Self-drilling valve

Details Self-drilling valve Self-drilling valve

1986-08-13

1987-07-28

Chambers, A. Michael

Fluid handling

With repair, tapping, assembly, or disassembly means

Tapping a pipe, keg, or apertured tank under pressure

137317, F16K 4300, F16L 5510

Patent

active

046826246

ABSTRACT:
A self-drilling valve for tapping into water mains is disclosed. The valve provides a through bore providing a valve seat at its forward end and threaded for the remainder of its length. A cutter is located in the bore and provides a threaded head at its rearward end and a relatively long, tubular shank at its forward end. Cutting edges are provided at the forward end of the shank so that when the cutter is rotated and threaded forwardly against the surface of the water main, an opening is cut through the wall thereof. A guiding seal is positioned in the valve seat adjacent to the forward end of the cutter prior to and during the cutting operation to laterally position the forward end of the cutter during the cutting operation. Such seal remains with the cutter as the cutter is retracted so that the shank extends through the seal in all positions and does not have to re-enter the seal. The valve is closed by threading the cutter forward, causing the seal to be positioned within the seat and provide a positive seal between the cutter and housing.

REFERENCES:
patent: 3038484 (1962-06-01), Smith
patent: 3756261 (1973-09-01), Minchhoff
patent: 4111588 (1978-09-01), Herron
patent: 4258742 (1981-03-01), Louthay et al.

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