How does a triple offset butterfly valve 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 sealing components are each machined into an offset conical profile resulting in a right-angled cone.
Why use a triple offset butterfly valve?
Triple Offset Butterfly Valve This cone angle, along with the two eccentric shaft offsets, allows the disc to seal against the seat with no friction. This seat design also allows for uniform sealing, and thus a tight shutoff in a metal seat design.
What is the working mechanism of a butterfly valve?
A butterfly valve is from a family of valves called quarter-turn valves. When the valve is closed, the disc is turned so that it completely blocks off the passageway. When the valve is fully open, the disc is rotated a quarter turn so that it allows an almost unrestricted passage of the fluid.
What is triple eccentric butterfly valve?
Triple offset butterfly valves (TOV) have three separate offsets as shown in the picture above to the right. Two offsets are placed from the center while the third is on the seating surface which creates a cone type shape of the disc and seat.
What is high performance type 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 double offset butterfly valve?
Also known as high-performance butterfly valves, double-offset valves feature two offset stems that offer especially long life due to reduced contact between valve discs and seats. This type of valve can be especially helpful if your operations involve higher pressures and particulate fluids.
What is the purpose of butterfly valve?
A Butterfly valve is a quarter-turn rotational motion valve, that is used to stop, regulate, and start flow. A butterfly valve has a disc which is mounted on a rotating shaft. When the butterfly valve is fully closed, the disk completely blocks the line.
Why use a high performance butterfly valve?
For throttling control applications, one type of butterfly valve is now the industry standard: high performance butterfly valves (HPBVs) or double offset valves. Their advantages include a straight-through flow path, very high capacity, and ability to pass solids and viscous media.
Should water valves be fully open?
Similar to gate valves, ball valves should be all the way open to allow the full flow of water or all the way closed to restrict all water from flowing. If the lever is perpendicular to the pipe, water will not flow.
What is a triple offset valve (Tov)?
What is a Triple Offset Butterfly Valve Also known as the triple eccentric valve, the triple offset valve (TOV) has been around for more than 50 years. Initially designed to service water applications as a shutoff valve, TOV is now considered as a top choice for many critical process applications.
What is a triple eccentric butterfly valve?
A Triple Eccentric Butterfly Valves is a Valves that isolates or controls the flow of a fluid. The closing mechanism is a disk that rotates Its operation is similar to that of a Butterfly Valve, which allows for quick shut off.
What is a triple offset valve?
A triple offset valve is a torque‐seated valve. In addition to the standard components, the TOV has three offsets. Seats are made of a laminate of metal and graphite and are commonly field replaceable. This valve does not act like a normal butterfly valve that is seated by positioning the disc using a lever, gear or body stop.