Safety switch stop valve

Abstract

The utility model relates to a safety type switch stop valve which comprises a valve body, a valve cover, a valve rod and a valve element assembly, the valve body is provided with a liquid inlet channel and a liquid outlet channel, and the valve element assembly comprises a valve element piece, a locking screw rod, a nut and a sealing piece. According to the length design of the locking screw, the locking screw extends to the position of the valve cover, when the valve element assembly is loosened due to long-time vibration or other external force, due to the fact that the locking screw is long, the nut cannot be completely disengaged from the locking screw, and therefore the situation that upstream equipment and downstream equipment of the stop valve are affected due to loosening of fastening pieces such as the nut is avoided; and good sealing performance and working stability of the valve are always kept in the long-term use process.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of stop valve, especially a safety type switch stop valve. BACKGROUND

[0002] The stop valve is a common valve type, and is widely applied to petroleum, chemical industry, electric power, metallurgy and the like. The main function of the stop valve is to control the on-off of fluid through the reciprocating movement of the valve core, so as to realize the flow regulation or cut-off of the medium in the pipeline. The stop valve usually comprises a valve body, a valve core for controlling the flow and disconnection of the valve body, a valve rod for controlling the movement of the valve core, and a fastener such as a nut and a screw for threadedly fastening the valve core. Due to the influence of external factors such as vibration, temperature change and medium corrosion, the fastener is prone to loosening, which may enter the upstream and downstream equipment along with the fluid, thereby affecting the normal operation of the hydraulic system and even causing serious safety accidents. SUMMARY

[0003] In order to overcome the shortcomings of the background art, the utility model adopts the technical scheme of a safety type switch stop valve, which comprises a valve body, a valve cover, a valve rod and a valve core assembly. The valve body is provided with an inlet channel and an outlet channel. The valve cover is detachably connected to the valve body. The valve rod is slidably connected to the valve cover and is used for controlling the movement of the valve core assembly. The reciprocating movement of the valve core assembly connects or disconnects the inlet channel and the outlet channel. The valve core assembly comprises a valve core, a locking screw, a nut and a sealing element. The locking screw is threadedly connected to the nut and the valve rod and extends to the valve cover. The valve core is clamped between the locking screw and the valve core.

[0004] According to the above technical scheme, the valve rod and the nut are combined into a double-nut structure, which enhances the stability of the valve core assembly. The length of the locking screw is designed to extend to the valve cover. When the valve core assembly is loosened due to long-term vibration or other external forces, the nut cannot be completely separated from the locking screw due to the relatively long length of the locking screw, thereby avoiding the loosening of the nut and affecting the upstream and downstream equipment of the stop valve. The valve always maintains good sealing performance and working stability during long-term use.

[0005] The utility model is further provided with coaxially distributed through holes and threaded holes in the valve core and the valve rod. The locking screw is threadedly connected to the threaded holes through the through holes. The locking screw is provided with a pressure disc part. The sealing element is arranged between the pressure disc part and the valve core.

[0006] Further, the valve core is provided with an outer ring part at the bottom. The locking screw is provided with a cylindrical part on the pressure disc part. The outer ring part and the cylindrical part are combined to form a circular groove for mounting the sealing element.

[0007] The circular groove is designed to provide a stable installation space for the sealing element, so that the sealing element is not damaged due to installation deviation.

[0008] The sealing element is further provided with a fixing portion and a sealing portion on the inner and outer sides thereof, and the sealing portion is inclined to the fixing portion.

[0009] Further, the sealing element is provided with a circular ring portion, and the locking screw is provided with a positioning groove corresponding to the circular ring portion.

[0010] Further, the sealing element is provided with an opening groove between the fixing portion and the sealing portion.

[0011] When the sealing element is installed in the circular groove, the sealing portion and the fixing portion are deformed, and the stress generated when the sealing element is deformed is adapted through the opening groove, so that the sealing portion can better fit the bottom surface of the valve core, and the phenomenon of the sealing element being warped due to installation is avoided.

[0012] The valve body is further provided with an intermediate pipe corresponding to the valve core assembly between the inlet channel and the outlet channel, and the intermediate pipe is provided with a first protruding portion corresponding to the sealing portion on one side of the valve core assembly, and the other side is provided with a second protruding portion for preventing the locking screw from falling off.

[0013] The first protruding portion improves the sealing effect of the valve core and the valve body, and the inner diameter of the second protruding portion is smaller than the outer diameter of the pressure plate portion of the locking screw, so that the locking screw is effectively prevented from loosening, and the safety of the stop valve is enhanced.

[0014] The embodiments of the utility model will be further described below with reference to the drawings. DRAWINGS

[0015] Figure 1 It is a sectional view of the utility model;

[0016] Figure 2 It is a sectional view of the utility model Figure 1 It is a local enlarged view of the middle A view;

[0017] Figure 3 It is a perspective view of the locking screw of the utility model;

[0018] Figure 4 It is a sectional view of the sealing element of the utility model;

[0019] Wherein: 1 - valve body, 2 - valve cover, 3 - valve stem, 4 - valve core assembly, 5 - inlet, 6 - outlet, 7 - valve core, 8 - locking screw, 9 - nut, 10 - sealing element, 11 - through hole, 12 - threaded hole, 13 - pressure plate, 14 - outer ring, 15 - cylindrical part, 16 - circular groove, 17 - fixed part, 18 - sealing part, 19 - circular ring, 20 - positioning groove, 21 - open slot, 25 - intermediate tube, 26 - first protruding part, 27 - second protruding part; DETAILED DESCRIPTION

[0020] As Figure 1 , 2 shown, the embodiment provides a safety switch stop valve, comprising a valve body 1, a valve cover 2, a valve stem 3 and a valve core assembly 4, the valve body 1 is provided with an inlet 5 and an outlet 6, the valve body 1 is detachably connected with the valve cover 2, the valve cover 2 is slidingly connected with the valve stem 3 for controlling the movement of the valve core assembly 4, the reciprocating movement of the valve core assembly 4 connects or disconnects the inlet 5 and the outlet 6, the valve core assembly 4 comprises a valve core 7, a locking screw 8, a nut 9 and a sealing element 10, the locking screw 8 is threadedly connected with the nut 9 and the valve stem 3 through the valve core 7, and the locking screw 8 extends to the valve cover 2, and the valve core 7 is clamped between the locking screw 8 and the valve core 7.

[0021] As Figure 3 shown, in the embodiment, the valve core 7 and the valve stem 3 are respectively provided with coaxially distributed through holes 11 and threaded holes 12, the locking screw 8 is threadedly connected in the threaded hole 12 through the through hole 11, the locking screw 8 is provided with a pressure plate 13, the sealing element 10 is arranged between the pressure plate 13 and the valve core 7, the bottom of the valve core 7 is provided with an outer ring 14, the locking screw 8 is provided with a cylindrical part 15 on the pressure plate 13, and the outer ring 14 and the cylindrical part 15 combine to form a circular groove 16 for installing the sealing element 10.

[0022] As Figure 4 shown, in the embodiment, the inner and outer sides of the sealing element 10 are respectively provided with a fixed part 17 and a sealing part 18, and the sealing part 18 is inclined to the fixed part 17, the fixed part 17 is clamped between the valve core 7 and the locking screw 8, the sealing element 10 is provided with a circular ring 19, the locking screw 8 is provided with a positioning groove 20 corresponding to the circular ring 19, the circular ring 19 is clamped in the positioning groove 20, and the sealing element 10 is provided with an open slot 21 between the fixed part 17 and the sealing part 18, when the sealing element 10 is installed in the circular groove, the sealing part 18 and the fixed part 17 are deformed, and the open slot 21 adapts to the stress generated when the sealing element 10 deforms, so that the sealing part 18 can better fit the valve core bottom surface.

[0023] As Figure 2As shown, in the embodiment, the valve body 1 is provided with an intermediate pipe 25 corresponding to the valve core assembly 4 between the liquid inlet channel 5 and the liquid outlet channel 6, the side of the intermediate pipe 25 towards the valve core assembly 4 is provided with a first protruding part 26 corresponding to the sealing part 18, and the other side is provided with a second protruding part 27 for preventing the locking screw 8 from falling off.

[0024] In the utility model, the valve rod 3 and the nut 9 are combined into a double-nut structure, the stability of the valve core assembly 4 is enhanced, the length of the locking screw 8 is designed to extend to the valve cover 2, when the valve core assembly 4 is loosened due to long-time vibration or other external force, the valve core assembly 4 will not completely separate from the valve rod 3 due to the long length of the locking screw 8, so that the nut 9 and other small parts will not flow to the upstream and downstream equipment of the stop valve due to loosening, and the valve always maintains good sealing performance and working stability in the long-term use process.

[0025] The above are preferred embodiments of the application, and do not limit the protection scope of the application, so that: equivalent changes made according to the structure, shape and principle of the application should be covered in the protection scope of the application.

Claims

1. A safety switch stop valve, comprising a valve body (1), a valve cover (2), a valve stem (3) and a valve core assembly (4), the valve body (1) is provided with an inlet channel (5) and an outlet channel (6), the valve body (1) is detachably connected with the valve cover (2), the valve cover (2) is slidingly connected with the valve stem (3) for controlling the movement of the valve core assembly (4), the reciprocating movement of the valve core assembly (4) connects or disconnects the inlet channel (5) and the outlet channel (6), characterized in that, The valve core assembly (4) comprises a valve core piece (7), a locking screw (8), a nut (9) and a sealing piece (10), the locking screw (8) is screwed with the nut (9) and the valve stem (3) through the valve core piece (7), and the locking screw (8) extends to the valve cover (2), and the valve core piece (7) is clamped between the locking screw (8) and the valve core piece (7).

2. A safety shut-off valve according to claim 1, characterised in that: The valve core piece (7) and the valve stem (3) are respectively provided with coaxial through holes (11) and threaded holes (12), the locking screw (8) is screwed in the threaded hole (12) through the through hole (11), the locking screw (8) is provided with a pressure plate part (13), and the sealing piece (10) is arranged between the pressure plate part (13) and the valve core piece (7).

3. A safety shut-off valve according to claim 2, wherein: The bottom of the valve core piece (7) is provided with an outer ring part (14), the locking screw (8) is provided with a cylindrical part (15) on the pressure plate part (13), and the outer ring part (14) and the cylindrical part (15) combine to form a circular ring groove (16) for installing the sealing piece (10).

4. A safety shut-off valve according to claim 3, wherein: The inner and outer sides of the sealing piece (10) are respectively provided with a fixed part (17) and a sealing part (18), and the sealing part (18) is inclined to the fixed part (17), and the fixed part (17) is clamped between the valve core piece (7) and the locking screw (8).

5. A safety shut-off valve according to claim 4, wherein: The sealing piece (10) is provided with a circular ring part (19), the locking screw (8) is provided with a positioning groove (20) corresponding to the circular ring part (19), and the circular ring part (19) is clamped in the positioning groove (20).

6. A safety shut-off valve according to claim 5, wherein: The sealing piece (10) is provided with an opening groove (21) between the fixed part (17) and the sealing part (18).

7. A safety shut-off valve according to claim 4, wherein: The valve body (1) is provided with a middle pipe (25) corresponding to the valve core assembly (4) between the inlet channel (5) and the outlet channel (6), one side of the middle pipe (25) towards the valve core assembly (4) is provided with a first protruding part (26) corresponding to the sealing part (18), and the other side is provided with a second protruding part (27) for preventing the locking screw (8) from falling.

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