What is a butterfly valve, how many types and what are the components?

What is a butterfly valve?

Butterfly Valve is a device used for opening/closing 0-90 degrees, also known as Quarter turn valve (Quarter Turn Valve) makes it possible to adjust the fluid flow rate to be slow or fast. and easy to maintain The butterfly valve is used to control the flow of various types of liquids and gases. to the industrial system Various types of construction works such as sewerage systems air conditioning system or chemical delivery work etc. Butterfly valves are also light in weight compared to other types of valves. They are durable and do not require much maintenance. And butterfly valves are available in a variety of applications. Each format will have different features for use. Therefore, butterfly valves should be selected to suit the type of work. for controlling the flow rate of various systems efficiently

butterfly valve components

Stem is the part of the core or stem used to turn a very strong valve.

It is a locking ring that is installed between the groove of the stem and the locking body to prevent the stem from being pushed out of pressure.

It is a stem body installation that makes it easy to adjust the hex nut without removing the actuator.

The seal is inserted through the hole of the rod. so that no liquid or gas can flow through

Bearings support mechanical loads. It has excellent resistance to corrosion and distortion from high temperatures.

Designed to prevent tongue movement and reduce possible seat damage. thus extending the service life of the seat

The tongue acts as a water barrier or when it is opened. The tongue is designed to allow the water to flow well. Usually made of stainless steel.

The retainer is secured with bolts outside the sealing area. to protect bolts from corrosion

Types of throttle valves

Wafer Type Butterfly Valve

Wafer type butterfly valve is popular in the market, inexpensive, the nature of this type of valve does not have a bolt hole or bolt hole, can be used with all Standard Flange types, whether ASA, DIN or SIS. wafer type butterfly valve It uses the compressive strength of the pipe flanges on both sides to hold the valve body. The disadvantage is that it cannot be installed as an end of line (installation at the end of the pipe line).

Lug Type Butterfly Valve

Lug Type Butterfly Valve The structure of the valve body is distinctive in that the flange has 8 holes drilled around the thread, which can be installed to join the pipe on both sides or only the end of the pipe. And it can also block the flow of the other side of the pipe. This makes it possible to quickly control the flow of liquids and gases. But it is not suitable for work that adjusts the flow rate very finely. Therefore, it is commonly used to control the flow rate in various industrial applications. together a lot

Double Flange Type Butterfly Valve

Double Flange Type Butterfly Valve The structure of the body, the seat contact and the valve body are connected without pins. And also has a stem shell on both the top and bottom that is resistant to wear and abrasion. This reduces fluid resistance and is easier to maintain than other types of butterfly valves. therefore suitable for ship work laboratory or general industrial work