Pressure balance type soft sealing sleeve single-seat regulating valve

Abstract

The utility model discloses a pressure balance type soft sealing sleeve single-seat adjusting valve which comprises a valve body, a valve cover, a valve element assembly and a sealing assembly for achieving sealing of the valve element assembly and the valve cover. The valve element assembly comprises a valve rod and a valve element arranged at the bottom end of the valve rod, the valve element is installed at the bottom end of the valve rod through a cylindrical pin, the bottom end of the valve rod penetrates through the valve deck to be arranged in the cavity of the valve body, and the valve element is located in the center of the cavity. The sealing assembly is arranged in the valve cover and comprises a packing cushion block, packing, a packing gland and a gland nut which are arranged on the valve rod in a sleeving mode. The sealing assembly composed of the packing cushion block, the packing, the packing gland and the gland nut is arranged between the valve rod and the valve cover, so that the purposes of improving the stability of the valve body, improving the sealing performance of the valve body and prolonging the service life of the valve body are achieved.

Description

Technical Field

[0001] The utility model relates to the field of production and manufacturing of valve bodies, and particularly relates to a pressure-balanced soft-sealed sleeve single-seat regulating valve. Background Art

[0002] In the prior art, traditional single-seat valves and sleeve single-seat valves are old products in the 1980s and 1990s of the last century, and mainly consist of components such as valve bodies, valve covers, valve cores, valve stems, sleeves, valve seats, packings, gaskets, etc. One end of the valve body is provided with an inlet, and the other end is provided with an outlet. The valve core is guided by a guide sleeve and can move up and down in the guide sleeve.

[0003] However, this valve structure is obsolete. When fluids with a large pressure difference pass through the valve, its stability is poor, the leakage is large, and the service life is also greatly reduced.

[0004] How to solve the above technical problems is an urgent technical problem that those skilled in the art in this technical field need to solve at present.

[0005] The information disclosed in this background art section is only intended to deepen the understanding of the overall background art of the utility model, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art known to those skilled in the art. Summary of the Utility Model

[0006] In order to solve the above technical problems, the utility model provides a pressure-balanced soft-sealed sleeve single-seat regulating valve to achieve the purposes of improving the stability of the valve body, enhancing the sealing performance of the valve body, and extending the service life of the valve body.

[0007] To achieve the above purpose, the technical solution of the utility model is as follows:

[0008] A pressure-balanced soft-sealed sleeve single-seat regulating valve includes a valve body, a valve cover, a valve core assembly, and a sealing assembly for sealing the valve core assembly and the valve cover;

[0009] A cavity in an S shape for fluid to flow through is arranged in the valve body;

[0010] The valve cover is arranged on the valve body;

[0011] The valve core assembly includes a valve stem and a valve core arranged at the bottom end of the valve stem. The valve core is installed at the bottom end of the valve stem through a cylindrical pin. The bottom end of the valve stem passes through the valve cover and is placed inside the cavity of the valve body, and the valve core is located at the center of the cavity;

[0012] The sealing assembly is arranged inside the valve cover. The sealing assembly includes a packing spacer block, packing, a packing gland, and a gland nut sleeved on the valve stem. The packing spacer block, the packing gland, and the gland nut are sleeved on the valve stem from bottom to top, and the packing is arranged between the packing spacer block and the packing gland.

[0013] In the utility model, a sealing assembly composed of a packing spacer block, packing, a packing gland, and a gland nut is arranged between the valve stem and the valve cover, so as to achieve the purposes of improving the stability of the valve body, enhancing the sealing performance of the valve body, and prolonging the service life of the valve body.

[0014] Further, it is worth noting that a disc spring is arranged between the gland nut and the packing gland.

[0015] Further, it is worth noting that a valve seat, a sleeve, and a guide sleeve are sequentially arranged in the valve body from bottom to top; a through hole for the valve core to pass through is arranged at the center of the valve seat; a wound gasket is arranged between the valve seat and the valve body;

[0016] A communication port communicating with the cavity is arranged on the side wall of the sleeve;

[0017] The guide sleeve is arranged at the top of the sleeve, and a graphite sealing gasket and a metal sealing gasket are arranged between the guide sleeve and the sleeve;

[0018] A retaining ring is arranged at the top of the guide sleeve, a protrusion matched with the retaining ring is arranged on the side wall of the valve body for arranging the valve body assembly, the retaining ring is mounted on the protrusion, and a toothed gasket is arranged between the retaining ring and the protrusion.

[0019] Further, it is worth noting that a soft sealing ring is arranged on the side wall of the valve core. When the valve core is arranged in the sleeve, the soft sealing ring is closely attached to the valve seat, and the part of the valve core below the soft sealing ring passes through the through hole to realize the closing of the whole valve body.

[0020] Further, it is worth noting that a pressure balance hole is arranged on the valve core, and the direction of the pressure balance hole is the same as the direction of the valve stem. By arranging the pressure balance hole and the soft sealing ring on the valve core, the unbalanced force generated during the flow of the medium with a large pressure difference is reduced, the stability of the valve is increased, the output force required by the actuator is reduced, the leakage amount is reduced, the leakage grade is improved, and the safe, reliable, and long-term use of the valve is ensured.

[0021] The utility model has the following advantages:

[0022] 1. In the utility model, a sealing assembly composed of a packing spacer block, packing, a packing gland, and a gland nut is arranged between the valve stem and the valve cover, so as to achieve the purposes of improving the stability of the valve body, enhancing the sealing performance of the valve body, and prolonging the service life of the valve body.

[0023] 2. The utility model reduces the unbalanced force generated during the flow of media with large pressure differences by setting pressure balance holes and soft sealing rings on the valve core, increases the stability of the valve, reduces the output force required by the actuator, reduces the leakage rate and improves the leakage level, ensuring the safe, reliable and long-term use of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art.

[0025] Figure 1 FIG. is a schematic structural diagram of a pressure balance type soft seal sleeve single-seat control valve disclosed in an embodiment of the present utility model;

[0026] Figure 2 FIG. is a schematic structural diagram of a valve core assembly in a pressure balance type soft seal sleeve single-seat control valve disclosed in an embodiment of the present utility model;

[0027] The corresponding component names represented by the numbers and letters in the figure are as follows:

[0028] 1. Valve body 2. Valve cover 3. Cavity 4. Protrusion 5. Toothed gasket 6. Valve stem 7. Valve core 8. Cylindrical pin

[0029] 9. Soft seal ring 10. Pressure balance hole 11. Packing spacer 12. Packing 13. Packing gland 14. Gland nut

[0030] 15. Disc spring 16. Valve seat 17. Sleeve 18. Guide sleeve 19. Spiral wound gasket 20. Graphite sealing washer

[0031] 21. Metal sealing washer 22. Retaining ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model.

[0033] The present utility model provides a pressure balance type soft seal sleeve single-seat control valve, and its working principle is to achieve the purposes of improving the stability of the valve body, improving the sealing performance of the valve body and extending the service life of the valve body by providing a sealing assembly composed of a packing spacer, packing, packing gland and gland nut between the valve stem and the valve cover.

[0034] The present utility model will be further described in detail below with reference to the embodiments and specific implementation manners.

[0035] As Figure 1 and Figure 2As shown in the figure, a pressure-balanced soft-sealed sleeve single-seat control valve includes a valve body 1, a valve cover 2, a valve core assembly, and a sealing assembly for sealing the valve core assembly and the valve cover.

[0036] Among them:

[0037] A cavity 3 for fluid flow is provided inside the valve body.

[0038] The valve cover is arranged on the valve body.

[0039] The valve core assembly includes a valve stem 6 and a valve core 7 arranged at the bottom end of the valve stem. The valve core is installed at the bottom end of the valve stem through a cylindrical pin 8. The bottom end of the valve stem passes through the valve cover and is placed inside the cavity of the valve body. The valve core is located at the center of the cavity. A soft seal ring 9 is arranged on the side wall of the valve core. When the valve core is arranged inside the sleeve, the soft seal ring is closely attached to the valve seat. The part of the valve core below the soft seal ring passes through the through hole to realize the closing of the entire valve body. A pressure balance hole 10 is arranged on the valve core, and the direction of the pressure balance hole is the same as that of the valve stem.

[0040] The sealing assembly is arranged inside the valve cover. The sealing assembly includes a packing spacer 11, packing 12, a packing gland 13, and a gland nut 14 sleeved on the valve stem. The packing spacer, the packing gland, and the gland nut are sleeved on the valve stem from bottom to top, and the packing is arranged between the packing spacer and the packing gland. A disc spring 15 is arranged between the gland nut and the packing gland.

[0041] A valve seat 16, a sleeve 17, and a guide sleeve 18 are sequentially arranged inside the valve body from bottom to top. A through hole for the valve core to pass through is provided at the center of the valve seat. A spiral wound gasket 19 is arranged between the valve seat and the valve body. A communication port communicating with the cavity is arranged on the side wall of the sleeve. The guide sleeve is arranged on the top of the sleeve, and a graphite sealing gasket 20 and a metal sealing gasket 21 are arranged between the guide sleeve and the sleeve. A retaining ring 22 is arranged at the top of the guide sleeve. A protrusion 4 matched with the retaining ring is arranged on the side wall of the valve body for arranging the valve body assembly. The retaining ring is placed on the protrusion, and a serrated gasket 5 is arranged between the retaining ring and the protrusion.

[0042] The valve core 7 adopts an advanced and reasonable pressure-balanced structural design, that is, a pressure balance hole 10 is machined on the valve core 7, and the size, quantity, position, and arrangement of the through holes are simulated and calculated in detail and accurately to reduce the unbalanced force under large pressure differences. At the same time, a sealing groove is machined on the valve core 7 for installing the soft seal ring 9. An internal threaded hole is machined at the top end position of the valve core 7 for connecting the external thread of the valve stem. A cylindrical pin 8 is installed between the valve stem 6 and the valve core 7 to prevent the thread from coming off.

[0043] Specifically, the soft seal ring 9 can be made of non-metallic materials such as PTFE and C-PTFE according to different working conditions, which can ensure that the leakage level meets the requirements of leakage rates of Class V and Class VI in the GB / T 4213 Pneumatic Control Valve Standard when sealing with the valve seat 16 under force.

[0044] The valve body provided by the present utility model is small in volume, light in weight, has few vulnerable parts, is simple to maintain, and is convenient for processing, manufacturing, installation and disassembly. When the core rod assembly moves up and down, it is guided by the guiding bush and the sleeve, with good stability. A relatively small thrust of the actuator can be used to control a large pressure difference, reducing the valve leakage rate and achieving tight closure. Moreover, a sealing groove is machined on the valve core for installing the soft seal ring.

[0045] A pressure balance type soft seal sleeve single-seat control valve provided by the present utility model

[0046] It can be matched with various domestic and foreign pneumatic diaphragm direct stroke actuators and various pneumatic piston actuators. At the same time, it can be equipped with an ordinary or intelligent electric valve positioner, directly receive the 4-20 mA DC signal sent by the computer, and the air pressure output by the valve positioner enters the actuator air chamber, making the valve operate sensitively and control accurately. At the same time, according to the actual working conditions and user requirements, it can also be equipped with any type of driving device and accessories such as a manual actuator and an electric actuator.

[0047] A pressure balance type soft seal sleeve single-seat control valve provided by the present utility model is applicable to fluid control and regulation working conditions with large pressure differences and small leakage rates in industries such as petroleum, chemical industry, and metallurgy. It meets the requirements of safety and environmental protection, can partially or completely replace similar foreign imported products, reduce the user's maintenance and repair costs, increase production capacity, and at the same time conforms to the current national encouragement policy for the localization of industrial equipment.

[0048] Through the above method, for a pressure balance type soft seal sleeve single-seat control valve provided by the present utility model, by arranging a sealing assembly composed of a packing spacer block, packing, packing gland and gland nut between the valve stem and the valve cover, the purpose of improving the stability of the valve body, enhancing the sealing performance of the valve body and extending the service life of the valve body is achieved.

[0049] The above are only the preferred embodiments of a pressure balance type soft seal sleeve single-seat control valve disclosed by the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the creative concept of the present utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the present utility model.

Claims

1. A pressure-balanced soft-sealed sleeve single-seat regulating valve, characterized in that: It comprises a valve body, a valve cover, a valve core assembly, and a sealing assembly for sealing the valve core assembly and the valve cover; The valve body is provided with a cavity for fluid circulation; The valve cover is arranged on the valve body; The valve core assembly includes a valve stem and a valve core arranged at the bottom end of the valve stem, the valve core is installed at the bottom end of the valve stem through a cylindrical pin, the bottom end of the valve stem passes through the valve cover and is placed in the cavity of the valve body, and the valve core is located at the center of the cavity; The sealing assembly is arranged in the valve cover, and the sealing assembly includes a packing pad, a packing, a packing gland and a gland nut which are sleeved on the valve stem. The packing pad, the packing gland and the gland nut are sleeved on the valve stem from bottom to top, and the packing is arranged between the packing pad and the packing gland; A disc spring is arranged between the gland nut and the packing gland; The valve body is provided with a valve seat, a sleeve and a guide sleeve in order from bottom to top; a through hole is provided at the center of the valve seat for the valve core to pass through; a winding gasket is provided between the valve seat and the valve body; A flow port communicating with the cavity is provided on the side wall of the sleeve; The guide sleeve is arranged on the top of the sleeve, and a graphite sealing gasket and a metal sealing gasket are arranged between the guide sleeve and the sleeve; A retaining ring is provided on the top of the guide sleeve, a protrusion matching with the retaining ring is provided on the side wall of the valve body where the valve body assembly is provided, the retaining ring is mounted on the protrusion, and a toothed gasket is provided between the retaining ring and the protrusion; The side wall of the valve core is provided with a soft sealing ring. When the valve core is arranged in the sleeve, the soft sealing ring is arranged closely against the valve seat, and the valve core part below the soft sealing ring passes through the through hole to realize the closing of the entire valve body; The valve core is provided with a pressure balancing hole, and the direction of the pressure balancing hole is consistent with the direction of the valve stem.

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