Self-operated differential pressure regulating valve

Abstract

The utility model discloses a self-operated differential pressure regulating valve, which comprises a valve body and is characterized by further comprising a self-operated actuating mechanism mounted on the valve body and a manual regulating mechanism mounted on the valve body, the self-operated executing mechanism comprises a shell installed on the valve body, a diaphragm installed in the shell, a tray installed on the diaphragm, a piston rod installed on the tray, a limiting table arranged on the piston rod and used for limiting the stroke of the diaphragm, and a connector arranged on the shell and used for preventing medium impact. A flow slowing plate is arranged in the connector. Through the arrangement of the connector, after media in the front valve pipe and the rear valve pipe enter the shell and are buffered by the flow slowing plate in the connector, the problem that the media directly impact the diaphragm to cause damage to the diaphragm is avoided, the service life of the diaphragm is prolonged, and therefore the service life of the executing mechanism is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a self-operated differential pressure regulating valve. Background Art

[0002] The self-operated regulating valve, also known as the self-operated control valve, is a regulating valve that relies on the pressure and temperature of the medium flowing through the valve as energy to drive the valve to work automatically. It does not require an external power supply or secondary instrument. The existing self-operated actuator pressure tap is directly connected to the shell, so that the medium impacts the surface of the diaphragm, which is easy to break the diaphragm after long-term use, shortening the service life of the diaphragm, thereby easily affecting the accuracy of the regulating valve; therefore, it is necessary to propose a self-operated differential pressure regulating valve. Utility Model Content

[0003] The purpose of the utility model is to solve the above problems and to provide a self-operated differential pressure regulating valve.

[0004] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme: it includes a valve body, which is characterized in that it also includes a self-powered actuator installed on the valve body and a manual adjustment mechanism installed on the valve body, the self-powered actuator includes a shell installed on the valve body, a diaphragm installed in the shell, a tray installed on the diaphragm, a piston rod installed on the tray, and a limit platform arranged on the piston rod to limit the diaphragm stroke, and a joint arranged on the shell to prevent medium impact, and a slow flow plate is arranged in the joint; the manual adjustment mechanism includes a lower valve cover installed on the valve body, a pressure ring installed on the valve body to form a seal with the lower valve cover, a lower valve stem installed on the valve body and passing through the lower valve cover and the pressure ring, upper and lower valve cores installed on the lower valve stem, and an auxiliary spring installed on the valve body and connected to the lower valve core.

[0005] Preferably, a guide cylinder for vertical movement of the lower valve core is installed on the valve body, an interface is provided at one end of the lower valve stem, and a protective cover is installed on the lower valve cover.

[0006] Preferably, the diaphragm divides the shell into an upper diaphragm cavity and a lower diaphragm cavity, the upper diaphragm cavity is connected to a valve front tube connected to the front end of the valve body, and the lower diaphragm cavity is connected to a valve rear tube connected to the front end of the valve body.

[0007] Preferably, an upper valve cover is installed on the valve body, a balance spring is installed on the upper valve cover, an upper valve stem connected to the balance spring is installed on the upper valve cover, and one end of the upper valve stem is connected to the piston rod.

[0008] Preferably, an upper valve core is mounted on the upper valve stem, and a valve seat matching the upper valve core is mounted on the valve body.

[0009] The beneficial effects of the utility model are as follows: through the setting of the joint, after the medium in the front and rear valve pipes enters the housing, it is buffered by the slow flow plate in the joint, thereby avoiding the problem of the medium directly impacting the diaphragm and causing damage to the diaphragm, thereby improving the service life of the diaphragm, thereby improving the service life of the actuator;

[0010] By setting the limit table, when the piston rod moves up and down driven by the diaphragm, the movable stroke of the piston rod is limited, so that the deformation of the diaphragm can be controlled and the service life of the diaphragm can be improved;

[0011] Through the setting of the manual adjustment mechanism, as a backup switch, when the actuator fails, the valve body can be closed urgently by external drive equipment or manually, so as to quickly cut off the medium;

[0012] Through the setting of the auxiliary spring, when driving the lower valve stem, the auxiliary spring can help the lower valve core to close quickly, thereby quickly cutting off the flow of the medium;

[0013] By setting the guide cylinder, the lower valve core can move vertically along the guide cylinder when opening or closing, thereby improving the stability of the lower valve core. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 It is an enlarged schematic diagram of the structure at A of the utility model;

[0016] Figure 3 It is an enlarged schematic diagram of the structure at B of the utility model.

[0017] Markings in the figure: 1 valve body, 2 self-operated actuator, 20 shell, 21 diaphragm, 22 tray, 23 piston rod, 24 limit table, 25 upper diaphragm cavity, 26 lower diaphragm cavity, 27 valve front pipe, 28 valve rear pipe, 29 joint, 291 slow flow plate, 30 lower valve cover, 31 pressure ring, 32 lower valve stem, 33 lower valve core, 34 auxiliary spring, 35 guide cylinder, 36 interface, 37 protective cover, 40 upper valve cover, 41 balance spring, 42 upper valve stem, 43 upper valve core, 44 valve seat. DETAILED DESCRIPTION

[0018] Below we further illustrate the self-operated differential pressure regulating valve of the utility model through embodiments and in conjunction with the accompanying drawings.

[0019] It should be noted that all directional indications such as up, down, left, right, front, back, etc. in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0020] In the present invention, unless otherwise expressly specified or limited, the terms "connect", "fixed" and the like shall be interpreted in a broad sense.

[0021] For example, "fixed" can be fixed connection, detachable connection, or integrated; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] See also Figures 1 to 3As shown, the utility model proposes a self-operated differential pressure regulating valve, including a valve body 1, which is characterized in that it also includes a self-operated actuator 2 installed on the valve body 1 and a manual adjustment mechanism installed on the valve body 1, the self-operated actuator 2 includes a shell 20 installed on the valve body 1, a diaphragm 21 movably installed in the shell 20, a tray 22 installed on the diaphragm 21, a piston rod 23 installed on the tray 22, and a limit table 24 arranged on the piston rod 23 to limit the travel of the diaphragm 21, and a joint 29 for preventing medium impact arranged on the shell 20, and a slow flow plate 291 is arranged in the joint 29; the manual adjustment mechanism includes a lower valve cover 30 installed on the valve body 1 by bolts, and a valve cover 30 installed on the valve body 1 and shaped with the lower valve cover 30 The sealing pressure ring 31, the lower valve stem 32 movably mounted on the valve body 1 and passing through the lower valve cover 30 and the pressure ring 31, the upper and lower valve cores 33 mounted on the lower valve stem 32 by bolts, and the auxiliary spring 34 mounted on the valve body 1 and elastically connected to the lower valve core 33, the valve body 1 is equipped with a guide cylinder 35 that cooperates with the lower valve core 32 to move vertically, one end of the lower valve stem 32 is provided with an interface 36, the interface 36 can be connected to an external wheel or other electric tools to drive the lower valve stem 32 to drive the lower valve core 33 to open or close, and a protective cover 37 is installed on the lower valve cover 30 by bolts; the diaphragm 21 divides the shell 20 into an upper diaphragm cavity 25 and a lower diaphragm cavity 26, the upper diaphragm cavity 25 is connected to a valve front pipe 27 connected to the front end of the valve body 1, and the lower diaphragm cavity A valve rear pipe 28 connected to the front end of the valve body 1 is connected to 26, the valve front pipe 27 and the valve rear pipe 28 are connected to the joint 29 respectively, an upper valve cover 40 is installed on the valve body 1 by bolts, a balance spring 41 is installed on the upper valve cover 40, an upper valve stem 42 connected to the balance spring 41 is installed on the upper valve cover 40, one end of the upper valve stem 42 is connected to the piston rod 23, an upper valve core 43 is installed on the upper valve stem 42, and a valve seat 44 matched with the upper valve core 43 is installed on the valve body 1; through the setting of the joint 29, after the medium in the front valve pipe 27 or the rear valve pipe 28 enters the housing 20, it is buffered by the slow flow plate 291 in the joint 29, thereby preventing the medium from directly impacting the diaphragm 21 and causing damage to the diaphragm 21. The problem is solved, and the service life of the diaphragm 21 is improved, thereby improving the service life of the actuator; by setting the limit platform 24, when the piston rod 23 moves up and down driven by the diaphragm 21, the movable stroke of the piston rod 23 is limited, so that the deformation of the diaphragm 21 can be controlled, and the service life of the diaphragm 21 is improved; by setting the manual adjustment mechanism, as a backup switch, when the actuator fails, the protective cover 37 can be removed and the external wheel or other electric tools can be connected to the interface 36 to drive the lower valve stem 32 to drive the lower valve core 33 to open or close, thereby quickly cutting off the flow of the medium; by setting the auxiliary spring 34, when driving the lower valve stem 32, the auxiliary spring 34 can help the lower valve core 33 to close quickly, thereby quickly cutting off the flow of the medium;By setting the guide cylinder 35, the lower valve core 33 moves vertically along the guide cylinder 35 when opening or closing, thereby improving the stability of the lower valve core 33; by setting the protective cover 37, the exposed part of the lower valve stem 32 is protected to prevent damage from impact, thereby improving the service life of the equipment; by setting the balance spring 41, the balance spring 41 can be adjusted according to different pressures, which has excellent adjustability and adaptability. ;

[0023] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention falls within the protection scope of the present invention.

Claims

1. A self-operated differential pressure regulating valve, comprising a valve body (1), characterized in that The valve body (1) also includes a self-acting actuator (2) mounted on the valve body (1) and a manual adjustment mechanism mounted on the valve body (1), wherein the self-acting actuator (2) includes a housing (20) mounted on the valve body (1), a diaphragm (21) mounted in the housing (20), a tray (22) mounted on the diaphragm (21), a piston rod (23) mounted on the tray (22), and a limit table (24) disposed on the piston rod (23) for limiting the travel of the diaphragm (21), and a stopper (24) disposed on the housing (20) for limiting the travel of the diaphragm (21). 20) on the valve body (1), the joint (29) being provided with a slow flow plate (291); the manual adjustment mechanism comprising a lower valve cover (30) mounted on the valve body (1), a pressure ring (31) mounted on the valve body (1) and forming a seal with the lower valve cover (30), a lower valve stem mounted on the valve body (1) and passing through the lower valve cover (30) and the pressure ring (31), upper and lower valve cores (33) mounted on the lower valve stem, and an auxiliary spring (34) mounted on the valve body (1) and connected to the lower valve core (33).

2. A self-operated differential pressure regulating valve according to claim 1, characterized in that: The valve body (1) is provided with a guide cylinder (35) for vertical movement of the lower valve core, one end of the lower valve stem is provided with an interface (36), and the lower valve cover (30) is provided with a protective cover (37).

3. A self-operated differential pressure regulating valve according to claim 1, characterized in that: The diaphragm (21) divides the housing (20) into an upper diaphragm cavity (25) and a lower diaphragm cavity (26); the upper diaphragm cavity (25) is connected to a valve front tube (27) connected to the front end of the valve body (1); and the lower diaphragm cavity (26) is connected to a valve rear tube (28) connected to the front end of the valve body (1).

4. A self-operated differential pressure regulating valve according to claim 1, characterized in that: An upper valve cover (40) is mounted on the valve body (1), a balance spring (41) is mounted on the upper valve cover (40), an upper valve stem (42) connected to the balance spring (41) is mounted on the upper valve cover (40), and one end of the upper valve stem (42) is connected to the piston rod (23).

5. A self-operated differential pressure regulating valve according to claim 4, characterized in that: An upper valve core (43) is mounted on the upper valve stem (42), and a valve seat (44) matching the upper valve core (43) is mounted on the valve body (1).

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