Cap with a valve unit

Abstract

A cap is provided with a valve adapted to release negative pressure in the interior of a storage tank. Upon assembly of this negative pressure release valve, while a coil spring bears against the underside of a retainer plate, the retainer plate with a valve body fixedly mounted thereon is first assembled temporarily in a spring retainer plate upon which legs are in engagement with a hole. With this arrangement, a valve unit is formed. Next, the valve unit is positioned at the central portion of a body portion and the peripheral edge portion of the spring retainer plate is fitted in a retainer section of the body portion so as to disengage the legs from the hole in the spring retainer plate. In this state, the valve body retained on the retainer plate is pressed against the underside of a valve hole by the coil spring and thus, is regularly positioned.

Dependencies are inferred from the claim text.