Rotary axial stop valve
阅读说明:本技术 旋转轴向截止阀 (Rotary axial stop valve ) 是由 M·K·洛弗尔 于 2019-07-04 设计创作,主要内容包括:本文公开了一种示例性控制阀,并且其包括阀体,该阀体具有从阀体的上游端面表面延伸到下游端面表面的基本上轴向的流体流动路径。曲柄被设置在阀体内,并且在阀体外部的往复式阀内件耦接到曲柄并邻接阀体的下游端面表面。(An example control valve is disclosed herein and includes a valve body having a substantially axial fluid flow path extending from an upstream face surface to a downstream face surface of the valve body. A crank is disposed within the valve body, and a reciprocating valve trim external to the valve body is coupled to the crank and abuts a downstream face surface of the valve body.)
1. A control valve, comprising:
a valve body having a substantially axial fluid flow path therethrough and having an upstream end face surface and a downstream end face surface;
an axially slidable trim disposed outside the valve body and within the downstream conduit; and
a crank disposed within the valve body, the crank extending outside the valve body to operably couple to the axially slidable trim in the downstream conduit.
2. The control valve of claim 1, wherein the crank comprises a valve control arm disposed within the fluid flow path of the valve body and rotatable about a pivot axis and a valve linkage having a first end and a second end, wherein the first end is operatively coupled to the valve control arm and the second end is operatively coupled to the axially slidable trim.
3. The control valve of claim 1, wherein the axially slidable valve trim comprises a cage and a plug, the cage abutting the downstream face surface, the cage comprising a sidewall defining a cage bore having a cage bore axis, and the cage being arranged such that fluid flowing through the valve body is exhausted through fluid passages in the sidewall.
4. The control valve of claim 3, wherein the cage comprises a valve seat.
5. The control valve of claim 1, wherein the downstream conduit is selected from a pipe segment or a downstream pipeline.
6. The control valve of claim 5, wherein the outlet of the valve body defines a first aperture and the outlet of the downstream conduit defines a second aperture such that the downstream conduit fits the first aperture to the second aperture.
7. The control valve of claim 6, wherein a first diameter of the first bore is smaller than a second diameter of the second bore.
8. The control valve of claim 3, wherein the cage comprises a plurality of orifices that provide a selection of inherent flow characteristics from the group consisting of: linear characteristics, quick open characteristics, and equal percentage characteristics.
9. The control valve of claim 2, wherein at least one of a valve control arm length, a valve linkage length, or a valve control arm starting angle provides a selection of inherent flow characteristics from the group consisting of: linear characteristics, quick open characteristics, and equal percentage characteristics.
10. A fluid valve control element, comprising:
a rotary closure member defining an axis of rotation and operable between a first open position and a second closed position;
an axially slidable fluid control member defining a longitudinal axis and providing flow characteristics of the fluid valve; and
a crank operably connected between the rotating closure member and the axially slidable fluid control member, wherein rotation of the rotating closure member about the axis of rotation between the first open position and the second closed position causes the axially slidable fluid control member to travel along the longitudinal axis.
11. The fluid valve control element of claim 10, wherein the crank comprises a pivotable valve control arm of the rotary closure member and a valve link having a first end and a second end such that the first end of the valve link is operatively coupled to the valve control arm and the second end of the valve link is operatively coupled to the axially slidable fluid control member.
12. A fluid valve control element as defined in claim 10, wherein the axially slidable fluid control member is selected from a variable area flow guide or a cage guided trim.
13. A fluid valve control element as defined in claim 12, wherein the variable area flow guide or cage guided trim is devoid of a valve seat.
14. A fluid valve control element as defined in claim 12, wherein the variable area flow guide or cage guided trim is devoid of fluid seals.
15. The fluid valve control element of claim 10, wherein the rotating closure member is selected from the group consisting of a ball, a disc, a butterfly, and a plug.
16. A valve assembly, comprising:
an isolation valve assembly essentially comprising a valve body having a substantially axial fluid flow path therethrough and a rotary closure member disposed within the valve body; and
a control valve assembly consisting essentially of an axially slidable trim disposed within an adjacent downstream conduit external to the valve body and operatively connected to the isolation valve assembly.
17. The valve assembly of claim 16, wherein the isolating rotary closure member comprises a valve control arm.
18. The valve assembly of claim 17, wherein the isolating rotary closing member is selected from a ball, a disc, a butterfly, or a plug.
19. The valve assembly of claim 17, wherein the axially slidable trim comprises a cage adjacent a downstream face surface of the valve body, a plug, and a valve stem.
20. The valve assembly of claim 16, wherein the downstream conduit is selected from a pipe segment or a downstream pipeline.
21. The valve assembly of claim 20, wherein the outlet of the valve body defines a first bore and the outlet of the tube segment defines a second bore such that the tube segment fits the first bore to the second bore, and wherein a first diameter of the first bore is smaller than a second diameter of the second bore.
22. The valve assembly of claim 16, wherein the axially slidable trim is selected from a variable area flow guide or a cage guided type trim.
23. The valve assembly of claim 19, wherein at least one of a valve control arm length, a valve linkage length, or a valve control arm starting angle provides a selection of an inherent flow characteristic of the valve assembly from the group consisting of: linear characteristics, quick open characteristics, and equal percentage characteristics.
24. The valve assembly of claim 19, wherein the cage includes a plurality of orifices that provide for selection of inherent flow characteristics from the group consisting of: linear characteristics, quick open characteristics, and equal percentage characteristics.
25. A valve, comprising:
a valve body having a substantially cylindrical fluid flow path therethrough and including upstream and downstream end face surfaces and an isolating rotary closure member disposed within the valve body, the isolating rotary closure member operable between a first open position and a second closed position; and
an axially slidable trim disposed outside the valve body and within the downstream conduit and operatively connected to the isolating rotary closure member to control fluid flow through the axial fluid flow path.
26. The valve as defined in claim 25, wherein the axially slidable valve trim comprises a cage and a valve plug, the cage abutting the downstream face surface and comprising a sidewall defining a cage bore having a longitudinal axis.
27. The valve of claim 26, wherein the cage portion is devoid of a valve seat.
28. The valve of claim 26, wherein the valve plug is free of a plug seal assembly located between the valve plug and the cage bore.
29. The valve according to claim 25, wherein the operative connection with the isolating rotary closure member comprises a valve control arm and a valve linkage.
30. A valve according to claim 25, wherein the isolating rotary closing member is selected from a ball, a disc, a butterfly or a plug.
31. The valve of claim 25, wherein the downstream conduit is selected from a pipe segment or a downstream pipeline.
32. The valve of claim 32, wherein the outlet of the valve body defines a first bore and the outlet of the tube segment defines a second bore such that the tube segment fits the first bore to the second bore, and wherein a first diameter of the first bore is smaller than a second diameter of the second bore.
33. The valve of claim 30, wherein at least one of a valve control arm length, a valve linkage length, or a valve control arm starting angle provides a selection of an inherent flow characteristic of the valve assembly from the group consisting of: linear characteristics, quick open characteristics, and equal percentage characteristics.
34. The valve of claim 26, wherein the cage comprises a plurality of orifices that provide a selection of inherent flow characteristics from the group consisting of: linear characteristics, quick open characteristics, and equal percentage characteristics.
Technical Field
The present disclosure relates generally to rotary axial shut-off valve assemblies (rotary axial valve assemblies), and more particularly to a combined isolation control valve assembly.
Background
Control valves are commonly used in process control systems to control the flow of fluid in the system downstream of the control valve. The flow of the control system supply fluid may vary depending on the requirements set on the system. In liquid or gas control valves (collectively, "fluid control valves"), a number of design and performance considerations may be important. For example, a designer of a fluid control valve may be motivated to design a control valve with greater pressure stability and less sensitivity to inlet pressure variations. Furthermore, designers may be motivated to build more compact designs as well as designs that may support simple assembly and service.
Conventional butterfly control valves operate by positioning a disc within a valve body to control fluid flow through the valve body. The disc rotates about a pivot point or axis defined by a shaft mounted within the valve body. Rotation of the disc caused by torque applied to the shaft creates or reduces an opening for fluid flow through the valve body. As the disc rotates from the closed (typically vertical) to the fully open position (typically almost horizontal), the flow area through which fluid can flow increases. Fluid flow may be controlled to some extent by adjusting the angle of rotation of the disc within the valve body. Conventional butterfly valves are generally the most economical of all types of process control valves, with small face-to-face dimensions and low actuator stack heights. Butterfly valves provide relatively high flow capacity for relatively low cost compared to other types of control valves, such as globe valves (globe valves) and ball valves (ball valves). Thus, butterfly valves are very economical for certain applications. In the alternative, conventional butterfly valves have limited application in process control due to their inherent flow properties.
A stop or sliding stem control valve uses the up and down movement of a plug (plug) attached to a valve stem (stem) within the valve body that closes off flow through the valve seat. The shut-off valve facilitates flow regulation. One of the main limitations of a shut-off valve is that the shut-off rating (shut-off) can be smaller than other valves, especially larger sized valves. Also, shut-off valves are typically the largest control valves that have a larger face-to-face dimension than rotary valves and typically have a large actuator stack height due to the increased thrust required to close shut-off.
Alternatively, ball valves are designed with a ball inside the valve body that rotates against a seal and is used for on/off control without pressure drop. In a full-port ball valve, the ball has a hole (hole) through the middle so that flow will occur when the hole is in line with the two ends of the valve. When the valve is closed by rotating the ball 90 degrees, the holes are perpendicular to both ends of the valve and thus flow is prevented. Ball valves are very durable and typically have excellent shutoff capabilities even after years of use. They are generally preferred over shut-off valves in shut-down applications. A major limitation in ball valve applications is the limited range of adjustability due to the large amount of flow permitted by the ball member.
Axial or inline flow control valves are an alternative to control valves with 90 degree turns. Axial flow valves have a flow path or passage through the valve that is substantially straight or parallel to the direction of fluid flow to minimize turbulence through the valve body. Although the flow paths or channels may not be perfectly straight or parallel, the flow paths or channels may include turns that are significantly less than 90 degrees, which may reduce vibration and efficiency losses.
Axial flow control valves typically include an actuator mounted to an outer surface of the valve body. An actuator is operatively coupled to the flow control member of the valve and moves the flow control member between an open position and a closed position to allow or prevent fluid flow through the valve. Some known axial flow control valves actuate a flow control member within the valve body relative to the seat ring to control fluid flow through the valve body. However, axial flow control valves suffer from complex internal actuation mechanisms and expensive maintenance costs.
Finally, an isolation valve is a valve that normally prevents flow to a given location for maintenance or safety purposes. Similar to the performance of rotary butterfly valves in on-off applications, they can also be used to provide flow logic (select one flow path over another) and connect external devices to the system, and they are typically manually operated and can be either a rotary or sliding stem configuration. That is, the valve is classified as an isolation valve due to its intended function in the process line loop rather than due to the design of the valve itself, and traditionally, isolation valves are independent of control valves in the process control loop. Many control valve applications will require two or three isolation valves per control valve for maintenance or safety purposes.
As understood by those of ordinary skill in the art, butterfly valves are more suitable for low cost on-off flow control applications. Stop valves are suitable for applications where cost sensitivity is low and high performance flow regulation is required, whereas ball valves are most often used for high flow, tight shut-off. However, many process control applications require precise flow control and tight shut-offs throughout the operating range of the control valve.
Disclosure of Invention
According to a first exemplary aspect, a control valve includes a valve body having a substantially axial fluid flow path therethrough and having an upstream face surface and a downstream face surface. The control valve includes an axially slidable trim disposed outside the valve body and within a downstream conduit, and a crank disposed within the valve body, wherein the crank extends outside the valve body to be operably coupled to the axially slidable trim in the downstream conduit.
According to a second exemplary aspect, a fluid valve control element includes: a rotary closure member defining or rotatable about an axis of rotation and operable between a first open position and a second closed position; an axially slidable fluid control member defining a longitudinal axis and providing a flow characteristic of the fluid valve; and a crank operatively connecting or coupling the rotating closure member and the axially slidable fluid control member, wherein rotation of the rotating closure member about the axis of rotation between the open position and the closed position causes the axially slidable fluid control member to travel along the longitudinal axis.
According to a third exemplary aspect, a valve assembly comprises: an isolation valve assembly essentially comprising a valve body having a substantially axial fluid flow path therethrough and a rotary closure member disposed within the valve body; and, a control valve assembly. The control valve assembly includes an axially slidable trim disposed within an adjacent or immediately downstream conduit external to the valve body and operatively connected to the isolation valve assembly.
According to a fourth exemplary aspect, a valve comprises: a valve body having a substantially cylindrical fluid flow path therethrough and having upstream and downstream end face surfaces and an isolating rotary closure member disposed within the valve body and operable between a first open position and a second closed position. An axially slidable valve trim is disposed within the downstream conduit outside the valve body and is operatively connected to the isolating rotary closure member to control fluid flow through the axial fluid flow path.
Further according to any one or more of the preceding first, second, third or fourth aspects, the emergency shutdown safety device and/or method may further comprise any one or more of the following preferred forms.
In one preferred form, the crank includes a valve control arm disposed within the fluid flow path of the valve body and pivotable, and a valve linkage having a first end operatively coupled to the valve control arm and a second end operatively coupled to the axially slidable trim.
In another preferred form, the axially slidable valve trim includes a cage portion and a plug portion, the cage portion abutting the downstream end face surface and the cage portion including a sidewall defining a cage bore having a cage bore axis. The cage is arranged such that fluid flowing through the valve body is discharged through the fluid passage in the sidewall.
In another preferred form, the cage includes a valve seat.
In another preferred form, the downstream pipeline is a pipe section (spool piece) or a downstream pipeline.
In another preferred form, the outlet of the valve body defines a first aperture and the outlet of the downstream conduit defines a second aperture such that the downstream conduit fits the first aperture to the second aperture.
In another preferred form, the diameter of the first bore is smaller than the diameter of the second bore.
In another preferred form, the cage includes a plurality of apertures arranged to provide a selection of an inherent flow characteristic selected from the group consisting of: linear characteristics, quick open characteristics, and equal percentage characteristics.
In another preferred form, at least one of the valve control arm length, the valve linkage length, or the valve control arm starting angle is arranged to provide a selection of an inherent flow characteristic selected from the group consisting of: linear characteristics, quick open characteristics, and equal percentage characteristics.
In another preferred form, the axially slidable fluid control member may be a variable area flow guide or a cage guided valve trim.
In another preferred form, the slidable fluid control member is free of a valve seat.
In another preferred form, the slidable fluid control member is devoid of a fluid seal.
In another preferred form, the rotary closure member may be a ball, disc, butterfly or plug.
Drawings
FIG. 1 is a cross-sectional view of a valve assembly showing an axial control element in a closed position according to the teachings of the present disclosure.
Fig. 1A is an enlarged front view of three (3) example valve plugs having fast opening (bottom), equal percentage (middle), and linear flow (top) characteristics assembled in accordance with the teachings of the present disclosure.
FIG. 1B is a cross-sectional view of another valve assembly showing an axial control element assembled in accordance with the teachings of the present disclosure.
FIG. 2 is a cross-sectional view of a valve assembly having a spool piece and showing an axial control element in a closed position and assembled in accordance with the teachings of the present disclosure.
FIG. 3A is a cross-sectional view of a valve assembly having an isolating ball valve assembly and an axial control valve assembly assembled in accordance with the teachings of the present disclosure.
FIG. 3B is a perspective view of a trim assembly having an isolating ball valve assembly and an axial control valve assembly assembled in accordance with the teachings of the present disclosure.
FIG. 4 is a cross-sectional view of a valve assembly having an isolation butterfly valve assembly and an axial control valve assembly assembled in accordance with the teachings of the present disclosure.
Detailed Description
The present disclosure relates generally to rotary axial shut-off valve assemblies and, more particularly, to a combined isolation control valve assembly. For ease of reference, and to the extent possible, identical or similar components described in many embodiments will retain the same basic reference numerals as outlined in the description, but the reference numerals will be incremented by integer multiples of 100. In the following embodiments, the description of many common elements may be abbreviated or even omitted for the sake of brevity.
Referring now to the drawings, FIG. 1 depicts a rotary axial stop valve assembled in accordance with the teachings of the first disclosed example of the present invention. The
The sliding movement of the axially
Further, it should be understood that the seat load of the axially
t torque applied to valve control arm
α angle of valve control arm with respect to longitudinal axis of valve plug when valve plug is fully open
FSeatSeat load
The seating load F of the
The axially
The
More specifically, the
In FIG. 1A, the axially
length of valve connecting rod
Length of the valve control arm
Alpha in the fully open position, the angle of the control arm relative to the valve plug
Travel of x valve plug
It is shown in the above equation x that the travel x, and thus the flow characteristics, of the
FIG. 2 illustrates another example of a rotary axial shutoff valve. The
Fig. 3A and 3B depict another example of a rotary
The
The
Further, the
The axially
FIG. 4 illustrates another example of a rotary axial shutoff valve. Fig. 4 depicts a combined rotary
In addition, the
The axially
A
For purposes of illustration only, the figures and description provided herein depict and describe preferred examples of valve assemblies having flow regulators and flow regulators. One skilled in the art will readily recognize from the foregoing discussion that alternative variations of the components illustrated herein may be employed without departing from the principles described herein. Accordingly, those skilled in the art will appreciate additional alternative structural and functional designs for flow regulators upon reading this disclosure. Thus, while particular embodiments and applications have been illustrated and described, it is to be understood that the disclosed embodiments are not limited to the precise construction and components disclosed herein. Various modifications, changes, and variations apparent to those skilled in the art may be made in the arrangement, operation, and details of the methods and components disclosed herein without departing from the spirit and scope defined in the appended claims.
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