Powers 595 Series 11 Self-Operating Temperature Regulators - Packing - Manual (Page 2)

The packing on a Flowrite valve or #11 Regulator provides
a seal around the valve stem to prevent loss of the controlled
medium (i.e., steam, water, ethylene glycol solutions, etc.),
while allowing the valve stem to pass through the packing for
functional opening and closing of the valve.
V-RING PACKING
All Flowrite Valves and #11 Regulators now utilize the
spring loaded V-ring packing, choose the proper and V-ring
packing kit from Table 1. The teflon V-ring packing does not
require lubricant. The EP V-ring packing must be lubricated
with silicone grease (part #590-165A) prior to installation.
Use of lubrication in service is optional. The packing rings
are not split and disassembly of the valve is required to
install or replace this packing.
Repacking Procedure...
CAUTION: Isolate the valve so medium (water, steam,
etc.) will not leak out of the valve body when disassembled.
1. For Flowrites, remove and cap airline to valve actuator.
2. Remove actuator and disassemble valve body.
3. Check the stem. It must have a polished surface that
is free of roughness or pitting, Replace the stem if
necessary(see applicable Product Manual for stem
part number).
4. Remove the old packing and clean packing chamber.
Be sure it is free of dirt and grease.
5. On valves with removable stem bearing (ST, SD),
examine it and replace if damaged. If replaced use epoxy
type adhesive (required only on ST valve)to hold the new
bearing in place.
6. Slide the stem assembly into the bonnet.
7. The packing parts must be installed in the exact order
shown in Figure 1. Place split ring (split ring must be
lubricated), washer, and spring over the stem and gently
push each piece into the packing chamber.
8. Slide each V-ring (EPV-rings must be lubricated) over
the stem and carefully push it into the packing chamber.
9. Place gland spacer on top of bonnet.
10.Thread the packing gland assembly into the bonnet.
Finger tighten the gland assembly against the spacer.
11. On valves with an “O”-ring seal(Reverse acting ST type
valves, 1-1/2 - 2"), located on the bottom guide, remove
old seal and replace it with a new one.
12. Reassemble the valve body and attach the actuator.
IMPORTANT: Set stem length correctly
13. For Flowrites, connect the air line to the actuator.
Form TB-237 v4 0510 Page 2
PACKING APPLICATIONS
TYPE SIZE STEM DIAMETER
OF inches AT PACKING
VALVE inches (mm)
CD 1/2 thru 1-1/2 1/4 (6.4)
WM 1/2 thru 3/8 (9.5)
DB/DS 1 thru 2 1/4 (6.4)
SD 3/4 thru 1 1/4 (6.4)
1-1/4 yhru 2 3/8 (9.5)
SS 1/2 thru 1 1/4 (6.4)
V-PORT 1/2 A,B,C,D 1/4 (6.4)
Table 2. Valve Stem Sizes