Fluid handling – Line condition change responsive valves – Line flow effect assisted
Patent
1977-03-21
1978-04-18
Weakley, Harold W.
Fluid handling
Line condition change responsive valves
Line flow effect assisted
137501, 13750516, F16K 1734
Patent
active
040846121
ABSTRACT:
Apparatus for regulating pressure of treatment fluid being supplied to a human or animal eye during ophthalmic procedures such as cataract surgery is disclosed.
Flow sensing and pressure regulating diaphragms are provided in a body to modulate a flow control valve. The pressure regulating diaphragm is connected to the flow control valve to urge the valve to an open position due to pressure being applied to the diaphragm by bias means such as a spring. The flow sensing diaphragm is mechanically connected to the flow control valve and urges it to an opened position because of the differential pressure on the diaphragm generated by a flow of incoming treatment fluid through an orifice in the diaphragm. A bypass connection with a variable restriction is connected in parallel relationship to the orifice to provide for adjusting the sensitivity of the flow sensing diaphragm.
A multiple lever linkage system is utilized between the center of the second diaphragm and the flow control valve to multiply the force applied to the valve by the other diaphragm and reverse the direction of the force.
A vertically extending tube communicates with the upper side of the pressure regulating diaphragm which also communicates with an auxiliary outlet port.
REFERENCES:
patent: 2182873 (1939-12-01), King
patent: 3433254 (1969-03-01), Frascati
Mackin J. A.
Manning J. R.
Musial N. T.
The United States of America as represented by the Administrator
Weakley Harold W.
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