Importance

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Abstract

Subject of the invention is a method and a fastener for closing and sealing ends of pipes subjected to internal pressure, e.g. of plastics pipes tested on internal pressure in suitable apparatus in which a piece of pipe is filled with water with a temperature of about 150.degree. C., and subsequently increased pressure corresponding to required stresses in the pipe wall is established. The method of fixing the fasteners as well as the fasteners themselves should make possible an easy and simple putting them and reliable fixing on the ends of pipes tested as well as their certain sealing. The method according to the invention is characterized by the fact that the fastener elements are clamped on pipe ends by a hydraulic or a pneumatic force. It is profitable if this force stems from the pressure of medium filling the pipe during a test. Essence of the fastener realizing the method according to invention lies in the fact that there is a non-return valve in the fastener frame serving delivering hydraulic or pneumatic pressure into fastener elements, and inside the frame, there is a movable, ring-bottom shaped element which is affected by the pressure, while this movable element, affecting itself the fixing conic ring and an elastic packing, causes fastening of the fastener on the pipe and pipe sealing.

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First Claim