Generally, valves are devices used to control the flow of gases or liquids through a closed tube or pipe system. Flow-through a valve can be relatively unobstructed when it is completely open. Flow stops when the valve is completely closed.

A ball valve consists of a valve body with a rotating ball in it. This ball or sphere has a hole or bore through its center. The handle on a ball valve opens the valve when it turns the ball to align with the pipe or tube so that it is pointing in the same direction as the pipe. This allows the flow to pass through it. The valve handle can also turn the ball so that the bore is at a right angle or 90 degrees to the flow. This closes the ball valve.



As it is difficult to know how do you define perfect quality, we want you to know what to look for as follows:

It is necessary to have the right test certificates and materials.

1. Some applications need a particularly high grade of stainless steel or certificates. 

2. What is very important is the seal. The seal, usually, PTFE, is one vital element determining the pressure it can withstand at the corresponding temperature. 

3. You may always want to check how heavy the item is. A heavier valve is usually made of more materials that finally show stability and high quality.

4. Another thing we recommend checking for is whether the ball within the valve is hollow. This is a new way for manufacturers to cut costs.

5. In the end you need to check how easy it is to open the valve. It shouldn't be too easy or too hard. 

Xiamen Dervos is an API-Certified valve manufacturing and trading company that specializes in the production of various kinds of valves. In addition to all kinds of common valves such as gate valves, ball valves, globe valves, plug valves and butterfly valves, we also offer you the best actuators as long as our customers file their requirements.

To learn more about our industry-leading products, contact us today.