How do triple offset valves work?

A Triple Offset Butterfly Valve has 3 separate offsets. Two of the offsets apply to the location of the shaft in respect to the centerline of the bore and the centerline of the disc/seat sealing surfaces. The third offset is the design in the axis of the seat cone angle.

What is Vanessa valve?

The Vanessa triple offset valve was the first to provide bidirectional zero leakage* performance for positive isolation, creating a new industry category using a technology not previously available with other quarter turn valves.

Where are Vanessa valves made?

Vanessa Series 30,000 manufacturing plant is conveniently located near major highway links and just a short drive away from Linate and Malpensa International Airports in Milan.

What’s different about zero double and triple offset butterfly valves?

Two are placed in a similar position to the double offset butterfly valve, while the third offset is the geometry of the seating surface, creating a type of cone shape of the disc and seat. The triple offset valve is used in similar industries as the double offset butterfly valve, but in more demanding applications.

What is valve offset?

Valve offset is an adjustable control parameter which affects the amount of drive power applied to a closed valve.

What is high performance butterfly valve?

High Performance Butterfly Valves use a disc offset from the seat center, hence the name Double Offset. In this configuration, the disc is eccentric, or offset, from the valve seat. This feature allows the use of offset butterfly valves in high‐pressure applications such as ethanol or HVAC.

What is the use of the Vanessa valve?

Vanessa valves are suitable for positive isolation providing leak free protection when undertaking unscheduled maintenance of other equipment. Vanessa valves are capable of performing several process and safety protection functions with a single product including on-off, high frequency/switching, flow control and ESD.

What is api609?

API 609 is the American design standard forbutterfly valves, which is divided into Category A and B. Also known as rubber lined butterfly valves. These are popular in low pressure systems (Class 150 or less), relatively lower cycle life, rubber liners are also good for abrasive slurry services.

How does a butterfly valve work?

A butterfly valve is from a family of valves called quarter-turn valves. In operation, the valve is fully open or closed when the disc is rotated a quarter turn. The “butterfly” is a metal disc mounted on a rod. When the valve is closed, the disc is turned so that it completely blocks off the passageway.

What is high performance valve?

What is a High Performance or Double Offset Butterfly Valve? High Performance Butterfly Valves use a disc offset from the seat center, hence the name Double Offset. In this configuration, the disc is eccentric, or offset, from the valve seat.

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What are the features of Vanessa triple offset valves?

Vanessa Triple Offset Valves, Series 30,000 VanessaTriple OffseT ValVes, series 30,000 © 2012 pentair ltd. all rights reserved. Vanessa triple offset design and unique sealing elements provide zero leakage* through non-rubbing 90-degree rotation across a wide range of pressure and temperature conditions. Features

How many Vanessa valves are in the world?

There are now over 300,000 Vanessa valves operating around the world. Our triple offset design completely eliminates any rubbing action of the sealing elements during the 90 degrees of rotation, positioning Vanessa as the ultimate process valve.

What makes Emerson Vanessa series 30, 000 valves so durable?

The materials chosen for sealing, coupled with precise machining, significantly contribute to extending the life of the valve. Every Vanessa Series 30,000 valve in basic configuration features a smoothly grinded seat with Stellite ® grade 21 weld overlay highly resistant to galling, abrasion, erosion and corrosion.

Which is the first triple offset valve in the world?

OUR BRAND. The Vanessa triple offset valve was the first to provide bidirectional zero leakage* performance, creating a new industry category using a technology not previously available with other quarter turn valves. There are now over 300,000 Vanessa valves operating around the world. Our triple offset design completely…