You should know 15 specific data before you ordering the control valves
Nov 02, 2015
When ordering, please specify:
|1. Nominal size × Port size||9. Special requirement of decreasing, copper free treatment, and etc.|
|2. Type and rating of end connections||10. Name of flow medium|
|3. Body and trim material, necessity of hardening||11. Normal flow and maximum required flow|
|4. Type of bonnet||12. Pressure of flow medium, upstream and downstream|
|5. Valve and plug characteristics||13. Pressure at maximum and minimum, required flow|
|6. Type of actuator, air pressure to diaphragm||14. Temperature and specific gravity of flow medium|
|7. Valve action (direct or reverse)||15. Viscosity of flow medium, inclusive or exclusive of slurry|
|8. Accessories (positioner, hand wheel, pressure regulator with filter and etc.)|
THE PROCESS OF SELECTION CONTROL VALVE
DETERMINE SERVICE CONDITIONS
CALCULATE PRELIMINARY Cv REQUIRED•Check noise and cavitation levels
SELECT TRIM TYPE
•If no noise or cavitation indication, choose standard trim.
•If aerodynamic noise is high or liquid noise is cavitation is indicated, choose specific trim.
SELECT VALVE BODY AND TRIM SIZE
• Select valve body and trim size with required Cv.
•Note travel, trim group, and shut off options.
SELECT TRIM MATERIALS
Select trim materials for your application; make sure trim selected is available in the trim group for the valve size selected.
Consider options on shutoff, stem packing, Etc.
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