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DCG™ Technical Data
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DCG™ - Dual Coaxial Gas Seal
UTEX Industries, Inc. has developed a dual coaxial gas seal with all
the benefits of a dual pressurized seal. The DCG seal (Patented) will fit most popular ANSI
pumps including those with small diameter stuffing box bores. The new
seal design achieves one of the shortest axial sealing lengths by
utilizing two unique seal faces on the same plane and same axis.
The DCG seal has been designed to accept
injected gas pressure directly between the faces. The outer coplanar
seal face allows a minute amount of gas into the process fluid side. The
unique design provides an effective positive barrier against any escape
of process fluid to the atmosphere.
The new DCG seal provides reliable sealing for
abrasive, low lubricity and multiphase liquids because the gas flow
effect creates a barrier that keeps harmful particles away from the seal
faces. In the event of loss of gas pressure, the DCG is capable of full
recovery once gas pressure has been re-established in non-abrasive and
non-sticky fluids. Under a loss-of-gas condition, the seal will operate
as a conventional contacting seal and will contain the process fluid
with controlled leakage.
The DCG seal operates without contact
which eliminates high frictional heat. Seal life and time between
planned maintenance is dramatically increased, reducing operating cost.
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| Part |
Materials |
| Metal
Components |
Standard
- 316 Stainless Steel |
| Seal
Rings |
Stationary
- Carbon is standard
Rotary - Silicon Carbide is standard
Other materials are available
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| Static
Elastomers |
Standard
- Fluorocarbon O-rings
Other materials available |
| Dynamic
Secondary Seals |
Low
Friction PTFE Lip Seals |
| Parameter |
Operating
Range |
| Temperature |
0°
to 450°F (18° to 230°C) |
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Pressure |
0
to 300 psi (20 bar) |
| Speed |
Up
to 5000
fpm (25 m/s) |
DCG™ Features and Benefits
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Features |
Benefits |
| 1.
Unique double step lift-off face design. |
1.
Provides complete lift-off and zero wear. |
| 2.
Provides an effective positive pressure barrier against any escape of
process fluid to the atmosphere. |
2.
Zero emissions. |
| 3.
Coaxial coplanar face design (two active gas seals on a single face). |
3.
Achieves the smallest axial space - fits most ANSI pumps. |
| 4.
Operates without face contact. |
4.
Results in low heat generation and power consumption. |
| 5.
Low friction PTFE secondary seals. |
5.
Prevents hang-up problems. |
| 6.
Springs are isolated from the product. |
6.
Prevents clogging of the springs. |
More Technical
Information About the DCG™
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Simple Control Panel |
A standard control panel is required to maintain
filtered gas (air or nitrogen) pressure at 20 to 30 psi (0.14 to
0.21 MPa) above the maximum anticipated stuffing box pressure.
This totally self-contained control panel consists of a ball
valve, pressure gauge, check valve, flow meter, integrated
filter and regulator.
PDN: 7602-00-0000-01
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| Applications |
Toxic Services, Hazardous
Services, Acid/Caustic Services, Environmentally Sensitive
Services, Dry Running Applications |
| Industries Served |
Refineries and Petrochemicals,
Waste-Water Treatment, Pulp & Paper, Food Processing |
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Available DCG™
Cartridge Seals
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©2009 UTEX Industries Inc. All rights
reserved.
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