Multi-functional dual seal valve assembly

Abstract

This invention discloses a multifunctional double-sealing valve assembly, comprising two circular orifice sealing surfaces. These two circular orifice sealing surfaces are connected in series to form a double-sealing valve. The axes of the two circular orifice sealing surfaces are orthogonal to the axes of the valve inlet and outlet. The included angle between the axes of the two circular orifice sealing surfaces is the same axis, orthogonal, or oblique, and they are located in the same plane. Each circular orifice sealing surface has an independent opening and closing system; closing either system achieves a seal, and closing both achieves redundant sealing. Compared to a single sealing surface in a standard valve, the reliability of this invention, employing two independent, series-connected double sealing pairs, is significantly improved, meeting the sealing requirements of harsh operating conditions.

Description

Technical Field

[0001] This invention belongs to the field of valve design and manufacturing, specifically involving two gate valves, two check valves, two gate check valves, and a double-sealed valve with different combinations. Technical Background

[0002] Existing gate valves and check valves are generally designed as a single sealing pair according to valve standards. However, valve assemblies used in chemical control valve groups, process pump valve groups, and inlet / outlet devices under harsh operating conditions typically combine two or more different types of individual standard valves and fittings to ensure sealing reliability and meet sewage and venting process requirements. This results in larger installation space and a greater number of welds (see...). Figure 1 The existing double-seal gate valve CN2352767Y, a double-disc gate valve CN204175997V, and a new triple-seal anti-erosion gate valve CN108561572A all use a single operating system with double seals. However, the seal formed by the main and auxiliary valve discs is a parallel sealing surface, which is not very reliable and does not meet the requirements of low inlet and high outlet in process pipelines. These valves cannot be installed in harsh operating conditions with only one valve to ensure the reliability of the seal. Summary of the Invention

[0003] The purpose of this invention is to provide a multifunctional double-sealing valve assembly that improves sealing reliability and extends service life.

[0004] The technical solution of this invention is:

[0005] A multifunctional double-sealing valve assembly includes a circular orifice sealing surface. The valve assembly has two circular orifice sealing surfaces connected in series to form a double-sealing valve. The axes of the two circular orifice sealing surfaces are orthogonal to the axes of the valve inlet and outlet. The included angle between the axes of the two circular orifice sealing surfaces is the same axis, orthogonal, or oblique, and they are located in the same plane. Each circular orifice sealing surface has an independent opening and closing system; closing either system achieves sealing, and closing both achieves redundant sealing.

[0006] Double-sealed valves can be configured with different valve covers, valve stems, and valve discs to form double-stop valves, double-check valves, double-stop check valves, or a combination of stop valve and check valve.

[0007] The same double-stop check valve can achieve three different functions—double stop, double check, and one stop plus one check—by adjusting the position of the valve stem.

[0008] A drain valve is installed between the two sealing surfaces, and the flange has a built-in process interface. Under the installation conditions of standardized valves, it meets the requirements of high reliability, multi-functionality and low cost in harsh working conditions.

[0009] The length of the double-sealed valve is the same as that of the standard single-sealed valve of the same model.

[0010] The present invention has the following advantages:

[0011] Two independent, tandem double sealing pairs offer significantly improved reliability compared to a single sealing pair in a standard valve, meeting the sealing requirements of demanding operating conditions.

[0012] With the same double-sealing surface valve body, different valve covers, valve stems, and valve discs can form a variety of multifunctional double-sealing valves, including double shut-off valves, double check valves, double shut-off check valves, and shut-off valves plus check valves.

[0013] The same double shut-off check valve can achieve three different functions—double shut-off, double check, and one shut-off plus one check—by adjusting the position of the valve stem.

[0014] According to pipeline process requirements, a discharge valve can be installed between the two sealing surfaces of any type of double-sealed valve, and a process interface can be installed on the flange.

[0015] The length of the double-seal valve is the same as that of the standard single-seal valve of the same model, thus meeting the requirements of reliable double sealing and multiple functions, while also saving space, having a high degree of standardization, and being easy to apply.

[0016] Modular integrated double-sealed valve groups with built-in process interfaces on flanges require one less tee and drainage space during welding and installation compared to single valve groups with the same function. This significantly reduces the cost of welds, weld inspection, and post-weld heat treatment. It also shortens the construction cycle, increases efficiency, saves installation costs, reduces weld stress corrosion, lowers safety hazards, and extends service life. It has significant technical and economic benefits and promising prospects for widespread application. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of the installation principle of a conventional control valve assembly using a single valve.

[0019] Where: A is a standard double valve assembly; B is a double valve assembly with a vent valve; C is a double valve assembly with a discharge port; d is a weld; f is a reinforced pipe joint (2 welds) or a reducing tee (3 welds); g is a tee.

[0020] Figure 2 This is a structural diagram of a double-sealed shut-off valve assembly.

[0021] Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure.

[0022] Figure 4 This is a structural diagram of a multifunctional double-sealed shut-off check valve assembly.

[0023] Figure 5 yes Figure 4 A schematic diagram of the cross-sectional structure.

[0024] Figure 6 This is a structural diagram of a double-sealed check valve assembly.

[0025] Figure 7 for Figure 6 A schematic diagram of the cross-sectional structure.

[0026] Figure 8 This is a structural diagram of a multifunctional double-sealed valve with a discharge system.

[0027] Figure 9 for Figure 8 A schematic diagram of the cross-sectional structure.

[0028] Figure 10 This is a structural diagram of a valve assembly consisting of a gate valve and a check valve, or a gate check valve and a check valve.

[0029] Figure 11 This is a cross-sectional structural diagram of a gate valve and check valve assembly.

[0030] Figure 12 This is a cross-sectional schematic diagram of a stop check valve and a check valve assembly.

[0031] Figure 13 This is an external view of a double-seal valve with a flange and interface.

[0032] Figure 14 for Figure 13 A schematic diagram of the cross-sectional structure. Detailed Implementation

[0033] Reference Figure 1 Taking the installation principle diagram of a conventional control valve group using a single valve as an example, Figure A shows a common double valve group using two single valves in a bypass system; Figure B shows a discharge system consisting of two single valves and one discharge valve; and Figure C shows a double valve group with discharge used for isolation before the control valve. As can be seen from the figures, to reliably achieve the isolation, bypass, and discharge functions of the control valve group, numerous individual valves and fittings such as tees need to be assembled and welded together. This results in problems such as large installation space, numerous welds, long construction period, and high costs for weld inspection and heat treatment.

[0034] Reference Figure 2 , Figure 3 ,against Figure 1The problem is that a multifunctional double-sealed shut-off check valve and shut-off check valve assembly solution exists. The valve body 1 has an inlet end hole E and an outlet end hole O. Between the inlet and outlet, the valve stem is in a vertical position. The sealing surface opening and closing system V (composed of handwheel V1, valve stem V2, valve disc V3, valve body sealing surface circular hole V4, valve cover V5, valve stem nut V6, gasket G1, etc.) is in a vertical position. The valve disc V3 mates with the hole in the valve body 1. The T-slot on the valve disc V3 mates with the T-head of the valve stem V2. The valve stem V2 is fixed to the handwheel V1 and mates with the fixed valve stem nut V6. Rotating the handwheel V1... The valve stem V2 drives the valve disc V3 to move up and down, thus opening and closing the valve body sealing hole V4. The valve stem is in a horizontal position. The sealing surface opening and closing system H (comprising handwheel H1, valve stem H2, valve disc H3, valve body sealing hole H4, valve cover H5, valve stem nut H6, gasket G1, etc.) is in operation. The valve disc H3 mates with the hole in the valve body 1. The T-slot on the valve disc H3 mates with the T-head of the valve stem H2. The valve stem H2 is fixed to the handwheel H1 and mates with the fixed valve stem nut H6. Rotating the handwheel H1 causes the valve stem H2 to drive the valve disc H3 to move up and down, thus opening and closing the valve body sealing hole H4. A double-sealed valve is formed by connecting a vertical sealing orifice V4 and a horizontal sealing orifice H4 in series and placing them between the inlet and outlet orifices. The axes of the orifices V4 and H4 are orthogonal to the axis connecting the valve body inlet and outlet, and are located on the symmetrical plane of the valve body inlet and outlet end faces. The length between the inlet and outlet end faces of the double-sealed valve formed by this geometric relationship is the same as the length of the standard single-sealed valve of the same model. This satisfies the requirements for double reliable sealing, saves space, has a high degree of standardization, and is easy to apply.

[0035] Reference Figure 4 , Figure 5 ,Will Figure 3 In the vertical position sealing surface opening and closing system V, the valve stem V2 and valve disc V3 are changed to Figure 3 The valve body is designed with V22 and V32, and a spring S1 is added. Valve disc V32 can slide within the bore of the valve body and the cylindrical valve stem V22. Spring S1 is installed within the gap between valve stem V22 and valve disc V32. When closed, rotating handwheel V1 forward causes valve stem V22 to seal valve disc V32 against sealing bore V4. When open, rotating handwheel V1 in the reverse direction disengages valve stem V22 from valve disc V32. Under the action of the medium, valve disc V32 overcomes its own weight and the force of spring S1 to open. When the medium flows in the reverse direction, valve disc V32 automatically closes due to its own weight and spring force. Figure 3 In the horizontal position sealing surface opening and closing system H, the valve stem H2 and valve disc H3 are changed to Figure 5The valve body is designed with H22 and H32, and a spring S1 is added. Valve disc H32 can slide within the bore of the valve body and the cylindrical valve stem H22. Spring S1 is installed within the gap between valve stem H22 and valve disc H32. When closing, rotating handwheel H1 forward causes valve stem H22 to seal valve disc H32 against sealing hole H4. When opening, rotating handwheel H1 in the reverse direction disengages valve stem H22 from valve disc H32. Under the action of the medium, valve disc H32 overcomes the force of spring S1 to open. When the medium flows in the reverse direction, valve disc H32 automatically closes due to spring force. By simply replacing valve assembly parts, a double shut-off valve can be converted into a double shut-off check valve. Figure 2 The valve stem and valve disc in any one of the vertical or horizontal sealing surface opening and closing systems are changed to Figure 4 The structure consists of a dual valve assembly with a stop valve and a stop check valve connected in series, which facilitates obtaining the required multiple functions.

[0036] Reference Figure 6 , Figure 7 ,right Figure 5 The only parts retained are the valve body 1, the vertical and horizontal valve discs V32 and H32, the spring S1, and the gasket G1. Other parts are removed, and the valve covers V8 and H8 for the vertical and horizontal check valves and the corresponding studs and nuts are installed to form a double-sealed check valve structure.

[0037] Reference Figure 8 , Figure 9 When the medium between the sealing surfaces of the two valves needs to be discharged, Figure 2 or Figure 5 A discharge valve system P (comprising a handwheel P1, an integral valve stem and valve disc P2, a valve cover P3, a valve body sealing surface hole P4, packing P5, a packing gland P6, etc.) is added between the sealing surface hole V4 and the valve body sealing surface hole H4 of the valve body 1. The valve cover P3 has a thread M1 for connecting to the valve body 1, a thread M2 for connecting to the valve stem P2, and a thread M6 for connecting to the packing gland P6. Tightening the valve cover allows the connecting conical surface of the valve cover P3 to engage with the valve body 1 to achieve a seal. Tightening the packing gland P6 compresses the packing P5 to seal the valve stem P2. Rotating the handwheel P1 in the forward direction causes the valve stem P2 to move axially, allowing the conical surface of the valve stem head to engage with the sealing hole P4 for a seal. Rotating the handwheel in the reverse direction causes the conical surface of the valve stem head to move away from the sealing hole P4, and the medium flows out through the hole P4 and the discharge hole NP4 and the discharge pipe hole NP5.

[0038] Reference Figure 11 , 12 ,right Figure 2 and Figure 5 Replace one of the opening and closing systems of the double-sealed shut-off valve and the double-sealed shut-off check valve with Figure 7 A check valve consists of a set of parts including the valve cover, valve disc, and spring. Figure 11 , Figure 12A dual valve assembly consisting of a stop valve and a check valve, or a stop valve and a check valve.

[0039] Reference Figure 13 , Figure 14 In order to achieve Figure 1 The function shown in C is to add a round boss J1 to the thinner flange of the valve body (not needed for thicker flanges), and drill a small hole J2 and thread J3 in the center of the round boss to connect to process pipe fittings for sampling pressure testing and gas and liquid discharge. This reduces the need for special pipe fittings (such as reducing tees) to achieve this function, reduces the discharge space, and reduces welding and construction inspection costs.

[0040] The illustrated connection method of the multifunctional double-sealed shut-off valve check valve and shut-off check valve assembly is one end flange and one end welded. It can be processed into two-end welded as required, or it can be manufactured into two-end flange connection as required.

[0041] The illustration of the multifunctional double-sealed shut-off valve check valve and shut-off check valve assembly shows a small forged steel manual valve structure, but it can also be a larger casting structure or other operating structures such as pneumatic or electric.

[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make slight modifications or changes to equivalent embodiments based on the disclosed technical solutions without departing from the scope of the present invention. Any simple modifications, equivalent substitutions, and improvements made to the above embodiments within the spirit and principles of the present invention, without departing from the scope of the present invention, shall still fall within the protection scope of the present invention.

Claims

1. A multifunctional double-sealing valve assembly, comprising two circular orifice sealing surfaces, characterized in that: The valve assembly has two circular hole sealing surfaces, which are connected in series to form a double-sealed valve. The axes of the two circular hole sealing surfaces are orthogonal to the axis connecting the valve body inlet and outlet. The included angles of the axes of the two circular hole sealing surfaces are orthogonal or oblique, and they are in the same plane. Each circular hole sealing surface has an independent opening and closing system. Closing either system can achieve sealing, and closing both systems achieves redundant sealing. Double-sealed valves can be configured with different valve covers, valve stems, and valve discs to form double-stop valves, stop valves plus stop check valves, or stop valves plus check valves. By adjusting the position of the valve stem, a double shut-off valve or a single shut-off valve plus a check valve can be added to the same shut-off valve to achieve two different functions: double shut-off and single shut-off valve plus check valve. A drain valve is installed between the two sealing surfaces, and the flange has a built-in process interface; Specific valve assembly structures include the following forms: First, there is a system for opening and closing the valve stem with the sealing surface in a vertical position between the inlet and outlet holes of the valve body; the system for opening and closing the valve stem with the sealing surface in a vertical position includes a first handwheel, a first valve stem, a first valve disc, a circular hole in the sealing surface of the first valve body, a first valve cover, a first valve stem nut, and a first gasket; the first valve disc mates with the hole in the valve body, the T-slot on the first valve disc mates with the T-head of the first valve stem, the first valve stem is fixed to the first handwheel and mates with the fixed first valve stem nut, rotating the first handwheel causes the first valve stem to drive the first valve disc to move up and down to achieve opening and closing with the sealing circular hole of the first valve body; A system with a valve stem in a horizontal position for opening and closing of the sealing surface; the system includes a second handwheel, a second valve stem, a second valve disc, a second valve body sealing surface hole, a second valve cover, a second valve stem nut, and a second gasket; the second valve disc mates with the hole in the valve body, the T-slot on the second valve disc mates with the T-head of the second valve stem, the second valve stem is fixed to the second handwheel and mates with the fixed second valve stem nut, rotating the second handwheel causes the second valve stem to drive the second valve disc to move horizontally to achieve opening and closing with the sealing surface hole of the second valve body; The first valve body sealing surface circular hole and the second valve body sealing surface circular hole are connected in series and located between the inlet hole and the outlet hole to form a double sealing valve. The axis of the first valve body sealing surface circular hole and the axis of the second valve body sealing surface circular hole are orthogonal to the axis formed by the valve body inlet and outlet, and are located on the symmetrical plane of the valve body inlet and outlet ends. Second, between the inlet and outlet holes of the valve body, there is a system for opening and closing the sealing surface with the valve stem in a vertical position; the system for opening and closing the sealing surface with the valve stem in a vertical position includes a first valve disc, which can slide within the hole of the valve body and the cylinder of the first valve stem, and a first spring is installed in the gap between the first valve stem and the first valve disc. When closed, rotating the first handwheel in the forward direction allows the first valve stem to seal the first valve disc with the sealing hole of the first valve body. When opened, rotating the first handwheel in the reverse direction disengages the first valve stem from the first valve disc. Under the action of the medium, the first valve disc overcomes its own weight and the force of the first spring to open. When the medium flows in the reverse direction, the first valve disc closes automatically by its own weight and the force of the spring. The system for opening and closing the sealing surface of the valve stem in a horizontal position includes a second handwheel, a second valve stem, a second valve disc, a circular hole in the sealing surface of the second valve body, a second valve cover, a second valve stem nut, and a second gasket. The second valve disc mates with the hole in the valve body, and the T-slot on the second valve disc mates with the T-head of the second valve stem. The second valve stem is fixed to the second handwheel and mates with the fixed second valve stem nut. Rotating the second handwheel causes the second valve stem to drive the second valve disc to move horizontally, thereby opening and closing the sealing circular hole in the second valve body. The discharge valve includes a third handwheel, a third valve stem, a third valve cover, a circular hole on the sealing surface of the third valve body, packing, and a packing gland. The third valve cover has threads for connecting to the valve body, threads for connecting to the third valve stem, and threads for connecting to the packing gland. Tightening the third valve cover allows the connecting conical surfaces of the third valve cover and the valve body to engage and seal. Tightening the packing gland compresses the packing and seals the third valve stem. Rotating the third handwheel in the forward direction drives the third valve stem to move axially, causing the conical surface of the third valve stem head to engage and seal with the circular hole on the sealing surface of the third valve body. Rotating the third handwheel in the reverse direction causes the conical surface of the third valve stem head to leave the circular hole on the sealing surface of the third valve body, and the medium flows out through the circular hole on the sealing surface of the third valve body, the discharge hole, and the discharge pipe hole.

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