B - Operations – Transporting – 65 – B
Patent
B - Operations, Transporting
65
B
226/53, 226/64.3
B65B 39/00 (2006.01) B65B 3/12 (2006.01) B65B 3/32 (2006.01) B65D 3/12 (2006.01) G01F 11/02 (2006.01)
Patent
CA 2014993
A dispensing valve assembly and system for viscous materials includes a dispensing valve including a valve casing and a valve element slideably mounted therein. The casing has an interior chamber with a dispensing port and a valve passageway extends longitudinally from a first opening at the chamber to a second opening at the casing exterior on inlet opening extends through a side of the casing to intersect the valve passageway and to connect to a source of material to be dispensed. First and second seals are on either side of the inlet port in the valve passageway. The valve element includes a drive shaft portion, an elongated piston head portion and a waisted portion interconnecting the drive shaft and piston head. The waisted portion has a longitudinal length greater than the longitudinal distance between the inlet port and the first seal proximate the first opening. The valve element reciprocates over a cycle whereby as the valve element advances from a fully closed portion toward the fully open position, the piston head moves into the chamber and the waisted portion interrupts the first seal allowing material to flow into the chamber and out of the dispensing port. As the valve element advances from the fully open position toward the fully closed position, the seal is again established to shut off material flow. Continued advancement retracts the piston head further from the chamber to create a negative pressure that draws back material from the dispensing port to cause a clean cut off of flow. Preferably a metering port and a metering cylinder are employed. The metering port extends through the casing and is located between the inlet port and the first opening. A third seal is provided in the valve passageway, also between the inlet port and the first opening. During advancement of the valve element, the waisted portion first allows material flow from the source into the metering cylinder by breaking the second seal after which the source is sealed off and the metering cylinder is opened to the chamber by continued advancement of the waisted portion which breaks the first seal.
Reagent Chemical & Research Inc.
Smart & Biggar
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