There are several of control valves use in a project plant which are combined together to manufacture a finished product to be offered to sale. These are considered as industrial tools that help to regulate the fluid pressure and flow rate. These are designed in such a manner that they keep some process variable including temperature, level and flow etc in a required operating range just to ensure the end product's quality. They normally respond to the indication generated by sovereign campaign or independent devices like temperature measure or flow meters. Basically these are consists of a challengeable eye or gap that is open to increase flow rate or closes to decrease the flow rate.
Generally these are fitted with positioners and actuators. These can also work with hydraulic actuator which is also known as Automatic Control. These kinds of do not require external power source that means the fluid pressure is enough to open and close the valve. Flow control valves, pressure reducing valves, altitude valves, relief valves and back pressure sustaining valves are some examples of the automatic control valve. Because of its automatic opening and closing of valve feature it is known as Automatic Control.
In several systems like hydraulic circuit, the flow of fluid directly affects the actuator's function and therefore the actuators are controlled by the flow. Different types of control are available in the market, classified by a relationship between the valve stem position and flow rate through the valve such as ball, needle, diaphragm, butterfly valves and plug valves etc. One of the simplest control among all are Ball that are consist of merely of an inner ball which is attached to a handle. On the other hand butterfly valves give somehow similar results to ball valves with the internal and closing metal plate attached to a turning mechanism. The precise one is Needle valve that allows for greater flow control and use an adjustable needle with stem valve to restrict the fluid flow.
The main advantage of a is that it provides an inexpensive solution to several flow control concerns. In addition the basic flow control is not fully reliable because flow rate can change even the static valve position is given. This can be due to any of the factor like system temperature or pressure as well. Both the factors can be easily addressed in valve selection.
Carbon steel, zinc, brass, synthetics and stainless steel are some of the materials that can be used in the manufacturing of flow. These valves can be easily integrated in a wide variety of manual and automated systems, even also in existing control systems where they can be used to control the rate of compressed air and oil or virtually any other fluid. Control valve is the most common final control element in the process control industries that manipulates a flowing fluid including gas, steam, chemical compound, water or other fluid material.
