RainSwitch

Designed for sewer/storm drain diversion control, the RainSwitch will detect 1/10th on an inch of rainfall, which assures the initial run-off will flow to the sewer system. This first run-off is typically high in contaminants and bacteria and therefore needs to flow to the sewer system for proper treatment. Once the first 1/10th of an inch has fallen, the RainSwitch will trip a relay which is connected to a diversion system, directing the subsequent run off to the storm drain.

The RainSwitch Control System is composed of the RainSwitch, a Pilot Station, and typically a Butterfly Valve.

Other uses include Irrigation Control, Retractable Roof Control, Rainwater Capture/Collection Systems, and Cistern Control.

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RainSwitch™

Designed for sewer/storm drain diversion control, the RainSwitch will detect 1/10th on an inch of rainfall, which assures the initial run-off will flow to the sewer system. This first run-off is typically high in contaminants and bacteria and therefore needs to flow to the sewer system for proper treatment. Once the first 1/10th of an inch has fallen, the RainSwitch will trip a relay. Other uses include Irrigation Control, Retractable Roof Control, Rainwater Capture/Collection Systems, and Cistern Control.

The RainSwitch is made of stainless steel to ensure long life against harsh environments. The RainSwitch is designed with a 14” funnel to collect the falling rain. Once a 1/10th of an inch of rain has fallen, the level chamber will be filled to the point that a conductive level sensor will sense the level. This signal then travels to the Pilot Station which has a level controller mounted inside that changes state (switch). This controller sends a very small current to the probe, so the circuit is completed as soon as water touches the probe, and after the 3 second delay, switches the contacts in the controller. This has proven to be extremely repeatable, and not subject to fouling.

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Pilot Stations

Used in conjunction with the RainSwitch to indicate status, control, and reset the system after the rain event has concluded. Available in both Manual and Automatic Reset versions to meet various agency requirements.

Pilot Station with Auto-Reset - #JICATIPB2L-C
NOTE: (not accepted by L.A. County Sanitation)

Normal Mode (No Rain):
The pump or valve is in its normal mode, with flow into the sewer system. The green light is on, displaying “normal condition”. The automatic timer actuates and opens the solenoid valve (draining the RainSwitch) for 15 minutes, every 10 hours. When in the normal mode, this function has no effect on the system.

Divert Mode (Raining):
Once a 1/10th of an inch of rain has fallen, the RainSwitch will change the state of the pump or valve, diverting the rainwater to the storm drain system.The green light goes off, the red light will go on, once the valve has reached it's divert position, indicating the system is in the “divert mode”. Again, the automatic timer will reset the RainSwitch every 10 hours, causing the pump or valve to return to its normal mode. This will return the flow to the sewer system until a 1/10th of an inch of rain is again detected. This sequence repeats itself until it stops raining, and the system returns to the “normal mode” referenced above.

Pilot Station with Manual Reset - #JIC1PB2L-C
It functions the same as above except after it stops raining, an operator will depress the reset pushbutton on the station, causing the solenoid valve to open (draining the RainSwitch). The pushbutton must be depressed until all water is completely drained from the RainSwitch. This will return the system to the “normal mode” position.

Valves

The RainSwitch is connected to a diversion system, directing the subsequent run off to the storm drain system. The diversion system typically consists of a butterfly/ball valve adjacent to a clarifier, or sometimes a sump pump is used which controls the flow to the sewer or storm drain. The system design depends on the plumbing arrangement of your drainage system.

Valin provides 2- & 3-Way Butterfly & Ball Valves for diversion of flow from sewer to the storm water piping which include wiring schematics and installation recommendations with our RainSwitch. Please Contact Us and advise your pipe size and arrangement to get a quotation.