Jordan Valve 657M Series Diaphragm Actuator User Manual
Page 2
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Operation and Adjustment Continued,
The Jordan Valve nameplate indicates a “bench set”
pressure range in addition to a standard diaphragm
pressure range. The “bench set” pressure range indi-
cates the range required to completely stroke the valve
with out any pressure in the valve body, for example
as if the valve were being tested on the work bench.
While In service, however, with the specified pressure
drop applied across the valve, it should stroke over the
standard diaphragm pressure range as indicated on the
nameplate.
Once the control valve has been installed and connect-
ed to the controller, it should be tested for correct travel,
lack of friction and correct action (air-to-open or air-to-
close) to match the controlling instrument. To ensure the
most effective operation, the actuator stem and the valve
plug stem must move freely when responding to the
loading pressure change on the diaphragm.
Disassembly Instructions
Although the following instructions describe how the
657M Diaphragm Actuator can be completely disas-
sembled, when inspection or repairs are required, only
disassemble those parts required to accomplish the job.
Consult Figure 3, and proceed as follows for
disassembly:
1.
Bypass the control valve and exhaust any actua-
tor loading pressure to atmospheric. Discon-
nect the actuator supply line and any
leakoff piping.
2.
Relieve all pressure from the spring by threading
the spring adjuster (key 2) out of the yoke.
3.
To remove the valve body from the actuator,
separate the stem connector (key 21)
and remove the yoke locknut.
4.
Loosen the stem locknuts (keys 13 and 14),
remove the two cap screws and separate the
stem connector.
5.
Loosen the diaphragm case cap screws and
nuts (keys 19 and 20) and remove the
upper diaphragm case.
6.
Remove the molded diaphragm (key 6).
7.
Extract the diaphragm plate and actuator stem
(keys 5 and 3) as an assembly. These parts can
be further separated if required.
8.
Remove the actuator spring (key 1) and spring
seat (key 4).
9.
If necessary, remove the lower half of the dia-
phragm case (key 8) by loosening the
cap screws.
10.
Removing the spring adjuster will complete the
disassembly.
Assembly Instructions
1.
The 657M Actuator can be assembled
in the reverse order of the disassembly
instructions. These additional steps below will
assist with proper assembly and continued
operation.
2.
Apply lubricant to the threads and spring seat
bearing surface of the spring adjuster (See loca-
tion marked “LP” on Figure 3).
3.
Ensure that the spring seats and the lower seat
align properly and rest against the diaphragm
plate.
4.
Use a criss-cross pattern to evenly tighten the
nuts on the casing bolts.
5.
If the stem locknuts were removed during disas-
sembly, install them onto the valve plug stem
and place the travel indicator (key 12) with the
cupped side downward.
6.
Secure the actuator onto the valve body using
the yoke locknut.
7.
Assemble the stem connection as follows
according to the required action:
a.
Mounted on Body with “Push Down to
Close” Valve Plug
i.
When the body is assembled
and the actuator is mounted,
ensure the valve plug is in the
closed
position.
ii.
Once the locknuts are secured
onto the stem, set the travel
indicator disc onto the locknuts
with the cupped portion
facing
downward.
iii.
Raise the valve plug off of the
seat, with the travel specified on
the nameplate, or, pressure the
actuator until the stem
moves down the specified valve
travel.
iv.
Install the stem connector by
clamping
the
actuator
stem to the valve stem.
v.
Raise the indicator disc to the
stem
connector,
using
the locknuts to tighten in
position.