31
Example:
• 70 GPM of water
• Inlet pressure 10 PSI
• Outlet pressure 3 PSI
Solution:
∆p = 10 PSI - 3 PSI = 7 PSI (See above)
MODULATING VALVE SIZING INSTRUCTIONS
p = Pressure Drop Across in PSI
(Inlet Pressure Minus Outlet Pressure)
PUMP
INLET @ 70 GPM
INLET PRESSURE 10 PSI
OUTLET PRESSURE 3 PSI
Use the formulas below to determine the correct
throttling valve for your application.
Inlet Pressure (10 PSI) minus Outlet Pressure (3 PSI)
(p) = 7 PSI
√
Formula for water and other products with a specific
gravity equal to 1.0:
√
Formula for water and other products with a specific
gravity other than water:
GPM = Product flow rate
SG = Specific gravity of gravity
∆p = Pressure Drop across valve in PSI
Once your Cv factor has been calculated, locate
your Cv factor on the charts from pages 2,3 or
5. Use the closest number to your figure. If you
find that your Cv factor is listed on more than one
chart, use the one that is closest to the optimum
operating point. (optimum operating point is when
the valve is 50% open).
FOR FURTHER ASSISTANCE SIZING A CONTROL VALVE FOR YOUR APPLICATION,
PLEASE CONTACT THE FACTORY.
MODULATING VALVES
√
70
7 PSI
1
=
26.45
To Next Page
Loading...
Need help?
General