RICHARD J SAMPSON
Plumbers in Quincy, MA
License number
Massachusetts 12000
Issued Date
Apr 14, 1993
Expiration Date
May 1, 2018
Type
Master Plumber
Address
Address
Quincy, MA 02169
Professional information
Self-Priming Drain Valve
US Patent:
7090194, Aug 15, 2006
Filed:
Jul 27, 2004
Appl. No.:
10/899932
Inventors:
Richard J. Sampson - Quincy MA, US
International Classification:
F16K 51/00
US Classification:
251319, 251144, 222501
Abstract:
Provided is a self-priming drain valve suitable for draining liquid from a tank wherein sediment and other solid matter has accumulated. The valve includes a reverse thread, stem-down to close operation, which allows the valve stem, and attached plug, to disturb the accumulated solid matter that is at rest at the valve's inlet. This disturbing action provides the inertia necessary to disturb the solid matter and begin the free flow of the tank's contents.