Safety stop valve

Abstract

The utility model relates to the technical field of stop valves, in particular to a safety stop valve which comprises a valve body, an oil inlet flange is installed at one end of the valve body through a screw, an oil outlet flange is installed at the other end of the valve body through a sleeve, and a spherical valve, a needle valve and a safety valve are installed in the valve body. The needle valve and the safety valve are oppositely arranged on the valve body, the safety valve and the needle valve are matched to form a first cut-off sealing function, and the spherical valve forms a second cut-off sealing function, so that the device has good pressure resistance, and has two cut-off sealing functions and one overpressure discharge function in the use process; the stop pin is installed at the short end of the handle, the pin hole used for being matched with the stop pin is formed in the valve body, the position of the handle can be fixed through matching of the stop pin and the valve body, and therefore the ball body is fixed.

Description

Technical Field

[0001] The utility model relates to the technical field of one-way valves, in particular to a safety stop valve. Background Art

[0002] The stop valve has a very reliable cut-off action, making this valve very suitable for use as a medium cut-off, regulation and throttling. Once the valve disc of the stop valve is in the open state, there is no contact between its valve seat and the valve disc sealing surface, and it has a very reliable cut-off action. This valve is very suitable for use as a medium cut-off, regulation and throttling. The stop valve, also called the cut-off valve, is one of the most widely used valves.

[0003] Most of the existing stop valves are single-way valves with poor pressure resistance, poor blocking effect and low safety performance. Utility Model Content

[0004] The technical solution adopted by the utility model is to provide a safety stop valve, including a valve body, one end of the valve body is installed with an oil inlet flange by means of screws, the other end of the valve body is installed with an oil outlet flange by means of a sleeve, a ball valve, a needle valve and a safety valve are installed in the valve body, and the needle valve and the safety valve are arranged opposite to each other on the valve body.

[0005] Furthermore, the ball valve comprises a ball, and the ball is provided with a handle via a valve stem.

[0006] Furthermore, both ends of the handle extend outside the valve stem, a stop pin is installed at the short end of the handle, and a pin hole for cooperating with the stop pin is provided on the valve body.

[0007] Furthermore, the ball is installed in the valve body through the valve seat.

[0008] Furthermore, sealing rings are provided between the oil inlet flange, the oil outlet flange and the valve body.

[0009] Furthermore, the handle is provided with an upward bend.

[0010] The beneficial effects of the utility model are:

[0011] The safety valve of this device cooperates with the needle valve to form the first cut-off sealing function, and the ball valve forms the second cut-off sealing function. Therefore, this device has good pressure resistance. During use, it has two cut-off sealing functions and one overpressure discharge function.

[0012] A stop pin is installed at the short end of the handle of the device, and a pin hole for cooperating with the stop pin is arranged on the valve body. The stop pin and the valve body can be used to fix the position of the handle, thereby fixing the state of the ball. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall cross-sectional structure of a safety stop valve described in the utility model;

[0014] Figure 2 It is a schematic diagram of the overall front view structure of a safety stop valve described in the utility model;

[0015] Figure 3 It is a schematic side view of the overall structure of a safety stop valve described in the utility model;

[0016] Figure 4 It is a schematic diagram of the three-dimensional structure of the connection between the valve body, the oil inlet flange and the oil outlet flange of a safety stop valve described in the utility model;

[0017] In the figure: valve body 1; oil inlet flange 2; screw 3; needle valve 4; and safety valve 5; oil outlet flange 6; sleeve 7; ball 8; valve seat 9; valve stem 10; handle 11; stop pin 12. DETAILED DESCRIPTION

[0018] 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.

[0019] Example 1

[0020] This embodiment discloses a safety stop valve. Figure 1-Figure 4As shown, it includes a valve body 1, one end of the valve body 1 is installed with an oil inlet flange 2 through a screw 3, and the other end of the valve body 1 is installed with an oil outlet flange 6 through a sleeve 7. No less than two annular gaskets are arranged between the sleeve 7 and the valve body 1. It is characterized in that: a ball valve, a needle valve 4 and a safety valve 5 are installed in the valve body 1, and the needle valve 4 and the safety valve 5 are arranged opposite to each other on the valve body 1. The safety valve 5 controls the pressure not to exceed the specified value, and protects personal safety and equipment operation. The safety valve 5 is a spring-type safety valve. The valve valve or plunger and other sealing parts are locked by the elastic pressure of the spring. Once the pressure of the pressure vessel is abnormal, the high pressure generated will overcome the spring pressure of the safety valve, so the locking device is pushed open to form a pressure relief channel to release the high pressure. The needle valve 4 is a stop valve, which is used to open or cut off the pipeline. The needle valve has the advantages of easy installation and disassembly, tight connection, fire prevention, explosion prevention, high pressure resistance, good sealing performance, etc. Therefore, the safety valve 5 cooperates with the needle valve 4 to form the first cut-off sealing function, and the ball valve 4 is used to open or cut off the pipeline. The spherical valve forms a second cut-off sealing function, so the device has good pressure resistance. During use, it has two cut-off sealing functions and an overpressure discharge function. The spherical valve includes a ball 8, which is located in the valve body 1. The ball 8 is installed with a handle 11 through a valve stem 10. A sealing ring is arranged between the valve stem 10 and the valve body. The handle 11 can facilitate the control of the ball. Both ends of the handle 11 extend outside the valve stem 10. A stop pin 12 is installed at the short end of the handle 11. The valve body 1 is provided with a stop pin 12 for contacting with the stop pin 12. The pin hole matched with the pin 12 can fix the position of the handle 11 by using the stop pin 12, so as to fix the state of the ball 8. The ball 8 is installed in the valve body 1 through the valve seat 9, and the ball 8 can be fixed by using the valve seat 9. The oil inlet flange 2 and the oil outlet flange 6 are provided with sealing rings between the valve body 1, and the sealing rings can improve the sealing of the connection. The handle 11 is provided with an upward bend, and the bend can be used to prevent the hand from colliding with the valve body 1 during the operation of the handle 11, causing injuries to the hand. The material of the sealing ring and the annular gasket are both selected from nitrile rubber, which is a synthetic rubber copolymerized by acrylonitrile and butadiene monomers through emulsion polymerization or solution polymerization, and it has the following characteristics:

[0021] Oil resistance: Nitrile rubber has excellent oil resistance. The higher the acrylonitrile content, the better the oil resistance, but the cold resistance decreases accordingly.

[0022] 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.

[0023] Water resistance and air tightness: Nitrile rubber has good water resistance and air tightness.

[0024] Adhesive properties: Nitrile rubber has strong adhesive force.

[0025] Physical and mechanical properties: Nitrile rubber has good physical and mechanical properties, but its elasticity is slightly lower than that of natural rubber.

[0026] Chemical resistance: Nitrile rubber has good chemical resistance.

[0027] 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 safety stop valve, comprising a valve body (1), one end of the valve body (1) being mounted with an oil inlet flange (2) by means of screws (3), and the other end of the valve body (1) being mounted with an oil outlet flange (6) by means of a sleeve (7), characterized in that: A spherical valve, a needle valve (4) and a safety valve (5) are installed in the valve body (1); the needle valve (4) and the safety valve (5) are arranged opposite to each other on the valve body (1).

2. A safety stop valve according to claim 1, characterized in that: The ball valve comprises a ball (8), and the ball (8) is provided with a handle (11) via a valve stem (10).

3. A safety stop valve according to claim 2, characterized in that: Both ends of the handle (11) extend outside the valve stem (10), a stop pin (12) is installed at the short end of the handle (11), and a pin hole for cooperating with the stop pin (12) is provided on the valve body (1).

4. A safety stop valve according to claim 2, characterized in that: The ball (8) is installed in the valve body (1) via the valve seat (9).

5. A safety stop valve according to claim 1, characterized in that: Sealing rings are provided between the oil inlet flange (2) and the oil outlet flange (6) and the valve body (1).

6. A safety stop valve according to claim 2, characterized in that: The handle (11) is provided with an upward bend.

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