Post by SeaRat on Oct 11, 2014 17:19:59 GMT -8
Frank, I think I found that patent:
Wouldn't in be nice if someone actually found one of these? It looks like there was an actual photo in the catalog.
.
DavidRichieWilson:
Is the Concorde still available anywhere? That was my favorite open water finswimming fin. The plastic version was not so good.
John
SUMMARY OF THE INVENTION The foregoing and other objectives of the invention are achieved by providing a regulator second stage wherein a balanced primary valve controls the flow of breathable gas from the supply conduit inlet to an outlet chamber leading to the mouthpiece. Unlike prior art devices, this primary valve is not controlled directly by mechanical linkage to the demand-sensing diaphragm. Rather, the primary valve is responsive to the pressure differential between the inlet and a control chamber the pressure in which is established by a pilot valve linked to the diaphragm. Pneumatic amplification isolates the diaphragm from the flow control valve to achieve sensitive response between inhalation demand and volume of air supplied to the diver.
A small orifice through the primary valve bleeds some inlet air to the control chamber, so that at rest the pressure on both sides of the primary valve is balanced; a spring biases the primary valve to the closed position. The pilot valve includes a pilot orifice in a secondary flow path from the control chamber to the outlet chamber. This pilot orifice is selectively blocked or unblocked by a valve poppet connected to the diaphragm by a linkage of high mechanical advantage. As the diaphragm senses reduced'pressure in the outlet chamber, signifying an inhalation demand, the pilot orifice is slightly unblocked to lower the control chamber pressure. The resultant pressure differential between the inlet and the control chamber causes the primary valve to open proportionately, until the unbalanced pressure force exerted on the primary valve is balanced by the bias spring force. Supplied breathable gas flows past the primary valve directly to the outlet chamber and the mouthpiece.
Thus the pilot valve and primary valve cooperate to provide a volume of air at the mouthpiece which closely follows the inhalation demand. The undesirable hysteresis associated with prior art regulators is reduced substantially. Very little inhalation effort is needed to achieve adequate supply of air at the mouthpiece.
www.google.com/patents/US3783891?dq=Scubapro+regulator&hl=en&sa=X&ei=JNU5VLiMA9KxogS7_4HwAQ&ved=0CCwQ6AEwAg
A small orifice through the primary valve bleeds some inlet air to the control chamber, so that at rest the pressure on both sides of the primary valve is balanced; a spring biases the primary valve to the closed position. The pilot valve includes a pilot orifice in a secondary flow path from the control chamber to the outlet chamber. This pilot orifice is selectively blocked or unblocked by a valve poppet connected to the diaphragm by a linkage of high mechanical advantage. As the diaphragm senses reduced'pressure in the outlet chamber, signifying an inhalation demand, the pilot orifice is slightly unblocked to lower the control chamber pressure. The resultant pressure differential between the inlet and the control chamber causes the primary valve to open proportionately, until the unbalanced pressure force exerted on the primary valve is balanced by the bias spring force. Supplied breathable gas flows past the primary valve directly to the outlet chamber and the mouthpiece.
Thus the pilot valve and primary valve cooperate to provide a volume of air at the mouthpiece which closely follows the inhalation demand. The undesirable hysteresis associated with prior art regulators is reduced substantially. Very little inhalation effort is needed to achieve adequate supply of air at the mouthpiece.
www.google.com/patents/US3783891?dq=Scubapro+regulator&hl=en&sa=X&ei=JNU5VLiMA9KxogS7_4HwAQ&ved=0CCwQ6AEwAg
Wouldn't in be nice if someone actually found one of these? It looks like there was an actual photo in the catalog.
.
DavidRichieWilson:
Is the Concorde still available anywhere? That was my favorite open water finswimming fin. The plastic version was not so good.
John