Patent ID: 9022057
Filing Date: 2015-05-05
Classification: B05B,B08B,E03F,F16K,Y10T

Abstract:
1. In a piping cleaning apparatus having a high pressure fluid cleaning nozzle attached to a flexible hose for passage through a length of piping to a location requiring cleaning, a flow actuated switching valve connected between the hose and the cleaning nozzle, the switching valve comprising: a valve body having an inlet portion configured to be connected to the hose, a mid portion, an outlet portion configured to be connected to the cleaning nozzle, and a central axial bore therethrough, the mid portion having a plurality of rearwardly directed ports connected by passages to the central axial bore; an elongated poppet member slidably disposed in the central axial bore, the poppet member having a rear portion, a spool portion for selectively opening and closing the passages in the mid portion of the valve body and a closed end portion forming a valve disc for closing the outlet portion of the valve body; a bias member between the poppet member and the valve body biasing the poppet member rearward; and a guide member between the rear portion of the poppet member and the valve body for guiding the poppet member between first and second rotary positions when fluid flow through the valve drops below a predetermined flow rate threshold and then returns above the flow rate threshold.