Double offset butterfly valve

A triple offset butterfly valve is used in similar industries to those in which double offset valves would be used but are even more effective in demanding and tight applications. The TOV’s that offer the valve with the seat in the body vs seat on disc edge would last longer in abrasive applications. The triple offset butterfly valve can also have double seat type design, that is, an elastomeric or graphite material covers a stainless steel seat. Double offset butterfly valves are available in higher pressures than the zero offset style. Much the same as the Double Offset butterfly valve that has balances, this triple counterbalance additionally has the same counterbalance aside from it has one extra counterbalance which is a funnel shaped shape seat.

These valves are Bi-directional with zero leak features.

Butterfly valves are a quick open type. Resilient seat design also can achieve low torque which is easy for operation. The butterfly valve shall be designed expressly for waterworks applications and shall be of the double offset design. Zero and single offset butterfly valve designs are not acceptable.

Valves shall be of the size and class indicated in the Valve Schedule. The valve design is based on a double eccentric geometry of the disc rotating centre, utilizing a floating radius machined seal ring. This design makes the disc move back and away from the body seat during the opening movement.

What is the function of a butterfly valve? When to use a butterfly valve or ball valve?

Lowest Prices - Industrial Valve s. Water Valve s - Low Prices, Buy Now. Applications of double - offset butterfly valves Thanks to their safety of operation, their design strength and corrosion resistance, double - offset butterfly valves made by VAG can be used in almost any application, both as buried valves and as parts of a plant. In some applications, bubble-tight shut off cannot be achieved using double offset butterfly valves. Some applications do not lend themselves well to traditional butterfly valves , for example applications involving harsh chemicals or media with.

The double - offset structure features in the stem center deviated from both the centers of the disc and valve. The zero- offset butterfly valve , which uses the flexibility of rubber, has the lowest pressure rating. The high-performance double offset butterfly valve , used in slightly higher-pressure systems, is offset from the centre line of the disc seat and body seal ( offset one), and the centre line of the bore ( offset two).

Call Us Today For Ordering Info! The double-offset butterfly valve is a valve that has offset compare with the concentric butterfly valve. The first offset is the shaft located not in the center of the disk but located on slightly behind the disc. This offset will make the valve has a continuous sealing surface on the disc. But in the case of double offset butterfly valve , due to geometry, drastic change in behavior is observed by reversing the flow direction from seat side flow to shaft side flow.

Why Use a Triple ­ Offset Valve ? Triple-offset butterfly valves offer the best sealing and longest life of all butterfly valve designs. Here are some of the reasons they are chosen: For the harsh conditions of critical process applications, steam isolation and temperature extremes, TOVs provide performance reliability and quality. In this configuration, the disc is eccentric, or offset , from the valve seat.

As the disc starts to rotate, it moves away from the seat instead of across it.

The double offset butterfly valve , normally used in higher pressure or higher temperature applications. Free Shipping Available On Many Items. Check Out Top Brands On eBay.