Pre-Rinse Spray Valves
Water savings can be achieved by replacing existing pre-rinse spray valves. Because
water use of pre-rinse spray valves is dependent on facility operations and factors
such as average throughput, water savings will vary by facility. To estimate facility-
specific water savings and payback, use the following information.
Current Water Use
To estimate the current water use of a pre-rinse spray valve, identify the following
information and use Equation 4-16:
Flow rate of the existing pre-rinse spray valve. Pre-rinse spray valves installed af-
ter 2005 have flow rates of 1.6 gpm or less. Pre-rinse spray valves installed before
can have flow rates of up to 4.5 gpm.
Average daily use time. This will vary by facility, but facilities typically use pre-
rinse spray valves for no more than 200 minutes per day.
Days of facility operation per year.
Equation 4-16. Water Use of Pre-Rinse Spray Valve (gallons per year)
= Flow Rate of Pre-Rinse Spray Valve x Daily Use Time x Days of Facility
Flow Rate of Pre-Rinse Spray Valve (gallons per minute)
Daily Use Time (minutes per day)
Days of Facility Operation (days per year)
Water Use After Replacement
To estimate the water use of a more efficient replacement pre-rinse spray valve, use
Equation 4-16, substituting the flow rate of the replacement pre-rinse spray valve.
Efficient pre-rinse spray valves use 1.3 gpm or less.
To calculate the water savings that can be achieved from replacing an existing pre-
rinse spray valve, identify the following information and use Equation 4-17:
Current water use as calculated using Equation 4-16.
Water use after replacement as calculated using Equation 4-16.
U.S. Environmental Protection Agency’s (EPA’s) WaterSense program. March 31, 2011.
Pre-Rinse Spray Valves Field Study Report