# Top 5 CircuitSolver FAQs

CircuitSolver FAQs

Top 5 CircuitSolver Frequently Asked Questions

To answer your CircuitSolver questions, we put together a list of some of our common CircuitSolver FAQs (Frequently Asked Questions) regarding the CircuitSolver product line. 1. What is the GPM when the valve is closed?
When CircuitSolver is closed it does not shut off completely and still allows a fraction of a gallon per minute flow. This allows it to better sample upstream water temperature changes, as well as better facilitate high temperature sanitizing cycles of the domestic hot water system. To determine the GPM, multiply the square root of the pressure differential across the valve by the Cv.

For example, if pressure differential is 4 psi, square root of 4 is 2, and 2 X Cv = GPM.

2. What is the full open rate of CircuitSolver?
The published Cv flow coefficient for each valve size allows calculation of the full open flow rate. Multiply the square root of the pressure differential across the valve by the Cv to get GPM. For example, if pressure differential is 4 psi, square root of 4 is 2, and 2 X Cv = the full open GPM.

3. What is the highest temperature CircuitSolver can handle?
CircuitSolver is rated to a maximum temperature of 250°F (121°C). All the valves can easily handle more than 212°F (100°C) which is the boiling point of water and higher than any water temperature in a domestic hot water system.

4. What is the pressure drop across a CircuitSolver?
The basic approximation for the pressure drop across the CircuitSolver within a given branch utilize the following equation where Cv = design Cv and flow is the estimated flow to offset heat loss in the branch:

For this example – Cv = .85 (design Cv for ¾” CircuitSolver)
Flow = 1 GPM (estimated flow to offset heat loss in a given branch)

ΔP = [GPM/Cv]2  = [1/.85]2  = 1.4 psi

5. Is there a warranty offered with the valve?
Yes, the CircuitSolver product line offers a 3-year warranty.