In this video, Max explains ball valves and how to select the right one for your application.
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Video about sealing materials: [ Ссылка ]
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Hi I'm Max and today we're going to talk about ball valves!
A ball valve is a quarter turn valve that is typically used for on and off flow control. By means of rotating the ball, the inner bore closes or opens to allow the liquid or gas to flow through.
Ball valves have a long life and are very reliable, even if they haven't been used for some time. This makes them common and more popular than, for example, a butterfly valve or gate valve.
They are also very resistant to dirt, which means that they are used for a large number of applications. Manual control is by far the most common form of operation but electrical or pneumatic control with an actuator is also possible.
In this video we will talk about the design, construction and the various housing and sealing materials used in ball valves.
First, the design. A ball valve can have two, three or even four connection ports. Most ball valves are 2-way and operated with a manual lever. The lever control simply opens or closes the flow from the inlet to the outlet. 3-way ball valves usually have an L-shaped or T-shaped bore. This allows for different circuit functions, such as mixing, directing, or distributing flows. 4-way ball valves typically have 2 input ports and 2 output ports allowing 4-way flow control.
Second, the construction. A ball valve is constructed with one- two- or three-pieces. One-piece designs are the cheapest, the two parts that enclose the ball are pressed or welded against each other. Two-piece valves can be disassembled for repairs, cleaning, or inspection. Often, the two parts are screwed together. Three-piece valves are often clamped together via bolt joints and can easily be overhauled or thoroughly cleaned in the pipe itself. As a result, they are popular in, for example, the food industry and for sanitation applications.
The bore, or DN value, indicates the diameter of the bore in the ball. Ball valves with a maximum diameter are called full bore, and ones with a smaller diameter are called a reduced bore. A full bore means that you experience little to no pressure drop from inlet to outlet.
Finally, the materials that make a ball valve. The housing itself usually consists of brass, stainless steel or PVC. Brass is durable and suitable for most applications, but is prone to corrosion. Stainless steel is durable, inert and corrosion resistant but relatively expensive compared to brass. PVC is a lot cheaper and also corrosion resistant but can only be used up to a limited pressure.
PTFE (Teflon), NBR, FKM and EPDM are often used as sealing materials. We made a separate video about the different sealing materials, click the video over here or check out the description for more information!
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