Surge prevention device
A surge prevention valve may be used to prevent the formation of an initial surge of high pressure. The valve may be located, for example, between a high pressure gas cylinder and a medical pressure regulator. The valve is provided with first and second valves located within a housing and integrating a pressurization orifice. The initial opening of the valve in an axial direction enables gas to flow through the pressurization orifice at a first flow rate. The full opening of the valve in the axial direction enables the gas to flow through the second valve at a second flow rate, which is much higher than the first flow rate. The controlled pressurization of the gas through the orifice delays the time during which the gas reaches full recompression. The valve may be further provided with a vent for venting pressurized gas away from a nominally closed top surface of the lower valve element. The valve may be also provided with a valve inlet tube extending into a gas cylinder to prevent contaminants, particles and/or impurities from entering the valve.
1. A method of operating a medical oxygen delivery system, the method comprising the steps of:
providing a cylinder containing oxygen;
providing a medical device for delivering the oxygen to a patient;
providing a valve between the oxygen cylinder and the medical device, the valve having a stem with a reduced diameter portion;
opening the valve to a partially open condition by moving the stem in a first axial direction to allow the oxygen to flow through a first flow path and at a first flow rate; and
subsequently, opening the valve to allow the oxygen to flow through a second flow path at a second flow rate, the second flow rate being greater than the first flow rate.
2. The method of claim 1 , further comprising the steps of pushing at least a portion of a handle in the first axial direction to open the valve to the partially open condition, and rotating the handle to open the valve.
3. The method of claim 2 , wherein the handle includes a button that moves in the first axial direction and a handle member that moves in a second direction.
4. The method of claim 3 , wherein the second direction is a rotational direction.
5. The method of claim 2 , further comprising an engagement torque unit for transmitting torque from the handle to open the valve.