Pressure Loss Calculator - for Water & Similar Liquids

 

Step 1:

  Enter your flow rate in GPM:


Step 2:

  Enter Cv value from chart below:


    

Result:

 

Pressure Drop is: psi

 

 

This "calculator" is provided for comparison purposes only, and the resulting pressure drop can be dramatically different in actual field conditions.

Note that the pressure drop calculated above is based on liquid media with the specific gravity of water (1.0) and the viscosity of water (1.0 centistoke). Even if your liquid has the same properties as water, other factors can impact the actual pressure drop.

The results above and the formulas provided by Plast-O-Matic Valves, Inc. are offered only for comparing the characteristics of thermoplastic valves, and are not for determining actual performance or for system design.

 

If you would like to determine other aspects of the pressure drop equation, for instance: What is the minimum Cv that will result in no more than a 10 psi pressure drop at 20 GPM? or, for instance, How much flow do I need to have less than 3 psi pressure drop with a .8 Cv?, your best bet is to use the actual formulas, which are shown here, or described in detail on our pressure loss and flow equation page. Even if you have used the calculator above, you will likely find the information on this link helpful.

Copyright© Plast-O-Matic Valves, Inc. 2002


Cv Factors Table Entries

AIR SHUT-OFF VALVES & DIAPHRAGM VALVES
BLT Series Shutoff Valves    
Part Number Size Cv Factor
BLT050 ½" 3.6
BSD/BSDA Series Compact Valves    
Part Number Size Cv Factor
BSD025 ¼" 1.1
BSD050 ½" 3.4
BSD075 ¾" 5.8
BSD100 1" 6.3
BSD150 1½" 17.0
Part Number Size Cv Factor
BSDA025 ¼" 1.1
BSDA050 ½" 3.4
BSDA075 ¾" 5.8
BSDA100 1" 6.3
BSDA150 1½" 17.0
BSR Series Balanced Shutoff Valves    
Part Number Size Cv Factor
BSR050 ½" 3.0
BSR075 ¾" 8.0
BST Series Shutoff Valves    
Part Number Size Cv Factor
BST050 ½" 3.6
EAT/ELT/EST Series Shutoff Valves    
Part Number Size Cv Factor
EAT075 ¾" 8.5
EAT100 1" 15.0
EAT125 1¼" 24.0
EAT150 1½" 33.0
EAT200 2 60.0
Part Number Size Cv Factor
ELT075 ¾" 8.5
ELT100 1" 15.0
ELT125 1¼" 24.0
ELT150 1½" 33.0
ELT200 2 60.0
Part Number Size Cv Factor
EST075NC ¾" 8.5
EST100NC 1" 15.0
EST125NC 1¼" 24.0
EST150NC 1½" 33.0
EST200NC 2 60.0

 

DIVERTER VALVES
(See also 3-way Ball Valves and 3-way Solenoid Valves)
BFS Series -- NORMALLY OPEN    
Part Number Size Cv Factor
BFS050 ½" 3.6
BFS Series -- NORMALLY CLOSED    
Part Number Size Cv Factor
BFS050 ½" 2.5
F Series -- NORMALLY OPEN    
Part Number Size Cv Factor
F075 ¾" 12.2
F100 1" 19.2
F125 1¼" 34.5
F150 1½" 47.5
F200 2 79.0
F Series -- NORMALLY CLOSED    
Part Number Size Cv Factor
F075 ¾" 7.3
F100 1" 11.5
F125 1¼" 20.7
F150 1½" 28.5
F200 2 47.5
TUCA Series -- Compact 3-way (Diverter) Valves    
Part Number Size Cv Factor
TUCA025V ¼" 0.4
TUCA050V ½" 0.4

 

GAUGE GUARDS
Series GGMU, Ultra-Pure Gauge Guard    
Part Number Size Cv Factor
GGMUV050 ½" 10.0
GGMUV075 ¾" 20.0
GGMUV100 1" 40.0
GGMUV150 1½" 100.0
GGMUV200 2 120.0

 

BALL VALVES
2-way Ball Valves, including all actuated versions    
Part Number Size Cv Factor
MBV050 ½" 10.0
MBV075 ¾" 20.0
MBV100 1" 40.0
MBV125 1¼" 80.0
MBV150 1½" 100.0
MBV200 2 120.0
3-way Ball Valves, including all actuated versions    
Part Number Size Cv Factor
TMBV050 ½" 4.0
TMBV075 ¾" 8.0
TMBV100 1" 13.0
TMBV150 1½" 38.0
TMBV200 2 39.0

 

MANUAL SHUT-OFF VALVES
MFR Series    
Part Number Size Cv Factor
MFR050 ½" 3.0
MFR075 ¾" 8.0

 

SOLENOID VALVES
EASYM/EASM with AC COILS    
Part Number Size Cv Factor
EASYM2V8W20 ¼" 1.1
EASYM4V8W20 ½" 1.1
EASM4V12W20 ½" 2.1
EASM5V16W20 ¾" 3.1
EASM6V22W20 1" 5.5
EASM4V12G58 ½" 2.3
EASM5V16G58 ¾" 3.4
EASM6V22G58 1" 6.2
EASYM/EASM with DC COILS    
Part Number Size Cv Factor
EASYM2V8W20 ¼" 1.1
EASYM4V8W20 ½" 1.1
EASM4V12W20 ½" 1.6
EASM5V16W20 ¾" 2.2
EASM6V22W20 1" 4.0
EASYMD/EASMD with AC COILS    
Part Number Size Cv Factor
EASYMD2EP14W20 ¼" 1.1
EASYMD4EP14W20 ½" 1.1
EASMD4EP14W20 ½" 2.3
EASMD5EP16W20 ¾" 3.1
EASMD6EP22W20 1" 5.5
EASMD4EP14G58 ½" 2.3
EASMD5EP16G58 ¾" 3.1
EASMD6EP22G58 1" 5.5
EASYMD/EASMD with DC COILS    
Part Number Size Cv Factor
EASYMD2EP14W20 ¼" 1.1
EASYMD4EP14W20 ½" 1.1
EASMD4EP14W20 ½" 1.8
EASMD5EP16W20 ¾" 2.2
EASMD6EP22W20 1" 4.0
EASYMT/EASMT PTFE Bellows with AC COILS    
Part Number Size Cv Factor
EASYMT2V12W20 ¼" 1.1
EASYMT4V12W20 ½" 1.1
EASMT4V12W20 ½" 2.1
EASMT5V16W20 ¾" 3.1
EASMT6V22W20 1" 4.6
EASMT6V14W20 1" 3.6
EASMT4V12G58 ½" 2.3
EASMT5V16G58 ¾" 3.4
EASMT6V22G58 1" 4.7
EASYMT/EASMT PTFE Bellows with DC COILS    
Part Number Size Cv Factor
EASYMT2V12W20 ¼" 1.1
EASYMT4V12W20 ½" 1.1
EASMT4V12W20 ½" 1.6
EASMT5V16W20 ¾" 2.2
EASMT6V22W20 1" 4.0
EASMT6V14W20 1" 2.9
EASMT4V12G58 ½" N/A
EASMT5V16G58 ¾" N/A
EASMT6V22G58 1" N/A
EAST Compact PTFE Bellows Valves    
Part Number Size Cv Factor
EAST2V6W11 ¼" 0.5
EAST2V8W11 ¼" 0.8
EAST4V6W11 ½" 0.5
EAST4V8W11 ½" 0.8
EAST-NO Normally Open Solenoid Valves    
Part Number Size Cv Factor
EASY2B8W20-NO ¼" 1.1
EASY4B8W20-NO ½" 1.1
PS Series Pilot-Operated/PTFE Bellows Solenoid Valves    
Part Number Size Cv Factor
PS050 ½" 5.2
PS075 ¾" 7.60
PS100 1" 9.5
PS150 1½" 28.0
PS200 2" 35.0
PS300 3" 80.0
THP Series 3-Way Solenoid Valves    
Part Number Size Cv Factor
THP2V4W20 ¼" 0.31
THP4V4W20 ½" 0.31
THP2V6W20 ¼" 0.52
THP4V6W20 ½" 0.52
THP2V8W20 ¼" 0.61
THP4V8W20 ½" 0.61
TUC Series 3-Way Solenoid Valves    
Part Number Size Cv Factor
TUC2V3W20-PV ¼" 0.22
TUC4V3W20-PV ½" 0.22
TUC2V4W20-PV ¼" 0.31
TUC4V4W20-PV ½" 0.31

TUC2V8W20-PV

¼" 0.40
TUC4V8W20-PV ½" 0.40
WC Series Wetted Core Solenoid Valves    
Part Number Size Cv Factor
WC4V6W11-PP ½" 0.40

Plast-O-Matic Valves, Inc.
1384 Pompton Avenue
Cedar Grove, NJ 07009-1095 USA

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Copyright© 2002 Plast-O-Matic Valves, Inc.