Chapter 13 Control Valves and Regulators PDF

## Chapter 13 Control Valves and Regulators 1. The most common final control element in a closed control loop is the control Valve. 2. Control valves are generally designed to fail in an open, closed or (fail in place/stationary) position. In a word; what determines the failure position? Spring. 3...

## Chapter 13 Control Valves and Regulators 1. The most common final control element in a closed control loop is the control Valve. 2. Control valves are generally designed to fail in an open, closed or (fail in place/stationary) position. In a word; what determines the failure position? Spring. 3. Most control valves are "air operated". When would hydraulic piston type actuators be necessary? Higher pressure. 4. The part of a control valve that converts a mA signal to a pneumatic signal is called a transducer. 5. What is the function of the valve positioner indicates how much - correct position. valve is open... 6. The valve positioner come equipped with what 3 gauges: instrument (in) & system air/supply. 7. True False A handwheel can override the positioner. 8. True False A 3 way valve is designed for mixing (two flow streams) or diverting one flow stream in 2 directions. 9. Which type of control valve design provide for greater flows? * globe * butterfly * ball type 10. What's the purpose of an instrument air regulator controls come pressure, by reducing air? 11. What's the function of a spring inside a control valve provides energy to open/close a valve. When you loose power. 12. What's the difference between a back pressure regulator and a pressure reducing regulator? Back pressure controls pressure upstream Pressure reducing controls pressure downstream.