Control Valve question and answers
Control Valve question and answers 1. What is control valve? A power operated device used to modify the fluid flow rate in a process control system. It usually consists of a body or valve and an actuator, which responds to a signal from the controlling system and changes the position of a flow controlling element in the valve. 2. Can two control valves be used in series in high pressure drop applications? Dropping the pressure across two valves rather than one is theoretically better. However, in practice, the two valves will not usually control well together unless the process can operate with a very low proportional band with slow response times. A better and usually less expensive approach is to use a valve that is designed with multiple pressure drop restrictions inside the trim. 3. What is the valve seat? The valve seat is that the apron for an outlined flow through opening within the valve through that the medium to be regulated needs to flow. 4. What is the valve cone? The valv