High-pressure needle type stop valve

Abstract

The utility model relates to a high-pressure needle type stop valve, which is characterized in that a rack is arranged on a valve body through a first screw, cavities are arranged at the central positions of the valve body and the rack, the cavity arranged on the valve body is communicated with the cavity arranged on the rack, a valve rod is arranged in the cavity, a liquid inlet and a liquid outlet are arranged on the valve body, the liquid inlet and the liquid outlet are communicated with the cavities, and the valve rod is arranged in the cavity. A conical valve clack used for communicating and stopping the liquid inlet and the liquid outlet is installed at the end, located in the cavity, of the valve rod, the conical valve clack is installed at the end, located in the cavity, of the valve rod, the valve clack is made of rubber materials, and when the valve clack is located at the lowest point, the valve clack is sealed. The valve clack shields a liquid inlet to block a liquid channel, the sealing face of the valve clack is sealed through a conical line, the sealing effect is good, and the service life is long. The groove used for containing the valve clack is formed in the cavity, the groove and the cavity are in a step shape, and when the valve clack is lifted to the highest point, the tail end of the valve clack is completely contained in the groove.

Description

Technical Field

[0001] The utility model relates to the technical field of stop valves, in particular to a high-pressure needle-type stop valve. Background Art

[0002] High-pressure stop valves can be used in water, steam, compressed air and other pipelines. They have the functions of cutting off, throttling and regulating, among which:

[0003] Cut-off function: The stop valve can cut off or connect the fluid. By rotating the handwheel, the valve stem rises and falls, thereby driving the valve disc to rise and fall to control the opening and closing of the valve, thereby achieving the purpose of cutting off or connecting the fluid.

[0004] Throttling effect: The stop valve seals by twisting the valve stem and applying pressure to the valve disc, which can prevent the medium from entering through the gap, thereby achieving the throttling effect. However, it should be noted that the stop valve cannot be used to adjust pressure and flow for a long time, otherwise its sealing surface may be eroded and corroded by the medium, destroying the sealing performance.

[0005] Regulation: Although the regulation of the stop valve is not as accurate as that of a special regulating valve, it can also play a certain role in regulation in some occasions where the regulation accuracy is not high.

[0006] The stop valves currently on the market have poor sealing effects and short service lives after long-term use. Utility Model Content

[0007] The technical solution adopted by the utility model is to provide a high-pressure needle-type stop valve, including a valve body, a frame is installed on the valve body through a first screw, a cavity is arranged at the center of the valve body and the frame, the cavity arranged on the valve body is communicated with the cavity arranged on the frame, a valve stem is installed in the cavity, a liquid inlet and a liquid outlet are arranged on the valve body, the liquid inlet and the liquid outlet are communicated with the cavity, a valve disc for opening and closing the liquid inlet and the liquid outlet is installed at one end of the valve stem located in the cavity, and the valve disc is in a cone shape.

[0008] Furthermore, the valve disc is mounted on the valve stem via a valve disc cover, and one end of the valve stem located inside the valve disc is mounted inside the valve disc via a split ring.

[0009] Furthermore, a packing cavity is arranged between the valve stem and a cavity arranged on the frame.

[0010] Furthermore, a packing pad for packing blocking is arranged below the packing cavity.

[0011] Furthermore, a packing gland is installed on the packing cavity, and the packing gland is sleeved on the valve stem.

[0012] Furthermore, the packing gland is mounted on the frame by means of a second screw.

[0013] Furthermore, an O-ring is installed between the valve body and the frame.

[0014] The beneficial effects of the utility model are:

[0015] The valve stem of the device is located at one end of the cavity and is equipped with a valve disc for opening and closing the liquid inlet and the liquid outlet. The valve disc is in a cone shape and is made of rubber. When the valve disc is at the lowest point, the valve disc blocks the liquid inlet and blocks the liquid passage. The sealing surface of the valve disc adopts a conical line seal, which has a good sealing effect and a long service life.

[0016] A groove for accommodating the valve disc is arranged on the cavity of the device, and the groove and the cavity are stepped. When the valve disc is lifted to the highest point, the end of the valve disc is completely received in the groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the cross-sectional structure of the whole closed state of a high-pressure needle-type stop valve described in the utility model;

[0018] Figure 2 It is a schematic diagram of the cross-sectional structure of the high-pressure needle-type stop valve of the utility model in an overall open state;

[0019] Figure 3 It is a three-dimensional structural schematic diagram of the connection between the valve stem and the valve disc of a high-pressure needle-type stop valve described in the utility model;

[0020] In the figure: valve body 1; liquid inlet 2; liquid outlet 3; valve disc 4; split ring 5; valve disc cover 6; O-ring 7; first screw 8; frame 9; valve stem 10; packing pad 11; packing cavity 12; packing gland 13; second screw 14. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0022] Example 1

[0023] This embodiment discloses a high-pressure needle-type stop valve, combined with Figure 1-Figure 3As shown, it includes a valve body 1, a frame 9 is installed on the valve body 1 through a first screw 8, a cavity is set at the center of the valve body 1 and the frame 9, the cavity set on the valve body 1 is connected with the cavity set on the frame 9, a valve stem 10 is installed in the cavity, the valve stem 10 can slide in the cavity, the valve body 1, the frame 9 and the valve stem 10 constitute a stop valve body, the valve body 1 is provided with a liquid inlet 2 and a liquid outlet 3, the liquid inlet 2 and the liquid outlet 3 are arranged in parallel, and the liquid inlet 2 and the liquid outlet 3 are arranged in parallel. 3 is inclined, the liquid inlet 2 is lower than the liquid outlet 3, the liquid inlet 2 and the liquid outlet 3 are oppositely arranged on both sides of the cavity, the liquid inlet 2 and the liquid outlet 3 are connected with the cavity, and a valve flap 4 for blocking the liquid inlet 2 and the liquid outlet 3 is installed at one end of the valve stem 10 located in the cavity, the valve flap 4 is conical, the valve flap 4 is preferably made of rubber, the sealing surface of the valve flap 4, when the valve flap 4 is at the lowest point, the valve flap 4 blocks the liquid inlet 2 to block the liquid passage, and the sealing surface of the valve flap 4 adopts a conical line seal. The sealing effect is good and the service life is long. When the valve disc 4 is lifted, the liquid inlet 2 is connected with the liquid outlet 3. A groove for accommodating the valve disc 4 is provided on the cavity. The groove and the cavity are stepped. When the valve disc 4 is lifted to the highest point, the end of the valve disc 4 is completely received in the groove. The valve disc 4 is installed on the valve stem 10 through the valve disc cover 6. The end of the valve stem 10 located in the valve disc 4 is installed in the valve disc 4 through the split ring 5. An annular groove for installing the split ring 5 is provided on the circumferential wall of the valve stem 10. The annular groove is used to facilitate the fixation of the split ring 5 to prevent the valve stem 10 from detaching. The packing gland 13 is installed on the frame 9 by the second screw 14 and is connected by screws, which facilitates the disassembly and assembly of the packing gland 13, thereby facilitating the filling of the packing.

[0024] An O-ring 7 is installed between the valve body 1 and the frame 9. The O-ring 7 plays a sealing role and its material is preferably nitrile rubber.

[0025] Nitrile rubber is a synthetic rubber made by copolymerizing acrylonitrile and butadiene monomers through emulsion polymerization or solution polymerization. It has the following characteristics:

[0026] Oil resistance: Nitrile rubber has excellent oil resistance. The higher the acrylonitrile content, the better the oil resistance, but the cold resistance decreases accordingly.

[0027] Heat resistance: Nitrile rubber has good heat resistance and can be used for a long time in air at 120°C or in oil at 150°C.

[0028] Water resistance and air tightness: Nitrile rubber has good water resistance and air tightness.

[0029] Adhesive properties: Nitrile rubber has strong adhesive force.

[0030] Physical and mechanical properties: Nitrile rubber has good physical and mechanical properties, but its elasticity is slightly lower than that of natural rubber.

[0031] Chemical resistance: Nitrile rubber has good chemical resistance.

[0032] A packing cavity 12 is provided between the valve stem 10 and the cavity provided on the frame 9, and the packing cavity 12 is filled with packing, and the packing is 304+flexible graphite and flexible graphite, and the filling order of the packing is 304+flexible graphite, flexible graphite, 304+flexible graphite, and the packing plays a lubricating role during the movement of the valve stem 10, and a packing pad 11 for packing blocking is provided below the packing cavity 12, and the outer wall of the packing pad 11 contacts the cavity, and the inner wall of the packing pad 11 contacts the valve stem 10, and a packing gland 13 is installed on the packing cavity 12, and the packing gland 13 is sleeved on the valve stem 10, and the packing gland 13 plays a sealing role, and the packing gland 13 closes the cavity and the packing cavity 12 to prevent the packing from spilling from the top during the movement of the valve stem 10, and the packing gland 13 is installed on the frame 9 by the second screw 14, and the screw connection is used to facilitate the disassembly and assembly of the packing gland 13, thereby facilitating the filling of the packing.

[0033] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high-pressure needle-type stop valve, comprising a valve body (1), the valve body (1) being mounted on a frame (9) by means of a first screw (8), a cavity being arranged at the center of the valve body (1) and the frame (9), the cavity arranged on the valve body (1) being communicated with the cavity arranged on the frame (9), a valve stem (10) being arranged in the cavity, characterized in that: The valve body (1) is provided with a liquid inlet (2) and a liquid outlet (3), the liquid inlet (2) and the liquid outlet (3) are connected to the cavity, and a valve flap (4) for opening and closing the liquid inlet (2) and the liquid outlet (3) is installed at one end of the valve stem (10) located in the cavity, and the valve flap (4) is conical in shape, and a groove for accommodating the valve flap (4) is provided on the cavity, and the groove and the cavity are stepped, and when the valve flap (4) is lifted to the highest point, the end of the valve flap (4) is completely received in the groove.

2. A high pressure needle stop valve according to claim 1, characterized in that: The valve flap (4) is mounted on the valve stem (10) via a valve flap cover (6); one end of the valve stem (10) located inside the valve flap (4) is mounted inside the valve flap (4) via a split ring (5).

3. A high pressure needle stop valve according to claim 1, characterized in that: A packing cavity (12) is provided between the valve stem (10) and a cavity provided on the frame (9).

4. A high pressure needle stop valve according to claim 3, characterized in that: A packing pad (11) for packing blocking is arranged below the packing cavity (12).

5. A high pressure needle stop valve according to claim 4, characterized in that: A packing gland (13) is installed on the packing cavity (12), and the packing gland (13) is sleeved on the valve stem (10).

6. A high pressure needle stop valve according to claim 5, characterized in that: The packing gland (13) is mounted on the frame (9) via a second screw (14).

7. A high pressure needle stop valve according to claim 1, characterized in that: An O-ring (7) is installed between the valve body (1) and the frame (9).

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