F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
251/36, 251/57
F16K 5/02 (2006.01) F16K 31/50 (2006.01) F16K 41/10 (2006.01)
Patent
CA 1191501
ABSTRACT A control valve is disclosed for precisely controlling the flow of a liquid in a pipe using a housing having liquid inlet and outlet openings and a side opening, with a wall structure across the housing having an opening for passage of liquid from the inlet opening to the outlet opening. A valve closure mechanism is positioned in relation to the opening for controlling flow through the opening, with a flange positioned over the side opening and having a portion extending into the interior of the housing towards the valve closure mechanism, said flange and its extended portion having a circular cross-section opening therethrough, said opening having an interior predetermined pitch thread over a lower portion of its length. There is also provided a primary valve stem rotatably mounted in the circular cross-section opening and having an exter- ior thread adapted to co-act with said interior thread, said valve stem having a concentric circular opening in its lower portion containing an interior pre-determined pitch thread and having an upper portion adapted to be connected to a valve drive system, a secondary valve stem rotatably mounted in the concentric circular opening and having an exterior thread over its upper end adapted to co act with the interior thread in the circular opening in the primary valve stem and having a lower section connected to the valve closure mechanism, and a cylindrical metal bellows position- ed over the primary and secondary valve stems and sealably connect- ed at its upper end to the said flange and at its lower end to the lower end of the secondary valve stem such as to isolate liquid flow in the interior of the valve from the valve stems, said bellows being of a length to allow movement of the primary valve stem from a fully valve closed position to a fully open position.
443372
Astill Cyril J.
R. William Wray & Associates
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