Control valves are used in various industries. They are used to regulate pressure, temperature, flow and liquid level by fully or partially opening or closing in response to signals received from controllers .The Opening or closing of control valves is usually done automatically by electrical, hydraulic or pneumatic actuators.
Few types of control valves and their uses are given below
Ball Valve — Ball valves are used in situations where tight shut-off is required. They are wide duty valves, able to transfer gases, liquids and liquids with suspended solids.
Butterfly valve — A Butterfly Valve is used to control the flow of material through a circular pipe or tube. Typically the material is air, gas, steam, or liquid. Certain dry materials may also be handled through a butterfly valve.
Gate valve - Gate valves are designed to turn the flow of a liquid on or off by restricting or opening the flow with a round or rectangular wedge. Gate Valves can also control the pressure of liquid flow through pipes or valves.