1
/
of
2
Solar Well Pumps Online
Snap Action Pressure Switch, Pr Sw 21858PSI 1/8 Npt
Snap Action Pressure Switch, Pr Sw 21858PSI 1/8 Npt
Regular price
$75.00 USD
Regular price
Sale price
$75.00 USD
Unit price
/
per
Couldn't load pickup availability
Using the snap action pressure switch 1/8 NPT in a solar well pump system allows you to use your existing water line as a "signal" to shut off the pump. This eliminates the need to run long sensor wires to distant stock tanks.
How the System Works
When the mechanical float in your stock tank rises and closes the valve, it blocks the flow of water. Because the pump is still running, water pressure builds up rapidly in the pipeline. The pressure switch detects this spike; once the pressure reaches its set limit (adjustable between 21.8 and 58.0 PSI), it triggers a signal to the solar controller to stop the pump.
Installation Steps
-
Plumbing Setup:
- Install a Check Valve at or near the pump. This is critical to maintain pressure in the line so the switch can "feel" the tank closing.
- Install the pressure switch inline between the pump and the tank using a Tee fitting. It is usually installed near the well head or the solar controller for easy wiring.
-
Wiring to the Controller:
- Wire the pressure switch to the "Tank" or "TH/COM" terminals on your solar pump controller.
- Since this is a "reverse action" setup, the switch should be Normally Open (pump runs) and Close (circuit connects) when high pressure is reached to tell the controller the tank is full.
-
Adjustment and Calibration:
- Run the pump under full sun with the tank valve open to observe the normal operating pressure.
- Close the float valve manually to let pressure build.
- Adjust the screw on the pressure switch until the controller "Tank Full" light comes on and the pump stops.
Key Benefits
- Cost-Efficient: Saves the expense of trenching hundreds or thousands of feet of sensor wire to remote tanks.
- Automatic Cycling: When livestock drink and the float valve opens, line pressure drops, causing the switch to reset and the pump to restart automatically.
- System Protection: Prevents the pump from dead-heading (running against a closed valve), which can lead to pipe bursts or pump damage.
Important Tip: If your pump "pulses" (rapidly turns on and off), consider adding a small Pressure Tank or a capped vertical PVC "air bladder" to provide a pressure buffer.
Share
