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A fueling environment having a vent on an underground fuel storage tank may be improved by adding a mass flow meter in conjunction with a vapor recovery membrane in a tank vent. The mass flow meter measures an amount of vapor that passes through the vent and thus allows alarms to be generated if the

A fueling environment having a vent on an underground fuel storage tank may be improved by adding a mass flow meter in conjunction with a vapor recovery membrane in a tank vent. The mass flow meter measures an amount of vapor that passes through the vent and thus allows alarms to be generated if the vapors passing through the vent exceed a predetermined level or an efficiency of the membrane drops below a predetermined threshold. Measurements from the mass flow meter may be provided to a site controller or a remote location for further analysis.

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A fueling environment having a vent on an underground fuel storage tank may be improved by adding a mass flow meter in conjunction with a vapor recovery membrane in a tank vent. The mass flow meter measures an amount of vapor that passes through the vent and thus allows alarms to be generated if the

A fueling environment having a vent on an underground fuel storage tank may be improved by adding a mass flow meter in conjunction with a vapor recovery membrane in a tank vent. The mass flow meter measures an amount of vapor that passes through the vent and thus allows alarms to be generated if the vapors passing through the vent exceed a predetermined level or an efficiency of the membrane drops below a predetermined threshold. Measurements from the mass flow meter may be provided to a site controller or a remote location for further analysis. passageway that extends from a first spool area to a second spool area and that communicates at least a portion of the pressurized fluid from the main port to the outlet port; a first motive force generated by the pressurized fluid from the main reacting against the first spool area; a second motive force generated by the portion of the pressurized fluid from the outlet port reacting against the second spool area, which area is greater than the first area; and a secondary valve communicating with the outlet port of the body and operable to direct the portion of the pressurized fluid from the outlet port to the second spool area or to vent the portion of the pressurized fluid from the second spool area, wherein during one operational state the secondary valve directs the portion of the pressurized fluid from the outlet to the second spool area, the second motive force moves the spool to the closed position, and the hydraulic member facilitates communication between the cylinder port and the exhaust port, and wherein during another operational state the secondary valve vents the portion of the pressurized fluid from the second area, the first motive force moves the spool to the opened position, and the hydraulic member facilitates communication of at least a portion of the pressurized fluid from the main port with the cylinder port. 7. The booster pilot valve of claim 6, wherein the spool is engaged with the fluid chamber of the body with a plurality of seals. 8. The booster pilot valve of claim 6, wherein the body comprises a protrusion having the outlet port and partially disposed in the fluid passageway of the spool. 9. The booster pilot valve of claim 6, wherein the secondary valve comprises a three-way valve. 10. The booster pilot valve of claim 6, wherein the secondary valve comprises a piezotronic valve. 11. The booster pilot valve of claim 10, wherein the piezotronic valve comprises a Bus operator to accept signals from a network Bus. 12. The booster pilot valve of claim 10, wherein the piezotronic valve operates using a current supply of approximately 1.5 mA to 10 mA. 13. The booster pilot valve of claim 12, wherein the piezotronic valve operates using a power supply of approximately 100 mW. 14. The booster pilot valve of claim 10 wherein the piezotronic valve is adapted to accept signals from a network Bus. 15. The booster pilot valve of claim 10, wherein the piezotronic valve operates over a current range of approximately 1.5 mA to 10 mA. 16. The booster pilot of claim 15, wherein the piezotronic valve operates at a power level of approximately 100 mW. 17. A booster pilot valve operated by a pressurized fluid, comprising: a body defining a fluid chamber, comprising: a main port defined in a first end of the fluid chamber for receiving the pressurized fluid, an exhaust port defined in the fluid chamber, and a stem defining an outlet port and protruding into the fluid chamber from a second end of the fluid chamber; a hydraulic member movably disposed in the fluid chamber between an opened position and a closed position without a spring biasing the hydraulic member, comprising: a first area adjacent the first end of the fluid chamber; a second area adjacent the second end of the fluid chamber, which area being greater than the first area, a fluid passageway defined in the hydraulic member and extending from the first area to the second area, at least a portion of the stem disposed within the fluid passageway so that the fluid passageway communicates the main port with the outlet port; a first motive force generated by the pressurized fluid from the main port reacting against the first hydraulic member area; and a second motive force generated by at least a portion of the pressurized fluid from the outlet port reacting against the second hydraulic member area, wherein during one operational state the first motive force moves the hydraulic member to the opened position and the hydraulic member faci litates communication of at least a portion of the pressurized fluid from the main port with the cylinder port, and wherein during another operational state the second motive force moves the hydraulic member to the closed position and the hydraulic member facilitates communication between the cylinder port and the exhaust port. 18. The booster pilot valve of claim 17, wherein the hydraulic member is engaged with the fluid chamber with a plurality of seals. 19. The booster pilot valve of claim 18, wherein a first seal seals the main port from the cylinder port when the hydraulic member is in the closed position. 20. The booster pilot valve of claim 19, wherein a second seal seals the cylinder port from the exhaust port when the hydraulic member is in the opened position. 21. The booster pilot valve of claim 17, further comprising a three-way valve in fluid communication with the fluid chamber via the outlet port. 22. The booster pilot valve of claim 21, wherein the three-way valve is vents pressurized fluid from a plenum defined between the second area and the second end for moving the hydraulic member to the opened position. 23. The booster pilot valve of claim 21, wherein the three-way valve comprises a piezotronic valve. 24. The booster pilot valve of claim 21, wherein the three-way valve directs pressurized fluid from the outlet port to the plenum defined between the second area and the second end for moving the hydraulic member to the closed position. 25. The booster pilot of claim 24, wherein a passageway in the body communicates the three-way valve with the plenum for directing or venting pressurized fluid thereto. 26. The booster pilot of claim 25, wherein an ancillary port in the body communicates with the three-way valve for venting pressurized fluid from the plenum. 27. A method of operating a valve element with a hydraulic device, a pressurized fluid, and a three-way valve operable to direct the pressurized fluid, the hydraulic device having a first area and having a second area greater than the first area, the hydraulic device movably disposed in a fluid chamber without a spring biasing the hydraulic member, the method comprising: supplying the pressurized fluid into the fluid chamber having the hydraulic device movably disposed therein; generating a first motive force on the hydraulic device with the pressurized fluid by reacting the pressurized fluid on the first area and by venting a portion of the pressurized fluid from the second area with the three-way valve; generating a second motive force on the hydraulic device by reacting the pressurized fluid on the first area and by directing a portion of the pressurized fluid with the three-way valve to react against the second area; directing at least a portion of the pressurized fluid to the valve element by moving the hydraulic device to an opened position with the first motive force; and exhausting a secondary fluid from the valve element by moving the hydraulic device to a closed position with the second motive force. 28. The method of claim 27, wherein directing the pressurized fluid to the valve element comprises sealing the secondary fluid from communicating with an exhaust port defined in the fluid chamber. 29. The method of claim 27, wherein exhausting the secondary fluid from the valve element comprises sealing the pressurized fluid from communicating with the valve element.