Back to results
US 4,406,302 AGranted
Pop-off gas evacuator valve for anesthesia machine
AssigneePuritan-Bennett Corporation
InventorRussell Olesen
Life of this patent
Estimating the term…
Abstract
A pop-off valve (92) having a significantly improved pressure-flow characteristic and resistance to vibration or "honking." The valve includes a poppet (154) having a flat bottom end wall exposed to pressure and a peripheral lip with a frusto-conical surface (158) for engagement with a valve seat 140. A vent-hole (196) in the poppet further enhances the vibration characteristics of the valve, and a dampening chamber (186) downstream of the poppet dampens any remaining vibrations.
Claims6
A pop-off valve for use in a gas anesthesia machine, said valve comprising:
- a valve housing having a lower end and a closed upper end;
- a valve seat located in said lower end and being connectable to a breathing system from which excess pressure is to be relieved;
- a valve poppet sized to slide freely in said body and having a cylindrical shape with a closed lower end wall and a peripheral wall about said end presenting a frustoconical surface to said valve seat;
- a compression spring for biasing said valve poppet onto said valve seat;
- means for adjusting the spring-biasing force applied to said valve poppet;
- a plurality of openings in said housing close to said valve seat, to provide a fluid path for gas after said valve poppet is lifted from said valve seat;
- and
- fluid communication means for connecting said plurality of openings with an output line;
- whereby the shape of said poppet provides an improved valve characteristic and effectively eliminates valve vibration, and wherein said valve poppet includes at least one vent-hole extending through its sidewall, to provide a controlled dampening effect on rapid movements of said valve poppet, thereby further moving a resonance condition away from a normal operating region.
6 more elements
A pop-off valve for use in a gas anesthesia machine, said valve comprising:
- a valve housing having a lower end and a closed upper end;
- a valve seat located in said lower end and being connectable to a breathing system from which excess pressure is to be relieved;
- a valve poppet sized to slide freely in said body and having a cylindrical shape with a closed lower end wall and a peripheral wall about said end presenting a frusto-conical surface to said valve seat;
- a compression spring for biasing said valve poppet onto said valve seat;
- means for adjusting the spring-biasing force applied to said valve poppet;
- a plurality of openings in said housing close to said valve seat, to provide a fluid path for gas after said valve poppet is lifted from said valve seat;
- and
- fluid communication means for connecting said plurality of openings with an output line, said fluid communications means including a dampening chamber to absorb any vibrations of said valve poppet and inhibit their transmissions away from said valve;
- whereby the shape of said poppet provides an improved valve characteristic and effectively eliminates valve vibration, and wherein said valve poppet includes at least one vent-hole extending through its sidewall, to provide a controlled dampening effect on rapid movements of said valve poppet, thereby further moving a resonance condition away from a normal operating region.
6 more elements
A pop-off valve for use in a gas anesthesia machine, said valve comprising:
- a valve housing having a lower end and a closed upper end;
- a valve seat located in said lower end and being connectable to a breathing system from which excess pressure is to be relieved;
- a valve poppet sized to slide freely in said body and having a cylindrical shape with a closed lower end wall and a peripheral wall about said end presenting a frusto-conical surface to said valve seat;
- a compression spring for biasing said valve poppet onto said valve seat;
- means for adjusting the spring-biasing force applied to said valve poppet, said means including an adjustment knob having a shaft threadably coupling to said closed end of said housing and extending therethrough, and spring retaining means for securing said compression spring to said shaft within said housing, whereby rotation of said knob varies the compressive force applied to said valve poppet by said spring;
- a plurality of openings in said housing close to said valve seat, to provide a fluid path for gas after said valve poppet is lifted from said valve seat;
- and
- fluid communication means for connecting said plurality of openings with an output line;
- whereby the shape of said poppet provides an improved valve characteristic and effectively eliminates valve vibration.
6 more elements
Dependencies are inferred from the claim text.