Powers 595 Series 11 Self-Operating Temperature Regulators - Type CD Composition Disc - Manual (Page 7)

15. Thread the packing gland assembly [14] into the bonnet.
TIghten the gland assembly against the spacer.
16. With valve plug fi rmly seated, screw stem extension [4] to the
dimension shown in Figure 12 and tighten into place with hex
nut [12].
17. Assemble the remaining parts in reverse order.
Testing the Thermal System
■
If the valve is not responding to temperature change, test the
thermal system.
1. Stop the fl ow of fl uid through the line.
2. Raise the temperature of the the bulb above the set point
temperature by placing it a container of hot water. This will
cause the plug to fully seat.
3. Figure 13. With the valve plug seated, use a felt tip pen to
mark where the position of the packing gland assembly on
the stem.
4. Place the bulb in a pan of cool water. Cool the bulb 30°F
(16°C) below set point so the valve is fully open.
5. Use the pen to mark the new position of the packing gland
assembly on the stem.
6. The distance between the marks is the valve plug travel.
This should correspond with the TRAVEL value in the
VALVE DIMENSIONS table on page 8. No movement or
only partial movement indicates the thermal system is
defective and should be replaced with a new system.
Maintenance, cont.
■
To replace packing
Follow To fully disassemble regulator from valve steps 1-5.
5. Figure 10. Use a 5/16" wrench on the fl ats of the stem exten-
sion [4] and a 7/16" wrench on the hex nut [12] to loosen and
remove them.
6. Use the 1-3/8" wrench to loosen and remove bonnet [20].
7. Carefully pull out stem assembly [30]. Check the stem. It must
have a polished surface that is free of roughness and pitting.
Replace any parts if necessary.
8. Figure 11. Remove packing gland [14], and all packing
components [15a-15e].
9. Clean packing chamber, taking care not to scratch seating
surfaces. Be sure chamber is free of dirt and grease.
10. For 1-1/2" Valves: Place O-ring [21] on body before bonnet.
11. Replace bonnet [20] and stem [30] into valve body.
NOTE: You must replace the bonnet and stem before attempt-
ing to insert the packing. The rings will slide over the stem.
Otherwise, you may tear the packing rings.
12. For standard packing kits, installed the parts as shown in
Figure 11.
Slide part(s) [15e], followed by [15d] and [15c] over the stem.
Gently push them into the packing chamber.
NOTE: Some kits do not include all the listed packing parts (see
page 12), but the order for part installation is the same.
13. For EP V-rings, lubricate the rings fi rst.
Slide each V-ring [15b] over the stem and carefully
push it into the packing chamber.
14. Place the packing gland spacer [15a] on top of the bonnet.
WARNING: Failure of the #11's thermal system will cause a heat-
ing valve to full open and a cooling valve to full close. If either of these
valve states results in an unsafe process condition, a high-limit shut-
down device, such as a Powers Aqua Sentry, should be used.
Stem Assembly
7/16"
Hex Nut
5/16" Stem
Extension
10. remove stem extension and hex nut
Packing
Gland
Spacer
Packing
Gland
Packing Kit
(15a-e)
Bonnet
Stem
Disc
11. Packing Components, bonnet and stem
Distance between two
marks = Valve Travel
13. valve travel measurement
Top of Stem
Extension
Hex Nut
Top of Bonnet
12. Stem extension Reassembly dimension
[257mm ]
+1/32"
- 0"
10-1/8"
+.79mm
- 0mm
7