B - Operations – Transporting – 05 – B
Patent
B - Operations, Transporting
05
B
18/702
B05B 15/02 (2006.01) B29C 47/10 (2006.01) F16K 11/02 (2006.01)
Patent
CA 1038123
ABSTRACT OF THE DISCLOSURE This invention discloses a self-purging injection valve comprising at least one supply port, at least one purging waste port, an injection port and an injection port barrel, the injection port barrel projecting from the in- jection port through the valve in communication with said supply port and purging waste port, and a valve stem having an internal passage and being adapted to slide within the injection port barrel between a purging position and an injection position, to seal the injection port, to block the direct flow of materials within the injection port barrel external to the valve stem between the supply port and the purging waste port, but to otherwise permit the flow of purging fluids from the supply port along the internal passage and about the valve stem within the injection port barrel to the purging waste port when said valve stem is in the purging position and to open the injection port and to permit the flow of materials from the supply port within and without the valve stem to the injection port when said valve stem is in the injection position, and a valve stem control means to control the movement of the valve stem, and a purging waste port control means to close the purging waste port in the injection position and to open the purging waste port in the purging position.
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