Utmost Flow Control Technology Co., Ltd.
Utmost Flow Control Technology Co., Ltd.

Function and Installation Method of the Butterfly Valve

Butterfly valve, also known as flap valve, is a simple structured regulating valve that can be used for switching and controlling low-pressure pipeline media. In Utmost wholesale butterfly valve, The butterfly valve refers to a valve with a closing element (valve disc or butterfly plate) as a disc, which rotates around the valve axis to achieve opening and closing.

Butterfly valve function

  • Convenient and rapid opening and closing, low fluid resistance, and can be operated frequently.

  • Simple structure, small size, short structure length, small volume, light weight, suitable for large-diameter valves.

  • Can transport mud, with minimum liquid accumulation at the pipeline mouth.

  • Good sealing performance under low pressure.

  • Good regulating performance.

  • When fully open, the effective flow area of the valve seat channel is large, and the fluid resistance is small.

  • Small opening and closing torque, due to the basic equal effect of the medium on both sides of the butterfly plate on the rotating shaft and the opposite direction of the torque generated, which makes it easier to open and close.

  • The sealing surface material is generally made of rubber, plastic, etc., and has good low-pressure sealing performance.

  • Butterfly valves are easy to install.

  • Flexible and labor-saving operation, manual, electric, pneumatic, and hydraulic methods can be selected.

Butterfly valve installation

The rubber elastomer in the butterfly valve will produce tearing, wear, aging, perforation, and even shedding during continuous use. The traditional hot vulcanization process is difficult to adapt to on-site repairs. Special equipment and a lot of thermal and electrical energy consumption are required for repairs, which is time-consuming and laborious. Nowadays, the method of using polymer composite materials to replace traditional methods is gradually adopted, and the most widely used is the Fosite Blue technology system. Its products have superior adhesion and excellent wear and tear resistance and tear resistance, ensuring that the repaired parts reach or even exceed the service life of new components and greatly shorten the downtime.

Installation and maintenance

  • When installing, the valve disc should stop at the closed position.

  • The opening position should be determined according to the rotation angle of the butterfly plate.

  • The butterfly valve with a bypass valve should open the bypass valve first before opening.

  • Installation should be carried out according to the manufacturer's installation instructions. For butterfly valves with large weight, a solid foundation should be set up.

Construction and installation points

  • The installation position, height, and inlet and outlet direction must meet the design requirements, and the connection must be firm and tight. All kinds of manual valves installed on insulated pipelines must have handles facing upwards.

  • Before installing the valve, an appearance inspection must be carried out, and the nameplate of the valve should conform to current national standards. For valves with a working pressure greater than 1.0 MPa and with a cutting-off function on the main pipeline, strength and tightness tests should be carried out before installation, and they can be used only after passing the tests. During the strength test, the test pressure is 1.5 times the nominal pressure, and the duration should be no less than 5 minutes. The valve body and filler should have no leakage to qualify. During the tightness test, the test pressure is 1.1 times the nominal pressure; the test pressure and test duration should meet the standard requirements, and the valve disc sealing surface should have no leakage to qualify.

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