I need to calculate the maximum water flow through a valve when the inlet pressure is 3 bar, pipe size is 22mm, valve connection size 15mm. However I do not know the pressure drop through the valve, it is a newly manufactured plastic valve with a solenoid shut off.
Bob S
water flow throgh a new valve?
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- Joined: Sat Sep 17, 2011 8:50 am
Re: water flow throgh a new valve?
Every valve has different pressure drop curve and it is not possible to know maximum flow if valve resistance coefficient K is not known.
Maximum possible flow through 15 mm orifice can be calculated and it is for 3 bar differential pressure of water using orifice plate calculator:
Orifice plate calculator
1. tube diameter (D1):
D1 : 25 mm
2. orifice diameter (D2):
D2 : 15 mm
3. pressure in front of orifice (p1):
p1 : 4.013 bar
4. pressure after orifice (p2):
p2 : 1.01325 bar
6. kinematic viscosity (ν):
ν : 1.006 mm2/s
8. density (ρ):
ρ : 1000 kg/m3
9. volume flow rate (q):
q : 170.76782 l/min
13. Reynolds number in front of orifice (ReD):
ReD : 144087.98
14. coefficient of discharge (C):
C : 0.6134395
Depending on the shape of valve, maximum flow rate will be lower or higher than calculated above.
Maximum possible flow through 15 mm orifice can be calculated and it is for 3 bar differential pressure of water using orifice plate calculator:
Orifice plate calculator
1. tube diameter (D1):
D1 : 25 mm
2. orifice diameter (D2):
D2 : 15 mm
3. pressure in front of orifice (p1):
p1 : 4.013 bar
4. pressure after orifice (p2):
p2 : 1.01325 bar
6. kinematic viscosity (ν):
ν : 1.006 mm2/s
8. density (ρ):
ρ : 1000 kg/m3
9. volume flow rate (q):
q : 170.76782 l/min
13. Reynolds number in front of orifice (ReD):
ReD : 144087.98
14. coefficient of discharge (C):
C : 0.6134395
Depending on the shape of valve, maximum flow rate will be lower or higher than calculated above.
Pipe flow calculations - free fluid flow calculators