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TRICENTRIC Features |
- Quarter turn convenience
- Tight metal-to-metal sealing
- Long life seats
- Torque seated, self-compensating for temperature differences
- Fire-safe, tested to API 607
- Cyrogenic proven
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- Shell tested to ASME and MSS standards
- Blowout proof shaft per API-609
- Non binding/sticking seats
- Excellent flow / control characteristics
- Zero leakage
- Bi-directional
- API-598 resilient seated performance
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Today's demanding projects require a quality valve
that is reliable, cost-effective, true to specifications
and most importantly, proven in the field - over a wide
range of applications and conditions.
Throughtout the world, today's engineers, as well as
project and maintenance managers, specify Tricentric Valves
for their Power, Processing, Refinery and most critical
applications worldwide.
Weir Valves & Control designs, manufactures and services
engineered, high-specification valves in accordance with a
comprehensive quality assurance program. The design standard
is ANSI B16.34 with international and customer standards
invoked as required. |
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The TRICENTRIC principle of operation is geometry in motion.
Both the seat in the body and the seal on the disc are surfaces
of a cone wich is sectioned at an angle. The valve shaft is
located slightly to one side of the seat center and a lttle bit
above the plane of the seat. Its center of rotation is also
somewhat offset from the axis of the imaginary cone which
estends from the surface of the seat.
When the valve is closed, the surface of the seal and the seat are
in full contact at all points. Any effort to try to further
close the disc (rotate it into the seat) increases the sealing force
and tightens the valve. This allows the valve to be bi-directionally
tight.
Opening the valve, or rotating the disc away from its seat, results
in the seal moving away from the seat at all points. This action
eliminates rubbing or sliding of the seating surfaces thus avoiding wear.
Tricentric features true non-rubbing seating surfaces for long life and tight shutoff.
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Tricentric Sealing System |
Triple Offset
Offset #1: The shaft is positioned forward of the valve seat
providing an uninterrupted seating surface.
Offset #2: Centerline of disc rotation is located away
from the centerline of the seat allowing the seal to lift off
and away fromt he seat on opening.
Offset #3: The cone axis is offset from the centerline
of the seal to provide a conical sealing surface that allows the seal
to rotate in and out of the seat without interference, sliding or jamming.
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