The biggest difference between a two-way hard-to-hard seal butterfly valve and a conventional butterfly valve is that it has no requirement for the installation direction, that is, the direction of its input and output is uncertain. Ordinary butterfly valves are unidirectional and have a limited orientation. In addition, there is one more point to note about the installation of the two-way hard-to-hard seal butterfly valve, that is, it cannot be installed and used in places with too much pressure.
Why can't the two-way hard-to-hard seal butterfly valve be used in places with too much pressure? Now let's take a look at the reasons:
1.Because its valve plate is in a normally open state. The sealing ring fixed on the valve plate is multi-layered, that is, a multi-layer soft and hard stack sealing ring. In the normally open state, the medium forms a frontal flush on its sealing surface. If the pressure is too high, the soft sealing strip in the metal sheet is easily washed away to cause leakage.
2. At the same time, because the overall structure of the valve plate of the two-way hard-to-hard seal butterfly valve is generally thick, the flow resistance is also large. It is conceivable to install the flow resistance friction generated in a place with high pressure. This will cause a lot of damage to the sealing surface.
3. Because the product is a two-way seal, the product seal is mainly to press the valve plate against the valve seat by the torque of the transmission. If the pressure is higher, the seal is tighter. However, it should be in a positive flow state at this time. However, if the medium in the flow path is installed in a pipe with too much pressure when it is in a reverse flow state, it is easy to cause a positive pressure between the valve plate and the valve seat to be smaller than the medium pressure, and leakage occurs.
Two-way hard-to-hard seal butterfly valves have many advantages, including the following. It is not obstructed by forward and reverse pressure and can be reliably shut down. The two sealing surfaces of the sealing pair can be selected according to different hardnesses. It has an automatic alignment center function and can automatically compensate for wear and tear. In addition, a series of advantages such as small size, light weight, convenient transportation, installation, maintenance and repair, and reliable operation make the two-way hard-to-hard seal butterfly valve more and more popular in the market. If you have any relevant needs, please consult the Bundor Valve Company and purchase your suitable valve products.