Dresser/Cooper Three Piece Ball Valves - Special Applications
Oxygen
Service
Chlorine Service
Vacuum
Service
For
Oxygen Service
Cooper
offers a complete line of valves for oxygen applications
ranging from laboratory requirements to basic oxygen steel
furnace systems. Sealing design assures absolutely positive
shut-off.
Included
are ball valves in screwed end, socketweld and buttweld,
ANSI Class 150, 300 and 600 flanged valves.
Recommended
materials in which these valves are made are 316 stainless
steel and monel. Because of the hazardous nature of oxygen
service, carbon steel is not recommended.
A
rigid procedure is utilized by Cooper to insure cleanliness
of all valves specified for use on oxygen service because
of the inherent danger of oxygen reacting with any grease,
oil, or combustible material left in a piping system.
All parts are first carefully examined to make sure they
are free of burrs, chips, or other foreign matter. They
are then thoroughly washed, rinsed, and finally dried
with oil-free filtered air.
The
valves are assembled using only lubricants compatible
with oxygen. They are then tested on designated equipment
using special tools that have been cleaned in the same
manner as valve components. Valves are hydrostatically
tested and dried with filtered air. After being tagged
to identify them as having been processed for oxygen service,
valves are sealed in clear polyethylene bags.
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For Chlorine Service
Description
Cooper chlorine valves are specially prepared models.
They've been specifically designed to Chlorine Institute
guidelines. And they're ideal for chlorine gas, chlorine
liquid, and snift gas applications.
Each
valve features a positive relief hole in the ball which
assures no pressure build-up in the valve cavity and a
long list of standard features like: resilient seats for
bubble-tight sealing, self compensating bottom entry stem
design for optimum safety, and easy automation for control
valve applications.
Cooper
chlorine valves are available in sizes 1/4" through 10",
with a variety of pipe and styles: screw end, socketweld,
buttweld and ANSI Class 150 and 300 flanged configurations.
Oval or safety handles are available upon request.
Applications
- Typical
chlorine gas or liquids applications include:
- Bleaching
-Textiles, Pulp and Paper
- Potable
Water Treatment
- Wastewater
Treatment
- Swimming
Pool Treatment
- Aluminum
Production/Aluminum Fluxing
- Food
Packaging and Processing
- Chemical
Processing
- Cooling
Water Chlorination
- Industrial
Process Water
- Poultry
and Fish Processing
- Potato
Starch Industry
Unique
design features make Cooper ball valves ideal for handling
liquid or gaseous chlorine. Cooper chlorine valves are
specially cleaned and prepared as recommended by the Chlorine
Institute.
Cooper
Design Features for Chlorine Service:
I.
Belleville washers for automatic compensation of temperature
and pressure fluctuations.
2. Back-seated, bottom entry stem provides added safety.
3. Retaining nut for manual adjustment of stem seal after
lengthy service. Also maintains stem integrity.
4. Upstream relief hole enables expanding chlorine to
relieve harmlessly upstream while valve is closed. Note
that the chlorine valve must be installed so that the
relief hole is toward the pressure source.
5. Stem slot relief enables expanding chlorine to exhaust
from the body cavity (into main flow) while valve is open.
Eliminates seat deformation.
6. Positive indication on body to indicate direction of
flow.
Moisture
Content
(parts per million of water) |
Valve
Materials |
| 0-20
ppm |
All
stainless steel |
| 20-50
PPM |
SS
body with monel ball and stem |
| 50
PPM & more |
All
monel or monel with
Hastelloy C ball & stem
|
Note:
Dead end service is particularly severe and Hastelloy
C ball & stem or all titanium is required.
Reinforced TFE is recommended as seat material for all
chlorine applications.
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For
Vacuum Service
Inherent
features of Cooper ball valves make them well-suited for
vacuum service, and have led to their being used in a
wide variety of applications.
Some
of these features are:
- Positive
sealing-no through-leakage or in-leakage past the stem.
- Full
unobstructed flow, decreasing evacuation time when pumping
vacuums.
- 90°
operation to open or close.
- Wide
selection of materials to suit specific service conditions.
- Ability
to seal in either direction-suitable for alternating
vacuum- pressure processes.
- Resilient
materials limited to polymeric seats, minimizing out-gassing
problems.
Standard
Cooper ball valves in all materials and sizes are rated
to hold vacuums up to 20 microns (2 x 10-2
torr) of absolute pressure.
For
vacuum service below 20 microns, Cooper high vacuum series
ball valves are recommended. These valves are prepared
with extremely close control of seat and seal tolerances
to ensure complete tightness, and with special attention
to quality of finished surfaces. Provision is made to
vent and evacuate the body cavity. All components are
specially cleaned, and valves are tagged, then sealed
in polyethylene bags.
These
high vacuum valves are guaranteed to have a leakage rate
not to exceed 10-6mm. Hg. of absolute pressure.
If required, high vacuum valves may be tested on a helium
mass spectrometer by an independent laboratory and certified
for this figure at .01 micron. Listed below are vacuum
ratings and recommended temperature ranges of both standard
and high vacuum Cooper ball valves with TFE seats and
seals.
| Type
of Valve |
Temp
Range |
Vacuum
Rating |
| Standard
valves-all sizes and styles |
-50°
to +400°F |
20
microns |
| High
vacuum valves-all sizes and styles |
0°
to +300°F |
10-6mm
Hg. |
| Type
of Valve |
Atmospheres
|
PSIA
|
Inches
of Mercury |
Millimeters
of
Mercury (TORR) |
Microns
(TORR x 1000) |
Standard
Valves |
1
|
14.7
|
29.92
|
760
|
760,000
|
| 0.068
|
1
|
2.04
|
51.7
|
51,700
|
| 0.033
|
0.49
|
1
|
25.4
|
25,400
|
| 0.00132
|
0.0193
|
0.0394
|
1
|
1,000
|
| 2.64
x 10-5 |
3.86
x 10-4 |
7.9x10-4 |
0.02
|
20
|
High
Vacuum
Valves |
9.87
x 10-6 |
1.45x10-4 |
2.95
x 10-4 |
0.0075
|
7.69
|
| 1.32
x 1 0-6 |
1.93x10-5 |
3.94
x 10-5 |
0.0010
|
1
|
| 1.32x10-8
|
1.93x
10-7 |
3.94
x 10-7 |
1.0
x 1 0-5 |
.01 |
Cooper
ball valves are used in a wide range of vacuum service.
Standard valves with no special preparation con be used
effectively in vacuum service down to 20 microns. Valves
especially prepared for high vacuum service can be used
below 20 microns, down to 10-7 mm. Hg. There
are various ways of measuring vacuum service which can
result in confusion as to what a rating means. Some of
the more common measurements for vacuum service ore given
below.
Common
measurements for vacuum service:
1.
Atmospheric pressure (sea level, 0°C) = one atmosphere
2. 1 Atmosphere = 760 millimeters of Mercury (mm. Hg)
3. 1 Atmosphere = 29.92 inches of Mercury = 14.7lbs./sq./in.
4. 1 mm. Hg = .0013 atmosphere (roughly 1/1000th of an
atmosphere)
5. 1 Micron Hg = .001 millimeters of Mercury 6. 1 Micron
Hg = .0000013 atmosphere (roughly one millionth of an
atmosphere)
7. Hg is the symbol for Mercury
8. mm = millimeters
9. Typical leakage unit = 1 standard cc per second = 1
cubic centimeter of gas at atmospheric pressure (often
shortened to cc/sec)
10.
1 Torr = 1 millimeter of Mercury
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