to bear

the valve

2. Open the valve and remove the flange

spreads.

3. Close the valve clockwise, return to open

position and cross-tighten all bolting.

Preferred mounting

KEYSTONE FIGURE 221/222 BUTTERFLY VALVES

INSTALLATION AND MAINTENANCE INSTRUCTIONS

INSTALLATION IN A NEW SYSTEM

It is common practice to use the valve to help

in alignment of the flanges prior to welding the

flanges into the pipeline. In such cases, the

following instruction applies:

1. Align both mating flanges with the valve

center line and secure in position using the

flange bolts.

2. Position the flange/valve/flange assembly in

the pipeline.

3. Tack weld the flanges to the pipeline.

4. Remove the flange bolts and the valve.

5. Finish weld the flanges to the pipeline and

allow to cool fully.

6. Follow the procedure for installation in an

existing system.

WARNING

Do not finish weld the flanges to the pipeline with

the valve still assembled to the flanges as this will

result in serious damage to the valve seat.

NEW SYSTEM

1. Center a flange-valve-flange assembly

between the pipes.

2. Tack weld the flanges to the pipes.

3. Remove the valve and finish weld.

Installthe valve according to the procedure

in the left column.

KEYSTONE FIGURE 221/222 BUTTERFLY VALVES

INSTALLATION AND MAINTENANCE INSTRUCTIONS

TROUBLESHOOTING

Symptom Probable cause Solution

Valve opens only a few degrees and stops

(itwill not open to the full angle desired)

Improper installation. The valve is improperly aligned Loosen the flange bolts, re-align the valve with flanges, and

re-tighten the flange bolts to correct torque per ANSI requirements

Leakage past the flange face 1. Flange bolts are not evenly torqued

2. Improper flanges

1. Loosen the flange bolts and tighten the flange bolts to the correct

torque per ANSI requirements

2. Refer to “Flange and pipeline compatibility” on page 1

Leakage in the closed position

(leakage in the pipeline)

The disc is not closing fully:

1. Actuator is not properly adjusted

Line pressure exceeds the valve’s working pressure

1. Refer to actuator adjustment procedures

2. Reduce line pressure to the valve’s working pressure

Excessively high torque 1. Obstruction in the pipeline

2. Scale build-up on stem or seat

1. Remove valve from pipeline and remove obstruction

3. Open and close the valve several times. Operate the valve at least

once a month. Check the valve seat for deterioration

Neither Emerson, Emerson Automation Solutions, nor any of their affiliated entities assumes responsibility for the selection, use or maintenance of any product.

Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user.

Keystone is a mark owned by one of the companies in the Emerson Automation Solutions business unit of Emerson Electric Co. Emerson Automation Solutions, Emerson

and the Emerson logo are trademarks and service marks of Emerson Electric Co. All other marks are the property of their respective owners.

The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be

construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are governed by

our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of such products at any time without

notice.

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