Vane Flow Switches
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Vane Flow Switches Vane Actuated Flow Switches Basic Operating Principle Flow through the horizontal pipeline causes the pivoted vane assembly to swing in the direction of the flow. The vane assembly lifts an attraction sleeve which in turn causes the magnet to pull in and actuate the switch. The o-ring sealed adjusting screw in the top of the enclosing tube compresses the range spring located above the attraction sleeve. Turning the adjusting screw clockwise increases the flow rate at which the switch actuates. Adjustments can be made while the flow switch is in service. Disc Flow Switches Basic Operating Principle The rate of flow through the valve body raises or lowers the disc. This in turn raises or lowers the magnetic sleeve, within its sealed non-magnetic enclosing tube. On an increasing flow rate, the magnetic sleeve rises into the field of the permanent magnet, located outside the enclosing tube, actuating the attached switch mechanism. When the flow disc is calibrated, a reversal of this action occurs. |
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