Importance

Loading Importance Indicators...

Abstract

The drain pipe plug device for drain testing includes an elongated elastomeric, flexible, resilient hollow tube which has a central passageway running its length and in communication with a rear portion bearing an inlet and front portion bearing an outlet. These two portions are joined to a narrow diameter more flexible middle portion. The inlet is fitted with a connector adapted to receive water and air hoses. The outlet is fitted with a pressure relief valve, preferably in the form of an open cage bearing a fluid-blocking transverse plate trapped in a transverse internal groove. The plate is by-passed by fluid when the front portion expands sufficiently radially under pressure. The front tube portion has thicker walls than the rear tube portion and collapses first after both have radially expanded under fluid pressure so as to prevent backflow of fluid. The middle portion also expands radially and is flexible enough to facilitate passage of the device into intersecting drain pipes. The front portion is tapered and both front and rear portions are externally ribbed to facilitate sliding the device through drain pipes. The device is durable, efficient and safe.

Loading the Abstract Image...

First Claim