Section Vb1: Valves - Johnson Controls

← Back to document page

Valve and Actuator Manual 977Valve Basics and Sizing Information SectionEngineering Data Book Vb1Issue Date 0294 1994 Johnson Controls , No. LIT-347VbControl ValvesPage 3Valve Components3Valve Parameters5 Valve Flow Characteristic5 Pressure Shift at Valve6 Valve Gain7 Valve Plugs8 Rangeability9 Cavitation10Coil Theory13 Water Coils13 Steam Coils14Valve Sizing16 Valve Flow Coefficient16 Pressure Drop Across the Valve17 Sizing Water Valves18 Examples18 Solutions Other Than Water19 Sizing Steam Valves20 Examples22 Gases Other Than Steam23Three Way Valves23Valve Selection Summary25Maximum Temperature and Pressure Ratings29Glossary30Section Vb1.

Determine the uncontrollable flow rate through a 6 in. globe valve where Cv equals 350 and rangeability equals 10.4:1. Assume the full flow (wide open) differential pressure across the valve equals 5 psig. It should be noted that in reality the pressure drop across a control valve will normally rise due to pressure shifts within the hydronic ...

  Valves, Globe, Globe valves