Workers in Shanghai to open the valve is a professional valve manufacturer, main products are gate valve, high pressure valve, ball valve, globe valve, engineers Jieyou decades of professional experience, I will introduce today is the gate Path contraction:
If a channel diameter of the valve body is different (and often are the valve seat at the flange diameter is smaller than the diameter), called the path contraction. Path shrink parts sizes shrink, open and close the required power is reduced, at the same time expand the scope of application components. However, the path contraction. Fluid resistance loss increases. In some sectors certain operating conditions (such as the petroleum sector, pipeline), not allowed to use the path contraction of the valve. This aspect is to reduce the pipeline pressure loss, the other is to avoid the path contraction obstacle to the mechanical cleaning pipelines.