Fluid handling – Systems – Multi-way valve unit
Patent
1998-08-18
2000-04-25
Fox, John
Fluid handling
Systems
Multi-way valve unit
251283, F16K 3904
Patent
active
060532041
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field Of The Invention
This invention relates generally to valves, specifically throttle disc valves for maintaining required parameters in industrial processes, e.g., in heat power engineering at power plants for regulating feedwater discharge in a steam generator.
2. Prior Art
A prior art regulation disc valve with an external discharging device (SU 731163, 1978) works with a pressure differential of up to 20 MPa. The valve design is too complicated for production and servicing, which makes it less reliable. It also has limited flow capacity.
Another regulation disc valve with an internal discharging device (SU 987257, 1983) comprises a body containing a fixed seat with peripheral ports and a central channel. The fixed seat is in constant contact against a slide, which has notches. The slide is connected to a spindle and cylinder, and communicates with an intake chamber and a drainage chamber. A piston positioned in the cylinder cooperates with the cylinder to form a discharge chamber. The shortcomings include complicated design, insufficient reliability, and limited flow capacity.
A considerable shortcoming of these and other discharging type disc valves is the poor relationship between the slide-to-seat clamping force and off-loading force during valve opening and when the port area changes. This may result in the slide breaking away from the seat, an uncontrolled increase of the working medium flow rate, vibration, and premature failure.
OBJECTS OF THE INVENTION
The objects of the present regulation disc valve with discharging device are improved reliability, and overcoming the limited flow capacity when high differential pressure is applied to the valve.
BRIEF SUMMARY OF THE INVENTION
These objects are achieved with a regulation disc valve with a dedicated discharging device which provides an optimal relationship between the slide-to-seat clamping force and off-loading force at any port area in the area range of 0<Fpr.ltoreq.Fmax (where Fpr=port area, and Fmax=maximum port area for that standard size valve) and any pressure change in the intake and drainage chambers.
The present regulation disc valve with discharging device comprises a body containing an easily removable fixed seat with peripheral ports and a central channel; a rotary disc slide with notches and a central longitudinal aperture constantly engaging the seat; a spindle; and a lid comprising a cylinder. A piston permanently connected to the slide cooperate with the cylinder to form a discharge chamber, which is in turn connected to a drainage cavity. On the sealing surface of the slide is an intermediate chamber formed by sectorial notches that interact with the central channel of the seat.
The present invention provides the following advantages: the field where the valve is installed. located in the discharge chamber. maintained at a relatively constant level. excluded. medium. decreases proportionally to the degree of valve opening.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING
FIG. 1 is a sectional view ol a regulation disc valve with discharging device.
FIG. 2 is an enlarged view of a slide with a seat in a closed position.
FIG. 3 is an enlarged view of the slide with the seat in an opened position.
FIG. 4 is a sectional view of seat along line A--A.
FIG. 5 shows alternative bodies of the regulation disc valve.
DETAILED DESCRIPTION OF THE INVENTION
Valve body 1 contains a seat 2 with peripheral passage ports 3 and a rotary disc slide 4 with notches. Ports 3 are for passing a regulated working medium. A spindle 5 and a lever 6 transmit torque from an actuator (not shown) to slide 4. A piston 7, which is fixedly connected to slide 4, and cylinder 8 form a discharge chamber 9. Discharge chamber 9 is connected with a drainage cavity 11 by a channel 10 and an intermediate chamber 12. Intermediate chamber 12 is formed as sectorial notches on the seating surface of slide 4, and communicates with a central channel 13 of seat 2. A working medium enters an intake chamber 14 of the valve. P
REFERENCES:
patent: 4186773 (1980-02-01), Flynn
patent: 5063954 (1991-11-01), Hendrick
Fox John
Lo Jack
LandOfFree
Regulation disc valve with discharging device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Regulation disc valve with discharging device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Regulation disc valve with discharging device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-985562