AirSep AS-Q, Инструкция по эксплуатации, Страница: 135 / 198

AS-Q—AS-Z Series Instruction Manual 135
AirSep Corporation
4. Carefully clean the gasketing surfaces with a suitable
solvent. They should be free of all grooves and
scratches. If deep scratches are present, polish or repair
is required.
5. Clean the valve and deburr the insert.
6. Carefully clean and polish the disc. It should be free
from all grooves and scratches.
7. If the disc is slightly damaged, it may be possible to
smooth the sealing surface with crocus cloth, a fine
stone, or the equivalent. If deep scratches are present,
replace disc or return the valve to the factory for
service.
8. Cycle the valve closed.
9. A body seal (40) is required between the seat tail and
body as shown in (Figure 10). The valve uses a graphite
type gasket. This is installed in accordance with the
following steps:
a.
IMPORTANT: Exercise care at all times not to
damage the gasket. A break may cause the gasket
to leak.
b. The bottom surface of the insert is to be free of all
foreign particles. Clean thoroughly with suitable
solvent.
c. Apply the gasket to the body, and if a lug style,
take care to align the holes in the gasket with the
insert screw holes.
10. Verify that the disc is in the level position. Install new
seat and insert (See Figure 9 & 10). For bolted inserts,
install the insert screws, and tighten them uniformly.
Torque values are given in (Table 1). Whenever
possible, open the valve and retorque the insert screws
per (Table 2). Take care not to damage the sealing
edge of the disc. Close the valve. For snap-in inserts,
place the retaining spring into the groove in the body,
opposite the positive stop (See Figure 8). The tips
of the spring should be toward the insert side of the
valve. Lightly tap one end of the spring into the body
groove. Be sure the spring is positioned snugly into the
groove. Lightly tap the other end of the spring into the
groove. Make sure the tips of the spring are embedded
into the body groove to prevent spring movement.
With the seat assembled into the insert, and the disc
slightly open, install the assembly into the body, such
that it is angled into the body to engage the retaining
spring. Once the retaining spring is engaged, “pop”
the opposite side of the insert into the body by lightly
tapping the insert with a block of wood and a hammer.
11. Set the actuator stops as described in the ACTUATOR
MOUNTING INSTRUCTIONS Section. Do not install and
tighten flanges on a newly reseated valve until the
actuator stops are properly set and the valve is fully
closed. Incorrect disc positioning may cause damage
to a new seat when the valve is compressed between
flanges for the first time. NOTE: After installation of a
new seat, torque will be higher for a few cycles.
4.6 Shaft Seal Replacement
Numbers in ( ) refer to items shown in (Figure 15).
NOTE: See IMO-317 for live loaded shaft seals.
CAUTION: Read the WARNINGS before proceeding.
1. Remove the handle or actuator coupling.
2. Remove the nuts (15) from above the compression
plate (10). Remove the compression plate (10). The
studs (14) do not have to be removed.
SNAP-IN INSERT
BOLTED INSERT
77
2
21
2
5
40
Figure 9
Figure 10
REFER TO
(FIGURE 5) FOR
COMPLETE VALVE
Disc in
Level Position
Body
Seal
BOLTED INSERT
SNAP-IN INSERT
Seat
Insert
IMO 1/18
IMO-308 EN 9