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Triple Offset Valve (For more information
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Technical Data Sheet
Design Features:
- 'ZERO'
leakage
- Bi-directional,
metal to metal resilient sealing
- Triple
eccentric, no rubbing during valve stroke
- One
piece shaft with blow-out proof design
- Adjustable
shaft seal for low emission
- Quarter
turn design
- Low
torque therefore low cost of automation
- Less
weight / small space
- Worm
gear operated
- Inherently
Fire Safe & Antistatic
- Minimal
maintenance
- Replaceable
seal ring
- Cavities
do not exist
Range:
- 3" to 48" and larger sizes
- Pressure Rating ASME Class : 150 / 300 / 600 / 900
- Temperature range : -1960 C
to + 8150 C
Options:
- Live loaded shaft sealing
- Extended bonnet for low temperature
application
- Cryogenic application
- High temperature application
- Steam jacketing
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Technical Features:
Body: Cast Steel, with a conical hard faced Stellite seat
which provides excellent resistance for erosive, abrasive and / or
corrosive applications.
Disc: Designed as a support / carrier mechanism for the seal
ring.
Seal Ring: The seal ring is the actual sealing member (trim) made
either of alaminated ring or of solid metal ring depending on
the application. The "camming" action of the seal
ring during the stroke of the valve, thanks to the double eccentricity
of the disc, combined with a slanted conical seat (which provides
the third eccentricity) generates no wearing or wiping of the
seal ring on to the seat, but merely compresses it in the final
shut-off position.Located on the disc, the seal ring is machined
with a continuously changing slope to match the slanted conical
shape of the seat and structured to withstand the compression
due to the torque applied. It is designed to "flex"
and form itself to the seat when it first contacts the seat
and to compress while the valve is torque into the seat. The
compression generates a "spring effect" making the
torqued seal ring a resilient member.
Seat / Seal: The geometry eliminates rubbing between seat and seal
assembly during valve stroking. With this design the seat becomes the valve
mechanical stop thereby eliminating the need for an added mechanical stop
which could possibly be misadjusted.
Torque Seated: The valve is sealed by means of the torque applied to
the shaft and not the position of the disc or the system pressure. This
allows for a uniform load on the seal regardless of any wear or stop
misadjusted.
Shaft: Solid one piece and oversized for the pressure rating.
Anti blowout device in accordance to API 609 is a standard feature.
Packing: Easily adjustable from outside and replaceable.
Applicable
Standards:
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Design:
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API 609 / ASME B 16.34
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Manufacturing:
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API 609 / ASME B 16.34
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Face to Face:
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API 609, ASME B16.10, ISO 5752
Series 13/Series 14
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End Connection:
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ASME B 16.5 / B16.47
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Testing:
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API 598
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Fire Test:
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API 607 Fifth Edition, June 2005/ISO
10497-5:2004,
API 6FA
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Material Conformance:
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NACE MR 01-75
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