Stop valve with high sealing performance

Abstract

The utility model belongs to the technical field of stop valves, and discloses a stop valve with high sealing performance, which comprises a valve body, a valve seat ring, a valve core, a valve core, a valve core and a valve core, the valve rod assembly is in line contact with the valve seat ring; the upper valve cover is installed and fixed on the top side of the inner cavity of the valve body in a sealing mode, and the outer side of the upper valve cover is sleeved with a hoop connected with the valve body through a nut; the sealing assembly is installed between the upper valve cover and the hoop and used for achieving the sealing effect between the valve rod assembly and the upper valve cover; and the spring is mounted between the sealing assembly and the top of the inner side of the hoop. By arranging a series of structures, no matter whether the stop valve is closed or opened, the stop valve adopts a mode that a plurality of seals coexist, and it is ensured that the valve can provide excellent sealing performance under the most stringent working condition.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of stop valve, concretely is a kind of high sealing performance stop valve. BACKGROUND

[0002] Stop valve is also called cut-off valve, belongs to forced sealing type valve, so when valve is closed, pressure must be applied to valve stem, to force sealing surface not to leak;Stop valve is suitable for high temperature, high pressure steam, chemicals, solvents, acid, gas and corrosive fluid;

[0003] The existing stop valve has certain drawbacks when in use, the internal sealing effect of the stop valve is poor, and based on this, a high sealing performance stop valve is proposed. UTILITY MODEL CONTENT

[0004] The utility model discloses a high sealing performance stop valve to solve the problem in the background art.

[0005] To achieve the above object, the utility model provides the following technical scheme: a kind of high sealing performance stop valve, comprising: valve body, the liquid outlet position of its inner cavity is equipped with valve seat ring;

[0006] Valve stem assembly, it carries out line contact with valve seat ring;

[0007] Upper valve cover, it is sealed and installed fixed in the inner cavity top side of valve body, the outside of upper valve cover is equipped with a clamp with the nut coupling of valve body;

[0008] Sealing assembly, it is installed between upper valve cover and clamp, it is used to realize the sealing effect between valve stem assembly and upper valve cover;

[0009] Spring, it is installed between sealing assembly and the inner side top of clamp.

[0010] Preferably, the valve seat ring and valve body adopt two different metal materials, and are integrally processed after laser welding, and the valve seat ring is located below the liquid inlet of the valve body.

[0011] Preferably, the valve stem assembly comprises:

[0012] Valve flap, it carries out line contact with the inner side top of valve seat ring, realizes the sealing of valve flap and valve seat ring, is used to cut off fluid, valve flap is connected with valve stem, clamp is installed on the outside of valve stem by the threaded hole of screwing, valve flap is also cooperated with the lower surface of upper valve cover, upper valve cover is sealed and installed on the outside bottom of valve stem by the guide hole of its bottom, and the guide hole is connected with the inner cavity of upper valve cover.

[0013] Preferably, the bottom end of the valve stem is provided with an embedding groove for movably embedding the top of the valve disc outside, so that the valve disc can rotate at the bottom end of the valve stem and extend above the clamp when the valve disc is extruded by the inner side of the valve seat ring.

[0014] Preferably, the sealing assembly comprises a packing filled in the inner cavity of the upper valve cover, the top of the packing is in close contact with a packing gland movably mounted in the inner cavity of the upper valve cover, the packing gland is fixedly sleeved on the outer side of the valve stem, the outer side of the packing gland is threadedly sleeved with a handle through the external thread of the packing gland, and a spring is sleeved on the outer side of the packing gland.

[0015] Preferably, the inner top of the clamp is provided with a spring placing groove for placing the top end of the spring, the spring placing groove is communicated with the threaded hole of the clamp, the bottom end of the spring is placed on the upper surface of the handle, and the spring is in a compressed state.

[0016] Preferably, the packing is composed of a bottom packing, a top packing and graphene between the two, and the packing can form a seal under the extrusion of the packing gland.

[0017] Compared with the prior art, the high sealing performance stop valve has the following beneficial effects:

[0018] 1. The high sealing performance stop valve, when closed, the valve seat ring and the valve disc form a first seal, the valve body and the upper valve cover form a second seal, the packing in the upper valve cover and the valve stem form a third seal, and the bottom end of the valve stem is provided with an embedding groove for movably embedding the top of the valve disc outside, so that the valve disc can rotate at the bottom end of the valve stem, thereby further enhancing the sealing effect of the valve seat ring and the valve disc.

[0019] 2. The high sealing performance stop valve, when opened, the valve disc and the upper valve cover form a first seal, the valve body and the upper valve cover form a second seal, and the packing in the upper valve cover and the valve stem form a third seal.

[0020] The high sealing performance stop valve adopts multiple sealing modes at the same time whether it is closed or opened, and can provide excellent sealing performance under the most severe working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a sectional view structure schematic diagram of the valve seat ring and the valve disc in the utility model in a line contact state;

[0022] Figure 2 It is a sectional view structure schematic diagram of the valve disc and the upper valve cover in the utility model in a line contact state;

[0023] Figure 3 This is a three-dimensional structural diagram of the present invention;

[0024] Figure 4 For the present utility model Figure 1 An enlarged schematic diagram of the valve body, valve seat ring, and valve disc being installed in sequence;

[0025] Figure 5 For the present utility model Figure 1 An enlarged structural diagram showing the installation of the valve body, valve stem, upper valve cover, packing, and packing gland.

[0026] Figure 6 For the present utility model Figure 2 An enlarged schematic diagram of the installation of the middle valve disc, valve stem, and upper valve cover.

[0027] In the diagram: 1. Valve body; 2. Valve seat ring; 3. Valve disc; 4. Valve stem; 5. Upper valve cover; 6. Packing; 7. Packing gland; 8. Handle; 9. Spring; 10. Clamp; 11. Handwheel. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] like Figure 1 As shown, the high-sealing-performance shut-off valve proposed in this embodiment includes: a valve body 1, with a valve seat ring 2 installed at the liquid outlet position of its inner cavity. The valve seat ring 2 and the valve body 1 are made of two different metal materials. They are first laser welded and then machined as a whole to ensure the machining accuracy of both. The valve seat ring 2 is located below the liquid inlet of the valve body 1.

[0030] In this implementation scheme: In order to solve the technical problems existing in the prior art, such as the "existing gate valve has certain drawbacks when used, and the gate valve has a defect of poor sealing effect inside" disclosed in the background art above, in combination with the use, this problem is obviously a real and difficult problem to solve. Therefore, in order to solve this technical problem, a sealing component is added to this application.

[0031] Furthermore:

[0032] like Figures 1 to 6 As shown, the high-sealing-performance shut-off valve proposed in this embodiment further includes: a valve stem assembly, which makes line contact with the valve seat ring 2;

[0033] The upper valve cover 5 is sealed and fixed on the top side of the inner cavity of the valve body 1. A clamp 10 is fitted on the outer side of the upper valve cover 5 and connected to the valve body 1 with a nut.

[0034] A sealing assembly, which is installed between the upper valve cover 5 and the clamp 10, is used to achieve a sealing effect between the valve stem assembly and the upper valve cover 5;

[0035] Spring 9 is installed between the sealing assembly and the inner top of clamp 10. Valve body 1 and clamp 10 can be made of carbon steel A105, low alloy steel F22, F91, F92 and stainless steel F316, etc., which have excellent corrosion resistance.

[0036] The valve stem assembly includes: a valve disc 3, which makes line contact with the inner top of the valve seat ring 2, achieving a seal between the valve disc 3 and the valve seat ring 2 for fluid flow control; a valve stem 4 is connected to the valve disc 3, wherein the bottom end of the valve stem 4 has an insertion groove for the outer top of the valve disc 3 to be movably fitted; this groove allows the valve disc 3 to rotate at the bottom end of the valve stem 4 when the valve disc 3 is pressed against the inner side of the valve seat ring 2, thereby ensuring the sealing effect between the valve disc 3 and the inner top of the valve seat ring 2; and the top of the valve stem 4... The valve stem 4 extends to the top of the clamp 10 and is equipped with a handwheel 11. The handwheel 11 is used to drive the valve stem 4 to rotate. The clamp 10 is threaded onto the outside of the valve stem 4 through a threaded hole, so that the rotating valve stem 4 can move vertically on the clamp 10. The valve disc 3 also cooperates with the lower surface of the upper valve cover 5. The upper valve cover 5 is sealed and fitted onto the bottom of the valve stem 4 through a guide hole at its bottom. The guide hole is connected to the inner cavity of the upper valve cover 5.

[0037] In this implementation scheme: When the high-sealing shut-off valve is opened, rotating the handwheel 11 causes the valve stem 4 to rotate at the threaded hole of the clamp 10, moving the valve stem 4 upward. The valve disc 3 moves upward under the force of the valve stem 4. Since the bottom end of the valve stem 4 has an insertion groove for the outer top of the valve disc 3 to be movably fitted, when the valve disc 3 is pressed against the lower surface of the upper valve cover 5, the valve disc 3 rotates at the bottom end of the valve stem 4, making line contact with the lower surface of the upper valve cover 5, creating a good seal. This prevents fluid from flowing into the valve stem 4, allowing the fluid to flow out from the outlet. Figure 2 As shown;

[0038] When the shut-off valve is closed, rotating the handwheel 11 in the reverse direction causes the valve stem 4 to rotate at the threaded hole of the clamp 10, moving the valve stem 4 downwards. The valve disc 3 is then pressed downwards by the downward force of the valve stem 4. Since the bottom end of the valve stem 4 has an insertion groove for the top of the valve disc 3 to move and fit, when the valve disc 3 is pressed against the inner side of the valve seat ring 2, the valve disc 3 rotates at the bottom end of the valve stem 4. This ensures a good contact and sealing effect between the valve disc 3 and the valve seat ring 2, effectively blocking the flow of fluid. Figure 1 As shown.

[0039] It should be noted that when the upper valve cover 5 is installed in a sealed and fixed manner on the top side of the inner cavity of the valve body 1, a sealing gasket is installed between the two.

[0040] Furthermore;

[0041] The sealing assembly includes packing 6 filling the inner cavity of the upper valve cover 5. The top of the packing 6 is in close contact with a packing gland 7, which is movably and sealingly mounted within the inner cavity of the upper valve cover 5. The packing 6 consists of a bottom packing, a top packing, and graphene with anti-corrosion properties located between them. The packing 6 forms a seal under the compression of the packing gland 7. The packing gland 7 is fixedly fitted onto the outside of the valve stem 4. A handle 8 is threaded onto the outside of the packing gland 7 via its own external threads. The handle 8 engages with the external threads of the packing gland 7. When the handle... 8 rotates and moves vertically on the outside of the packing gland 7 to adjust the compression of the spring 9. The spring 9 is fitted on the outside of the packing gland 7 and is in a compressed state. A spring placement groove is provided on the top of the inner side of the clamp 10 for placing the top of the spring 9. The spring placement groove is connected to the threaded hole of the clamp 10. The bottom end of the spring 9 is placed on the upper surface of the handle 8. The valve stem 4, the upper valve cover 5 and the packing gland 7 are made of martensitic stainless steel and have been surface treated, which has good corrosion resistance and wear resistance.

[0042] In this implementation scheme: when the shut-off valve is opened, the upward-moving valve stem 4 will cause the valve disc 3 to make line contact with the lower surface of the upper valve cover 5. At this time, the valve disc 3 and the upper valve cover 5 form a first seal, the valve body 1 and the upper valve cover 5 form a second seal, and the packing 6 in the upper valve cover 5 and the valve stem 4 form a third seal. It can be seen from the above that the shut-off valve has a very strong sealing effect when it is opened.

[0043] When the stop valve is closed, the downward moving valve rod 4 drives the valve disc 3 to move downward, and the valve rod 4 also drives the handle 8 and the packing gland 7 to move downward in the upper valve cover 5 to extrude the packing 6, so that the packing 6 can form a seal under the extrusion of the packing gland 7, until the valve disc 3 is in line contact with the inner bottom of the valve seat ring 2, so that the packing 6, the valve seat ring 2 and the valve disc 3 form a first seal, the valve body 1 and the upper valve cover 5 form a second seal, and the packing 6 in the upper valve cover 5 and the valve rod 4 form a third seal. A fitting groove is formed in the bottom end of the valve rod 4 for the outer top of the valve disc 3 to fit and move, so that the valve disc 3 rotates at the bottom end of the valve rod 4, and the sealing effect of the valve seat ring 2 and the valve disc 3 is good. As can be seen, the stop valve has a strong sealing effect when it is closed.

[0044] The use method of the embodiment is that when the high-sealing stop valve is opened, the hand wheel 11 is rotated to drive the valve rod 4 to rotate at the threaded hole of the clamp 10, so that the valve rod 4 moves upward, and the valve disc 3 moves upward under the action of the valve rod 4. Since a fitting groove is formed in the bottom end of the valve rod 4 for the outer top of the valve disc 3 to fit and move, when the valve disc 3 is extruded with the lower surface of the upper valve cover 5, the valve disc 3 rotates at the bottom end of the valve rod 4 to be in line contact with the lower surface of the upper valve cover 5 to form a good seal, so that the fluid does not flow to the valve rod 4, and the fluid flows out from the liquid outlet position, as shown in FIG. 6. In addition, the upward moving valve rod 4 drives the valve disc 3 to be in line contact with the lower surface of the upper valve cover 5, so that the valve disc 3 and the upper valve cover 5 form a first seal, the valve body 1 and the upper valve cover 5 form a second seal, and the packing 6 in the upper valve cover 5 and the valve rod 4 form a third seal. As can be seen, the stop valve has a strong sealing effect when it is opened. Figure 2

[0045] When the stop valve is closed, the hand wheel 11 is reversely rotated to drive the valve rod 4 to rotate at the threaded hole of the clamp 10, so that the valve rod 4 moves downward, and the valve disc 3 is extruded downward under the downward action of the valve rod 4. Since a fitting groove is formed in the bottom end of the valve rod 4 for the outer top of the valve disc 3 to fit and move, when the valve disc 3 is extruded with the inner side of the valve seat ring 2, the valve disc 3 rotates at the bottom end of the valve rod 4 to ensure that the valve disc 3 and the valve seat ring 2 have a good contact sealing effect, so as to play a role in stopping the flow of fluid. As shown in FIG. 7. Figure 1 ​When the valve is closed, the valve stem 4 drives the handle 8 and the packing gland 7 to move downward in the upper valve cover 5, so as to extrude the packing 6, and the packing 6 is extruded by the packing gland 7 to form a seal, until the valve disc 3 is in line contact with the inner bottom of the valve seat ring 2, so that the packing 6, the valve seat ring 2 and the valve disc 3 form a first seal, the valve body 1 and the upper valve cover 5 form a second seal, and the packing 6 in the upper valve cover 5 and the valve stem 4 form a third seal.

[0046] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and not for limiting the present application, although the foregoing detailed description of the present application is made with reference to the foregoing embodiments, for those skilled in the art, it still can be modified, or part of the technical features of the equivalent replacement. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application, shall be included within the scope of the present application.

Claims

1. A high sealing performance stop valve comprising a valve body (1), characterized in that: The utility model relates to a valve seat ring (2) and valve body (1) adopt two different metal materials, and the two are first adopted laser welding, and then integrally process, and the valve seat ring (2) is located the lower position of valve body (1) liquid inlet. The valve stem assembly includes: The valve stem assembly includes: The valve stem (4) bottom end is provided with an embedding groove for the outside top of valve clapper (3) to move and embed, for the rotation of valve clapper (3) at the bottom end of valve stem (4) when the extrusion of valve clapper (3) and valve seat ring (2) inside occurs, and the top end of valve stem (4) extends to the upper side of clamping hoop (10) and is provided with hand wheel (11). The sealing assembly includes filler (6) filled in the inside of upper valve cover (5) inner cavity, the top of filler (6) is tightly contacted with filler gland (7) sealingly and movably installed in the inner cavity of upper valve cover (5), filler gland (7) is fixedly sleeved on the outside of valve stem (4), the outside of filler gland (7) is threadedly sleeved with handle (8) through the external thread of filler gland (7) itself, and spring (9) is sleeved on the outside of filler gland (7). The inside top of clamping hoop (10) is provided with a spring placing groove for placing the top end of spring (9), the spring placing groove is communicated with the threaded hole of clamping hoop (10), the bottom end of spring (9) is placed on the upper surface of handle (8), and spring (9) is in compression state.

2. A high sealing performance stop valve according to claim 1, characterized in that: The filler (6) is composed of a bottom packing, a top packing, and a graphene layer between the two packings for corrosion resistance, and the filler (6) can form a seal under the extrusion of the filler gland (7).

3. A high sealing performance stop valve according to claim 1, characterized in that: ​ ​ 4. A high sealing performance stop valve according to claim 3, characterized in that: ​ 5. A high sealing performance stop valve according to claim 3, characterized in that: ​ 6. A high sealing performance stop valve according to claim 5, characterized in that: ​ 7. A high sealing performance stop valve according to claim 5, characterized in that: ​

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