Abstract: A three-way valve for high pressures and having a plug member rotatable within a valve housing. A seal arrangement is offset from the plug member to define a space in which system fluid pressure may be trapped for the purpose of acting on the plug member to offset system fluid pressure applied in an opposite direction to the plug member. Accordingly, frictional engagement of the plug member with the valve housing is reduced.

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.