What is concentric butterfly valve?

On a centric (concentric) butterfly valve the stem is centered in the middle of the disc and the disc centered in the bore. The eccentric butterfly valve has one or more stems (stub shafts) located offset from the center according to the categories of double and triple offset valves.

What is a double eccentric butterfly valve?

High Performance valves, also known as double eccentric butterfly valves have a stem which is mounted slightly out of the pipeline center and also behind the disc seat. This design leads to minimal wear and low operating torques. Double eccentric design.

Can you throttle butterfly valve?

Unlike gate valves, butterfly valves can be used for throttling or regulating flow as well as in the full open and fully closed position. The pressure loss through a butterfly valve is small in comparison with the gate valve.

Are butterfly valves good for isolation?

Butterfly valves offer true isolation and control capabilities in a single product. Designed for accurate flow and pressure control, they are ideal in applications where positive isolation is required.

What is difference between ball valve and butterfly valve?

Butterfly valves typically operate at a lower pressure (less than 50 bar) and temperature (less than 250 degrees Celsius). Flow regulation: Both valve types can be used for on/off control and proportional control, but ball valves are typically used for proportional due to better flow regulation.

Which type of valve is butterfly valve?

quarter-turn valves
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.

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. Triple offsets are generally used in applications similar to gate valves, where a metal seat is required, and tight shutoff and/or quarter turn actuation is desired.

What type of valve is a butterfly valve?

quarter-turn valve
Principle of Operation The butterfly valve is classified as a quarter-turn valve. It works like a ball valve for quick shutoff, but unlike a ball valve, the butterfly valve can also open and close incrementally. This difference means that the disc is always present in the flow and allows for a drop in pressure.

What is butterfly valve not suitable for?

Butterfly valves do have limitations that make them unsuitable for flow control in some applications. These include a limited pressure drop capability compared to globe ball valves with greater potential for cavitation or flashing.

Why do butterfly valves fail?

Butterfly valves are mostly used in various industries such as oil and gas plant. The primary failure modes for valves are the valve leaks to environment through flanges, seals on the valve body, valve stem packing not properly protected, over tightened packing nuts, the valve cracks and leaks over the seat.

Which is better butterfly or ball valve?

Do Butterfly Valves have a flow direction?

Butterfly valves can be bi-directional but do have a preferred flow direction, indicated on the body of the valve, It’s however strongly recommended to install the valves in the preferred flow direction, as it will extend the valve’s life span and will also lower the torque required to operator the valve.

What kind of valves do orbinox valves use?

ORBINOX offers a complete range of valves for dams, reservoirs and hydro solutions, including discharge fixed cone valves, bottom outlet bonneted gate, radial and roller gates, turbine protection butterfly valves and special engineered bonneted knife gate valves.

Which is pneumatic cylinder system does orbinox use?

ORBINOX has developed its own pneumatic cylinder range, both single acting and double acting, for our knife gate valves, penstocks / sluice gates and dampers. And also offers a comprehensive experience in valve automation and fail-safe systems with these pneumatic actuators.

What are the different types of orbinox dampers?

The ORBINOX damper product range for gas conduction, isolation and regulation mainly for the power generation, petrochemical, steel and marine industries, includes butterfly dampers, louvre dampers, multiple diverter dampers, guillotine dampers and goggle dampers.

What are the applications of the orbinox junk trap?

At the end of February our colleagues Juan Muruzabal and Asier Arrizabalaga travelled to Colombia to follow up on the operation of more than 260 penstocks. The ORBINOX Junk Trap solution is conceived for reject removal applications in the Pulp and Paper industry, such as pulpers, high consistency cleaners or with solid materials.