Predicting flow through control valves

References Part 3

The chapter focuses on the orifice sizing for liquid and gas flows, and controlling valve design for liquid, vapor, steam services, and two-phase flow An orifice or a nozzle is usually sized for known flow rate and pressure drop Nozzles and orifices are used to restrict the flow of fluids Thus, a reduction in a cross-sectional area can cause significant changes in the pressure and temperature of a compressible fluid as it flows through the constriction The magnitude of the change depends on the linear velocity of the fluid or the Mach number at the constriction An orifice is usually designed to develop full-scale pressure differential at maximum flow Relief valve sizing for vapor, steam, liquid, air, and fire conditions are discussed in the chapter Safety relief valves serve as a valuable function in protecting against overpressure of pipework and process equipment This may occur because of operational malfunctions, such as equipment failure, fire, or human error Proper sizing of a relief system is therefore essential This requires the determination of proper relieving conditions so that relief valves and their associated pipework can be properly sized for the worst scenario

Predicting flow through control valves

Citations

References Part 3

CHAPTER 5 – Instrument Sizing

Related Papers (5)

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Maximum Pressure Head Due to Linear Valve Closure