초록 ▼

A variable-rate, digitally controlled fluid metering device having an electronically controlled 3-way valve, a fluid reservoir, a float valve, a check valve and a pressure relief valve that accurately delivers low flow volumes. The flow rate of the device is the product of reservoir volume and pulse

A variable-rate, digitally controlled fluid metering device having an electronically controlled 3-way valve, a fluid reservoir, a float valve, a check valve and a pressure relief valve that accurately delivers low flow volumes. The flow rate of the device is the product of reservoir volume and pulse rate when the cycle is long enough to fill and empty the reservoir and is a linear combination of cycle time when the cycle is short enough that the reservoir does not fill or empty completely. This device allows the use of large orifice emitters for delivering low flow rates of fluids, which allows the use of lower quality fluids and/or reduces filtration steps and clogging of emitters.

대표청구항 ▼

[ We claim:] [1.]1. A fluid metering device consisting essentially of:a fluid reservoir for containing a first fluid under pressure P1 with a floating ball within said reservoir,a means for restricting travel of said ball within said reservoir,an electronic pulsed signal generator operatively connec

[ We claim:] [1.]1. A fluid metering device consisting essentially of:a fluid reservoir for containing a first fluid under pressure P1 with a floating ball within said reservoir,a means for restricting travel of said ball within said reservoir,an electronic pulsed signal generator operatively connected to an electronically controlled three-way valve,said electronically controlled three-way valve operatively connected to said reservoir and to a source of a second fluid under pressure P2 wherein said valve is controlled by said signal generator to provide variable flow rates of said first fluid in a series of pulses of known volume,a float check valve operatively connecting said three-way valve with said reservoir,a check valve operatively connecting said reservoir with a source of said first fluid under pressure P1,a pressure relief valve operatively connected to said reservoir and to an outlet end of said device, anda means for emitting operatively connected to the outlet end of said device.