Valve Selection
The Valve Selection Method is based on some basic criteria.
1. Determine the Application Criteria
The very frequent operation of the valve may lead to slight leakages through gland packing. Tighten the eye bolt nuts equally on both sides to stop the leakage. This sequence should be repeated a few more times. After a period of time you may have to add one or two more glands packing in the stuffing box. To add the gland packing rotates the hand wheel in anti-clockwise direction in full open position. All gate and globe valves are provided with back seating arrangement in full open position. Remove the eye bolt nuts, lift the gland bush and gland flange in upward direction and add the required nos. of gland packing.
2. Determine the Valve Control Form Required
- Manual
- Pneumatic.
- Electrically Actuated
- Hydraulically Actuated
2. Determine the Valve Control Form Required
- Manual
- Pneumatic.
- Electrically Actuated
- Hydraulically Actuated
3. Determine the Required CV
In case of only flow Rate availability, CV calculation is required, but if the size of the valve is predetermined, then CV caculation is not required.
Paramenters for CV Calculaions:
- Inlet pressure
- Fluid temperature
- Fluid specific gravity
- Fluid flow rate in GPM (liquid) or Fluid flow rate in lbs./hr (steam)
