A valve is a controlling device from the system of fluid transport that has the different functions like controlling, cut-off, diversion, voltage-stabilizing, preventing reflux and so forth.

A valve, whether good or bad, depends on various parameters namely specialized datum. Therefore, it’s of great necessity to have a general idea for the valve’s main parameters. These technical data will be briefly introduced as follows:

What comes first is the valve’s strength property. Just as the name suggests, it describes the capacity of a valve to support the moderate pressure. It’s understood that the valve is a mechanical product that ought to bear the inner pressure.

A drive (which is also known as “หัวขับลม” in the Thai language  ) is a kind of adjustable-speed drive used in electro-mechanical drive systems to control AC motor speed and torque by varying motor input frequency and voltage.

Therefore it must have enough strength and rigidity so it won’t be broken or deform at a very long operation time.

Next, it’s the valve’s sealability, which is among the most significant technical indicators for performance. It describes the capacity to stop the leakage of this medium among different sealing components.

There are three sealing components for a valve: the touch place involving a part for closing and opening and two sealing faces of the chair; the mixing place one of filling substance, stem and gland box; the link between body and bonnet.

The leakage at the front place is known as internal leakage. It means that the valve doesn’t close firmly, which to a degree will impact the capacity of cutting off the medium.

For the stop valve, this sort of leakage isn’t allowed. In terms of the leakage in the latter two areas, it’s called external leakage, meaning that medium flow from the inside to outside.

The external leakage will cause material loss, environment pollution as well as the severe accident. It’s not allowed particularly for the explosive, poisonous or radioactive medium. Overall, the trustworthy sealability for a valve is of great significance.

The next one is fluid medium. After the medium passes the valve, it is going to lead to the pressure loss, meaning the valve has the immunity to the moderate flow.