Pressure regulator
First Claim
1. A pressure regulator suitable for use as a breathing demand valve in various self-contained breathing apparatus, comprising a first chamber having an inlet port and an outlet flow path, the inlet port being connectable to the outlet of a pressurized fluid supply, an inlet valve being positioned within the inlet port and biased so as to seal the first chamber from the pressurized fluid supply, wherein the opening of the inlet valve can be actuated by the thrust due to the deflection of a diaphragm positioned so as to separate the first chamber from a second chamber, a baffle plate positioned in between the diaphragm and inlet port reducing negative feedback to the flow rate through the first chamber by preventing a portion of the pressurized fluid flow released through the open inlet valve from impinging upon, and tending to deflect, the diaphragm in a direction tending to close the inlet valve, and wherein a Venturi tube extends from an outlet flow path such that, upon removal of fluid from the first chamber, along the outlet flow path, the pressure in the gap between the baffle plate and diaphragm is reduced by the Venturi tube accordingly.
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0 Petitions
Accused Products
Abstract
A pressure regulator suitable for use as a breathing demand valve in self-contained breathing equipment comprising a first chamber incorporating an inlet port having an inlet valve therein, preferably in the form of a poppet valve and biased so as to seal of the inlet port, and separated from a second chamber by a diaphragm. The diaphragm co-operates with the end of a stem extending from the poppet valve member of the inlet valve such that, upon inhalation by the user, the diaphragm is deflected towards the inlet valve and exerts a force on the poppet valve stem sufficient to open the poppet valve and, upon exhalation by the user, the diaphragm is deflected away form the inlet valve so that the diaphragm no longer contacts the end of the poppet valve stem and the inlet valve closes. A baffle plate is positioned in between the diaphragm and inlet valve so as to prevent, when the inlet valve is open, a portion of the pressurized fluid flow from impinging upon the underside of the diaphragm and tending to close the inlet valve. Optionally, the end of the diaphragm may incorporate an exhaust port to ambient, which, when the inlet valve is opened, is sealed by the end of the poppet valve stem sealably engaging with a valve seat around the exhaust port.
53 Citations
19 Claims
- 1. A pressure regulator suitable for use as a breathing demand valve in various self-contained breathing apparatus, comprising a first chamber having an inlet port and an outlet flow path, the inlet port being connectable to the outlet of a pressurized fluid supply, an inlet valve being positioned within the inlet port and biased so as to seal the first chamber from the pressurized fluid supply, wherein the opening of the inlet valve can be actuated by the thrust due to the deflection of a diaphragm positioned so as to separate the first chamber from a second chamber, a baffle plate positioned in between the diaphragm and inlet port reducing negative feedback to the flow rate through the first chamber by preventing a portion of the pressurized fluid flow released through the open inlet valve from impinging upon, and tending to deflect, the diaphragm in a direction tending to close the inlet valve, and wherein a Venturi tube extends from an outlet flow path such that, upon removal of fluid from the first chamber, along the outlet flow path, the pressure in the gap between the baffle plate and diaphragm is reduced by the Venturi tube accordingly.
Specification