Main Factors of Valve Selection Function and Piping System
| Function and service considerations |
|
| Selection |
| Valves serve the purpose of controlling the fuids in building services piping.Nalves are produced in avariety of design types and materials. |
| Proper selection is important to ensure the most efficient,cost-effective and long-lasting systems. |
|
| Function |
| Valves are designed to perform four principal functions: |
| 1.Starting and stopping the flow |
| 2.Regulating (throttling) the flow |
| 3. Preventing reversal of the flow |
| 4.Regulating or relieving the pressure of the flow |
|
| Service Considerations |
| 1. Pressure |
| 2.Temperature |
| 3. Type of fluid |
| a) Liquid |
| b)Gas; i.e., steam or air |
| c) Dirty or abrasive (erosive) |
| d) Corrosive |
| 4. Flow |
| a) On-off throttling |
| b)Need to prevent flow reversal |
| c) Concern for pressure dropd) velocity |
| 5. Operating conditions |
| a) Condensation |
| b)Frequency of operation |
| c)Accessibility |
| d) Overall sizelspace available |
| e) Manual or automated control |
| f) Need for bubble-tight shut-off |