Views: 28 Author: Site Editor Publish Time: 2019-05-09 Origin: www.fuchun-casting.com
As we know that valve is a device that regulates, directs or controls the flow of a fluid (gases, liquids, fluidized solids, or slurries ) by opening, closing, or partially obstructing various passageways. Technically,Valves are fittings, but are usually discussed as a separate category because of the wide range of applications and quite diverse of types. When the valve stays open, fluid flows in a direction from higher pressure to the lower.
The simplest, and very ancient, valve is a freely hinged flap. which drops to obstruct fluid (gas or liquid) flow in one direction, but is pushed open by flow in the opposite direction. This is called a check valve, as it prevents or "checks" the flow in one direction. Modern control valves may regulate pressure or flow downstream and operate on sophisticated automation systems.
Valves are used in a wide range of applications. Like controlling water for irrigation, processes in industrial uses, residential uses such as on/off and pressure control to dish and clothes washers and taps in civil use. Valves are also used in the military and transport sectors.Valves are instead called dampers in HVAC duct work and other near-atmospheric air flows. However, valves are used with the most common type being ball valves, in compressed air systems.
The main parts of the most usual type of valve are the body and the bonnet. These two parts form the casing that holds the fluid going through the valve.
According to he material, stainless steel, carbon steel, ductile cast iron, aluminum, High temperature copper as the main material of the valve. In many petroleum related applications where steel valves are normally used, ductile iron valves perform equally well. Above is mainly for the valve body material. Of course, different parts of the valve are made of different material.