Powers 595 Series 11 Self-Operating Temperature Regulators - Type ST Stainless Trim - Manual (Page 6)

DA/RA: To fully disassemble regulator from valve
1. Before disassembly, the bulb must be cooled 30°F
(16°C) below the lowest point on the thermal system
range, and fl ow through the valve must be stopped.
2. Figure 5. Relieve all pressure on the spring by turning adjust-
ing nut assembly [31] fully right to left (clockwise from top).
3. Figure 7. Remove housing bolts [6] and nuts [7] and tempera-
ture adjustment setting scale [8] and lift off thermal system [1]
(housing, bellows, capillary, and bulb)
4. Figure 8. Using one 3/8" wrench and one 5/16" wrench, care-
fully loosen and remove piston plate assembly [2,3] from the
stem extension [4]. Lift off spring [19].
5. Figure 9. Use 1-3/8" wrench to unscrew lock nut [11] and lift
off the yoke and bridge assembly [9].
. 6
8. Remove Piston Plate/Spring
5/16" Nut
Piston Plate Assembly
3/8" Nut
Spring
9. Lift off yoke and bridge
Locknut
Yoke and Bridge
7. Remove Housing and Thermal System
Maintenance
■
Numbers in brackets [#] refer to part numbers on pp. 12 & 13.
DA: To replace the valve seat only
See page 8 for construction of the Seat Ring Tool.
1. Before disassembly, the bulb must be cooled 30°F (16°C)
below the lowest point on the thermal system range, and fl ow
through the valve must be stopped.
2. Figure 5. Relieve all pressure on the spring by turning adjust-
ing nut assembly [31] fully right to left (clockwise from top).
3. Figure 6. Loosen lock nut [11] with 1-3/8" open end wrench.
Use the 1-3/8" wrench to unscrew bonnet [20] from valve
body [26]. DO NOT ALLOW the regulator top to rotate.
Lift up regulator top.
4. Figure 11. Insert Seat Ring Tool into valve body. Make sure
the bit engages the slots provided in the seat ring [25].
5. Turn counterclockwise to remove.
6. After replacing, make certain the new seat ring is tightly
screwed into place.
7. Assemble in reverse order.
6. Lift off Regulator from valve
Body
Retainer Nut
Plug
Bonnet
Lock Nut