Valves are important accessories for performing shut-off, regulating media flow, or changing the direction of media flow during operation of a pressure vessel. Commonly used valves are classified according to their structural forms: gate valves, globe valves, throttle valves, ball valves, butterfly valves, check valves, safety valves, pressure reducing valves, and plug valves. Valve fittings are an important part of the valve.
For example, in the globe valve, the main valve components are: valve stem, valve body, valve core and valve seat. The shut-off valve is a valve that opens and closes the passage by using a valve flap that moves down the center line of the valve seat. The main function in the pipeline is to cut off the fluid and also to regulate the throttle. The main advantage is that the friction between the sealing surfaces is smaller than that of the gate valve, the opening height is small, and there is only one sealing surface, which is easy to manufacture and repair.
In practical applications, a significant pressure drop occurs when fluid flows through the valve, and its sealing surface structure is relatively corrosion resistant and is typically used where throttling is required. The fluid flows up through the valve seat of the valve fitting. The deposit on the seat has a rigorous effect and is generally not used for fluids with suspended solids.www.dmgcastings.com