How does flanged butterfly valve work?

The opening and closing part of the flanged butterfly valve is a flange. The movement direction of the flange is perpendicular to the direction of the fluid. The flanged butterfly valve can only be fully opened and fully closed and cannot be adjusted or throttled. The flange butterfly valve has two sealing surfaces. The two sealing surfaces of the most commonly used flanged butterfly valve form a wedge. The wedge angle varies with valve parameters when the medium temperature is not high.

What are the general requirements for flanged butterfly valve?

How does flanged butterfly valve work?

What occasions is flanged butterfly valve suitable for?

What are the general requirements for flanged butterfly valve?

Usually there is a trapezoidal thread on the lifting rod, through the nut on the top of the flanged butterfly valve and the guide groove on the flanged butterfly valve body. The rotary motion is changed into linear motion, that is, the operating torque is turned into operating thrust. When the flanged butterfly valve is opened and the lifting height of the flange is equal to the valve diameter, the fluid passage is completely unblocked. But this position cannot be monitored during operation. In actual use, the apex of the flanged butterfly valve stem is used as a mark, that is, the position where it cannot be opened, as its fully open position.

The specifications and categories of flanged butterfly valves should meet the requirements of the pipeline design documents.

The model of the flanged butterfly valve should be marked with the national standard number requirement. If it is a corporate standard, the relevant description of the model should be indicated.

The manufacturing standard of flanged butterfly valve should state the national standard number on which it is based. If it is a corporate standard, the purchase contract should be accompanied by corporate documents. The flanged butterfly valve should generally be installed horizontally in the pipeline.

How does flanged butterfly valve work?

The flanged butterfly valve operates based on the quick shut off principle. The circular disc (butterfly) of the flanged butterfly valve is placed in the center of the pipe which allows a rod to go through it to an actuator, on the outer side of the flanged butterfly valve. Using the handwheel, the metal disc is rotated to keep the disc parallel or perpendicular to the flow and it allows or closes the flow. So, the operating principle of the flanged butterfly valves is fairly simple.

The flanged butterfly valve is one of the few industrial valves that are both efficient in isolating and regulating the flow of media. The flanged butterfly valve is also quick to open. The disc is attached to the stem, either through the former or the stem is at the back of the disc. The stem is attached to the handle that is either placed on top of the body or at its side.

The disc of flanged butterfly valve is thin in the middle. Together with the seat, it seals off the flow of media when the flanged butterfly valve is used for isolation. For the control of flow, the disc moves to partially open or close, allowing a certain amount to pass through.

What occasions is flanged butterfly valve suitable for?

Flanged butterfly valves are also widely used in petroleum, chemical, thermal power plants and other oil products. Flanged butterfly valve is used in the water and steam pipelines in order to achieve the purpose of connecting or blocking the circulating medium.

Flanged butterfly valves are used in a number of applications for industrial sectors that include food processing, pharmaceutical, chemical, oil, water as well as waste water management. Flanged butterfly valves for the most part have replaced ball valves in a lot of industries. This is especially the case for those dealing with petroleum because flanged butterfly valves are less expensive and easy to install. It's important to note that pipelines that contain flanged butterfly valves cannot be pigged for cleaning.

When the flanged butterfly valve is used under special conditions such as throttling adjustment, strict sealing requirements, severe wear, and low temperature, the triple-eccentric or double-eccentric butterfly valve needs a specially designed metal sealing belt adjustment device.

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