Pneumatic diaphragm valve

Abstract

The pneumatic diaphragm valve comprises a valve body and a valve cover, a liquid inlet and a liquid outlet are formed in the valve body, the liquid inlet penetrates through the top of the valve body, the liquid outlet penetrates through the top of the valve body, a boss is arranged between the liquid inlet and the liquid outlet, the valve cover is arranged on the top of the valve body, and the valve cover is arranged on the valve body. The valve rod is adjusted to slide up and down through the pneumatic actuator, firmness of connection of the diaphragm, the valve clack and the valve rod is improved through the extending portion, connection is more stable and reliable, when the diaphragm is pressed on the boss of the valve body, the liquid inlet and the liquid outlet are sealed respectively, and the valve is in a closed state, so that the valve is not prone to falling off. When the valve is opened, liquid is only in contact with the diaphragm and the liquid inlet and the liquid outlet of the valve body, the anti-leakage effect is good, the anti-corrosion effect is good, the valve is suitable for various media, the application range is wide, and adjustment is convenient and fast.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a pneumatic diaphragm valve. Background Technology

[0002] A diaphragm valve is a special type of valve that can open or close a fluid passage or regulate the liquid flow rate in the open state by moving or deforming a diaphragm. Because it separates the fluid passage from the non-fluid area through a diaphragm, it has a high degree of cleanliness and is widely used in pipelines for transmitting high-purity media such as ultrapure water.

[0003] However, when the diaphragm of the existing diaphragm valve is fitted to the valve body boss to seal the channel, the diaphragm is relatively thin, and the fit between the diaphragm and the valve body boss is not tight enough after the diaphragm is pressed, which can easily lead to leakage. The connection between the diaphragm and the valve disc is also not stable enough. Frequent pulling up of the diaphragm can easily cause the connection to break, affecting the service life of the valve. Ordinary diaphragm valves require manual adjustment, which is inconvenient.

[0004] Therefore, it is necessary to provide a pneumatic diaphragm valve to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this invention is to provide a pneumatic diaphragm valve to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a pneumatic diaphragm valve, comprising a valve body and a valve cover, wherein the valve body has an inlet and an outlet, the inlet penetrating through the top of the valve body, the outlet penetrating through the top of the valve body, a boss being provided between the inlet and the outlet, the valve cover being disposed on the top of the valve body, a diaphragm being provided between the valve cover and the valve body, the diaphragm sealing the top of the inlet and the outlet, a sliding groove being provided at the bottom of the valve cover, a valve disc being slidably disposed within the sliding groove, the top of the diaphragm being engaged with the bottom of the valve disc, an extension being provided at the top of the diaphragm, a locking hole being provided at the top of the valve disc, a valve stem being disposed within the locking hole, a connecting screw being provided at the bottom of the valve stem, the bottom of the connecting screw penetrating through the valve disc and extending into the extension of the diaphragm, a valve stem nut being provided above the valve cover, and a pneumatic actuator being provided above the valve cover.

[0007] As a preferred embodiment of this utility model, the valve body is provided with a plurality of studs at the top, the top of the studs extending through the valve cover and above it, and the top of the studs is threaded with a nut.

[0008] As a preferred embodiment of this utility model, a slot is provided at the bottom of the valve disc, and the extension is engaged in the slot.

[0009] As a preferred embodiment of this utility model, a connecting pin is provided on the side wall of the valve disc, and the connecting pin passes through the side wall of the valve disc and through the valve stem.

[0010] As a preferred embodiment of this utility model, the top of the valve stem extends upward through the valve stem nut.

[0011] In a preferred embodiment of this invention, the output end of the pneumatic actuator is connected to the top of the valve stem via a transmission connection.

[0012] As a preferred embodiment of this utility model, the top of the valve stem nut extends through the valve cover and upwards.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This utility model discloses a pneumatic diaphragm valve. The valve stem is adjusted up and down by a pneumatic actuator. The valve stem drives the valve disc to move up and down. When the diaphragm is lifted, it disengages from the boss on the valve body, connecting the inlet and outlet. The valve opens, forming a channel for liquid to pass through. The extension section enhances the strength of the connection between the diaphragm, valve disc, and valve stem, making the connection more stable and reliable. When the diaphragm is pressed against the boss on the valve body, the inlet and outlet are sealed, the channel is not connected, and the valve is in the closed state. The extension section of the diaphragm firmly presses it against the boss, making the fit tighter and the sealing performance better. When the valve is open, the liquid only contacts the diaphragm and the inlet and outlet of the valve body, resulting in good leakage prevention, good corrosion resistance, applicability to various media, wide applicability, and convenient and quick adjustment. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] In the diagram: 1. Valve body; 101. Inlet; 102. Outlet; 2. Diaphragm; 21. Extension; 3. Connecting screw; 4. Valve disc; 5. Nut; 6. Connecting pin; 7. Valve stem; 8. Valve cover; 9. Valve stem nut; 10. Pneumatic actuator. Detailed Implementation

[0018] The embodiments of this utility model will now be described with reference to the accompanying drawings. In this process, to ensure clarity and convenience, we may exaggerate the width of lines or the size of constituent elements in the drawings.

[0019] Furthermore, the terms used below are defined based on the functions of this utility model and may vary depending on the user's or operator's intent or convention. Therefore, these terms are defined based on the entire contents of this specification.

[0020] like Figure 1 As shown, a pneumatic diaphragm valve includes a valve body 1 and a valve cover 8. The valve body 1 has an inlet 101 and an outlet 102. The inlet 101 penetrates the top of the valve body 1, and the outlet 102 penetrates the top of the valve body 1. A boss is provided between the inlet 101 and the outlet 102. The valve cover 8 is located on the top of the valve body 1. A diaphragm 2 is provided between the valve cover 8 and the valve body 1. The diaphragm 2 seals the top of the inlet 101 and the outlet 102. A plurality of studs are provided on the top of the valve body 1. The top of the studs penetrates the valve cover 8 and extends above it. Nuts 5 are threadedly connected to the top of the studs. The valve cover 8 and the valve body 1 are locked and fixed by the cooperation of the nuts 5 and the studs, and the edge of the diaphragm 2 is fixed at the same time. The valve is opened and closed by the cooperation of the diaphragm 2 and the boss of the valve body 1.

[0021] The valve cover 8 has a sliding groove at its bottom, within which a valve disc 4 is slidably disposed. The valve disc 4 has a retaining groove at its bottom. The diaphragm 2 has an extension 21 at its top, which engages with the retaining groove of the valve disc 4. The valve disc 4 has a retaining hole at its top, within which a valve stem 7 is disposed. A connecting pin 6 is provided on the side wall of the valve disc 4, penetrating the side wall and passing through the valve stem 7, thereby connecting and fixing the valve stem 7 to the valve disc 4. A connecting screw 3 is provided at the bottom of the valve stem 7, penetrating the valve disc 4 and extending into the extension 21 of the diaphragm 2, thereby connecting the valve stem 7 and the valve disc 4. Connected to the diaphragm 2, the valve stem 7 slides up and down, causing the valve disc 4 to slide up and down, thereby lifting and pressing the diaphragm 2. When the diaphragm 2 is lifted, it disengages from the boss of the valve body 1, and the inlet 101 and outlet 102 are connected, opening the valve to form a connecting channel for liquid to pass through. When the diaphragm 2 is pressed against the boss of the valve body 1, the inlet 101 and outlet 102 are closed respectively, the channel is not connected, and the valve is in the closed state. When the valve is opened, the liquid only contacts the diaphragm 2 and the inlet 101 and outlet 102 of the valve body 1, providing good leakage prevention and corrosion resistance, and is suitable for various media.

[0022] A valve stem nut 9 is provided on the upper end of the valve cover 8. The top of the valve stem nut 9 extends through the valve cover 8 and upwards. The top of the valve stem 7 extends through the valve stem nut 9 and upwards. A pneumatic actuator 10 is provided on the upper part of the valve cover 8. The output end of the pneumatic actuator 10 is connected to the top of the valve stem 7. The pneumatic actuator 10 drives the valve stem 7 to slide up and down, thereby realizing the engagement and disengagement of the diaphragm 2 and the boss of the valve body 1, and finally realizing the opening and closing of the valve. The adjustment is convenient and fast.

[0023] Specifically, the implementation method involves adjusting the up-and-down sliding of the valve stem 7 via a pneumatic actuator 10. The valve stem 7 drives the valve disc 4 to move up and down. When the diaphragm 2 is lifted, the diaphragm 2 disengages from the boss of the valve body 1, at which point the inlet 101 and outlet 102 are connected, and the valve opens to form a connecting channel for liquid to pass through. The extension 21 enhances the firmness of the connection between the diaphragm 2, the valve disc 4, and the valve stem 7, making the connection more stable and reliable. When the diaphragm 2 is pressed tightly against the boss of the valve body 1, the inlet 101 and outlet 102 are sealed respectively, the channel is not connected, and the valve is in the closed state. The extension 21 of the diaphragm 2 firmly presses it against the boss, making the two fit more tightly and the sealing performance better. When the valve is open, the liquid only contacts the diaphragm 2 and the inlet 101 and outlet 102 of the valve body 1, resulting in good leakage prevention, good corrosion resistance, applicability to various media, wide applicability range, and convenient and quick adjustment.

[0024] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A pneumatic diaphragm valve comprising a valve body (1) and a bonnet (8), characterized in that: The valve body (1) is provided with an inlet (101) and an outlet (102), the inlet (101) penetrates the top of the valve body (1), the outlet (102) penetrates the top of the valve body (1), a boss is arranged between the inlet (101) and the outlet (102), the valve cover (8) is arranged on the top of the valve body (1), a diaphragm (2) is arranged between the valve cover (8) and the valve body (1), the diaphragm (2) seals the top of the inlet (101) and the outlet (102), a sliding groove is arranged on the bottom of the valve cover (8), a valve flap (4) is slidably arranged in the sliding groove, the top of the diaphragm (2) is clamped on the bottom of the valve flap (4), the top of the diaphragm (2) is provided with an extension (21), a clamping hole is arranged on the top of the valve flap (4), a valve rod (7) is arranged in the clamping hole, a connecting screw rod (3) is arranged on the bottom of the valve rod (7), the connecting screw rod (3) penetrates the valve flap (4) and extends into the extension (21) of the diaphragm (2), a valve rod nut (9) is arranged above the valve cover (8), and a pneumatic actuator (10) is arranged above the valve cover (8).

2. A diaphragm valve according to claim 1, characterized in that: A plurality of studs are arranged on the top of the valve body (1), the studs extend to above the valve cover (8) and are threadedly connected with nuts (5).

3. A diaphragm valve according to claim 1, characterized in that: The bottom of the valve flap (4) is provided with a clamping groove, and the extension (21) is clamped in the clamping groove.

4. A diaphragm valve according to claim 1, characterized in that: A connecting pin (6) is arranged on the side wall of the valve flap (4), the connecting pin (6) penetrates the side wall of the valve flap (4) and passes through the valve rod (7).

5. A diaphragm valve according to claim 1, characterized in that: The top of the valve rod (7) extends to above through the valve rod nut (9).

6. A diaphragm valve according to claim 1, characterized in that: The output end of the pneumatic actuator (10) is in transmission connection with the top of the valve rod (7).

7. A diaphragm valve according to claim 1, characterized in that: The top of the valve rod nut (9) extends to above through the valve cover (8).

Images