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US 4,070,910 AGranted
Fluid flow measuring apparatus
OwnerWilliam R. Albaninventor
Life of this patent
Estimating the term…
Abstract
A fluid flow measuring apparatus characterized by a low friction piston and seal construction which is operable at low differential pressures. The piston and seal construction is further characterized by a bi-directional pressure relief feature that eliminates the possibility of flow blockage in the fluid system in which the apparatus is operating.
Claims14
A fluid flow monitoring apparatus including a fluid metering cylinder;
- piston means mounted for reciprocation in said cylinder;
- and a low friction peripheral seal on said piston that functions as a bi-directional pressure relief means and that is normally flexed on one side of center during piston travel in one direction and shiftable to a pressure relief position on the other side of center responsive to pressure of said fluid flow upon arresting of said piston travel, said seal being normally flexed on said other side of center during piston travel in the other direction and shiftable to a second pressure relief position upon arresting of the piston travel.
A fluid flow monitoring apparatus including a fluid metering cylinder;
- piston means mounted for reciprocation in said cylinder;
- a low friction peripheral seal on said piston that functions as a bi-directional pressure relief means and that is normally flexed on one side of center during piston travel in one direction and shiftable to a pressure relief position on the other side of center responsive to pressure of said fluid flow upon arresting of said piston travel, said seal being normally flexed on said other side of center during piston travel in the other direction and shiftable to a second pressure relief position upon arresting of the piston travel;
- and annular slideable stabilizing shoulder means on said piston adjacent said flexible peripheral seal.
A fluid flow monitoring apparatus including a fluid metering cylinder;
- piston means mounted for reciprocation in said cylinder and including right and left piston portions each of which includes a seal mounting shoulder means;
- a low friction flexible seal including a seal base portion mounted on said seal mounting shoulder means and a peripheral wiping edge;
- and adjusting means for varying the distance between said piston portions and the resulting force exerted by said seal mounting shoulders on said seal base portion.
A fluid flow monitoring apparatus including a fluid metering cylinder;
- piston means mounted for reciprocation in said cylinder;
- a low friction peripheral seal on said piston that functions as a bi-directional pressure relief means and that is normally flexed on one side of center during piston travel in one direction and shiftable to a pressure relief position on the other side of center responsive to pressure of said fluid flow upon arresting of said piston travel, said seal being normally flexed on said other side of center during piston travel in the other direction and shiftable to a second pressure relief position upon arresting of the piston travel;
- means forming a sump containing a liquid lubricant;
- passage means for delivering lubricant from said sump to said seal;
- and pump means actuated by movement of said piston for propelling lubricant through said conduit means.
2 more elements
A fluid flow monitoring apparatus including a fluid metering cylinder;
- piston means mounted for reciprocation in said cylinder;
- a low friction peripheral seal on said piston that functions as a bi-directional pressure relief means and that is normally flexed on one side of center during piston travel in one direction and shiftable to a pressure relief position on the other side of center responsive to pressure of said fluid flow upon arresting of said piston travel, said seal being normally flexed on said other side of center during piston travel in the other direction and shiftable to a second pressure relief position upon arresting of the piston travel;
- annular slideable stabilizing shoulder means on said piston adjacent said flexible peripheral seal;
- means forming a sump containing a liquid lubricant;
- passage means for delivering lubricant from said sump to said seal;
- and pump means actuated by movement of said piston for propelling lubricant through said conduit means.
3 more elements
A fluid flow monitoring apparatus including a fluid metering cylinder;
- piston means mounted for reciprocation in said cylinder and including right and left piston portions each of which includes a seal mounting shoulder means;
- a low friction flexible seal including a seal base portion mounted on said seal mounting shoulder means and a peripheral wiping edge;
- adjusting means for varying the distance between said piston portions and the resulting force exerted by said seal mounting shoulders on said seal base portion;
- means forming a sump containing a liquid lubricant;
- passage means for delivering lubricant from said sump to said seal;
- and pump means actuated by movement of said piston for propelling lubricant through said conduit means.
3 more elements
Dependencies are inferred from the claim text.