Flo-Tite MPF155 Manual de instalação, operação e manutenção - Página 3

Procurar online ou descarregar pdf Manual de instalação, operação e manutenção para Unidade de controlo Flo-Tite MPF155. Flo-Tite MPF155 5 páginas. Flo-tite bottom entry series, flanged end ball valves

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D. Valve Disassembly-

WARNING

– Use extreme caution when removing the flanged valve from the pipeline to prevent

personal injury that may be caused by "cold springing" of the piping.

CAUTION

– valves shall be adequately supported prior to unfastening the studs and nuts that hold the valve

in line and secured with lifting straps or slings to hold the weight of the valve.

D1. Remove the flange bolts and nuts and lift the valve from the line for servicing. Note – care should be

taken to avoid scratching or damaging the flange gaskets. Damaged gaskets must be replaced prior to

reinstalling in the line.

D2. Safely place the valve on a clean, secure and stable work surface. Protect the flange faces when handling

to prevent scratching and damage.

D3. Match mark the body and body end to insure correct alignment when the valve is reassembled.

D4. Remove body cap. One body seal and seat should come out with the body end.

D5. The ball may be removed by first placing the valve in the fully closed position. Use a lifting strap and

lifting device for safety purposes when the weight of the ball dictates

CAUTION

– Use extreme care in handling the ball to avoid damage.

D6. Remove the second seat and seal.

D7. Remove Stem -

a.) 2" valves – Remove handle nut, handle, lock washer, Belleville washer, packing follower, packing protector,

stem packing, o-ring, packing protector and stem.

b.) 3 & 4" – Lose screw on handle and then remove handle, snap ring, travel stopper, gland bolt, stop housing,

housing bolt, packing gland, lock washer, Belleville follower, packing protector, stem packing, o-ring, thrust

washer and stem.

The stem must be removed from the inside of the body. Gently tap the top of the stem with a non-metallic

mallet. The thrust washer should come out with the stem. Stem packing can now be removed. If a packing

pick is used to remove packing, care must be taken not to scratch any surface.

Visual Inspection-

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

have been damaged by abrasion or corrosion. Flo-Tite strongly recommends that all seats, seals and packing

be replaced whenever a valve is disassembled for reconditioning. This is the surest protection against subse-

quent leakage after reassembly. Replacement parts are sold in kit form. Refer to the metal tag attached to the

side of the valve body to identify the specific sealing materials used. Kits can be obtained via the local Flo-

Tite Distributor. Replacement parts should be purchased prior to valve disassembly. Required information

to purchase replacement parts include:

Line size

Model designation

Seat/seal materials – see stamping on metal tag attached to the valve body.

Valve Reassembly -

Note- the valve may be reassembled and operated dry when no lubricants are allowed in the system;

however, a light lubricant on the ball and stem will aid in assembly or reduce initial operating torque.

Lubricant used must be compatible with the intended system fluid.

IOM-MPF155 2018

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