Val-Matic - Energy Cost Calculator for Valves

Energy Cost Calculator for Valves

PURPOSE:

Valve Selection affects energy consumption in pumping systems. Follow the three steps below to see the energy consumption for various check valves, pump control valves, and shut off valves.

Pump Control Valves are sometimes smaller than the pipe size to lower the initial cost and improve controllability. However, verify that the fluid velocity for the valve size does not exceed the maximum recommended velocity for the selected valves.

Valve headloss can be converted into pump energy cost by the equation:

40-Year Energy Cost = 40 * 1.65 Q H Sg C U / E

Where:

Q	=	*flow rate, gpm*
H	=	head loss of valve and reducers, ft. of water (based on typical flow coefficients)
Sg	=	*specific gravity, dimensionless*
C	=	*cost of electricity, $/kW·h*
U	=	*usage, percent*
E	=	*efficiency of pump/motor set, percent*

1. Specify Operating Parameters:

Pipe size:	in	Valve size*:	in

Pump Flow Rate (Q):		Percent useage (U):	%

Specific Gravity (Sg):		Efficiency of Pump/Motor (E):	%

Cost of Electricity (C):

* Smaller than pipe size valves can be used for better control and lower initial cost.

2. Select Valve Types for Comparison:

Lift Check Valves

Ball Check (2-14 in)

Wafer Silent Check (2-10 in)

Globe Silent Check (2.5-42 in)

Swing Check Valves

Dual Disc® (2-60 in)

Swing Check w/L&W (2-48 in)

SURGEBUSTER®/Swing-Flex® (2-48 in)

Tilted Disc® (4-60 in)

Pump Control Valves

Globe-Style Control (2-48 in)

AWWA Ball (4-48 in)

AWWA Butterfly (3-120 in)

Cone (4-48 in)

Shut Off Valves

AWWA Butterfly (3-120 in)

AWWA Gate (2-48 in)

Eccentric Plug (2-48 in)

AWWA Ball (4-48 in)

3. Calculate Energy Costs of the Selected Valves: