The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 01, 2001
Filed:
May. 19, 1999
Applicant:
Inventors:
Burkhard Knoell, Lohr, DE;
Winfried Rueb, Neustadt, DE;
Assignee:
Mannesmann Rexroth AG, Lohr, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F15B 1/304 ;
U.S. Cl.
CPC ...
F15B 1/304 ;
Abstract
In a check valve assembly and a valve assembly employing such a check valve assembly, a topping piston may be taken into contact with a main poppet to raise the main poppet from its seat. The main poppet is designed without significant area difference from the valve seat and the topping piston is actuated through a pilot valve, so that the process of raising the main poppet from the valve seat is controllable.