Flomatic Flo-Flex 745 Руководство - Страница 5

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Note: The Valve Cover bolts should be tightened to the specifications shown in Table 2

below during re-assembly.

WARNING: Do not use threaded holes in cover for lifting the valve.

Serious injury may result.

BACKFLUSH DEVICE (Model 745 BF)

FIELD INSTALLATION AND MAINTENANCE (OPTIONAL)

FIG. 3

Item #

Qty.

Description

Bushing

Brass

Shaft

Stainless Steel

Shaft Wiper*

Molythane

O-Ring*

Buna

Handle

Stainless Steel

Jam Nut

Brass

Handle Cap

Vinyl

*Recommended Spare Parts

3. Inspect the back-flush device and place in the non-extended position. (The stainless steel shaft should extend a

maximum 1" past the end of the brass bushing.) Apply Teflon thread sealant to brass threads.

4. Insert the threaded end of the assembly into the valve boss. Slowly turn the assembly into the boss taking care not to

cross-thread the bushing. Continue turning the assembly into the valve for a tight fit.

BACKFLUSH DEVICE (Model 745BF) SEAL REPLACEMENT:

There are two parts (8 & 9) on the backflow actuator that are subject to normal wear. To replace the seals, the

pipeline must first be depressurized and drained. Next, remove the backflow assembly from the valve by turning

the brass bushing (6) counter-clockwise. Disassemble the actuator as follows:

1. Remove one of the vinyl caps (12).

2. Remove the T-Handle (10) and jam nut (11) from the rod (7).

3. Remove the rod (7) from the bushing (6) by screwing in the rod fully clockwise and pull the rod through the

valve end of the bushing (6).

4. Lubricate new seals with FDA approved grease such as "Super Lube" and install in the bushing end grooves.

5. Clean, lubricate, and reinstall rod in bushing.

6. Re-install jam nut (11) and T-Handle (10).

7. Place vinyl cap (12) on handle (10).

8. Apply Teflon thread sealant to bushing and carefully thread into valve taking care not to cross-thread the

bushing

BACKFLUSH DEVICE OPERATION:

The optional backflush device assembly (see Fig. 3)

is normally factory installed but is also available for field

installation. The backflush device assembly works like a screw jack but is not designed

to operate during the valve's Maximum Working Pressure rating. This could damage the

rubber coated valve disc. Therefore, prior to using the backflush device close the

pump isolation valve and bleed off any high line pressure. To operate, turn the

backflush device handle clockwise to move valve disc to and "open" position. This will

allow backflow through the valve. The backflush device handle should turn easily.

When resistance is felt, the disc has reached its "stop" and is in the full "open" valve disc

position. Upon completion of the back flushing operation, turn the handle counter-

clockwise and the valve disc will automatically return to the "closed" position. It is

important to lock the backflush device handle in the valve disc "closed" position with

the jam nut provided. The system is again ready for normal operation.

WARNING: If the backflush device stem is not fully turn back to a valve disc

"closed" position the back-flush device shaft/stem could damage the valve disc and

prevent the valve from sealing when put into operation.

BACKFLUSH FIELD INSTALLATION:

Material

When the backflush device is supplied separately and as an optional assembly from

the factory install as follow:

1. Relief the pipe line pressure and drain the pipeline.

2. Carefully, remove the pipe plug (located on the bottom boss of the valve) to insure

that there is no pressure in the line.

Flomatic Corp, 15 Pruyn's Island, Glens Falls, New York 12801

Phone: 518-761-9797

Fax: 518-761-9798

www.flomatic.com

Valve Cover Bolt Max Torque

Valve Size

Bolt Diameter

Torque

(inches)

(ft.-lbs.)

½"

2-1/2

½"

⅝"

100

⅝"

150

⅝"

150

¾"

250

¾"

250

¾"

250

500

Table 2

745PI-BF-LS-ASC Rev. B

October 12, 2018