Flo-Tite F300 Installatie, bediening en onderhoud - Pagina 2

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Flo-Tite, Inc.

Valves & Controls

DISASSEMBLY FOR SEAL & PACKING

Stem seal leakage may be corrected without disassembly. Tighten the packing gland nuts until leakage

stops. If leakage continues or valve's operating torque becomes excessive, the seals are worn and replace-

ment will be necessary. WARNING: do not remove packing gland while line is under pressure! Begin

with the valve partially open in a depressurized line.

1. Remove the flange bolts and nuts and lift valve from line for

taken to avoid scratching or damaging serrated gasket. These valves can be heavy depending on what

size you are repairing. They should be adequately supported before removal from the line has begun.

2. Loosen handle set screw and remove handle and stop plate. Next, remove gland nuts, gland flange and

gland.

3. Remove body end nuts, using proper wrench size. Lift off body end. One seat should come out with

body end.

4. Remove body seal.

5. To take out the ball, rotate stem so ball is in fully closed position. Lift ball from body, using a strap and

lift device, if necessary. NOTE: extreme caution should be taken to avoid damage to the ball.

6. Take out the other seat.

7. Stem must be removed from inside the body. (tap on the top of stem with rubber coated tool should

loosen it. The thrust washer should come out with the stem. Then remove the stem packing.)

VISUAL INSPECTION

Clean and inspect metal parts. It is not necessary to replace the ball and stem unless the seating surfaces

have been damaged by abrasion or corrosion. We strongly recommend replacement of all soft parts when-

ever the valve is disassembled for reconditioning. This is the surest protection against subsequent leakage

after valve assembly. The replacement parts can be ordered in kit form. NOTE: the valve may be assem-

bled and operated dry where no lubricants are allowed in the system; however, a light lubricant or mating

parts will aid in assembly and reduce initial opening torque. Lubricant used must be compatible with the

intended line fluid.

ASSEMBLY

Install one seat in the body cavity with the spherical curvature facing the ball. Install thrust washer on stem

and slide the stem up through the body. Install packing and packing gland with packing gland bolts. Install

stop plate, handle and handle retainer nut. Turn the handle to the CLOSED position. Line up the ball slot

with stem tang and slide the ball into position. Turn the handle to the OPEN position to hold the ball in

place. Install the remaining seat into body side. Put body seal gasket into shoulder counter-bore at flange

in valve body. Put body end back into body and line up end flange. Because the body flange bolt pattern is

different from the line flange bolt pattern, it is possible to assemble the valve such that the bolt holes in the

line flanges don't line up. Be certain to align end flanges bolt holes to straddle valve center lines. NOTE:

be careful not to damage body seal when putting body end into body. Install body end nuts and tighten in a

"star" pattern to the torque specified below. WARNING: extreme care must be exercised during adjustment

of body end nuts to make sure that complete engagement of studs with body flange is maintained. There

should be at least one stud thread exposed on each side. Cycle the valve slowly, with a gentle back and

forth motion to build gradually to a full quarter turn. By cycling slowly, the seat lips will assume a perma-

nent seal shape against the ball. A fast turning motion, at this point, may cut the seats before they have a

chance to form the proper seal. Test valve, if possible, prior to placing valve back into line position.

Installation, Operation, & Maintenance

F150 & F300 2-Piece Ball Valves

servicing. NOTE: care should be