Rotary control valves with pressure-reducing means
First Claim
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1. A rotary control valve, comprising:
- a casing having a center axis and defining a pair of axially-opposed, inlet and outlet ports;
a valve chamber in said casing, said chamber having a pair of axially-opposed, off-center inlet and outlet orifices operatively and respectively associated with said inlet and outlet ports;
a valve stem extending through said valve chamber and having an axis of rotation coaxial with said center axis for adjustably rotating said chamber in said casing about said axis of rotation;
each orifice being contiguous to and movable into and out of partial and full registration with its cooperating port, and said orifices being shaped for controlling the flow through said ports;
means including said orifices for providing a predetermined pressure reduction for each adjusted angular position of said valve chamber; and
an off-center discharge tube disposed inside said cavity substantially parallel to said stem, and said tube extending between said orifices.
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Abstract
The rotary control valve comprises a casing having a pair of axially-opposed ports. A valve chamber is rotatably mounted in the casing. A stem adjustably rotates the valve chamber for controlling the flow through the ports. The valve chamber has a pair of axially-opposed, off-center orifices, each being contiguous to and movable into and out of partial and full registration with its associated port. An off-center tube is disposed inside chamber and extends between the orifices. A pressure-reducing medium in the valve chamber. The medium includes a plurality of stacked, axially-spaced discs, each having a pattern of axial holes for dividing the flow thereacross.
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Citations
25 Claims
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1. A rotary control valve, comprising:
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a casing having a center axis and defining a pair of axially-opposed, inlet and outlet ports; a valve chamber in said casing, said chamber having a pair of axially-opposed, off-center inlet and outlet orifices operatively and respectively associated with said inlet and outlet ports; a valve stem extending through said valve chamber and having an axis of rotation coaxial with said center axis for adjustably rotating said chamber in said casing about said axis of rotation; each orifice being contiguous to and movable into and out of partial and full registration with its cooperating port, and said orifices being shaped for controlling the flow through said ports; means including said orifices for providing a predetermined pressure reduction for each adjusted angular position of said valve chamber; and an off-center discharge tube disposed inside said cavity substantially parallel to said stem, and said tube extending between said orifices. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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2. A rotary control valve, comprising:
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a casing having a longitudinal center axis and defining a generally cylindrical internal receptacle having a pair of inlet and outlet, axially-opposed flow ports; a rotatable stem extending through said receptacle and having an axis of rotation coaxial with said center axis; a valve control element disposed inside said receptacle and being mounted on said stem for rotation therewith, said element including a valve chamber having a cylindrical sleeve, an upstream circular plate, and a downstream circular plate, said upstream plate having an inlet orifice and said downstream plate having an outlet orifice, each orifice being suitably shaped to provide a desired flow therethrough in relation to the rotation of said stem; and a tubular member disposed inside said valve chamber and extending between said orifices, said member having a bore whose opposite open ends become in full registration with said inlet and outlet flow ports when said valve chamber is in its fully-open position, and when said valve chamber is in its throttling positions, fluid flows in from said inlet port into said valve chamber through said inlet orifice and follows a path outside said tubular member, and fluid flows out from said valve chamber into said outlet port through said outlet orifice. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 25)
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3. A rotary control valve, comprising:
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a casing defining an internal receptacle having a pair of inlet and outlet flow ports; a rotatable stem extending through said receptacle; a valve control element having a valve chamber disposed inside said receptacle and being mounted on said stem for rotation therewith, said valve element including a valve chamber having a cylindrical sleeve, an upstream circular plate, and a downstream circular plate, said upstream plate having an inlet orifice and said downstream plate having an outlet orifice, and each orifice being suitably shaped to provide a desired flow therethrough in relation to the rotation of said stem; a tubular member disposed inside said valve chamber and extending between said orifices, said member having a bore whose opposite open ends become in full registration with said inlet and outlet flow ports when said valve control element is in its fully-open position; and a driver operatively coupled to said valve for rotating said stem and said valve chamber. - View Dependent Claims (23, 24)
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Specification