CN212389815U

CN212389815U - Pressure reducing valve

Info

Publication number: CN212389815U
Application number: CN202020674681.0U
Authority: CN
Inventors: 季滔; 汪东明
Original assignee: NINGBO YONGXIANG COPPER PIPELINE CO Ltd
Current assignee: NINGBO YONGXIANG COPPER PIPELINE CO Ltd
Priority date: 2020-04-28
Filing date: 2020-04-28
Publication date: 2021-01-22
Anticipated expiration: 2030-04-28

Abstract

The utility model relates to a pressure reducing valve, which comprises a valve body, a valve rod and a valve cover, wherein the valve rod is positioned in a valve core of the valve body and moves up and down; the valve body is internally provided with a leakage-proof device which is positioned at the lower end of the valve core and is connected with the lower end of the valve rod; the utility model has the advantages that: the filtering device is arranged at the inlet end of the valve body, so that a good filtering effect is ensured, and the later maintenance, cleaning, installation and disassembly are greatly facilitated; by arranging the leakage-preventing device on the valve body at the lower end of the valve core and under the action of the elastic force of the spring, the zero leakage risk after the pressure reducing valve is closed is ensured.

Description

Pressure reducing valve

Technical Field

The utility model belongs to the technical field of the valve body, especially, relate to a relief pressure valve.

Background

The pressure reducing valve is a valve which reduces the inlet pressure to a certain required outlet pressure through regulation and leads the outlet pressure to be automatically kept stable by relying on the energy of the medium. From the viewpoint of hydrodynamics, the pressure reducing valve is a throttling element with variable local resistance, namely, the flow speed and the kinetic energy of fluid are changed by changing the throttling area to cause different pressure losses, thereby achieving the purpose of pressure reduction. Then, the fluctuation of the pressure behind the valve is balanced with the spring force by means of the regulation of the control and regulation system, so that the pressure behind the valve is kept constant within a certain error range.

However, the medium flowing through the existing pressure reducing valve contains certain impurities, and a filtering device is usually installed in the pressure reducing valve, but the existing filtering devices are all arranged between a valve body and a valve rod, so that the installation and the disassembly are troublesome, and particularly, when the filtering device needs to replace or wash a filter screen, the disassembly process is quite troublesome; brings certain inconvenience to the use and the maintenance.

Also after the pressure relief valve has been closed, normally the medium will leak from the low pressure side at the high pressure side, and the sealing cannot be fully guaranteed, so that the pressure relief valve cannot guarantee a zero risk of leakage.

Disclosure of Invention

An object of the utility model is to overcome the not enough of prior art existence, and provide a simple structure, and maintain convenient, the good relief pressure valve of sealing performance.

The purpose of the utility model is achieved by the following technical scheme, the pressure reducing valve comprises a valve body, a valve rod and a valve cover, wherein the valve rod is positioned in a valve core of the valve body and can move up and down; and a leakage-proof device is arranged in the valve body and is positioned at the lower end of the valve core, and the leakage-proof device is connected with the lower end of the valve rod.

Preferably, a first mounting groove for mounting the filtering device is formed in the radial surface of the inlet end of the valve body, a first opening of the first mounting groove faces downwards, and an internal thread is formed in the opening wall of the first opening.

Preferably, the filtering device comprises a filtering net and a first plug, the filtering net is installed in the first installation groove and is compressed through the first plug, and the first plug is fixed on the first opening in a threaded connection mode.

Preferably, a first sealing ring is arranged between the first plug and the first opening, and the first sealing ring is embedded in a groove formed in the radial surface of the first plug.

Preferably, a second mounting groove for mounting the leakage-preventing device is formed in the radial surface of the valve body at the lower end of the valve core, a second opening of the second mounting groove faces downwards, and an internal thread is formed in the wall of the second opening.

Preferably, the leakage-proof device comprises a valve flap, a valve flap seat, a spring and a second plug, the valve flap is positioned at the upper end of the valve flap seat, the valve flap seat is fixed at the lower end of the valve rod in a threaded connection mode, and the valve flap is limited between the valve flap seat and a limiting block arranged on the valve rod; the second plug is fixed on the second opening in a threaded connection mode, and a spring is installed between the second plug and the lower end of the valve flap seat.

Preferably, a second sealing ring is arranged between the second plug and the second opening, and the second sealing ring is embedded in a groove formed in the radial surface of the second plug.

Preferably, a sinking groove for preventing the spring from deviating is arranged at the center of the second choke plug.

The utility model has the advantages that: the filtering device is arranged at the inlet end of the valve body, so that a good filtering effect is ensured, and the later maintenance, cleaning, installation and disassembly are greatly facilitated; by arranging the leakage-preventing device on the valve body at the lower end of the valve core and under the action of the elastic force of the spring, the zero leakage risk after the pressure reducing valve is closed is ensured.

Drawings

Fig. 1 is a schematic view of the front view cross-sectional structure of the present invention.

The reference numbers in the drawings are respectively: 1. a valve body; 2. a valve stem; 3. a valve cover; 4. a filtration device; 5. a leakage prevention device; 11. a valve core; 12. a first mounting groove; 13. a second mounting groove; 41. a filter screen; 42. a first plug; 43. a first seal ring; 51. a valve flap; 52. a valve flap seat; 53. a spring; 54. a second plug; 55. a second seal ring; 12-1, a first opening; 13-1, a second opening; 54-1 and a sink.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings: as shown in the attached figure 1, the utility model comprises a valve body 1, a valve rod 2 and a valve cover 3, wherein the valve rod 2 is positioned in a valve core 11 of the valve body 1 and moves up and down, the valve cover 3 is arranged at the upper end of the valve body 1, a filtering device 4 is arranged at the inlet end of the valve body 1, and the filtering device 4 is positioned on the radial surface of the valve body 1; a leakage-proof device 5 is arranged in the valve body 1, the leakage-proof device 5 is positioned at the lower end of the valve core 11, and the leakage-proof device 5 is connected with the lower end of the valve rod 2; the filtering device is arranged at the inlet end of the valve body, so that a good filtering effect is ensured, and the later maintenance, cleaning, installation and disassembly are greatly facilitated; by arranging the leakage-preventing device on the valve body at the lower end of the valve core and under the action of the elastic force of the spring, the zero leakage risk after the pressure reducing valve is closed is ensured.

In order to facilitate the installation of the filtering device 4 on the valve body 1, a first installation groove 12 for installing the filtering device 4 is arranged on the radial surface of the inlet end of the valve body 1, a first opening 12-1 of the first installation groove 12 faces downwards, and an internal thread is arranged on the opening wall of the first opening 12-1.

The filtering device 4 comprises a filtering net 41 and a first plug 42, the filtering net 41 is installed in the first installation groove 12 and is pressed tightly through the first plug 42, and the first plug 42 is fixed on the first opening 12-1 in a threaded connection mode.

In order to improve the sealing performance between the first plug 42 and the first opening 12-1 after being screwed, a first sealing ring 43 is arranged between the first plug 42 and the first opening 12-1, and the first sealing ring 43 is embedded in a groove formed in the radial surface of the first plug 42.

In order to facilitate the installation of the leakage preventing device 5 on the valve body 1, a second installation groove 13 for installing the leakage preventing device 5 is arranged on the radial surface of the valve body 1 at the lower end of the valve core 11, a second opening 13-1 of the second installation groove 13 faces downwards, and an opening wall of the second opening 13-1 is provided with internal threads.

The leakage-proof device 5 comprises a valve clack 51, a valve clack seat 52, a spring 53 and a second plug 54, wherein the valve clack 51 is positioned at the upper end of the valve clack seat 52, the valve clack seat 52 is fixed at the lower end of the valve rod 2 in a threaded connection mode, and the valve clack 51 is limited between the valve clack seat 52 and a limiting block 21 arranged on the valve rod 2; the second plug 54 is fixed on the second opening 13-1 in a threaded connection mode, and a spring 53 is arranged between the second plug 54 and the lower end of the valve clack seat 52; when the pressure reducing valve is closed, at this time, the valve flap 51 abuts the opening of the valve spool 11, and the valve flap 51 is further urged to abut the opening of the valve spool 11 by the elastic force of the spring 53, so that zero risk of leakage after the pressure reducing valve is closed is achieved.

In order to improve the sealing performance between the second plug 54 and the second opening 13-1 after being screwed, a second sealing ring 55 is arranged between the second plug 54 and the second opening 13-1, and the second sealing ring 55 is embedded in a groove formed in the radial surface of the second plug 54.

The second stopper 54 is provided at the center thereof with a subsidence groove 54-1 for preventing the spring 53 from being deviated during the movement.

The present invention is not limited to the above embodiments, and any change is made on the shape or material composition, and all the structural designs provided by the present invention are all the deformation of the present invention, which should be considered within the protection scope of the present invention.

Claims

1. The utility model provides a pressure reducing valve, includes valve body (1), valve rod (2), valve gap (3), valve rod (2) are located case (11) of valve body (1) and are activity from top to bottom, valve gap (3), its characterized in that are installed to the upper end of valve body (1): a filtering device (4) is arranged at the inlet end of the valve body (1), and the filtering device (4) is positioned on the radial surface of the valve body (1); the anti-leakage valve is characterized in that an anti-leakage device (5) is arranged in the valve body (1), the anti-leakage device (5) is located at the lower end of the valve core (11), and the anti-leakage device (5) is connected with the lower end of the valve rod (2).

2. The pressure reducing valve according to claim 1, wherein: the radial surface of the inlet end of the valve body (1) is provided with a first mounting groove (12) for mounting the filtering device (4), a first opening (12-1) of the first mounting groove (12) faces downwards, and an internal thread is arranged on the opening wall of the first opening (12-1).

3. The pressure reducing valve according to claim 2, wherein: the filtering device (4) comprises a filtering net (41) and a first plug (42), the filtering net (41) is installed in the first installation groove (12) and is pressed tightly through the first plug (42), and the first plug (42) is fixed on the first opening (12-1) in a threaded connection mode.

4. The pressure reducing valve according to claim 3, wherein: a first sealing ring (43) is arranged between the first plug (42) and the first opening (12-1), and the first sealing ring (43) is embedded in a groove formed in the radial surface of the first plug (42).

5. The pressure reducing valve according to claim 1, wherein: a second mounting groove (13) for mounting the leakage-preventing device (5) is formed in the radial surface of the valve body (1) at the lower end of the valve core (11), a second opening (13-1) of the second mounting groove (13) faces downwards, and internal threads are formed in the opening wall of the second opening (13-1).

6. The pressure reducing valve according to claim 5, wherein: the leakage-proof device (5) comprises a valve clack (51), a valve clack seat (52), a spring (53) and a second plug (54), wherein the valve clack (51) is positioned at the upper end of the valve clack seat (52), the valve clack seat (52) is fixed at the lower end of the valve rod (2) in a threaded connection mode, and the valve clack (51) is limited between the valve clack seat (52) and a limiting block (21) arranged on the valve rod (2); the second plug (54) is fixed on the second opening (13-1) in a threaded connection mode, and a spring (53) is installed between the second plug (54) and the lower end of the valve flap seat (52).

7. The pressure reducing valve of claim 6, wherein: a second sealing ring (55) is arranged between the second plug (54) and the second opening (13-1), and the second sealing ring (55) is embedded in a groove formed in the radial surface of the second plug (54).

8. The pressure reducing valve of claim 6, wherein: a sinking groove (54-1) for preventing the spring (53) from deviating is arranged at the center of the second plug (54).