MASCOT VFlo Скачать руководство пользователя страница 5

Страница: 5 / 8

VFlo Control Valves

Rotate the ball inside the body in a way so that the non-
splined end of the ball is toward the back port of the valve.
Remove the ball straight out of the body. If needed, on
stationary post designs remove the post bear-ing from the ball
by pushing it out with a press.

CAUTION :

The sealing surface of the ball should not be

galled or scratched when re-moving it from body. Scratches

lead to excessive leakage and wearing of the seal.

Employing a bronze dowel with the appropriate diameter,
push the packing and bearings out of the body. The packing
must be pushed out of the body from the center of the valve.
(Refer Table IV for optional shaft/post bearing tool.)

Reassembling the Body

For the reassembling of the body subassembly, refer to Figures 1
or 2, 3, 4, and 5 and proceed as mentioned below :

All parts must be cleaned and all O-rings and soft seals must
be replaced.
The ball sealing surface must be smooth and free of scratches
and scoring.

CAUTION :

Keep the seal surfaces clean and free of

damage. Damaged or dirty surfaces cause excessive seat

wear and high torque re-quirements.Prompt replacement of

damaged balls should be done.

The shaft and post are to be inspected for galled surfaces or
scratches. To achieve optimum performance, VFlo shafts and
posts are given a very smooth finish. Replace the shaft or
contact the factory representative if damage exists.

NOTE :

Replacing the ball does not require replacing the shaft as

ball and shaft are interchangeable.

We recommended the use of a press to install new bear-ings
in the body and/or ball. (If needed, an optional post/
bear-ing tool is available from the factory. Refer Table IV.) The
ends of the body bear-ings should be flush with the inside of
the body - an indication of correct installation.

The ball is to be position in the body by lowering it, splined
hole first, into the back of the body. Rotate the ball surface
toward the front of the body so that the splined hole is
towards the packing box

CAUTION : Whilst, Replacing it in body be extremely
careful not to scratch or gall the sealing surface of the ball.
Scratches may cause excessive leakage and wearing of
seal

For  3  through  12-inch  designs,  the  shaft  is  to  be  inserted
through  the  outboard  end  of  the  body  and  through  the
splined inch designs, insert the shaft through the inboard end
of body and through the packing box into the splined hole of
the ball. (For 1 -inch body designs, before installing the shaft,
the  thrust  bearing,  packing  spacer,  packing,  and  packing
follower must be inserted.)
The positioning of the shaft is to be such that the pin hole in
the  shaft  and  ball  are  in  alignment.  (Certain  shafts  have  a
half circle mark and line on the end. Align the line mark with
the pin and the half circle symbol with the ball.) The shaft pin
needs to be installed and driven firmly into place so that half
in the shaft and half is in the ball.

On rotating post designs,

the post is to be inserted through

the outboard end of the body and into the hole of the ball.
(For  1  through  2-inch  valves  sizes,  before  installing  post,
insert thrust bearing.) The post must be positioned so that the
pin hole in the post and ball are aligned. (For 6 through 12-
inch valve sizes, make certain that the ball pin hole is aligned
with  the  smallest  diameter  pin  hole  in  the  post.  Some  posts
have  a  half  circle  mark  on  the  end.  This  half  circle  mark
needs  to  be  aligned  with  the  ball.)  The  post  pin  is  to  be
installed and driven firmly into place so that half is in the post
and half is in the ball. To torque the plug, refer Table Il.