Abstract: A mechanical seal support system may facilitate feeding barrier fluid to a mechanical seal. A predetermined difference in pressure between the barrier fluid at a position before and after passage through the seal is detected. The flow of barrier fluid to the seal may be reduced when the predetermined pressure difference is detected.

Abstract: A seal support system (1) for maintaining barrier fluid in a mechanical seal (2) comprising a vessel (10) for containing barrier fluid, feeding means for feeding barrier fluid between the vessel (10) and the mechanical seal (2), detecting means for automatically detecting barrier fluid within the vessel (10) and restoring means for automatically restoring barrier fluid within the vessel (10) and further comprising discharging means (100) for automatically draining barrier fluid from the vessel (10) after a predetermined period of time. The discharging means (100) may automatically drain barrier fluid from the vessel (10) for a predetermined period of time. The discharging means (100) may automatically drain barrier fluid from the vessel (10) with a predetermined rate of discharge. The discharging means (100) preferably comprise outlet means (120) for draining barrier fluid from the vessel (10) and a valve for automatically controlling the draining of barrier fluid from the vessel.

Abstract: A mechanical seal support system may facilitate feeding barrier fluid to a mechanical sea. A predetermined difference in pressure between the barrier fluid at a position before and after passage through the seal is detected. The flow of barrier fluid to the seal may be reduced when the predetermined pressure difference is detected.

Abstract: A method of selecting a ventilation control strategy from among a plurality of ventilation control strategies. The method comprises the steps of: determining if a CO2 signal is present and valid; selecting a CO2 based ventilation control strategy if the CO2 signal is present and valid; selecting a second ventilation control strategy if the CO2 signal is not present or is invalid; and operating using the selected strategy. The selection step occurs in a zone controller.

Abstract: A fluid flow control valve includes a housing having a fluid inlet and a fluid outlet, which define a flowpath therebetween. Within the housing is a chamber located in the flowpath between the fluid inlet and the fluid outlet. A valve member is mounted within the chamber from movement between an open position, allowing for flow along the flowpath, and a closed position, which prevents such flow. The valve member is biassed to the open position. The fluid control valve further includes a device for regulating fluid pressure to enable the fluid pressure to be set on the inlet side of the valve member.