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A699VB Valve

Operation and Maintenance Instruction Manual

670M

Operation/Caution

The A699VB Series Valve has a soft seat seal.

Note: While this type of valve seals very

easily, they also have a tendency to be

“overtightened” when closing during

operation.

CAUTION: “Overtightening” will cause the

20VBHA Valve Seat to extrude into the valve

body, pinching off the oriﬁce of the 20VBHA

Valve Seat. This may reduce ﬂow through the

valve and the 20VBHA Valve Seat may need to

be replaced.

Dissasembly of the A699VB Series Valve

1. Fully open the valve by turning the bar

handle counter clockwise.

2. Loosen the packing nut by turning it counter

clockwise in relation to the valve body until

it’s threads are clear of the valve body.

3. Pull the handle, needle, and packing nut out

of the valve body together.

4. Remove the washer.

5. Remove the (2) PTFE packing or (1) Grafoil

packing. Inspect these parts for wear and

replace if necessary.

6. Remove the lantern ring.

7. Remove the valve seat and discard.

Assembly of the A699VB Series Valve

1. Before assembly, all parts should be clean

and in good condition.

2. Install the new valve seat into the valve

body.

3. Install the lantern ring.

4. Install the packing.

5. Install the washer.

6. Apply a small amount of molylube (Parr part

number 424HC) to the internal and external

threads of the packing nut.

7. With the valve needle still in the fully open

position, (threaded fully into the packing

nut) hand tighten the handle, needle, and

packing nut into the valve body.

8. When the packing nut has been installed

ﬁnger tight, tighten the packing nut with a

wrench an additional “three wrench ﬂats”

(1/2 turn) to pre-load the packing.

9. Again note when closing, the valve should

not be overtightened.

Parr Instrument Company www.parrinst.com

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A699VB Valve Operation and Maintenance Instruction Manual670MOperation/CautionThe A699VB Series Valve has a soft seat seal.Note: While this type of v

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A699VB Valve Parr Instrument Company 211 53rd Street • Moline, Illinois 61265 USA 1-309-762-7716 • 1-800-872-7720 • Fax: 1-309-762-9453 E-mail: parr@p

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Parr-instrument A699VB Manual do Utilizador

Consulte online ou descarregue Manual do Utilizador para Instrumentos de medida Parr-instrument A699VB. Parr Instrument A699VB User Manual Manual do Utilizador

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