Powers 595 Series 11 Self-Operating Temperature Regulators - Type ST Stainless Trim - Manual (Page 7)

DA/RA: To replace packing
Follow steps 1-5, To fully disassemble regulator from valve.
6. Use the 5/16" wrench on the fl ats of the stem extension
[4] and the 7/16" wrench on the hex nut [12] to loosen and
remove them.
7. Use the 1-3/8" wrench to loosen and remove bonnet [20].
8. 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.
9. Figure 12. Remove packing gland [14], and all packing
components [15a-15e].
Clean packing chamber, taking care not to scratch seating
surfaces. Be sure chamber is free of dirt and grease.
10. Replace bonnet [20] and stem [30] into valve body.
NOTE: You must replace the bonnet and stem before attempt-
ing to insert the packing. Otherwise, you may tear the
packing rings.
11. For standard packing kits, install 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.
12. 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.
13. Place the packing gland spacer [15a] on top of the bonnet.
14. Thread the packing gland assembly [14] into the bonnet.
Tighten the gland assembly against the spacer.
15. With valve plug fi rmly seated (Stem fully down for DA, Stem
fully up for RA), screw stem extension [4] to the dimension
shown in Figure 13, and tighten with hex nut [12].
16. Assemble the remaining parts in reverse order.
DA/RA: To replace valve plug and seat
Follow steps 1-5, To fully disassemble regulator from valve.
6. DA: Figure 10A. Unscrew bonnet [20] from valve body [26].
Lift off stem assembly and bonnet. Remove retainer nut [22].
Replace plug [24].
RA: Figure 10B. Remove valve cap [29] from the bottom and the
bonnet [20] from the top of the valve body [26]. Remove stem
retainer [22] and valve plug [24], then the stem assembly [30]
7. Figure 11. Insert Seat Ring Tool into valve body. Make sure
the bit engages the slots provided in the seat ring [25].
Turn counterclockwise to remove.
8. After replacing, make certain the new seat ring is tightly
screwed into place.
9. Assemble in reverse order.
7
Stem
Retainer Nut
Plug
Bonnet
10A. (DA) Remove Plug retainer nut and plug
Plug
Body
Bonnet
10B. (RA) Remove valve cap/remove stem and plug
Valve Cap
Retainer Nut
11. Seat ring removal
Seat Ring Tool
Insert into body of
valve. Bit will engage
slots in seat ring.
Seat Ring
Packing Gland
Spacer
Packing Kit
(15a-e)
Packing
Gland
Bonnet
12. Packing Components
13. Stem extension Reassembly dimension
Hex Nut
[257mm ]
+ 0mm
- .79mm
[263mm ] 10-11/32"
Reverse Acting - Stem UP
+ 0"
- 1/32"
Direct Acting - Stem DOWN
10-1/8" +.79mm
- 0mm +1/32"
- 0"
Top of
Bonnet
Top of Stem
Extension