| 摘要 |
A fluidic valve assembly for use with a low pressure hyperbaric chamber, a pressurized source of oxygen, a flow control unit in an oxygen feed line in fluid communication with the chamber, an exhaust valve in fluid communication with the chamber, said exhaust valve being in fluid communication with the oxygen feed line whose pressure maintains the exhaust valve in the closed condition, a one way valve in a first pressure line in fluid communication with the chamber set to allow flow from the chamber at a prescribed pressure, a second pressure line in fluid communication with the chamber, said fluidic valve assembly comprising an inlet flow valve having an inlet connected to the oxygen source and an outlet fluidly connected to the oxygen feed line in communication with the chamber, a closure for closing said outlet, a power assembly connected to the first pressure line for closing said closure when fluid flows in the first pressure line upon the attainment of the prescribed chamber pressure, a first vent for venting the oxygen feed line to atmosphere, the aforesaid power assembly simultaneously opening the first vent to atmosphere with the closing of the closure for the outlet of the inlet flow valve, the decrease of pressure in the oxygen feed line allowing the exhaust valve to open to vent the chamber to atmosphere, a second vent for venting the power assembly, and a pressure assembly connected to the second pressure line in fluid communication with the chamber for controlling the second vent in response to chamber pressure wherein upon the loss of pressure in the chamber, the pressure in the aforesaid pressure assembly decreases to allow the second vent to open to vent the power assembly to atmosphere whereby the oxygen pressure from the timer will force open the closure for the outlet of the inlet flow valve and simultaneously close the first vent to open fluid flow between the outlet and the chamber through the oxygen feed line to commence a new cycle.
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