Variable-rate, digitally-controlled fluid metering device

A digitally-controlled 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 selected from the group consisting of a programmable logic controller, a PC with an analog/digital I/O board, a datalogger and a circuit, wherein said generator is 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, and
• a means for emitting operatively connected to the outlet end of said device.

A digitally-controlled fluid metering device consisting essentially of:

• a fluid reservoir for containing a first fluid under pressure P1,
• 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, and
• a check valve operatively connected to said reservoir and to a source of a first fluid under pressure P1.

A digitally-controlled fluid metering device consisting essentially of:

• a fluid reservoir for containing a first fluid under pressure P1,
• an electronic pulsed signal generator selected from the group consisting of a programmable logic controller, a PC with an analog/digital I/O board, a datalogger, and a circuit, wherein said generator is connected with 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, and
• a check valve operatively connected to said reservoir and to a source of a first fluid under pressure P1.

A digitally-controlled fluid metering device consisting essentially of:

• a fluid reservoir for containing a first fluid under pressure P1,
• a pressure relief valve at the outlet end of 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, and
• a check valve operatively connected to said reservoir and to a source of a first fluid under pressure P1.

A digitally-controlled fluid metering device consisting essentially of:

• a fluid reservoir for containing a first fluid under pressure P1,
• an electronic pulsed signal generator selected from the group consisting of a programmable logic controller, a PC with an analog/digital I/O board, a datalogger, and a circuit, wherein said generator is connected with 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, and
• a check valve operatively connected to said reservoir and to a source of a first fluid under pressure P1.

A digitally-controlled fluid metering device consisting essentially of:

• a fluid reservoir having a floating ball within and a means for restricting travel of said ball;
• wherein said reservoir contains a first fluid under pressure P1,
• a pressure relief valve at the outlet end of 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, and
• a check valve operatively connected to said reservoir and to a source of a first fluid under pressure P1.