Fluid handling – Larner-johnson type valves; i.e. – telescoping internal valve...
Patent
1998-07-08
2000-02-29
Michalsky, Gerald A.
Fluid handling
Larner-johnson type valves; i.e., telescoping internal valve...
251282, F16K 112
Patent
active
060296917
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to valves for controlling the flow of a fluid (liquids or gasses) through a pipe. The invention is particularly useful with respect to the type of in-line control valve described in our prior U.S. Pat. No. 4,681,130, and is therefore described below with respect to that type of control valve.
The above-cited patent discloses an in-line control valve which is normally open and which is actuated to a closed position by applying a fluid pressure, e.g., the inlet pressure, to two control chambers within the valve both acting together to produce a combined closing force substantially greater than the opening force produced by the inlet pressure applied to the upstream face of the valve member, thereby better assuring fast and safe closure of the valve against the inlet pressure.
An object of the present invention is to provide in-line control valves which may be of similar construction to that of the above-cited patent but which include a number of improvements and variations enabling valves to be constructed for a wide variety of different applications.
According to one aspect of the present invention, there is provided an in-line control valve comprising: a housing having an inlet port, an outlet port downstream of the inlet port, and a valve seat between the two ports; and a valve assembly within the housing; the valve assembly including: a valve member movable towards and away from the valve seat and having an upstream face facing the valve seat and a downstream face facing the outlet port; a valve stem fixed to the valve member and extending downstream thereof; a piston head carried by the valve stem at the downstream end thereof and having a downstream face defining a first control chamber with a first surface of the housing; a cylindrical skirt fixed to and extending downstream of the valve member and enclosing the valve stem but terminating short of the piston head to define a second control chamber with the valve member, the valve stem and a second surface of the housing; a fluid flow passageway through the housing to permit fluid flow therethrough in the open condition of the valve member, a pressure-control passageway through the valve stem establishing communication between the first and second control chambers such that the fluid pressure in the first chamber acts on the downstream face of the piston head tending to move it and the valve member towards the valve seat, and the fluid pressure in the second chamber acts on the upstream face of the valve member and tends to move it and the valve member also towards the valve seat; the upstream face of the piston head and a third surface of the housing defining a third control chamber such that the fluid pressure therein acts on the upstream face of the piston head tending to move it and the valve member towards the open position of the valve member away from the valve seat; and a control port communicating with the third control chamber for applying fluid therein to move the valve member towards its open position away from the valve seat.
According to another aspect of the invention, there is provided a control valve comprising: a housing having an inlet port, an outlet port downstream of the inlet port, and a valve seat between the two ports; and a valve assembly movable within the housing; the valve assembly including a valve member movable towards and away from the valve seat; the valve member having an upstream face facing the valve seat and a downstream face facing the outlet port; the valve seat being of conical configuration increasing in diameter in the downstream direction; the valve member carrying an annular resilient seal engageable with the conical valve seat in the closed position of the valve member; the valve member including an upstream conical valve cover and a downstream valve body of complementary conical configuration, the annular resilient seal including a conical skirt clamped between the conical valve cover and valve body, the annular resilient seal further including a thickened outer periphery havi
REFERENCES:
patent: 3356103 (1967-12-01), Biello et al.
patent: 3945393 (1976-03-01), Teatini
patent: 4681130 (1987-07-01), Tabor
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