Powers 593 Series Flowrite II Heavy Duty Bronze Globe Control Valves - Heavy Duty Bronze - Manual (Page 11)

PACKING
PACKING APPLICATIONS
The packing on a Flowrite II provides a “seal” around the valve stem to
prevent loss of the controlled medium (i.e., steam, water, thylene
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 II Utility Valves now utilize the spring loaded V-ring
packing. The teflon V-ring packing does not require lubricant. The EP
V-ring packing must be lubricated with silicine 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.
PARTIAL REPACKING
The top three packing rings can be replaced without disassembling the
valve, to minimize servicing time for critical system operation.
However, replacement of all four packing rings is recommended to
obtain optimum packing performance and life.
Coat new rings with recommended lubricant, slip rings around stem,
staggering cuts, push down as far as possible and tighten packing gland
nut sufficiently to compress the packing rings toward the bottom of
the packing gland. Loosen packing gland nut and readjust to “finger
tight” only. Pack the bonnet with recommended lubricant.
Note: Single set 2-way screwed valves should be
repacked in the closed position.
For complete repacking, see page 9.
Packing Type Application
Teflon V-Ring Effective from 200-400°F
(No Lubricant) Steam: Up to maximum PSI valve rating
Water: Up to maximum PSI valve rating
EP V-Ring Effective from 0-300°F
Silicone lubricant Steam: 50 PSI maximum
required for Water: Up to maximum PSI valve rating
installation,
optional for
service
Figure 1. V-Ring and Split Ring Packing
TI593UBS Page 11