| 摘要 |
An apparatus for flow detection, measurement and control and method for use of same in a piping and/or fire sprinkler system. The apparatus combines a flow sensor for creating an electrical output proportional to flow through therethrough with a bypass means for allowing flow through an alternate flow path where a primary flow path is insufficient to supply the demand. The apparatus includes a moving orifice plate, which is displaced by flow through the sensor and creates an electronic output by the interaction of a moving magnet moving in tandem with the orifice plate with a normally closed Reed switch on an exterior surface of the sensor, which is opened when the magnet is displaced into sufficiently close proximity to the Reed switch. The apparatus can also be adapted to serve as a double check valve. A moving check is added with a sealing means thereon for providing one check, and sealing means on the orifice plate are provided to serve as a second check. A method of using said apparatus in a piping and/or fire protection system is disclosed. The method allows a bypass of flow restrictions such as a water softener. The method also provides for re-circulation of heated water through a fire protection system to prevent stagnation and freezing of water in the system. The method can be used with a multipurpose piping system having both fire sprinklers and domestic uses supplied thereby.
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