Patent ID: 8701697

Claim:
A pneumatic system, comprising: a first line configured to be coupled to a container, and to convey a flow of gas from a source to the container; a second line arranged co-axially with the first line and in communication with gas in the container, wherein the second line is narrower than the first line and extends within the first line; a valve coupled in series with the first line, between the source and the container, wherein the valve comprises: a valve body having a first port, a second port, and an exhaust port; and a valve gate operable within the valve body to selectively close the first port, the second port, and the exhaust port, place the first port in fluid communication with the second port, and place the container in fluid communication with the exhaust port; wherein the valve gate is in communication with the second line and is configured to control the flow of gas through the first line as a function of the pressure of the gas within the container; and a pressure regulator coupled to the source and to the valve, wherein the pressure regulator provides a pilot pressure to a first end of the valve gate, and wherein the second line provides a feedback to a second end of the valve gate.