What is a double offset butterfly valve?

Double offset butterfly valve is popularly known as a high-performance butterfly valve and has two offsets from the valve body’s center: The shaft axis is offset from the disc’s seat and body seal’s centerline, and. The shaft axis is eccentric to the pipeline’s/valve’s center line.

Is Double offset butterfly valve bidirectional?

CAMTECH Double Offset Butterfly Valve is design offers rugged reliability and extremely easy maintenance in the field. These valves are Bi-directional with zero leak features. Resilient seat design also can achieve low torque which is easy for operation.

How does a triple offset 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.

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 the difference between double offset and triple offset butterfly valves?

The offset is in centerline of the valve where it becomes the axis of the seat cone angle….Difference between the Double Offset and Triple Offset Butterfly Valve.

Description	Double Offset Butterfly Valve	Triple Offset Butterfly Valve
Class Rating	600	600

What is double eccentric butterfly valves?

AVK double eccentric butterfly valves are designed with tilted disc for easy operation. The disc seal is made of AVK’s drinking water approved EPDM rubber featuring an excellent compression set and thus ability to regain its original shape. The valves are suitable for bi-directional application.

What is double eccentric?

Double eccentric butterfly valves, also known as high-performance butterfly valves, have the shaft mounted slightly offset from the pipe centerline, and the shaft is mounted behind the sealing band of the seat. The seat is a narrow resilient band, clamped in the body and must be resilient.

What is double and triple offset butterfly valve?

You would find triple offset butterfly valves in applications such as steam with over 150 psi or high-temperature pure gas or liquid. In cases like these, the metal seat types without the soft coating are more economical.

Why use a high performance butterfly valve?

High performance butterfly valves can be used for shutoff and throttling control. They are designed to handle everything from general applications to viscous and corrosive liquids; corrosive gases and steam. Seats for dirty, viscous services. Fire safe seats – designed for fire safe applications.

What is offset valve?

Zero offset butterfly valves are used for liquid and gas applications up to 400 degrees Fahrenheit and 250 PSI. The stem and disc of these valves are centered in the valve seat which is centered in the body of the valve. This valve can handle chemicals, coatings, food, some solids, and abrasive applications.

What are the advantages of triple offset butterfly valves?

The triple offset butterfly valve has a low torque so there is no need to have larger valves. That being said, this means higher savings costs. This valve has zero leakage closure on both ends. The introduction of soft seats increases the value of the valves.

What is the difference between the double offset and triple offset?

The double offset is up to ANSI Class 600 rating in carbon steel, stainless steel, Hastelloy and other body material, with variations of Teflon seats and also Fire Safe design with metal back up seats. With the triple offset butterfly valve there are three offsets.

Can positive shut-off be achieved with butterfly valves?

Positive shut-off cannot be achieved with butterfly valves. However, the recent usage of latest polymers and increased temperature ratings has made it possible to develop butterfly valves with bubble-tight closure. The butterfly valve working principle revolves around a flat, round plate that is placed in the middle of the pipe.

What is a high performance butterfly valve?

This popular valve is also known as a high performance butterfly valve. This valve has two stems offset from the center. This creates a cam action during the application’s process.