Above is a completed Opti-Valve installation. This package uses a temperature sensor for control and a gate valve to adjust flow rate. The sensor must be installed as close as possible (2 inches maximum) of the pump body to be able to detect the water temperature. The length and type of fittings used between the sensor “tee” and the gate valve is very flexible, however a close nipple should be used between the gate valve (or restrictive orifice) and the solenoid valve. The electrical conductors run back to the power supply where all electrical connections are made-up.

The picture to the right shows the problem with the use of “old tech” casing relief valves. Two things to note;
1) on the right side one can see the minerals that have been deposited in the elbow and
2) on the left, the adjustment “tee” handle has been tightened down completely.