Pneumatic diaphragm single-seat regulating valve

Abstract

The utility model discloses a pneumatic diaphragm single-seat regulating valve which is characterized by further comprising a guide sleeve installed between a valve body and a valve cover and a pressing piece installed on the guide sleeve and used for pressing a valve seat, and a medium circulation hole is formed in the pressing piece. The guide sleeve is provided with an adjusting channel used for balancing pressure and adjusting the stability of the valve rod and the valve element. The guide sleeve and the pressing piece are arranged and used for pressing and installing the valve seat in the valve body, so that the valve seat and the valve body do not need to be fixedly connected in a welding mode and the like, and the valve seat can be replaced after being abraded.

Description

Technical Field

[0001] The utility model relates to a regulating valve, in particular to a pneumatic film single-seat regulating valve. Background Art

[0002] The pneumatic diaphragm single-seat regulating valve is a regulating valve that uses a pneumatic actuator as a valve drive. The existing regulating valve will cause a certain vibration of the valve stem and valve core due to the imbalance of the pressure medium during the opening or closing process of the pneumatic actuator. The vibration will affect the accuracy of the valve stem and valve core, and will also increase wear and tear, affecting the service life;

[0003] Secondly, the valve core in the existing regulating valve is basically integrated with the valve stem or directly installed on the valve stem by welding, which means that the entire valve core and valve stem need to be replaced after the valve core is worn, which is costly;

[0004] Meanwhile, in the prior art, the valve seat is either directly mounted on the valve body by welding or fixed on the valve body by means of screws, etc. Welding fixation cannot be replaced, and fixing by means of screws is cumbersome, and the screws may become loose due to the scouring of the medium and the friction between the valve cores during use. Once loosened, the position of the valve seat cannot be guaranteed and leakage may occur. Therefore, a pneumatic diaphragm single-seat regulating valve is proposed. Utility Model Content

[0005] The utility model aims to solve the above problems and proposes a pneumatic film single-seat regulating valve.

[0006] In order to achieve the above-mentioned purpose, the utility model provides the following technical solution: a pneumatic diaphragm single-seat regulating valve, comprising a valve body, a valve cover installed on the valve body, a bracket installed on the valve cover, a pneumatic actuator installed on the bracket, a valve stem connected to the pneumatic actuator, a valve core installed at one end of the valve stem, and a valve seat installed in the valve body; it is characterized in that it also includes a guide sleeve installed between the valve body and the valve cover and a clamping piece installed on the guide sleeve for clamping the valve seat, the clamping piece is provided with a medium flow hole, and the guide sleeve is provided with an adjustment channel for balancing the pressure and adjusting the stability of the valve stem and the valve core.

[0007] Further preferably, a valve cavity is provided in the valve body, a balancing cavity is provided between the valve stem and the valve cover, and the regulating channel communicates with the valve cavity and the balancing cavity.

[0008] Further preferably, the valve core comprises an opening and closing member mounted on the valve stem and cooperating with the valve seat to form a seal, and a locking member mounted on the valve stem for locking the opening and closing member on the valve stem.

[0009] Further preferably, it also includes a packing installed between the valve stem and the valve cover, and a packing pressure plate installed on the valve cover for pressing the packing between the valve stem and the valve cover.

[0010] Further preferably, it also includes an opening arranged in a conical shape on the valve seat.

[0011] The beneficial effects of the utility model are as follows: the guide sleeve and the pressing piece are arranged to press the valve seat into the valve body, so that the valve seat and the valve body do not need to be fixedly connected by welding or the like, and the valve seat can be replaced after being worn;

[0012] By adjusting the setting of the channel, it is used to connect the valve cavity and the balance cavity, so that the pressure in the valve cavity is balanced with the pressure in the balance cavity, which stabilizes the movement of the valve stem and the valve core, and avoids the valve core and the valve stem from vibrating due to changes in medium pressure when opening or closing, which affects the wear, sealing and service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Attached Figure 1 It is a structural schematic diagram of the utility model;

[0014] Attached Figure 2 It is a partial structural schematic diagram of the utility model;

[0015] Attached Figure 3 It is a partial structural schematic diagram of the utility model.

[0016] Legend: 1. Valve body; 2. Valve cover; 3. Bracket; 4. Pneumatic actuator; 5. Valve stem; 6. Valve seat; 7. Valve core; 8. Guide sleeve; 9. Pressing part; 10. Adjusting channel; 11. Valve cavity; 12. Balance cavity; 13. Opening and closing part; 14. Locking part; 15. Packing; 16. Packing pressure plate; 17. Opening; 18. Medium flow hole. DETAILED DESCRIPTION

[0017] Next, we further explain the pneumatic diaphragm single-seat regulating valve of the utility model in conjunction with the accompanying drawings.

[0018] It should be noted that all directional indications such as up, down, left, right, front, back... in the embodiments of the utility model 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.

[0019] In the present invention, unless otherwise clearly defined and limited, the terms "connection", "fixation", etc. should be understood in a broad sense; for example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it 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.

[0020] See also Figure 1-3 As shown in, a pneumatic diaphragm single-seat regulating valve comprises a valve body 1, a valve cover 2 mounted on the valve body 1, a bracket 3 mounted on the valve cover 2, a pneumatic actuator 4 mounted on the bracket 3, a valve stem 5 connected to the pneumatic actuator 4, a valve core 7 mounted at one end of the valve stem 5, and a valve seat 6 mounted in the valve body 1; it is characterized in that it also comprises a guide sleeve 8 mounted between the valve body 1 and the valve cover 2 and a pressing member 9 threadedly mounted on the guide sleeve 8 for pressing the valve seat 6, the pressing member 9 is provided with a medium flow hole 18, and the guide sleeve 8 is provided with an adjusting channel 10 for balancing the pressure and adjusting the stability of the valve stem 5 and the valve core 7;

[0021] The guide sleeve 8 and the pressing piece 9 are provided to press the valve seat 6 into the valve body 1, so that the valve seat 6 and the valve body 1 do not need to be fixedly connected by welding or the like, and the valve seat 6 can be replaced after being worn, thereby saving costs.

[0022] In one embodiment, a valve cavity 11 is provided in the valve body 1, a balancing cavity 12 is provided between the valve stem 5 and the valve cover 2, and the regulating channel 10 communicates with the valve cavity 11 and the balancing cavity 12;

[0023] By adjusting the setting of the channel 10, the valve chamber 11 and the balance chamber 12 are connected, so that the pressure in the valve chamber 11 is balanced with the pressure in the balance chamber 12, which stabilizes the movement of the valve stem 5 and the valve core 7, and avoids the valve core 7 and the valve stem 5 from vibrating due to changes in medium pressure when opening or closing, thereby affecting wear, sealing and service life.

[0024] In one embodiment, the valve core 7 includes an opening and closing member 13 mounted on the valve stem 5 and cooperating with the valve seat 6 to form a seal, and a locking member 14 mounted on the valve stem 5 and used to lock the opening and closing member 13 on the valve stem 5;

[0025] The valve core 7 is composed of an opening and closing member 13 and a locking member 14. The opening and closing member 13 is used to contact with the valve seat 6 to form a seal. The locking member 14 is used to press the opening and closing member 13 onto the valve stem 5. The locking member 14 can be installed on the valve stem 5 through threads. The opening and closing member 13 can be installed on the valve stem 5 in a sleeve manner or through threads. When the opening and closing member 13 is worn out due to long-term use, the opening and closing member 13 can be replaced separately without replacing the entire valve stem 5 and the valve core 7, thereby saving costs.

[0026] In one embodiment, it further includes a packing 15 installed between the valve stem 5 and the valve cover 2 and a packing pressing plate 16 installed on the valve cover 2 for pressing the packing 15 between the valve stem 5 and the valve cover 2;

[0027] The packing 15 is provided to increase the sealing performance between the valve stem 5 and the valve cover 2. The packing pressure plate 16 is used to press the packing 15 between the valve stem 5 and the valve cover 2. The packing pressure plate 16 is fixed to the valve cover 2 by bolts.

[0028] In one embodiment, the valve seat 6 further includes a conical opening 17 .

[0029] The protection scope of the present utility model is not limited to the above embodiments and their variations. Conventional modifications and replacements made by those skilled in the art based on the contents of this embodiment all fall within the protection scope of the present utility model.

Claims

1. A pneumatic diaphragm single-seat regulating valve, comprising a valve body (1), a valve cover (2) mounted on the valve body (1), a bracket (3) mounted on the valve cover (2), a pneumatic actuator (4) mounted on the bracket (3), a valve stem (5) connected to the pneumatic actuator (4), a valve core (7) mounted at one end of the valve stem (5), and a valve seat (6) mounted in the valve body (1); wherein: The valve body (1) and the valve cover (2) also include a guide sleeve (8) installed between the valve body (1) and the valve cover (2), and a pressing member (9) installed on the guide sleeve (8) for pressing the valve seat (6), wherein the pressing member (9) is provided with a medium flow hole (18), and the guide sleeve (8) is provided with an adjustment channel (10) for balancing the pressure and adjusting the stability of the valve stem (5) and the valve core (7).

2. A pneumatic diaphragm single-seat regulating valve according to claim 1, characterized in that: A valve cavity (11) is provided in the valve body (1), a balancing cavity (12) is provided between the valve stem (5) and the valve cover (2), and the regulating channel (10) communicates with the valve cavity (11) and the balancing cavity (12).

3. The pneumatic diaphragm single-seat regulating valve according to claim 1, characterized in that: The valve core (7) comprises an opening and closing member (13) mounted on the valve stem (5) and cooperating with the valve seat (6) to form a seal, and a locking member (14) mounted on the valve stem (5) and used to lock the opening and closing member (13) on the valve stem (5).

4. The pneumatic diaphragm single-seat regulating valve according to claim 1, characterized in that: It also includes a packing (15) installed between the valve stem (5) and the valve cover (2), and a packing pressing plate (16) installed on the valve cover (2) for pressing the packing (15) between the valve stem (5) and the valve cover (2).

5. The pneumatic diaphragm single-seat regulating valve according to claim 1, characterized in that: It also includes an opening (17) arranged in a conical shape on the valve seat (6).

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