Fluid handling – Line condition change responsive valves – Direct response valves
Reexamination Certificate
2005-05-10
2005-05-10
Krishnamurthy, Ramesh (Department: 3753)
Fluid handling
Line condition change responsive valves
Direct response valves
C137S513300, C137S515500, C137S854000
Reexamination Certificate
active
06889707
ABSTRACT:
An ON/OFF valve (1,1′,1″) that has an outer body (3) defining a fluid flow cavity (2) divided by an intermediate surface (8, 21) into a first and a second chamber (2a,2b) communicating with each other via an opening section (6, 28) in the intermediate surface (8, 21). A flexible shutter (7) has on the side facing the first chamber (2a), a membrane portion (17) that cooperates elastically, by virtue of a fluid pressure, with the intermediate surface (8, 21) and with the opening section (6, 28) to separate the first and second chamber (2a,2b) hermetica1ly. Fluid leakage generating members (20, 27) are located between the membrane portion (17) of the shutter (7) and the opening section (6, 28), and are active when the pressure in the first chamber (2a) exceeds the pressure in the second chamber (2b) by an amount equal to or less than a threshold value (P) other than zero.
REFERENCES:
patent: 3779276 (1973-12-01), King, Sr.
patent: 4054152 (1977-10-01), Ito et al.
patent: 4177831 (1979-12-01), Benjamin
patent: WO 0026567 (2000-05-01), None
Krishnamurthy Ramesh
Pres-Block S.p.A.
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