Flowserve 025000 Series - Manual (Page 7)

7
Flow Control Division
Kammer Control Valves
11.00
4.1.8 Check seal faces of seat ring and plug for damage.
Gasket surfaces of the upper and lower body parts,
seat ring and bonnet must be clean and free of dam-
age.
IMPORTANT: To prevent damage to the seat, plug,
or plug stem, follow the above instructions precisely.
4.1.9 If a sealing surface needs re-machining , seat and
plug seating surfaces must be reworked. The seat
angle on the plug is 30
°
, on the seat ring 25
°
. If the
valve is correctly assembled, lapping is not required.
Important: When re-machining the plug, protect plug
stem and bellows from damage and support upper
part of bellows towards plug stem. The seat sur-
face must be concentric to the plug stem. When re-
machining the seat, the seat surface must be con-
centric to the seat outer diameter.
4.2 Assemble Valve
(see Fig. 2)
4.2.1 All worn or damaged parts must be replaced. Reus-
able parts must be clean. Expendable parts such as
gaskets, packing and O-rings should always be re-
placed.
4.2.2 For soft seat version, insert new soft seat and as-
semble seat/plug.
4.2.3 Insert seat ring in lower body using new gaskets.
4.2.4 Position upper body carefully and absolutely straight
on lower body, and tighten retaining bolts alternating
crosswise finger-tight.
4.2.5 Insert lower bellows gasket.
4.2.6 Carefully insert bellows/stem assembly in the exten-
sion and install anti-rotation pin.
4.2.7 Insert upper bellows gasket.
4.2.8 Attach bellows seal bonnet (test connection towards
front) and uniformly tighten retaining bolts alternat-
ing crosswise finger-tight.
4.2.9 Place lower stem guide of packing set into packing
space, to provide better guidance for plug stem when
tightening halves of housing.
4.2.10 Tighten housing bolts uniformly alternating crosswise
hand-tight, moving plug stem to and fro several times
to check that plug is not jammed in seat.
4 DISASSEMBLE AND ASSEMBLE VALVE
4.1 Disassemble Valve
(see Fig. 2)
IMPORTANT: As poisonous or hazardous materials
may be present, the system must be depressurized
and all process materials drained. If necessary, de-
contaminate the valve. Keep hands, hair and cloth-
ing well away from moving parts. Wear face and
eye protectors. Failure to do so can lead to serious
injury.
4.1.1 Carefully loosen test connection and check whether
medium has collected in bellows seal bonnet (bel-
lows defective).
4.1.2 Remove bolts/nuts from bellows seal bonnet and re-
move bellows seal bonnet.
Note: Due to the friction coefficient of the packing,
the bellows/plug assembly usually also comes out
when the bonnet is removed. In this case, hold the
bellows to ensure that it does not drop and be dam-
aged.
4.1.3 If the bellows/plug assembly remains in the exten-
sion, it can be carefully levered out by inserting two
screwdrivers into the outer groove of the upper part
of the bellows.
4.1.4 Carefully remove bellows/plug assembly from the
extension without stretching bellows, and carefully
remove it absolutely upright from extension. Do not
lose anti-rotation pin. Press out guides, packing and
packing follower using a drift (the drift must have a
slightly larger diameter than the plug stem).
4.1.5 Remove body bolts and remove upper body.
4.1.6 Lift out seat ring using two screwdrivers inserted in
the outer groove of the seat.
4.1.7 If the plug is a soft seat version, loosen tip of plug
using suitable tool and remove soft seat.
IMPORTANT: When the tip of the plug is loosened,
medium residue may be released, which has dif-
fused through the gasket.
If the seat is a soft seat version, remove the soft seat
cover and then remove the soft seat.