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. 20, 2003
Filed:
Nov. 16, 2000
Takuya Ishida, Sanda, JP;
Nippon Pillar Packing Co., Ltd., Osaka, JP;
Abstract
An rear end surface of a slide guide plate extending rearward beyond a valve disc is configured to abut against a rear step surface when the valve disc is moving in a valve-opening direction, thus regulating a movement amount of the valve disc . This prevents the spring from entering such an excessive compressive state that in a valve-opened state it is fully compressed. As a result, even in a case where the spring is made of a synthetic resin, deterioration, due to stress relaxation, in a springing force can be suppressed, to suppress deterioration in a pressing pressure onto the valve disc in the valve-closing direction, thus maintaining stable check valve functions.