Back-pressure safeguard

摘要

The backflow prevention device consists of a funnel-shaped membrane and a clamping device for mounting in a pipe. The clamping device consists of a spread member expanding the membrane to the pipe cross section and pressing it against the pipe wall, and a support member supporting the spread member against the pipe wall.

主权项

1. A backflow prevention device consisting of an elastomeric element to be arranged in an interior of a pipe and a clamping device for securing the elastomeric element in the pipe,
the elastomeric element having a shape of a conical bag with an open end to be arranged in the pipe toward the backflow, and a closed end, the clamping device comprising
a support portion arranged radially outside the open end of the elastomeric element and being supported by the pipe anda spread portion being supported by the support portion and being arranged inside the open end, the spread portion comprising a screw mechanism to increase a circumference of the clamping device, thereby pressing a respective portion of the elastomeric element towards the pipe.