Abstract: The two-way and three-way plug valves disclosed include plug members having O-rings in place in continuous grooves defined by inner and outer side walls and a bottom wall extending therebetween. Recesses are formed at spaced apart points along the O-ring groove inner wall to provide an area into which segments of the O-ring may be displaced during existence of a pressure differential across the O-ring. The O-ring groove inner wall recesses are in fluid communication with one another by means of passages, bores and channels defined by the plug member. Edges along the recesses frictionally engage O-ring segments to restrain same against displacement from the O-ring groove.

Abstract: The dispensing apparatus is especially adapted for metering, mixing and dispensing small "shots" of synthetic resin material in liquid form with a minute percentage of a liquid catalyst for patching defects in wood panels. A hand-held dispensing gun of the apparatus has a static mix tube extending from a mixing chamber in a dispensing head where a single air-operated piston upon trigger actuation simultaneously opens resin and catalyst infeed ports to the mixing chamber. At the same time, trigger actuation connects a control air line from a source of compressed air to a pilot air line to start an air motor which drives resin and catalyst metering pumps. These pumps are driven from a common drive shaft with an adjustable mechanical linkage for adjusting the catalyst-resin metering ratio. The pumps meter resin and catalyst through separate lines to the mix chamber of the dispensing gun. A thermostatically controlled heater preheats the resin as it flows to the dispensing gun.