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:
Dec. 11, 1990
Filed:
May. 30, 1990
John Church, Modesto, CA (US);
Victor R Oelschlaegel, Modesto, CA (US);
J Donald Emery, Mariposa, CA (US);
Parker Hannifin Corporation, Cleveland, OH (US);
Abstract
A self-venting drain valve (10) is mounted on a wall (30) of a fluid container having a fluid hole (32) and a vent hole (34). The valve has a body (20) with a bore (38) therein. A first hole (44) and a second hole (46) extend into said bore coaxial with the fluid and vent holes respectively. A drain port (48) extends through the valve body opposite the first hole. An air vent opening (54) extends through the valve body, generally opposite, but slightly offset from the second hole. A rotatable spool (60) is mounted in the bore. The spool has a first ball portion (62) adjacent the fluid hole and a second ball portion (64) adjacent the vent hole. The first and second ball portions of the spool have fluid passages therethrough. In a first position, the fluid passages in the ball portions are disposed from the fluid and vent openings and the valve is closed. Movement of the spool to a second position, enables the fluid passage in the first ball portion of the spool to receive fluid, placing the container under slight negative pressure. Further movement of the spool to a third position, opens the fluid passage through the second ball portion of the spool and enables air to enter the container so it may readily drain.