CN218935366U - Pilot-operated three-way flow control valve - Google Patents

Abstract

The utility model belongs to the technical field of control valve structure design, in particular to a pilot-operated three-way flow control valve. Including valve body, bonnet, valve seat, valve stem, main valve core, flow-limiting spool, and flow-limiting seat; the valve body is a cross-shaped pipe structure, including inlet pipe, outlet pipe, installation pipe and overflow pipe; valve cover and the valve seat are respectively connected at the opening of the installation pipe and the overflow pipe; the main valve core includes the first core body; the application has a simple and compact structure, is easy to use, has the structural characteristics and use methods of the traditional throttle valve, and has good maintainability. The control valve has few parts and is easy to use. It can directly replace the existing throttle valve to realize the bypass function. Compared with adding a new throttle valve, it does not need to change the original transmission pipeline structure and does not affect the original system. operation, and low operating and maintenance costs.

Description

A pilot-operated three-way flow control valve

technical field

The utility model belongs to the technical field of control valve structure design, in particular to a pilot-operated three-way flow control valve.

Background technique

Flow control valve is a very common node control device in various pipelines and transmission systems. In some application scenarios, such as medium detection, pressure control, etc., it is required to lead out a branch with stable output on the main transmission path; the The branch requires continuous and stable small flow bypass output in the process of large flow transmission and adjustment in the main transmission path; the traditional method is to directly use a small throttle valve to connect to the main transmission path, which requires the addition of new pipelines and Joints, which complicate the structure of the control system and increase additional implementation costs. At the same time, due to the need to open a new interface on the Zhu transmission path, the integrity of the pipeline will decrease and the leakage points will increase, which will bring great harm to the stability of the system. Negative Effects.

Utility model content

The purpose of this utility model is to realize the pilot-operated bypass flow control by introducing the active control structure of the double spool on the basis of the traditional three-way flow control valve, and realize the flow adjustment of the main transmission path and the small flow of the bypass by using a single valve. Stable output.

In order to achieve the above object, the utility model adopts the following technical solutions.

A pilot-operated three-way flow control valve, comprising a valve body 1, a valve cover 2, a valve seat 3, a valve stem 4, a main valve core 5, a flow-limiting valve core 6, and a flow-limiting seat 7;

The valve body 1 is a cross-shaped pipe structure, including a horizontal inlet pipe 10 and an outlet pipe 13, and a vertical installation pipe 11 and an overflow pipe 12;

The valve cover 2 and the valve seat 3 are respectively connected to the upper opening of the installation pipe 11 and the lower opening of the overflow pipe 12 through a bolt group;

The center of the valve cover 2 is provided with a valve stem installation hole 2a, and the valve stem 4 is installed in the valve stem installation hole 2a so that it can move up and down;

The main valve core 5 is fixed on the lower end of the valve stem 4, and the main valve core 5 includes a first core body 50 that can block the communication port between the inlet pipe 10 and the overflow pipe 12;

The flow limiting seat 7 is installed in the opening of the lower end of the overflow pipe 12. The flow limiting seat 7 includes a flow limiting part 70 at the upper end and a support part 71 at the lower end; The hole 701; the center of the support part 71 is provided with a limiting screw hole 72 coaxially connected with the flow-limiting hole 701, and the outer side of the support part 71 is provided with an outlet hole 73 communicating with the flow-limiting hole 701;

The flow-limiting spool 6 includes a second core body 60 that can block the confluence groove 74 and an adjustment rod 61 that is arranged at the bottom of the second core body 60 and passes through the flow-limiting channel 701 and is inserted into the limit screw hole 72. The adjustment rod 61 The lower end is provided with an external thread to be screwed into the limit screw hole 72 .

A further improvement or preferred implementation of the aforementioned pilot-operated three-way flow control valve further includes a lock nut 8 arranged at the lower end of the adjustment rod 61 , and the upper end of the lock nut 8 abuts against the bottom of the support part 71 to adjust the rod 61 .

A further improvement or preferred implementation of the aforementioned pilot-operated three-way flow control valve, the valve seat 3 is an L-shaped pipe structure, including a connecting pipe connected to the overflow pipe 12 through a bolt group, and a water outlet pipe perpendicular to the connecting pipe head; the bottom of the connecting pipe is provided with an adjustment hole coaxially facing the flow-limiting channel 701, and a sealing bolt 9 is arranged in the adjustment hole.

As a further improvement or preferred implementation of the aforementioned pilot-operated three-way flow control valve, the top of the valve seat 3 is provided with a restrictor seat installation groove, and the lower half of the restrictor 70 is fixed in the restrictor seat installation groove, Insert the upper part into the overflow pipe 12.

As a further improvement or preferred implementation of the aforementioned pilot-operated three-way flow control valve, the bottom of the first core 50 is provided with an upper limit post 51, and the upper limit post 51 extends downward and extends into the overflow pipe 12; The top of the second core 60 is provided with a lower limit post 62 facing the upper limit post 51 .

As a further improvement or preferred implementation of the aforementioned pilot-operated three-way flow control valve, flange connections are provided at the nozzles of the inlet pipe 10 , outlet pipe 13 , installation pipe 11 and overflow pipe 12 .

Its beneficial effects are:

The pilot-operated three-way flow control valve of this application has a simple and compact structure, and is easy to use. It has the structural characteristics and usage methods of a traditional throttle valve, and has good maintainability. , flow-limiting spool and flow-limiting seat construct a transmission structure capable of stable bypass output and convenient adjustment of bypass flow. The control valve has few parts, is easy to use, and has good stability. It can directly replace the existing throttle valve to realize the bypass function. Compared with adding a new throttle valve, it does not need to change the original transmission pipeline structure. , does not affect the operation of the original system, and the use and maintenance costs are low.

Description of drawings

Figure 1 is a front view of a pilot-operated three-way flow control valve;

Fig. 2 is a side view of the pilot-operated three-way flow control valve;

Fig. 3 is a cross-sectional view of a pilot-operated three-way flow control valve;

Wherein the reference signs include:

Valve body 1, inlet pipe 10, installation pipe 11, overflow pipe 12, outlet pipe 13, valve cover 2, valve stem installation hole 2a, valve seat 3, valve stem 4, main valve core 5, first core body 50, Upper limit column 51, flow limiting spool 6, adjusting rod 61, lower limit column 62, flow limiting seat 7, flow limiting channel 701, support part 71, limit screw hole 72, outlet hole 73, confluence groove 74, lock Tighten nut 8, sealing bolt 9.

Detailed ways

Below in conjunction with specific embodiment the utility model is described in detail.

The pilot-operated three-way flow control valve of the utility model is mainly used as throttling and bypass drainage equipment in various liquid fluid transmission systems. Its main structure is shown in Figure 1, Figure 2 and Figure 3, mainly including valve body 1, valve cover 2, valve seat 3, valve stem 4, main valve core 5, flow limiting valve core 6, and flow limiting seat 7;

The valve body 1 is a cross-shaped pipe structure, including a horizontal inlet pipe 10 and an outlet pipe 13, and a vertical installation pipe 11 and an overflow pipe 12;

In specific use, the inlet pipe is connected to the pipeline close to the medium source, the outlet pipe is connected to the subsequent treatment process, the installation pipe is used for support and fixing, and at the same time it is convenient to control the regulating valve, and the overflow pipe is used to lead out the bypass branch. In the specific use process, in order to prevent leakage, necessary sealing treatment should be carried out between the pipelines and their connections, including but not limited to sealing rings and rubber seals. These are the fixed connections of various pipelines and control valves. The conventional treatment methods are not repeated here.

Wherein, the valve cover 2 and the valve seat 3 are respectively connected to the upper opening of the installation pipe 11 and the lower opening of the overflow pipe 12 through a bolt group;

The center of the valve cover 2 is provided with a valve stem installation hole 2a, and the valve stem 4 is installed in the valve stem installation hole 2a so that it can move up and down;

The main valve core 5 is fixed on the lower end of the valve stem 4, and the main valve core 5 includes a first core body 50 that can block the communication port between the inlet pipe 10 and the overflow pipe 12;

The flow limiting seat 7 is installed in the opening of the lower end of the overflow pipe 12. The flow limiting seat 7 includes a flow limiting part 70 at the upper end and a support part 71 at the lower end; The hole 701; the center of the support part 71 is provided with a limiting screw hole 72 coaxially connected with the flow-limiting hole 701, and the outer side of the support part 71 is provided with an outlet hole 73 communicating with the flow-limiting hole 701;

The flow-limiting spool 6 includes a second core body 60 that can block the confluence groove 74 and an adjustment rod 61 that is arranged at the bottom of the second core body 60 and passes through the flow-limiting channel 701 and is inserted into the limit screw hole 72. The adjustment rod 61 The lower end is provided with an external thread to be screwed into the limit screw hole 72 .

In the specific use process, Zhu Faxin is driven to move up and down by controlling the up and down movement of the valve stem 4 to change the size of the flow channel and then control the flow state between the inlet pipe 10 and the outlet pipe 13 . When the main transmission path is in operation, part of the fluid enters the overflow pipe, and the flow limiting valve core moves up and down by turning the adjusting rod 61, thereby changing the flow channel size of the overflow bypass and controlling the overflow flow of the bypass. The flow rate is much smaller than that of the main transmission path. When the position of the overflow spool is fixed, the overflow bypass can continuously output a stable bypass branch flow for use.

In order to keep the position of the overflow spool stable, a locking nut 8 is also provided at the lower end of the adjusting rod 61 in this embodiment, and the upper end surface of the locking nut 8 is against the bottom of the supporting part 71 to lock after the bypass parameters are determined. Adjustment rod 61.

For ease of operation, use and maintenance, the valve seat 3 in this embodiment is a commonly used L-shaped pipe structure, which mainly includes a connecting pipe connected to the overflow pipe 12 through a bolt group, and a water outlet pipe head perpendicular to the connecting pipe; The bottom of the tube is provided with an adjustment hole coaxially facing the flow-limiting channel 701, and a sealing bolt 9 is arranged in the adjustment hole.

Further, in order to facilitate disassembly, a restrictor seat installation groove is provided on the top of the valve seat 3 , the lower part of the restrictor part 70 is fixed in the restrictor seat installation groove, and the upper part is inserted into the overflow pipe 12 .

In particular, in some cases, it is necessary to maintain the bypass tributaries to be able to carry out continuous and stable output without being affected by the transmission status of the main transmission path. The bottom of the first core 50 is provided with an upper limit post 51 , which extends downward and extends into the overflow pipe 12 ; the top of the second core 60 is provided with a lower limit post 62 facing the upper limit post 51 .

In the specific use process, when the bypass channel is opened, the lowest position of the main valve core can be limited by the upper and lower side limit columns, and the minimum closing parameter of the main valve core can be limited by setting the size parameters reasonably, so that the effective flow can be obtained by maintaining the bypass .

In particular, it can also be realized in the following way, that is, constructing a bypass drainage structure, which includes a drainage hole located in the shell wall of the valve body 1 and directly connected with the introduction pipe 10 and the overflow pipe 12 .

In order to facilitate the connection and assembly of pipelines, flange connection parts are respectively provided at the mouths of the inlet pipe 10 , the outlet pipe 13 , the installation pipe 11 and the overflow pipe 12 .

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than limiting the protection scope of the present utility model. Although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art Personnel should understand that the technical solution of the utility model can be modified or equivalently replaced without departing from the essence and scope of the technical solution of the utility model.

Claims (6)

1. A pilot-operated three-way flow control valve is characterized in that it comprises a valve body (1), a valve cover (2), a valve seat (3), a valve stem (4), a main valve core (5), a flow limiting Spool (6), flow limiting seat (7); The valve body (1) is a cross-shaped pipe structure, including a horizontal inlet pipe (10) and an outlet pipe (13), as well as a vertical installation pipe (11) and an overflow pipe (12); The valve cover (2) and the valve seat (3) are respectively connected to the upper opening of the installation pipe (11) and the lower opening of the overflow pipe (12) through a bolt group; A valve stem mounting hole (2a) is provided at the center of the valve cover (2), and the valve stem (4) is mounted in the valve stem mounting hole (2a) so as to be movable up and down; The main valve core (5) is fixed on the lower end of the valve stem (4), and the main valve core (5) includes a first core body (50) that can block the communication port between the inlet pipe (10) and the overflow pipe (12); The flow limiting seat (7) is installed in the opening of the lower end of the overflow pipe (12), and the flow limiting seat (7) includes a flow limiting portion (70) at the upper end and a support portion (71) at the lower end; the top of the flow limiting portion (70) is provided with There is a confluence groove (74), and the center of the confluence groove (74) is provided with a flow-limiting channel (701); the center of the support part (71) is provided with a limit screw hole (72) coaxially connected with the flow-limiting channel (701), and the support part (71) Outflow holes (73) communicated with the flow-limiting channels (701) are provided on the outside; The flow-limiting spool (6) includes a second core (60) that can block the confluence groove (74), and the bottom of the second core (60) passes through the flow-limiting channel (701) and is inserted into the limit screw hole Adjusting rod (61) in (72), the lower end of adjusting rod (61) is provided with external thread to be screwed in the limit screw hole (72). 2. The pilot-operated three-way flow control valve according to claim 1, further comprising a lock nut (8) arranged at the lower end of the adjusting rod (61), the upper end surface of the lock nut (8) abuts against Hold the bottom of the support (71) to adjust the rod (61). 3. The pilot-operated three-way flow control valve according to claim 1, characterized in that, the valve seat (3) is an L-shaped pipe structure, including a connecting pipe connected to the overflow pipe (12) through a bolt group, And the outlet pipe head perpendicular to the connecting pipe; the bottom of the connecting pipe is provided with an adjusting hole coaxially facing the flow-limiting channel (701), and a sealing bolt (9) is arranged in the adjusting hole. 4. The pilot-operated three-way flow control valve according to claim 1, characterized in that, the top of the valve seat (3) is provided with a restrictor seat installation groove, and the lower half of the restrictor (70) is fixed Insert the upper part into the overflow pipe (12) in the mounting groove of the flow limiting seat. 5. The pilot-operated three-way flow control valve according to claim 1, characterized in that, the bottom of the first core (50) is provided with an upper limit post (51), and the upper limit post (51) is downward Extending and protruding into the overflow pipe (12); the top of the second core (60) is provided with a lower limit post (62) facing the upper limit post (51). 6. The pilot-operated three-way flow control valve according to claim 1, characterized in that, the nozzles of the inlet pipe (10), the outlet pipe (13), the installation pipe (11) and the overflow pipe (12) Flange connections are provided respectively.

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