Pedal flow switch

Pedal Flow Switch:

In many equipment types, such as pumps, the presence of fluid is essential, meaning that the absence of fluid can cause damage to the equipment and take the system out of service.
The presence or absence of fluid in systems is monitored using a device called a flow switch.

One type of flow switch that is more commonly used in industries such as HVAC* compared to other flow switches is the vane/paddle flow switch. In this type of flow switch, as the name suggests, the fluid flow moves the vane or paddle, which in turn activates the switch. This operation can be seen in the figure below.

The flow switch uses the force of the fluid flow to move the paddle of the switch, which indicates the incoming flow or movement of the fluid in the pipe. When the fluid is moving, the paddle is displaced and, upon reaching the specified setpoint, sends a signal to trigger a predetermined response.

 This type of flow switch acts as a balancing arm between the flow rate and a control spring. When the process flow rate deviates below or above the set points, micro switches send on/off commands. The flow switch with a float vane is designed for applications requiring long service life.

Footnote:

(HVAC: Heating, Ventilating, and Air Conditioning) refers to the set of technologies related to heating, ventilation, and air conditioning, encompassing systems designed to provide comfort by controlling airflow and maintaining desirable indoor temperature conditions.