11
306715
Service
Needle, Seat and Packings
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure
on page 8.
To clean or replace the needle (22), its seat (23) or
packings (9 or 20),
relieve the pressure
, then flush
the valve with a compatible solvent.
Relieve the
pressure
after flushing and disconnect the fluid
hose(s). Screw the locknut (8) off the outlet housing
(17) and align the slot in the air piston (16) with the slot
in the valve housing (18). Swing the outlet housing out
of the valve housing and slide the needle out of the
socket in the air piston.
Screw the packing nut (10) out and remove the pack-
ings (9 or 20), gland (24, model 207440 only), and
needle (22). Screw the seat (23) out of the outlet
housing (17). See Fig. 3. Handle the needle and seat
carefully and inspect them closely for wear or damage.
Reassemble the valve using new parts as necessary.
Soak a new leather packing in light, compatible oil
before installing it.
NOTE:
When reassembling models 205435 and
205612, torque the seat (23) to 23–27 ft-lb (31–37
N
S
m)
Air Piston, Spring and Seals
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure
on page 8.
Relieve the pressure
, then disassemble the valve as
explained above. Remove the air cylinder cap (13),
take out the spring (14) and pull the piston (16) out.
Clean and inspect all parts. Check the piston o-rings (5
and 6) carefully. Lubricate all parts with a light water-
proof grease and reassemble the valve using new
parts as necessary.
Packing Configurations
As shown in the following chart, on Models 205435,
205612, and 207440 the standard packings are two
181523 UHMWPE packings and one 166258 leather
packing.
If your usage requires packings different from those
that are standard on your valve, refer to the chart of
available packing configurations.
Model
No.
Standard
Packings
Optional
Packings
205435
and
205612
(2) 181523
UHMWPE and (1)
166258 leather
(3) 166258 leather
207440
(2) 181523
UHMWPE and (1)
166258 leather
(3) 166258 leather
NOTE:
For applications using abrasive fluids,
UHMWPE/leather packings are recommended.
r
packings are not recommended for abrasives.
Fig. 3
06483
06484
16
22
8
10
17
12
10
22
23
13
16
8
24
9, 20
17
25
26
1
2
14
6
5
18
2
1
2
2
Torque to 23–27 ft-lb (31–37 N
S
m)
Models 205435 & 205612 only
Lubricate
Model 207440 Shown
PTFE
Summary of Contents for 205435
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