Butterfly valve

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  • Gold
  • 3 Year

Butterfly valve


Operation is similar to that of a ball valve, which allows for quick shut off. Butterfly valves are generally favored because they cost less than other valve designs, and are lighter weight so they need less support. The disc is positioned in the center of the pipe. A rod passes through the disc to an actuator on the outside of the valve. Rotating the actuator turns the disc either parallel or perpendicular to the flow. Unlike a ball valve, the disc is always present within the flow, so it induces a pressure drop, even when open.

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. When the valve is fully open, the disc is rotated a quarter turn so that it allows an almost unrestricted passage of the fluid. The valve may also be opened incrementally to throttle flow.

There are different kinds of butterfly valves, each adapted for different pressures and different usage. 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). This creates a cam action during operation to lift the seat out of the seal resulting in less friction than is created in the zero offset design and decreases its tendency to wear. The valve best suited for high-pressure systems is the triple offset butterfly valve. In this valve the disc seat contact axis is offset, which acts to virtually eliminate sliding contact between disc and seat. In the case of triple offset valves the seat is made of metal so that it can be machined such as to achieve a bubble tight shut-off when in contact with the disc.

References=:=en.wikipedia.org

Hydraulic, Pneumatic and Electric Salar

  • Gold Company
  • Company registration date: -
  • Number of staff: 1-10 Person
  • Company activities: producer, Trading Company, Agents, Distributor and Wholesaler, Service company, Shop, Other
  • Place: Iran, Province East Azarbaijan
  • In the field of: Hydraulics and pneumatics
  • Company Type: Private

Salar Industrial Supplies Store by receiving pizzato electrrica and bonesi peneumatik
(Pizato micro switches have a one-year replacement warranty)
and cooperation with Turkish companies and Direct purchase from dealers
, Omron, ABB, Siemens, Bosch, General Electric, Schneider Electric, Honeywell, Phoenix Contact
Norgren AG, Bürkert, Turck, GEMÜ, Festo, SMC Corporation, Rexroth, Balluff, Sick AG
In the field of distribution of original goods, tries to provide original equipment for our dear and esteemed compatriots. 0102030405 "Tabriz, Qatran Railway, Kureh Bashi Railway, Civil Passage, Ground Floor, No. 15

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