Micro flow regulating valve

Abstract

The utility model discloses a micro flow regulating valve, which comprises a valve body, a valve seat, a valve cover, a valve rod and a valve core, wherein the valve seat is arranged in the valve body; the valve cover is arranged on the valve body and is used for tightly pressing and installing the valve seat in the valve body; the valve rod is arranged on the valve cover in a sliding manner and one end of the valve rod is positioned in the valve body; the plunger end is arranged on the valve element, the throttling opening is formed in the plunger end in a V shape, the sealing face is arranged on the valve element and matched with the valve seat, and the throttling face is arranged on the plunger end and matched with the valve element. According to the utility model, the plunger end and the V-shaped throttling opening are arranged on the plunger end, so that the accuracy of a flow characteristic curve can be ensured, and the control precision is high; the sealing face and the throttling face are arranged on the valve element in a separated mode, and the separated structure can avoid the situation that the flow characteristic error is increased due to the fact that the sealing face of the valve element and the valve seat is damaged when a medium is subjected to cavitation, flash evaporation or cavitation.

Description

Technical Field

[0001] This utility model relates to a regulating valve, specifically a micro-flow regulating valve. Background Technology

[0002] In applications requiring precise control of minute flow rates, current control valves on the market generally suffer from defects such as large flow curve deviations, low positioning accuracy, and severe flow fluctuations. They can no longer meet the increasingly demanding automatic control requirements for minute flow conditions. Furthermore, the high pressure and velocity of the medium during use cause the valves to be subjected to high-speed scouring by the medium fluid for extended periods, resulting in a shorter service life.

[0003] In existing technologies, cavitation, flashing, or other cavitation phenomena in the medium can damage the sealing surfaces of the valve core and seat, leading to increased flow characteristic errors. Therefore, a micro-flow regulating valve is proposed. Utility Model Content

[0004] The purpose of this invention is to provide a micro-flow regulating valve to solve the above problems.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a micro-flow regulating valve, comprising a valve body, a valve seat installed within the valve body, a valve cover installed on the valve body for pressing the valve seat into the valve body, a valve stem slidably installed on the valve cover with one end inside the valve body, and a valve core disposed on the valve stem; characterized in that it further comprises a plunger end disposed on the valve core, a V-shaped throttling orifice disposed on the plunger end, a sealing surface disposed on the valve core that mates with the valve seat, and a throttling surface disposed on the plunger end that mates with the valve core.

[0006] A further preferred embodiment includes a through hole on the valve seat that is adapted to the plunger end.

[0007] A further preferred embodiment includes an enlarged bore provided on the valve seat, wherein a fluid buffer chamber is formed between the enlarged bore and the valve core.

[0008] A further preferred embodiment includes a flow channel hole disposed on the valve seat that connects the fluid buffer chamber and the valve body cavity.

[0009] Further preferably, it also includes an energy storage sealing ring mounted on the valve seat and located between the valve seat and the valve body, a limiting member for limiting the energy storage sealing ring to be mounted on the valve seat, and a retaining ring for limiting the limiting member and the energy storage sealing ring to be mounted on the valve seat.

[0010] Further preferably, it also includes a spring, packing gasket, packing, pressure pin, and pressure plate installed between the valve stem and the valve seat.

[0011] The beneficial effects of this utility model are: by setting the plunger end and the V-shaped throttling orifice on the plunger end, the flow characteristic curve can be accurately guaranteed and the control precision can be high.

[0012] By separating the sealing surface and the throttling surface on the valve core, the separate structure can prevent the medium from cavitating, flashing, or cavitation, which would damage the valve core and valve seat sealing surfaces and lead to increased flow characteristic errors.

[0013] By setting an enlarged diameter hole on the valve seat, a fluid buffer chamber is formed between the enlarged diameter hole and the valve core, so that the medium fluid is buffered before flowing out from the flow channel hole at the top of the valve seat, so as to further achieve the purpose of slowing down the medium fluid, and avoid the medium fluid directly scouring the inner wall of the valve body. The pressure reduction effect is good, the medium scouring is reduced, and the service life of the valve body is improved. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a partial structural schematic diagram of the present invention;

[0016] Figure 3 This is a schematic diagram of the valve core in this utility model.

[0017] Legend: 1. Valve body; 2. Valve seat; 21. Through hole; 22. Expanded diameter hole; 23. Flow channel hole; 3. Valve cover; 4. Valve stem; 5. Valve core; 51. Plunger end; 52. Throttling orifice; 53. Sealing surface; 54. Throttling surface; 6. Energy storage sealing ring; 61. Limiting element; 62. Retaining ring; 7. Spring; 71. Packing gasket; 72. Packing; 73. Pressure pin; 74. Pressure plate. Detailed Implementation

[0018] The present invention provides a further description of a micro-flow regulating valve in conjunction with the accompanying drawings.

[0019] It should be noted that all directional indicators such as up, down, left, right, front, back, etc. in the embodiments of this utility model are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indicator will also change accordingly.

[0020] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly; for example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can also mean a mechanical connection, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] See Figures 1-3 As shown, a micro-flow regulating valve includes a valve body 1, a valve seat 2 installed inside the valve body 1, a valve cover 3 installed on the valve body 1 for pressing the valve seat 2 into the valve body 1, a valve stem 4 slidably installed on the valve cover 3 with one end inside the valve body 1, and a valve core 5 disposed on the valve stem 4; characterized in that it further includes a plunger end 51 disposed on the valve core 5, a V-shaped throttling orifice 52 disposed on the plunger end 51, a sealing surface 53 disposed on the valve core 5 that cooperates with the valve seat 2, and a throttling surface 54 disposed on the plunger end 51 that cooperates with the valve core 5;

[0022] By setting the plunger end 51 and the V-shaped throttling orifice 52 on the plunger end 51, the flow characteristic curve can be made accurate and the control precision can be high.

[0023] By separating the sealing surface 53 and the throttling surface 54 on the valve core 5, the separate structure can prevent the medium from cavitating, flashing, or cavitation, which would damage the sealing surface 53 of the valve core 5 and valve seat 2 and lead to an increase in flow characteristic error.

[0024] In one embodiment, a through hole 21 adapted to the plunger end 51 is provided on the valve seat 2; the plunger end 51 on the valve core 5 is slidably connected to the through hole 21.

[0025] In one embodiment, the valve seat 2 is further provided with an enlarged diameter hole 22, and a fluid buffer chamber is formed between the enlarged diameter hole 22 and the valve core 5.

[0026] It also includes a flow channel hole 23 provided on the valve seat 2 to connect the fluid buffer chamber and the inner cavity of the valve body 1;

[0027] By setting an enlarged diameter hole 22 on the valve seat 2, a fluid buffer chamber is formed between the enlarged diameter hole 22 and the valve core 5, so that the medium fluid is buffered and then flows out from the flow channel hole 23 on the upper part of the valve seat 2, so as to further achieve the purpose of slowing down the medium fluid, and avoid the medium fluid directly scouring the inner wall of the valve body 1. The pressure reduction effect is good and the medium scouring is reduced, thus improving the service life of the valve body 1.

[0028] In one embodiment, it further includes an energy storage sealing ring 6 installed on the valve seat 2 and located between the valve seat 2 and the valve body 1, a limiting member 61 for limiting the energy storage sealing ring 6 installed on the valve seat 2, and a retaining ring 62 for limiting the limiting member 61 and the energy storage sealing ring 6 installed on the valve seat 2.

[0029] The energy storage sealing ring 6 enhances the sealing between the valve seat 2 and the valve body 1, preventing leakage between the valve seat 2 and the valve body 1 and thus ensuring accurate control of the medium flow rate. The limiting element 61 limits the position of the energy storage sealing ring 6, and the retaining ring 62 limits the installation of the energy storage sealing ring 6 and the limiting element 61 on the valve seat 2.

[0030] In one embodiment, the device further includes a spring 7, a packing pad 71, a packing 72, a pressure pin 73, and a pressure plate 74 installed between the valve stem 4 and the valve seat 2. The pressure plate 74 is fixedly installed on the valve cover 3 by screws, pressing the pressure pin 73 and the packing 72 between the valve stem 4 and the valve cover 3. At the same time, the reaction force of the spring 7, combined with the pressing force of the pressure plate 74, makes the packing 72 elastically pressed between the valve cover 3 and the valve stem 4.

[0031] The scope of protection of this utility model is not limited to the above embodiments and their variations. Conventional modifications and substitutions made by those skilled in the art based on the content of these embodiments are all within the scope of protection of this utility model.

Claims

1. A micro-flow regulating valve, comprising a valve body (1), a valve seat (2) installed within the valve body (1), a valve cover (3) installed on the valve body (1) for pressing the valve seat (2) against the valve body (1), a valve stem (4) slidably mounted on the valve cover (3) with one end inside the valve body (1), and a valve core (5) disposed on the valve stem (4); characterized in that... It also includes a plunger end (51) provided on the valve core (5), a throttling port (52) provided on the plunger end (51) in a V-shape, a sealing surface (53) provided on the valve core (5) that cooperates with the valve seat (2), and a throttling surface (54) provided on the plunger end (51) that cooperates with the valve core (5).

2. The micro flow regulating valve according to claim 1, wherein: It also includes a through hole (21) provided on the valve seat (2) to fit the plunger end (51).

3. The micro flow regulating valve according to claim 1, wherein: It also includes an enlarged diameter hole (22) provided on the valve seat (2), and a fluid buffer chamber is formed between the enlarged diameter hole (22) and the valve core (5).

4. The micro flow regulating valve according to claim 3, wherein: It also includes a flow channel hole (23) provided on the valve seat (2) to connect the fluid buffer chamber and the inner cavity of the valve body (1).

5. The micro flow regulating valve according to claim 1, wherein: It also includes an energy storage seal ring (6) installed on the valve seat (2) and between the valve seat (2) and the valve body (1), a limiting member (61) for limiting the energy storage seal ring (6) on the valve seat (2), and a retaining ring (62) for limiting the limiting member (61) and the energy storage seal ring (6) on the valve seat (2).

6. The micro flow regulating valve according to claim 1, wherein: It also includes a spring (7), a packing pad (71), a packing (72), a pressure pin (73), and a pressure plate (74) installed between the valve stem (4) and the valve seat (2).

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