CN217559082U

CN217559082U - Control valve

Info

Publication number: CN217559082U
Application number: CN202122202370.1U
Authority: CN
Inventors: 于忠伟; 陈子强
Original assignee: Emerson Process Management Tianjin Valves Co Ltd
Current assignee: Emerson Process Management Tianjin Valves Co Ltd
Priority date: 2021-09-10
Filing date: 2021-09-10
Publication date: 2022-10-11
Anticipated expiration: 2031-09-10

Abstract

A control valve has a valve body including an inlet, an outlet, an orifice, and a first flow passage extending downwardly from the inlet to the outlet. The port extends into a portion of the valve body and opens into the first flow passage. The port includes a second flow passage aligned with the longitudinal axis of the valve body and a seat ring. The operating member extends through the aperture and is operatively coupled to a control member disposed in the first flow passage. The operating member is configured to move the control member between the closed position and the open position to open and close the second flow path.

Description

Control valve

Technical Field

The present disclosure relates to control valves and, more particularly, to a three-way control valve having a self-venting flow passage.

Background

The conventional three-way control valve 10 generally includes, for example, a valve body 11 having an inlet 12, an outlet 14, and an injection port 16, as shown in FIG. 1. Fluid flows into inlet 12 and out of outlet 14, with approximately 80% of the fluid flowing out of outlet 14. The injection port 16 typically includes a nozzle that injects fluid flowing into the injection port 16 into a high temperature tank, such as an AP machine (not shown). In one example, the flange 18 of the three-way valve assembly 10 may be used to connect to an AP machine. The fluid is flash evaporated in a high temperature tank to a solid powder.

The injection port 16 is not operational when the control valve 10 is in the closed position for an extended period of time, such as several hours. The fluid, such as TDI, typically injected by the nozzle of the injection port 16, does not subsequently move within the valve body 11 or the injection port 16, which often results in undesired crystallization of the fluid near the packing and valve stem of the control valve 10. Such fluid crystallization tends to be detrimental and damaging to the packing system of the control valve.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned technical problem of undesired crystallization of a fluid in the vicinity of a packing and a stem of a control valve, according to a first exemplary aspect, a control valve includes a valve body including an inlet, an outlet, an orifice, and a first flow passage extending downward from the inlet to the outlet, and a port extending into a portion of the valve body and opening into a portion of the first flow passage, the port including a second flow passage and a seat ring. The control valve also includes an operating member extending through the aperture of the valve body and operatively coupled to the control member disposed in the first flow passage. The operating member is configured to move the control member between a closed position and an open position to open and close the second flow passage, and the control member is configured to sealingly engage a valve seat of the port in the closed position.

According to a second exemplary aspect of the present disclosure, a control valve includes a valve body including an inlet, an outlet, an orifice, and a first flow passage extending downwardly from the inlet to the outlet, and a port extending into a portion of the valve body and opening into a portion of the first flow passage. The port includes a second flow passage aligned with the longitudinal axis of the valve body and a seat ring. The operating member extends through the aperture of the valve body and is operatively coupled to a control member disposed in the first flow passage. The operating member is configured to move the control member between the closed position and the open position to open and close the second flow path. A bellows system is disposed around the operating member and within the first flow passage.

Further in accordance with any of the foregoing exemplary aspects, the control valve may further include any one or more of the following preferred forms.

According to a preferred form, the valve body may include an upper end provided with the inlet and a lower end provided with the outlet. So configured, the first flow passage extends downwardly from the inlet to the outlet, minimizing fluid retention in the valve body and enabling the first flow passage to self-drain.

According to another preferred form, the port may include an upper end having a transverse axis aligned with and substantially the same as the transverse axis of the outlet of the valve body.

According to another preferred form, the port may include an upper end having a plurality of ribs, each rib coupled to the valve body to support the port within the valve body and including an opening forming a portion of the first flow passage.

According to yet another preferred form, the control valve may further include a packing system disposed around the operating member. Further, a bellows system may be provided around the operating member, adjacent the control member and within the first flow channel. The bellows system may be configured to separate the fluid from the packing system and prevent crystallization of the fluid.

According to yet another preferred form, the valve body may further comprise a transverse axis, wherein the inlet and outlet may be offset from the transverse axis and from each other.

According to yet another preferred form, the valve body may further comprise a longitudinal axis, and wherein the seat ring is movable along the longitudinal axis of the valve body, providing flexibility in the application of the control valve.

According to another preferred form, the port may comprise a diameter and the percentage of the maximum injection flow through the second flow passage of the port to the total flow through the first flow passage of the valve body may be adjustable and dependent on the diameter of the port.

Any one or more of these aspects may be considered separately and/or combined with each other in any functionally appropriate manner. Moreover, any one or more of these aspects may also include and/or be implemented in any one or more of the optional exemplary arrangements and/or features described below. These and other aspects, arrangements, features, and/or technical effects will become apparent upon a detailed review of the drawings and the following description. The control valve structure presented by the present disclosure can minimize any fluid remaining in the valve body and enable the first flow channel to self-empty due in part to gravity.

Drawings

The features of the present disclosure which are believed to be novel are set forth with particularity in the appended claims. The disclosure may best be understood by reference to the following description taken in conjunction with the accompanying drawings, in the several figures of which like reference numerals identify like elements, and in which:

FIG. 1 is a perspective view of a prior art three-way control valve;

FIG. 2 is a cross-sectional view of a control valve according to one aspect of the present disclosure; and

FIG. 3 is a cross-sectional view of another control valve according to another aspect of the present disclosure.

Detailed Description

Generally, a control valve according to the present disclosure includes a valve body having an inlet, an outlet, and a first flow passage extending downwardly from the inlet to the outlet. The port extends into a portion of the valve body and opens into a portion of the first flow passage. The port includes a second flow passage aligned with the longitudinal axis of the valve body and a seat ring. An operating member, such as a sliding stem, extends through the valve body and is operatively coupled to a control member disposed in the first flow passage. The operating member is configured to move the control member between the closed position and the open position to open and close the second flow passage of the port. The control member is configured to sealingly engage a seat ring of the port in the closed position. The downwardly extending first flow passage minimizes any fluid remaining in the valve body and enables the first flow passage to self-empty due in part to gravity. Furthermore, the control valve comprises a bellows system arranged around the operating member and in the first fluid passage of the valve body. So configured, the bellows system prevents crystallization of the fluid in the first flow channel.

More specifically, referring now to FIG. 2, a control valve 100 assembled in accordance with the teachings of an exemplary embodiment of the present disclosure is depicted. The control valve 100 includes a valve body 112, the valve body 112 including an inlet 114, an outlet 116, an orifice 118, a first flow passage 120 extending downward (e.g., in a downward direction) from the inlet 114 to the outlet 116, and a longitudinal axis L. The first flow channel 120 provides a path for process fluid to flow through the control valve 100. The process fluid may be any liquid or gas including, but not limited to, steam, water, natural gas, oil, and/or chemical compounds.

The valve body 112 includes an upper end 112a and a lower end 112b disposed opposite the upper end 112. In this example, the inlet 114 is disposed at the upper end 112a and the outlet 116 is disposed at the lower end 112b, e.g., such that the first flow channel 120 can extend downwardly from the inlet 114 to the outlet 116. So configured, any fluid remaining within the valve body 112 may be minimized and the first flow passage 120 may be self-draining.

As further depicted in fig. 2, the valve body 112 also includes a transverse axis a that extends through the valve body 112 and is perpendicular to the longitudinal axis L. The inlet 114 and outlet 116 of the valve body 120 are offset from each other and from the transverse axis a, as shown. The outlet 116 also includes a transverse axis B, as explained in more detail below. This geometry further enables the first flow channel 120 to extend downwardly from the inlet 114 to the outlet 116 and to self-evacuate with the assistance of gravity.

In addition, an operating member 122, such as a sliding stem, extends into the bore 118 of the valve body 112 and is operatively coupled to a control member 124 disposed in the first flow passage 120. The operating member 122 is configured to move the control member 124 between a closed position (shown in fig. 2) and an open position, as explained in more detail below. The movement of the control member 124 is achieved by coupling the control member 124 to an actuator (not shown) by means of the operating member 122. The actuator moves the operating member 122 along the longitudinal axis L of the valve body 112 to move between the open and closed positions and other intermediate positions.

The control valve 100 also includes a port 126 that extends into the valve body 112 along the longitudinal axis L of the valve body 112 and opens into a portion of the first flow passage 120, such as when the control member 124 is in the open position. The port 126 includes a second flow passage 128 and a seat ring 130, and fluid or gas may flow through the second flow passage 128 when the control member 124 is in the open position.

In the closed position shown in fig. 2, the control member 124 sealingly engages the valve seat 130 to prevent process fluid or gas from passing through the control valve 100 and into the second flow passage 128 of the port 126. In the open position, the control member 124 is lifted from the valve seat 130 to allow process fluid or gas to pass from the inlet 114 to the outlet 116 through the first flow passage 120 and also into the second flow passage 128.

In other words, when the control member 124 is spaced apart from the valve seat 130, fluid or gas flow is permitted through the first and

second flow passages

120, 128. When the control member 124 is seated against the valve seat, in this example, fluid or gas flow is inhibited through the second flow passage 128.

In one example, the port 126 also includes an upper end 126a having a transverse axis C, as shown in fig. 2. The transverse axis C of the port 126 is aligned with and nearly identical to the transverse axis B of the outlet 116, which, for example, helps enable the upper end 126a of the port 126 to act as a seat ring 130 to close in the closed position. While FIG. 2 depicts the upper end 126 and, thus, the seat ring 130 in a particular position within the valve body 112, the upper end 126 of the port 126 and the seat ring 130 are movable in a direction along the longitudinal axis of the valve body 112, such as in a vertical direction, to different positions within the valve body 112, which provides flexibility in the application of the control valve 100. For example, the port 126 may be moved further in an upward direction along the longitudinal axis into the bore 118 of the valve body 112. In another example, the port 126 may be moved in a downward direction along the longitudinal axis, away from the aperture 118 of the valve body 112.

Further, the port 126 includes a diameter D, and the size of the diameter D of the port 126 is related to, for example, the maximum injection flow rate through the second flow channel 128. More specifically, the percentage of the maximum injection flow of the second flow passage 128 through the port 126 to the total flow through the first flow passage 120 of the valve body 112 is adjustable based on the diameter of the port 126.

The control valve 100 also includes a packing system 138 disposed about the operating member 122 (e.g., a stem). As will be understood by those skilled in the art, the packing system 138 may, for example, include first and second packing ring sets (not shown) disposed about the operating member 122 and operating in accordance with known techniques in the control valve art. The control valve 100 may also include a bellows system 140, the bellows system 140 also disposed about the operating member 122, adjacent the control member 124, and within the first flow passage 120. So configured, the bellows system 140, for example, separates the fluid from the packing system 138 and prevents undesired crystallization of the fluid.

Referring now to FIG. 3, another control valve 200 assembled in accordance with the teachings of another exemplary embodiment of the present disclosure is depicted. The control valve 200 includes many of the same features as the control valve 100 of fig. 1, and also includes a curved valve body and a port having a plurality of ribs to help secure the port within the valve body, as explained in more detail below. However, the components of the control valve 200 in fig. 3 that are identical to the components of the control valve 100 of fig. 2 include the reference numeral 100 that is 100 greater than the control valve 100 and will not be explained here for the sake of brevity.

More specifically, referring to fig. 3, the control valve 200 includes a valve body 212 having an inlet 214, an outlet 216, an orifice 218, and a first flow passage 220 extending downwardly from the inlet 214 to the outlet 216, similar to the control valve 100 of fig. 2. However, the valve body 212 is more inclined downward and also includes a curved intermediate portion between the inlet 214 and the outlet 216, for example. The curvature and/or curved intermediate portion also helps to minimize fluid entrapment within the valve body 212.

In addition, the port 226 of the control valve 200 includes an upper end 226a having a seat ring 230 and a plurality of ribs 232. Each rib 234 of the plurality of ribs 232 is coupled to the valve body 212 to help support and secure the port 226 within the valve body 212. In addition, each rib 234 also includes an opening 236 that forms a portion of the first flow passage 120, such as when the control member 224 of the control valve 200 is in either a closed position (as shown in FIG. 3) or an open position (not shown). Such an opening 236, in conjunction with the assistance of gravity, helps to form a self-draining first flow passage 220 of the control valve 200, significantly reducing and minimizing unwanted fluid retention within the valve body 212.

In view of at least the foregoing, it will be appreciated that the

control valve

100, 200 of the present disclosure includes several advantages. As described above, when the

control member

124, 224 is in the closed position, the

bellows system

140, 240 separates and incorporates the fluid with the

packing system

138, 238, preventing unwanted crystallization of the fluid. For at least this reason, damage to the

packing system

138, 238 is also prevented. Further, extending the

first flow path

120, 220 from the

inlet

114, 214 of the

control valve

100, 200 down to the

outlet

116, 216 and gravity assist enables the

first flow path

120, 220 to be self-draining. This self-draining and configuration minimizes fluid retention in the

valve body

112, 212 when the

control member

124, 224 is in the closed position, the

control valve

100, 200 is closed, and/or when fluid flow ceases.

The drawings and description provided herein depict and describe preferred embodiments of control valves for purposes of illustration only. One skilled in the art will readily recognize from the foregoing discussion that alternative embodiments of the components illustrated herein may be employed without departing from the principles described herein. Accordingly, those of skill in the art will understand additional alternative structural and functional designs upon reading the present 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 assemblies disclosed herein without departing from the spirit and scope defined in the appended claims.

Claims

1. A control valve, characterized in that the control valve comprises:

a valve body including an inlet, an outlet, an orifice, and a first flow passage extending downwardly from the inlet to the outlet;

a port extending into a portion of the valve body and opening into the first flow passage, the port including a second flow passage and a seat ring; and

an operating member extending through the orifice of the valve body and operatively coupled to a control member disposed in the first flow passage, the operating member configured to move the control member between a closed position and an open position to open and close the second flow passage, and the control member configured to sealingly engage a valve seat of the port in the closed position.

2. The control valve of claim 1 wherein said valve body includes an upper end provided with said inlet and a lower end provided with said outlet such that said first flow passage extends downwardly from said inlet to said outlet to minimize fluid retention in said valve body and to enable said first flow passage to self-empty.

3. The control valve of any one of claims 1 and 2, wherein the port comprises an upper end having a transverse axis aligned with and substantially the same as a transverse axis of the outlet of the valve body.

4. The control valve of any one of claims 1 and 2, wherein the port includes an upper end having a plurality of ribs, each rib coupled to the valve body to support the port within the valve body and including an opening forming a portion of the first flow passage.

5. The control valve of any of claims 1 and 2, further comprising a packing system disposed around the operating member and a bellows system disposed around the operating member adjacent the control member and within the first flow channel, the bellows system configured to separate fluid from the packing system and prevent crystallization of fluid.

6. The control valve of any of claims 1 and 2, wherein the valve body further comprises a transverse axis, wherein the inlet and the outlet are offset from the transverse axis and are offset from each other.

7. The control valve of any of claims 1 and 2, wherein the valve body further comprises a longitudinal axis, and wherein the seat ring is movable along the longitudinal axis of the valve body, providing flexibility in application of the control valve.

8. The control valve of any of claims 1 and 2, wherein the port comprises a diameter, and a percentage of a maximum injection flow through the second flow passage of the port to a total flow through the first flow passage of the valve body is adjustable and dependent on the diameter of the port.

9. A control valve, characterized in that the control valve comprises:

a port extending into a portion of the valve body and opening into the first flow passage, the port including a second flow passage aligned with a longitudinal axis of the valve body and a seat ring;

an operating member extending through the aperture of the valve body and operatively coupled to a control member disposed in the first flow passage, the operating member configured to move the control member between a closed position and an open position to open and close the second flow passage; and

a bellows system disposed around the operating member and within the first flow passage,

the control member is configured to sealingly engage the seat ring of the port in the closed position.

10. The control valve of claim 9, further comprising a packing system disposed around the operating member, wherein the bellows system is configured to separate fluid from the packing system and prevent crystallization of fluid.

11. The control valve of any one of claims 9 and 10, wherein the valve body comprises an upper end provided with the inlet and a lower end provided with the outlet such that the first flow passage extends downwardly from the inlet to the outlet, thereby minimizing fluid remaining within the valve body and enabling the first flow passage to self-empty.

12. The control valve of any of claims 9 and 10, wherein the port includes an upper end having a plurality of ribs, each rib coupled to the valve body to support the port within the valve body and including an opening forming a portion of the first flow passage.

13. The control valve of any of claims 9 and 10, wherein the valve body further comprises a transverse axis, wherein the inlet and the outlet are offset from the transverse axis and are offset from each other.