A hydraulic switch works by responding to pressure changes in a hydraulic system, activating an electrical circuit when a pre-set pressure threshold is reached.
Here's a breakdown of the process:
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Pressure Sensing: The switch is directly connected to the hydraulic system and constantly monitors the pressure of the hydraulic fluid.
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Internal Mechanism: Inside the switch, a pressure-sensitive element (typically a piston, diaphragm, or Bourdon tube) deflects or moves in response to changes in pressure.
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Activation Point (Set Point): The switch is calibrated to a specific pressure level called the "set point." This is the pressure at which the switch will activate.
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Electrical Contact: When the hydraulic pressure reaches the set point, the movement of the pressure-sensitive element triggers a mechanical linkage or switch. This linkage either opens or closes an electrical circuit.
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Signal Output: The change in the electrical circuit (opening or closing) sends a signal to other components in the system. This signal can be used to:
- Start or stop a hydraulic pump.
- Activate an alarm or warning light.
- Control a valve or other actuator.
- Shut down the entire system for safety.
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Deactivation: As the hydraulic pressure falls below the set point (often by a certain differential or deadband), the pressure-sensitive element returns to its original position, and the electrical circuit is restored to its original state.
In summary: A hydraulic switch acts as a pressure-sensitive "gatekeeper," triggering an electrical response when a certain pressure level is detected in the hydraulic system. This allows for automated control and monitoring of hydraulic processes.
