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Encyclopedia > Float valve

A float valve is a mechanical feedback mechanism that regulates fluid level by using a float to drive an inlet valve such that a higher fluid level will force the valve closed whilst a lower fluid level will force the valve open. This is an example of negative feedback. In cybernetics and control theory, feedback is a process whereby some proportion or in general, function, of the output signal of a system is passed (fed back) to the input. ... Negative feedback is a type of feedback, during which a system responds so as to reverse the direction of change. ...


See also ballcock. A ballcock is a mechanism for filling water tanks, such as those found in flush toilets, while avoiding overflow. ...


  Results from FactBites:
 
Float Valves by Cleveland Valve Co (818 words)
This valve eliminates all of the problems caused by mechanical float valves as well as outperforms any other valve on the market with respect to valve life, inlet pressure and water flow.
Conventional valves measure 20" to 36" from valve to float.
Conventional Valves are made from precision machined brass parts and use water levels to create leverage on the stem which forces the Plunger inward to close the valve.
Patent 5445501 (3557 words)
Further, the change-over valve 120 is of such a construction that when one of the valve parts of the gas inlet and outlet valve mechanism is closed, the other valve part is opened, and as understood from the relationship in the position of both valve parts 122, 123 and the actuating rod 121 in FIG.
An outlet valve 20 is housed in the operating fluid outlet 11 and an inlet valve 21 is housed in the operating fluid inlet 13, said inlet and outlet valves constituting a change-over valve 120 similar to the valve shown in FIG.
Moreover, when the inlet valve 21 is opened and the outlet valve 20 is closed, a force is applied to the pin 76 so as to rotate the axis of the pin 76 because the center axis of the outlet valve 20 and that of the slider 53 are shifted relative to each other.
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