Ii.operation, Iii. maintenance, Worcester controls – Flowserve 94 Series User Manual
Page 2
2
06957-L
6. Tighten and torque the body bolts of the valve evenly and
diagonally opposite each other, alternating in a criss-cross
pattern. Use the torque figures shown:
Carbon Steel Bolts
Stainless Steel & Alloy 20 Bolts
Bolt. Dia.
In.-Lbs.
Ft.-Lbs.
Bolt Dia. In-Lbs.
Ft.-Lbs.
1
/
4
"
96-120
8-10
1
/
4
"
72-94
6-8
5
/
16
"
156-204
13-17
5
/
16
"
120-144
10-12
3
/
8
"
216-264
18-22
3
/
8
"
192-216
16-18
7
/
16
"
480-540
40-45
7
/
16
"
336-384
28-32
1
/
2
"
720-780
60-65
1
/
2
"
504-552
42-46
NOTE: Stainless steel bolts and nuts are used in all three-
piece valves with stainless steel bodies and also valves with
“GG” seats and body seals.
D. CAUTION: The fluoropolymer body seals (code T) and the
coated stainless steel stainless steel gaskets (codes M & G)
make excellent seals. However, some points of caution in their
use need emphasizing:
1. No coated stainless steel gasket body seal, graphite seat back
seal or fluoropolymer part (except a seat) is reusable. Upon
disassembly of the valve, they should be discarded and
replaced with new parts.
2. Avoid scratching or damaging the fluoropolymer seals or the
coating of the “S” gaskets during installation. Light lubrication
of these seals can help to prevent damage.
3. “S” gaskets are installed with the wide flange against the
valve body (see View A-A on page 7).
4. Care must also be taken when handling graphite seat back
seals, stem seals, thrust bearings, and body seals. These
parts can be easily damaged by squeezing the O.D. Parts
should be handled on the flat surfaces rather than the O.D.
These parts will not work if they are cracked or broken. Light
flaking of the material is acceptable.
5. The ball used in “A” or “G” (filled metal) seated valves is
round to special tolerances. To ensure proper contact with the
seat, do not drop, dent or scratch the ball during handling.
These balls also have an anti-galling coating; DO NOT use
uncoated balls with filled metal seats.
II.OPERATION
A. The operation of the valve consists of turning the stem (by
manual or automated means)
1
/
4
turn clockwise to close and
1
/
4
turn counter-clockwise to open. When the handle (if used) and/or
stem flats or groove are in-line with the pipeline, the valve is
open.
B. 94 Series valves will provide bubble-tight shutoff when used in
accordance with Worcester’s published pressure/temperature
chart, with the exception of “G” seated valves. Valves with “G”
seats meet the leakage rates of ANSI B16.104 Class VI.
C. Do not leave the ball partly open (throttling operation) without
having first determined whether the pressure drop and/or flow
rate are detrimental to the valve seats. These conditions should be
checked with Worcester’s Control Valve Manual or the factory.
D. As shipped from the factory, valves (except oxygen prepared
(prefix code “X”), and valves with V38 or V46 options) contain a
silicone-based lubricant. This is for break-in purposes and may be
removed if it is objectionable for a particular application by
disassembling and solvent washing. Lacquer thinner will remove
the lubricant. “A” or “G” (filled metal) seated valves should not be
operated without a break-in lubricant.
E. Media that can solidify, crystallize or polymerize should not be
allowed to stand in ball valve cavities.
F.
Torque Requirements: Operating torque requirements will vary
depending on the length of time between cycles, media in the
system, line pressure and type of valve seats. The figures in the
following table are based on laboratory tests with clean tap water
as the media. They are measured at WOG rated pressure, 70°F,
after 24 hours. For a more detailed analysis of valve torque
requirements, see Worcester’s Actuator Sizing Manual.
Maximum Expected Breakaway Torque (In.-Lbs.)
All Seats
Valve Size
Except A, G, X
A, G, X Seats Only
1
/
2
"
125
225
3
/
4
"
150
275
1"
250
360
1
1
/
4
"
400
550
1
1
/
2
"
600
750
2"
750
850
3"
1800
2100
4"
2500
3600
6"
6500
7500
NOTE: Media that contain fine powders (25 microns or less) will
significantly raise ball valve torque requirements.
III. MAINTENANCE
For maximum stem seal life, proper packing adjustment procedure
must be followed.
A. Tighten packing gland bolts to the torque values in the table
below. Alternate between the two gland bolts when tightening to
maintain the alignment of the gland plate with the top of the valve
body. Some rocking of the gland plate can be tolerated; however,
excessive misalignment may cause premature failure of the stem
packing.
Flow Control Division
Worcester Controls