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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.

formulas for calculating flow and pressure drop

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 NumberSize Cv Factor
BLT050 ½"3.6
BSD/BSDA Series Compact Valves
Part NumberSizeCv Factor
BSD025¼"1.1
BSD050 ½"3.4
BSD075 ¾"5.8
BSD1001"6.3
BSD1501½"17.0
Part NumberSizeCv Factor
BSDA025¼"1.1
BSDA050½"3.4
BSDA075¾"5.8
BSDA1001"6.3
BSDA1501½"17.0
BSR Series Balanced Shutoff Valves
Part NumberSizeCv Factor
BSR050½"3.0
BSR075¾"8.0
BST Series Shutoff Valves
Part NumberSizeCv Factor
BST050½"3.6
EAT/ELT/EST Series Shutoff Valves
Part NumberSizeCv Factor
EAT075¾"8.5
EAT1001"15.0
EAT1251¼"24.0
EAT1501½"33.0
EAT200260.0
Part NumberSizeCv Factor
ELT075¾"8.5
ELT1001"15.0
ELT1251¼"24.0
ELT1501½"33.0
ELT200260.0
Part NumberSizeCv Factor
EST075NC¾"8.5
EST100NC1"15.0
EST125NC1¼"24.0
EST150NC1½"33.0
EST200NC260.0

DIVERTER VALVES
(See also 3-way Ball Valves and 3-way Solenoid Valves)
BFS Series -- NORMALLY OPEN
Part NumberSize Cv Factor
BFS050 ½"3.6
BFS Series -- NORMALLY CLOSED
Part NumberSize Cv Factor
BFS050 ½"2.5
F Series -- NORMALLY OPEN
Part NumberSizeCv Factor
F075¾"12.2
F1001"19.2
F1251¼"34.5
F1501½"47.5
F200279.0
F Series -- NORMALLY CLOSED
Part NumberSizeCv Factor
F075¾"7.3
F1001"11.5
F1251¼"20.7
F1501½"28.5
F200247.5
TUCA Series -- Compact 3-way (Diverter) Valves
Part NumberSizeCv Factor
TUCA025V¼"0.4
TUCA050V½"0.4

GAUGE GUARDS
Series GGMU, Ultra-Pure Gauge Guard
Part NumberSize Cv Factor
GGMUV050 ½"10.0
GGMUV075 ¾"20.0
GGMUV1001"40.0
GGMUV1501½"100.0
GGMUV2002120.0

BALL VALVES
2-way Ball Valves, including all actuated versions
Part NumberSize Cv Factor
MBV050 ½"10.0
MBV075 ¾"20.0
MBV1001"40.0
MBV1251¼"80.0
MBV1501½"100.0
MBV2002120.0
3-way Ball Valves, including all actuated versions
Part NumberSize Cv Factor
TMBV050 ½"4.0
TMBV075 ¾"8.0
TMBV1001"13.0
TMBV1501½"38.0
TMBV200239.0

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

SOLENOID VALVES
EASYM/EASM with AC COILS
Part NumberSize 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 NumberSize 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 NumberSize 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 NumberSize 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 NumberSize 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 NumberSize 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 NumberSize 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 NumberSize Cv Factor
EASY2B8W20-NO ¼"1.1
EASY4B8W20-NO ½"1.1
PS Series Pilot-Operated/PTFE Bellows Solenoid Valves
Part NumberSize Cv Factor
PS050 ½"5.2
PS075 ¾"7.60
PS1001"9.5
PS1501½"28.0
PS2002"35.0
PS3003"80.0
THP Series 3-Way Solenoid Valves
Part NumberSize 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
WCM Series Wetted Core Solenoid Valves
Part NumberSize Cv Factor
WCM4V6W11-PP ½"0.40

Plast-O-Matic Valves, Inc.
1384 Pompton Avenue
Cedar Grove, NJ 07009-1095 USA
Voice: (973) 256-3000
Fax: (973) 256-4745

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Viton® is registered trademark of DuPont Dow Elastomers,
Kynar® is a registered trademark of Elf Atochem., Corzan tm is a trademark of Noveon, Inc.
FAIL-DRY® is a registered trademark of Plast-O-Matic Valves, Inc.

Copyright© 2002-2004 Plast-O-Matic Valves, Inc.

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