초록 ▼

A positive displacement flushable flow meter has sensing elements that are rotated by and at a rate in accordance with a flow of fluid through the flow meter. The flow meter is particularly adapted for measuring the volume flow rate of coating material supplied to spray coating apparatus, and to per

A positive displacement flushable flow meter has sensing elements that are rotated by and at a rate in accordance with a flow of fluid through the flow meter. The flow meter is particularly adapted for measuring the volume flow rate of coating material supplied to spray coating apparatus, and to permit the flow meter to be quickly flushed by means of alternate bursts of relatively high velocity air and solvent, without overdriving the sensing elements and damaging the flow meter, a bypass valve is provided. During a spray coating operation, the bypass valve is closed and all of the coating material flows past and rotates the sensing elements. During a flushing operation, the bypass valve is opened to divert some of the relatively high velocity flow of air and solvent around the sensing elements, while allowing a controlled and limited amount of air and solvent to move past and rotate the elements to clean them without causing them to be overdriven.

대표청구항 ▼

A positive displacement flow meter for measuring the volume flow of liquid coating material delivered to spray coating apparatus and for being flushed clean of coating material by fluidic flushing media, said flow meter comprising a housing having inlet passage means and outlet passage means; means

A positive displacement flow meter for measuring the volume flow of liquid coating material delivered to spray coating apparatus and for being flushed clean of coating material by fluidic flushing media, said flow meter comprising a housing having inlet passage means and outlet passage means; means for supplying either liquid coating material at a first volume flow rate and under pressure or fluidic flushing media at a second and greater volume flow rate and under pressure to said inlet passage means; movable liquid flow sensing means intermediate said inlet and outlet passage means for flow therethrough of coating material and flushing media from said inlet to said outlet passage means, said sensing means being moved in response to and at a rate in accordance with the volume flow rate of coating material or flushing media therethrough and generating an indication of the volumetric flow of coating material flowing therethrough; bypass valve means for selectively shunting a portion of the fluid in said inlet passage means around said flow sensing means to said outlet passage means; and means for operating said bypass valve means so that no fluid is shunted around said flow sensing means when coating material is supplied to said inlet passage means so that a portion of the fluid is shunted around said flow sensing means when flushing media is supplied to said inlet passage means.