CN218326411U

CN218326411U - Double-valve-body isolated pressure-limiting valve

Info

Publication number: CN218326411U
Application number: CN202222614940.2U
Authority: CN
Inventors: 徐建军; 倪坤; 陈新辉; 苏振; 吴金生; 程凯
Original assignee: Huangshan Huang Pump Twin Screw Technology Co ltd
Current assignee: Huangshan Huang Pump Twin Screw Technology Co ltd
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2023-01-17
Anticipated expiration: 2032-09-30

Abstract

The utility model discloses a double-valve-body isolated pressure limiting valve, including first valve body (1), the one end of first valve body (1) is connected with second valve body (2), the other end of second valve body (2) is connected with end cover (3), be formed with drain pipe (4) on the lateral wall of first valve body (1), be equipped with case (5) and valve rod (6) in first valve body (1), be equipped with pressure regulating assembly (7) in second valve body (2), case (5) with the one end of valve rod (6) is connected, the other end of valve rod (6) with pressure regulating assembly (7) are connected. The utility model discloses have two valve bodies, can keep apart spring assembly and medium, effectively improve the life of pressure-limiting valve, reduce maintenance and manufacturing cost.

Description

Double-valve-body isolated pressure-limiting valve

Technical Field

The utility model relates to a pressure limiting valve, especially a double-valve body isolated pressure limiting valve.

Background

At present, the traditional single-valve-body pressure limiting valve is generally adopted in conveying of various high-risk medium screw pumps in the industries of petroleum, chemical engineering, environmental protection and the like. The contact between the medium in the pump and the safety valve sealing assembly can cause the sealing damage of the pressure limiting valve assembly to cause the leakage of the safety valve.

The traditional single valve body pressure limiting valve adopts an adjusting bolt to adjust the compression amount of a spring to set the working pressure. The pressure limiting valve spring assembly is arranged in the high-risk medium cavity, is easy to be corroded by high-risk media, is easy to corrode, has poor elasticity and high potential safety hazard due to sealing failure and leakage. When different high-risk media are dealt with, the requirement on material configuration and selection of the pressure limiting valve is high, and the cost is high.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a bivalve body isolation formula pressure limiting valve to solve the technical problem among the prior art, it has two valve bodies, can keep apart spring assembly and medium, effectively improves the life of pressure limiting valve, reduces maintenance and manufacturing cost.

The utility model provides a double-valve-body isolated pressure limiting valve, including first valve body, the one end of first valve body is connected with the second valve body, the other end of second valve body is connected with the end cover, be formed with the drain pipe on the lateral wall of first valve body, be equipped with case and valve rod in the first valve body, be equipped with pressure regulating assembly in the second valve body, the case with the one end of valve rod is connected, the other end of valve rod with pressure regulating assembly connects.

In the above-mentioned double-valve-body isolated pressure limiting valve, preferably, a liquid inlet hole and a valve cavity are formed in the first valve body, a liquid outlet hole is formed in the liquid outlet pipe, the liquid inlet hole and the valve cavity are coaxially arranged, the liquid outlet hole and the valve cavity are vertically arranged, and both the liquid inlet hole and the liquid outlet hole are communicated with the valve cavity.

In the above-mentioned double-valve-body isolated pressure-limiting valve, preferably, a valve port is formed at a transition position of connection between the liquid inlet hole and the valve cavity, one end of the valve core is inserted into and slidably fitted with the liquid inlet hole, and a sealing plate is formed at the other end of the valve core and is abutted against the valve port.

In the aforementioned double-valve-body isolated pressure limiting valve, preferably, a middle cover is arranged between the first valve body and the second valve body, one end of the middle cover is in plug-in fit with the first valve body, a first mounting flange is formed at the other end of the middle cover, the first mounting flange is fixedly connected with the first valve body through a bolt, a valve rod mounting hole is formed in the middle cover, the valve rod is in plug-in and sliding connection with the valve rod mounting hole, and one end of the valve rod is in threaded connection with the valve core.

In the aforementioned double-valve-body isolated pressure limiting valve, preferably, the valve rod is provided with a sealing ring, and the sealing ring is in sliding fit with the valve rod mounting hole.

In the above double-valve-body isolated pressure-limiting valve, preferably, a second connecting flange is formed at one end of the second valve body, the second connecting flange is fixedly connected with the middle cover through a bolt, a screw avoiding hole is formed in an end face of the second connecting flange, a third connecting flange is formed at the other end of the second valve body, and the end cover is fixedly connected with the third connecting flange through a bolt.

In the double-valve-body isolated pressure limiting valve, preferably, the pressure adjusting assembly includes a spring pre-tightening force adjusting nut, a spring, a screw rod and a spring seat, one end of the valve rod, which is far away from the valve core, extends into the second valve body, the outer wall of the end of the valve rod is in threaded connection with the spring pre-tightening force adjusting nut, a stepped hole is formed in the spring seat, the screw rod penetrates through the spring seat, one end of the screw rod is in threaded connection with the valve rod, the other end of the screw rod is abutted against a stepped surface of the stepped hole, one end of the spring is sleeved on the valve rod and abutted against the spring pre-tightening force adjusting nut, and the other end of the spring is abutted against the spring seat.

In the above double-valve-body isolated pressure-limiting valve, preferably, a spring seat limiting ring is formed on one side of the end cover facing the second valve body, a cylindrical boss is formed on the other side of the end cover, a screw avoiding hole is formed on the end cover, and the screw avoiding hole and the screw are arranged coaxially.

Compared with the prior art, the utility model discloses a first valve body, the one end of first valve body is connected with the second valve body, and the other end of second valve body is connected with the end cover, is formed with the drain pipe on the lateral wall of first valve body, is equipped with case and valve rod in the first valve body, is equipped with pressure adjustment assembly in the second valve body, and the case is connected with the one end of valve rod, and the other end and the pressure adjustment assembly of valve rod are connected. The utility model discloses be provided with first valve body and second valve body, hold pressure regulating assembly through the second valve body, make pressure regulating assembly and medium keep apart, effectively protect pressure regulating assembly, prevent that it from corroding, improve its use and wait for life.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Description of reference numerals: the valve comprises a first valve body 1, a second valve body 2, an end cover 3, a liquid outlet pipe 4, a valve core 5, a valve rod 6, a pressure adjusting assembly 7, a liquid inlet hole 8, a valve cavity 9, a liquid outlet hole 10, a valve port 11, a sealing plate 12, a middle cover 13, a first mounting flange 14, a valve rod mounting hole 15, a sealing ring 16, a second connecting flange 17, a screw avoiding hole 18, a third connecting flange 19, a spring pretightening force adjusting nut 20, a spring 21, a screw rod 22, a spring seat 23, a spring seat limiting ring 24, a cylindrical boss 25 and a screw avoiding hole 26.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.

The embodiment of the utility model provides a: as shown in fig. 1, a double-valve-body isolated pressure limiting valve comprises a first valve body 1, one end of the first valve body 1 is connected with a second valve body 2, the other end of the second valve body 2 is connected with an end cover 3, a liquid outlet pipe 4 is formed on the side wall of the first valve body 1, the liquid outlet pipe 4 is perpendicular to the first valve body 1, a valve core 5 and a valve rod 6 are arranged in the first valve body 1, a pressure adjusting assembly 7 is arranged in the second valve body 2, the valve core 5 is connected with one end of the valve rod 6, and the other end of the valve rod 6 is connected with the pressure adjusting assembly 7.

One end of the first valve body 1 far away from the second valve body 2 is provided with a connecting flange, the first valve body 1 can be connected with a screw pump or other pump bodies through the connecting flange, the first valve body 1 and the second valve body 2 are coaxially arranged, the pressure adjusting assembly 7 is arranged in the second valve body 2, and the pressure adjusting assembly 7 can be isolated from high-risk media, so that the pressure adjusting assembly 7 is prevented from being corroded, the service life of the pressure adjusting assembly is prolonged, and meanwhile, the conditions of liquid leakage and the like can be effectively prevented.

In a specific embodiment, a liquid inlet hole 8 and a valve cavity 9 are formed in the first valve body 1, a liquid outlet hole 10 is formed in the liquid outlet pipe 4, the liquid inlet hole 8 is coaxially arranged with the valve cavity 9, the liquid outlet hole 10 is vertically arranged with the valve cavity 9, that is, the axis of the liquid outlet hole 10 is vertical to the axis of the valve cavity 9, and both the liquid inlet hole 8 and the liquid outlet hole 10 are communicated with the valve cavity 9. The valve chamber 9 is at the same time also in communication with the inner chamber of the second valve body 2.

Furthermore, a valve port 11 is formed at the connection transition position of the liquid inlet hole 8 and the valve cavity 9, one end of the valve core 5 is inserted into the liquid inlet hole 8 and is in sliding fit with the liquid inlet hole 8, a sealing plate 12 is formed at the other end of the valve core 5, and the sealing plate 12 is abutted against the valve port 11. When the sealing plate 12 is abutted to the valve port 11, the sealing plate is in a sealing state at the moment, when the pressure in the screw pump exceeds a preset value, the medium pushes the valve core 5 rightwards to separate the sealing plate 12 from the valve port 11, the medium flows into the valve cavity 9 at the moment and is discharged through the liquid outlet hole 10 to realize pressure relief, the valve core 5 is driven to move leftwards under the action of the pressure regulating assembly 7 after the pressure is reduced, and meanwhile, the sealing plate 12 is abutted to the valve port 11 to realize sealing.

Further, be provided with well lid 13 between first valve body 1 and the second valve body 2, the one end and the first valve body 1 cooperation of pegging graft of well lid 13, the other end of well lid 13 is formed with first mounting flange 14, offer the screw hole that is arranged in the installation lid and the screw hole that is used for installing second valve body 2 on the terminal surface of first valve body 1, first mounting flange 14 passes through bolt fixed mounting on first valve body 1, be formed with valve rod mounting hole 15 on the well lid 13, valve rod mounting hole 15 and the coaxial arrangement of valve pocket 9, valve rod 6 pegs graft and sliding connection with valve rod mounting hole 15, the one end and the 5 threaded connection of case of valve rod 6. The valve rod 6 is provided with a sealing ring 16, and the sealing ring 16 is in sliding fit with the valve rod mounting hole 15.

The processing difficulty of the second valve body 2 can be reduced through the middle cover 13, the middle cover 13 is mainly used for guiding the valve rod 6, and through the matching of the sealing ring 16 and the valve rod mounting hole 15, a medium entering the valve cavity 9 cannot enter the inner cavity of the second valve body 2 through the valve rod mounting hole 15, so that the sealing effect is realized. With first valve body 1, well lid 13, the design of second valve body 2 for detachable construction, convenient production and processing makes things convenient for dismouting and maintenance moreover, can reduce the maintenance cost.

Further, a second connecting flange 17 is formed at one end of the second valve body 2, a first through hole is formed in the second connecting flange 17, as mentioned above, a threaded hole for mounting the second valve body 2 is formed in the end surface of the first valve body 1, and when it is desired to mount the second connecting flange 17, a bolt thereof must penetrate through the middle cover 13, so that a second through hole one-to-one corresponding to the first through hole in the second connecting flange 17 is also formed in the middle cover 13, and the bolt for mounting the second valve body 2 penetrates through the second connecting flange 17 and the first flange 14 and is in threaded connection with the threaded hole at the end of the first valve body 1, a screw avoiding hole 18 is formed in the end surface of the second connecting flange 17, the screw avoiding hole 18 is used for avoiding the bolt for mounting the middle cover 13, a third connecting flange 19 is formed at the other end of the second valve body 2, and the end cover 3 is fixedly connected with the third connecting flange 19 through the bolt.

Further, the pressure adjusting assembly 7 comprises a spring pre-tightening force adjusting nut 20, a spring 21, a screw rod 22 and a spring seat 23, one end of the valve rod 6, which is far away from the valve core 5, extends into an inner cavity of the second valve body 2, the outer wall of the end of the valve rod 6 is in threaded connection with the spring pre-tightening force adjusting nut 20, a step hole is formed in the center of the spring seat 23, the screw rod 22 penetrates through the spring seat 23 through the step hole, one end, with a smaller diameter, of the step hole is located on one side where the valve rod 6 is located, one end, with a larger diameter, of the step hole is located on one side where the end cover 3 is located, a threaded hole is formed in the end of the valve rod 6, one end of the screw rod 22 is in threaded connection with the valve rod 6, the other end of the screw rod 22 abuts against a step surface of the step hole, one end of the spring 21 is sleeved on the valve rod 6 and abuts against the spring pre-tightening force adjusting nut 20, and the other end of the spring 21 abuts against the spring seat 23.

Furthermore, a spring seat limiting ring 24 is formed on one side, facing the second valve body 2, of the end cover 3, a cylindrical boss 25 is formed on the other side of the end cover 3, a screw avoiding hole 26 is formed in the end cover 3, and the screw avoiding hole 26 and the screw 22 are coaxially arranged. The cylindrical bosses 25 are provided to increase the length of the screw relief hole 26 so that the screw 22 can have a sufficient moving space.

The utility model discloses a use method: when the screw pump is used, the first valve body 1 is fixedly installed on a screw pump through a bolt, a medium enters the first valve body 1 through the liquid inlet hole 8, when the thrust of the medium to the valve core 5 is smaller than a preset pressure, the valve core 5 cannot be pushed, when the thrust of the medium to the valve core 5 is larger than the preset pressure, the valve core 5 moves rightwards and compresses the spring 21, the sealing plate 12 is separated from the valve port 11, the medium flows into the valve cavity 9 through the valve core and is discharged through the liquid outlet hole 10, pressure relief is realized, the medium in the valve cavity 9 cannot enter the inner cavity of the second valve body 2 under the action of the sealing ring 16, namely the spring 21, the screw 22, the spring seat 23 and other parts cannot contact the medium, after the pressure in the screw pump is reduced, the valve core 5 is pushed back to the original position under the action of the spring 21, and the sealing plate 12 is abutted to the valve port 11. It should be noted here that the valve core 5 is a conventional valve core, and the medium enters the valve core from the central hole of the valve core 5 and flows out from the liquid outlet hole on the side wall of the valve core 5, and the valve core 5 can be purchased directly. When the valve core 5 and the valve rod 6 move rightwards, the screw 22 also moves rightwards at the same time, and the right end of the screw 22 enters the screw avoidance hole 26. The screw 22 mainly functions to connect the spring seat 23 and the valve rod 6 while ensuring that the valve rod 6 always moves in the axial direction.

The description of pressure limiting pressure adjustment, when pressure limiting pressure needs to be adjusted, only the spring pre-tightening force adjusting nut 20 needs to be rotated, and the closer the spring pre-tightening force adjusting nut 20 is to the spring seat 23, the larger the force required by the medium to push the valve core 5 is.

The structure, features and effects of the present invention have been described in detail above according to the embodiment shown in the drawings, and the above description is only the preferred embodiment of the present invention, but the present invention is not limited to the implementation scope shown in the drawings, and all changes made according to the idea of the present invention or equivalent embodiments modified to the same changes should be considered within the protection scope of the present invention when not exceeding the spirit covered by the description and drawings.

Claims

1. The utility model provides a double-valve-body isolated pressure limiting valve, includes first valve body (1), its characterized in that: the improved valve is characterized in that one end of the first valve body (1) is connected with a second valve body (2), the other end of the second valve body (2) is connected with an end cover (3), a liquid outlet pipe (4) is formed on the side wall of the first valve body (1), a valve core (5) and a valve rod (6) are arranged in the first valve body (1), a pressure adjusting assembly (7) is arranged in the second valve body (2), the valve core (5) is connected with one end of the valve rod (6), and the other end of the valve rod (6) is connected with the pressure adjusting assembly (7).

2. The dual-valve-body isolated pressure limiting valve of claim 1, wherein: a liquid inlet hole (8) and a valve cavity (9) are formed in the first valve body (1), a liquid outlet hole (10) is formed in the liquid outlet pipe (4), the liquid inlet hole (8) and the valve cavity (9) are coaxially arranged, the liquid outlet hole (10) is perpendicularly arranged in the valve cavity (9), and the liquid inlet hole (8) and the liquid outlet hole (10) are communicated with the valve cavity (9).

3. The dual-valve-body isolated pressure limiting valve of claim 2, wherein: a valve port (11) is formed at the transition position of the connection between the liquid inlet hole (8) and the valve cavity (9), one end of the valve core (5) is inserted into the liquid inlet hole (8) and is in sliding fit with the liquid inlet hole, a sealing plate (12) is formed at the other end of the valve core (5), and the sealing plate (12) is abutted to the valve port (11).

4. The dual-valve-body isolated pressure limiting valve of claim 3, wherein: first valve body (1) with be provided with well lid (13) between second valve body (2), the one end of well lid (13) with the cooperation of pegging graft of first valve body (1), the other end of well lid (13) is formed with first mounting flange (14), first mounting flange (14) through the bolt with first valve body (1) fixed connection, be formed with valve rod mounting hole (15) on well lid (13), valve rod (6) with grafting and sliding connection of valve rod mounting hole (15), the one end of valve rod (6) with case (5) threaded connection.

5. The dual-valve-body isolated pressure limiting valve of claim 4, wherein: and a sealing ring (16) is arranged on the valve rod (6), and the sealing ring (16) is in sliding fit with the valve rod mounting hole (15).

6. The dual valve body isolation type pressure limiting valve of claim 5 wherein: the one end of the second valve body (2) is formed with second flange (17), second flange (17) pass through the bolt with well lid (13) fixed connection, screw dodge hole (18) have on the terminal surface of second flange (17), the other end of the second valve body (2) is formed with third flange (19), end cover (3) pass through the bolt with third flange (19) fixed connection.

7. The dual-valve-body isolated pressure limiting valve of claim 6, wherein: the pressure adjusting assembly (7) comprises a spring pre-tightening force adjusting nut (20), a spring (21), a screw rod (22) and a spring seat (23), one end, far away from the valve core (5), of the valve rod (6) extends into the second valve body (2), the outer wall of the end of the valve rod (6) is connected with the spring pre-tightening force adjusting nut (20) in a threaded mode, a step hole is formed in the spring seat (23), the screw rod (22) penetrates through the spring seat (23), one end of the screw rod (22) is connected with the valve rod (6) in a threaded mode, the other end of the screw rod (22) is abutted to the step surface of the step hole, one end of the spring (21) is sleeved on the valve rod (6) and abutted to the spring pre-tightening force adjusting nut (20), and the other end of the spring (21) is abutted to the spring seat (23).

8. The dual valve body isolation type pressure limiting valve of claim 7 wherein: end cover (3) orientation one side of second valve body (2) is formed with spring holder spacing ring (24), the opposite side of end cover (3) is formed with cylindric boss (25), be formed with screw rod dodge hole (26) on end cover (3), screw rod dodge hole (26) with screw rod (22) coaxial arrangement.