Valves and valve actuation – Mechanical movement actuator – Plural dissimilar mechanical movements
Patent
1987-03-05
1988-08-23
Walton, George L.
Valves and valve actuation
Mechanical movement actuator
Plural dissimilar mechanical movements
251 58, 251279, 251305, 74 25, 74 89, F16K 31122, F16K 31528
Patent
active
047655895
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device for regulating or varying the flow characteristic (flow coefficient) of a standard valve or gate having a rotating shaft; it also permits to adjust or vary the resulting torque without changing the features of the actuator.
Butterfly valves or ball valves or rotary valves and, more generally, any isolating or control valves provided with a closing element rotating when actuated, have flow value depending (either linearly, exponentially or in any other way) on the rotation angle of the closing element.
Generally isolating valves have a rotation angle of about or equal to 90.degree. while control valves generally have their shaft rotating from 40.degree. to 75.degree. (for dynamic torque reason).
Furthermore to be noted that globe control valves having a stem linearly moved make possible (with respect to a given size) to achieve an "orifice reduction" by only substituting to the nominal diameter of the plug/seat assembly another plug/seat assembly having a smaller nominal diameter: by way of example, a plug/seat assembly having a reduction factor of 0.6 will permit to restrict the maximum flow by 40%. Presently such a possibility does not exist within any rotating shaft valve, but the hereby described present invention does permit to obtain in a rotating shaft valve an equivalent result through a much simpler system having a better flexibility in use and operating over an extended continuous adjustment range.
In addition the device according to this invention, when provided with a control piston or any other actuator device having a non variable stroke, permits to actuate valves which due to their different sizes have different shaft rotation angles, different strokes or different dynamic torques.
Presently, when one of those parameters: rotation angle, stroke or resultant torque, is modified, the known techniques need to have a new actuator, either entirely or partly substituted for.
The device according to the present invention overcomes those drawbacks while reducing the cost of the parts kept in stock for various needs; it gives the user more possibilities so that the user can more easily vary such parameters as nominal valve aperture or actuation torque. The novelty of this device results from its inherent adjustment facility in allowing correction of any oversizing or undersizing of flow capacities or actuation torque.
FIG. 1 is a cross-sectional view of the device according to this invention.
FIG. 2 is a side view in the direction of A, FIG. 1.
The actuator, for instance a piston, is pushing a primary lever (2) through a clevis (3) located at its upper end. At the lower end of the primary lever (2), there is provided an axis (4) that is linked to a vertically sliding bearing (5) that causes in operation the piston clevis (3) to linearly move while successively crossing points (A), (B) and (C).
The primary lever (2) is pulling (at a point (E)) a secondary lever (6) that is in turn secured (through a key (7)) to the valve shaft (12) at a point (D). The primary lever (2) and the secondary lever (6) are together linked at a point (E) through a rotatable axis that can slide in a keyslot (8).
When the point (E) moves in the keyslot (8) (by simultaneously moving the intermediate mounting plate (9) and the cover (10), the rotation angle .alpha. varies (maximum angle shown in FIG. 2); that angle increases or decreases depending on the adjustment direction and may be set at a minimum angle value (angle .beta. shown in FIG. 2) when the setting is located at E'; such an angle variation does affect by the same value the rotation angle of the control shaft (12) of the valve (13) and then the vane (11), which then corresponds to modifying the nominal flow coefficient through the valve or gate; such an angle variation also modifies also the resulting operation torque F1 or F2 applied to the valve shaft (12) and this is done (device novelty) without any modification of the characteristics (nominal stroke on) of the actuator (1).
1. In the combination of a valve (13) or gate ha
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Dresser Industries Inc.
Walton George L.
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