DiskFlo Control Valves
5
Shaft needs to be inspected for galled surfaces or scratches.
The very smooth finish of the DiskFlo shafts give maximum
performance. In case of any damage, replace the shaft or
contact our factory representative.
NOTE :
In recent designs, Disc and shaft are interchangeable.
Replacing the disc does not require replacing the shaft. Older
designs needed that the disc and shaft be machined together.
For matched disc and shaft, contact the factory.
New sliding stem shaft bearings should be inserted into the
body. (With some designs, a press may be required.)
NOTE :
Previous DiskFlo designs need the disc to be aligned
in the body in such a way that it can properly rotate. After
aligning the shaft bearings on either side of the disc, insert the
shaft through the body, disc and bearings.
Making sure it will rotate in the proper direction with respect
to the body's internal disc stop, position the disc in the body.
insert the shaft through the body, disc and bearings.
CAUTION :
To avoid damage to both the shaft and
bearings, care needs to be taken while sliding the shaft
into the sliding stem shaft bearings.
New taper pins need to be inserted and driven firmly into
place in the side opposite the stop.
Over splined end of the shaft and into the body, slide the
packing retainer, lower packing, packing spacer, upper
packing, and packing follower. The typical packing
configurations are as in Figure 3.
NOTE :
Whenever rebuilding the packing box, use new
packing.
CAUTION :
As the sealing on V-ring packing is at the
feather edge, it is necessary to avoid damage to that edge.
Install the end plug again (alternatively replace the end seal
and again install the bolted flange).
The gland flange and packing nuts should be Reinstalled.
Packing to be tightened evenly to slightly over finger-tight
strength.
CAUTION :
Over tightening of packing should be avoided. This
causes excessive packing wear and high shaft friction, which may
hamper rotation of the shaft.
NOTE :
Orientation 1 is standard. Orientation positions 2 and 4 are
not available in some actuator sizes. Contact factory.
A gasket is required in all seat configurations with screw/clip
retainers (item #55) installed in the appropriate groove. This
is done by pressing the gasket into the appropriate groove.
In case the seat retainer is the screw/clip type and possesses
a soft or dual seat, press the soft seat into the soft seat
retainer or metal seat. (An interference between the soft seat
and the retainer is necessary.) Secure the retainer or metal
seat in place by tightening the retainer clips and screws, with
the valve in the closed position. This helps the seat to align
with the disc, making tight shutoff possible.
In case the seat retainer is the screw/clip type with a metal
seat design, a gasket needs to be installed in the metal seat
before clipping the seat in place with the screws and seat
clips.
NOTE :
DiskFlo valves of earlier design may require the disc to be
open while installing the soft seat into the body.
In case an early design DiskFlo seat retainer has an indexing
groove to accept a soft seat, press the corresponding seat
into the retainer groove. Install the seat retainer subassembly
into the body.
For valves supplied with the retainer snapring configuration,
the snapring needs to be installed into the groove around the
retainer (or metal seat). With the open ends of the snap-ring
in the body groove, start the retainer into the body. Lightly
press the snap-ring into the retainer until both the retainer
and snap-ring slide into the body.
For early design DiskFlo valves supplied with seat retainer
screws, the insert and retainer need to be installed into the
body with the disc open. The retainer screws need to be
loosely installed, then the disc is to be closed. After the closed
disc has centered the seat, tighten the screws. This permits a
tight shutoff as it allows the seat to align with the disc.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
Figure 3: Typical Packing Configurations
SafeGuard / SureGuard
Fire-safe Option
(live-loading omitted)
SureGuard
Standard Square
Standard Single "V"
Twin "V"
SafeGuard
(packing studs rotated 45 degrees)
Twin "V" with Lubricator
