A convenient online maintenance low temperature top entry fixed ball valve

Abstract

A convenient online maintenance low-temperature top-mounted fixed ball valve, comprising a valve body, a valve stem arranged in the valve body, a ball connected to the valve stem, and a rear valve seat, which is floatingly connected to the valve body; a front valve seat is detachably connected to the rear valve seat, and the front valve seat and the ball are sealed and matched; an elastic component is arranged between the rear valve seat and the valve body, and the elastic component provides a pre-tightening force to make the rear valve seat fit the front valve seat; a pre-installation gap is located between the rear valve seat and the valve body, and the rear valve seat realizes the installation of the ball in the valve body by compressing the pre-installation gap and the elastic component; a fixed clamping ring is arranged on the front valve seat, and the fixed clamping ring connects the front valve seat and the rear valve seat, one end of the fixed clamping ring is fixedly connected to the front valve seat, and the other end is movably connected to the rear valve seat. The present invention makes full use of the matching gap between the elastic component and the valve seat and the valve body as an adjustment space, adjusts the ball installation space, and realizes the function of online rapid maintenance and replacement, and the secondary structure has the characteristics of short lead, light overall weight of the valve seat, flexible movement, effective protection of the sealing original, and reduced floating amount of the sealing component.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to a low-temperature top-entry fixed ball valve that is convenient for online maintenance. Background Art

[0002] The existing conventional top-mounted fixed ball valve has some disadvantages. First, it adopts a threaded structure, and the valve seat moves forward and backward through the threaded screwing. The threaded movement has the problem of thread bite and strain, especially on large-sized valves, and the effect is better on small-sized valves. Second, it adopts a ferrule fixed structure. The secondary structure is better than the thread, but the structure is complex and the valve seat is heavy. Third, it adopts an external opening to adjust the valve seat structure. The secondary structure opens multiple adjustment holes in the valve body to realize the retreat and advancement of the valve seat. There is a risk of too many leakage positions, and there are many parts. The above three structures all have a problem that the overall lead of the valve seat is very long, and the valve seat is large and heavy. Summary of the invention

[0003] In order to solve the technical defects of the prior art, the present invention provides a low-temperature top-entry fixed ball valve that can be easily maintained online.

[0004] The technical solution adopted by the present invention is: a convenient online maintenance low-temperature top-loading fixed ball valve, including a valve body, a valve stem is arranged in the valve body, a ball is connected to the valve stem, and also includes:

[0005] A rear valve seat, wherein the rear valve seat is floatingly connected to the valve body;

[0006] A front valve seat, the front valve seat is detachably connected to the rear valve seat, and the front valve seat is in sealing cooperation with the ball;

[0007] An elastic component, which is arranged between the rear valve seat and the valve body, and provides a pre-tightening force to make the rear valve seat fit the front valve seat;

[0008] A pre-installation gap, wherein the pre-installation gap is located between the rear valve seat and the valve body, and the rear valve seat realizes the installation of the ball in the valve body by compressing the pre-installation gap and the elastic component;

[0009] A fixed clamp ring is arranged on the front valve seat, the fixed clamp ring connects the front valve seat and the rear valve seat, one end of the fixed clamp ring is fixedly connected to the front valve seat, and the other end is movably connected to the rear valve seat.

[0010] A valve seat sealing groove is provided on the connecting surface between the rear valve seat and the front valve seat, a plug-in portion adapted to the valve seat sealing groove is provided on the front valve seat, and the front valve seat and the rear valve seat are plug-fitted between the plug-in portion and the valve seat sealing groove.

[0011] A sealing member is also arranged in the valve seat sealing groove.

[0012] A retaining groove is also formed on one side of the rear valve seat in the valve body. The retaining groove cooperates with the positioning pin to move the front valve seat and the rear valve seat backward to keep the elastic component compressed and the rear valve seat in a fitting state with the valve body.

[0013] A semicircular positioning platform is also provided on the rear valve seat, and the front valve seat and the semicircular positioning platform are limitedly matched to ensure that the front valve seat and the rear valve seat are aligned.

[0014] One end of the fixed clamp ring is fixed on the front valve seat through a fastener.

[0015] The rear valve seat is provided with a groove, and the other end of the fixed clamp ring is movably connected to the groove.

[0016] The other end of the fixed clamp ring is formed with a hook structure, and the hook structure is movably connected to the groove. The hook structure is the fixed end, and the rear valve seat and the groove are the movable ends.

[0017] The hook-shaped structure is provided with a forward clearance to ensure that the rear valve seat can freely move toward the front valve seat and compress the sealing member in the middle.

[0018] The sealing element is a double-groove sealing structure made of graphite sealing gasket and PCTFE material.

[0019] The beneficial effects of the present invention are as follows: the present invention provides a convenient online maintenance low-temperature top-loading fixed ball valve, comprising a valve body, a valve stem is arranged in the valve body, a ball is connected to the valve stem, and a rear valve seat is also included, and the rear valve seat is floatingly connected to the valve body; the front valve seat is detachably connected to the rear valve seat, and the front valve seat and the ball are sealed and matched; the elastic component is arranged between the rear valve seat and the valve body, and the elastic component provides a pre-tightening force to make the rear valve seat fit the front valve seat; the pre-installation gap is located between the rear valve seat and the valve body, and the rear valve seat realizes the installation of the ball in the valve body by compressing the pre-installation gap and the elastic component; the fixing clamp ring is arranged on the front valve seat, and the fixing clamp ring connects the front valve seat and the rear valve seat, one end of the fixing clamp ring is fixedly connected to the front valve seat, and the other end is movably connected to the rear valve seat, the present invention makes full use of the matching gap between the elastic component and the valve seat and the valve body as an adjustment space, adjusts the ball installation space, and realizes the function of online rapid maintenance and replacement, and the secondary structure has the characteristics of short lead, light overall weight of the valve seat, flexible movement, effective protection of the sealing original, and reduction of the floating amount of the sealing component. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the connection structure between the front valve seat and the rear valve seat of the present invention.

[0022] Figure 3It is a schematic diagram of the structure of the present invention.

[0023] Figure 4 It is a schematic diagram of the structure of the present invention.

[0024] Figure 5 This is a schematic diagram of the quick installation of the ball and valve seat of the present invention.

[0025] Among them, 1-valve body, 2-valve stem, 3-ball, 4-rear valve seat, 5-front valve seat, 6-elastic component, 7-pre-installation gap, 8-fixing clamping ring, 9-locating pin, 41-valve seat sealing groove, 42-positioning groove, 43-semicircular positioning platform, 44-groove, 81-hook structure, 82-forward gap. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] A convenient online maintenance low-temperature top-loading fixed ball valve comprises a valve body 1, wherein a valve stem 2 is arranged in the valve body 1, a ball 3 is connected to the valve stem 2, and a rear valve seat 4 is also included, wherein the rear valve seat 4 is floatingly connected to the valve body 1; a front valve seat 5, wherein the front valve seat 5 is detachably connected to the rear valve seat 4, and the front valve seat 5 and the ball 3 are sealed together; an elastic component 6, wherein the elastic component 6 is arranged between the rear valve seat 4 and the valve body 1, and the elastic component 6 provides a pre-tightening force to make the rear valve seat 4 fit the front valve seat 5; a pre-installation gap 7, wherein the pre-installation gap 7 is located between the rear valve seat 4 and the valve body 1, and the rear valve seat 4 realizes the installation of the ball 3 in the valve body 1 by compressing the pre-installation gap 7 and the elastic component 6; a fixing snap ring 8, wherein the fixing snap ring 8 is arranged on the front valve seat 5, wherein the fixing snap ring 8 connects the front valve seat 5 and the rear valve seat 4, wherein one end of the fixing snap ring 8 is fixedly connected to the front valve seat 5, and the other end is movably connected to the rear valve seat 4. A valve seat sealing groove 41 is provided on the connection surface between the rear valve seat 4 and the front valve seat 5, and a plug-in portion adapted to the valve seat sealing groove 41 is provided on the front valve seat 5. The front valve seat 5 and the rear valve seat 4 are plugged and matched between the plug-in portion and the valve seat sealing groove 41. A sealing member is also provided in the valve seat sealing groove 41. The sealing member is a double groove 44 sealing structure made of a graphite sealing gasket and a PCTFE material. The double groove sealing structure is adopted to form a labyrinth sealing effect. The first seal adopts a graphite sealing gasket, and the second seal adopts a PCTFE material to ensure the sealing of the valve seat position connection. The secondary structure can achieve a self-sealing effect. The higher the pressure behind the valve seat, the better the sealing effect. A clamping groove 42 is also formed on one side of the rear valve seat 4 in the valve body 1. The clamping groove 42 cooperates with the positioning pin 9 to move the front valve seat 5 and the rear valve seat 4 backward to keep the elastic component 6 compressed and the rear valve seat 4 and the valve body 1 in a fitting state.

[0028] A semicircular positioning platform 43 is also provided on the rear valve seat 4, and the front valve seat 5 and the semicircular positioning platform 43 are limitedly matched to ensure that the front valve seat 5 is aligned with the rear valve seat 4. When the spherical valve seat is placed in the valve body as a whole, the positioning platform ensures that the front valve seat and the rear valve seat are aligned, so that the front valve seat is inserted into the valve seat sealing groove of the rear valve seat.

[0029] One end of the fixed snap ring 8 is fixed to the front valve seat 5 by a screw. The screw has a loosening structure, and a groove 44 is provided on the rear valve seat 4. The other end of the fixed snap ring 8 is movably connected to the groove 44. A hook structure 81 is formed on the other end of the fixed snap ring 8, and the hook structure 81 is movably connected to the groove 44. The hook structure 81 is a fixed end, and the rear valve seat 4 and the groove 44 are movable ends. The hook structure 81 is formed with a forward clearance 82 to ensure that the rear valve seat 4 can move freely toward the front valve seat 5 to compress the seal in the middle. The purpose of the movable connection is to ensure that the rear valve seat can move freely forward to compress the seal in the middle to ensure sealing. The lack of a retreat clearance between the snap ring and the rear valve seat is mainly to prevent the front and rear valve seats from detaching, because the valve may have an internal cavity pressure higher than the inlet end due to the accumulated pressure in the internal cavity, and the medium pushes the valve seat back.

[0030] When the top-entry fixed ball valve of the present invention is installed and disassembled online, Figure 5 As shown, first install the rear valve seat, seal and spring into the valve body respectively to ensure the installation space of the ball. After the rear valve seat reaches the position, there are slots on both sides of the valve seat. Put the positioning pins into the slots to fix the valve seat so that the rear valve seat maintains the current position. Then use a special installation tool to fit the front valve seat and the ball and ensure that the valve seat is concentric with the flow channel. In this way, the ball and the front valve seat are connected as one. The ball and the front valve seat are placed in the valve body as a whole. The rear valve seat is designed with a bottom semicircular positioning platform. When the ball and the front valve seat are placed in the valve body as a whole, the positioning platform is used to ensure that the front valve seat and the rear valve seat are aligned, so that the front valve seat is inserted into the valve seat sealing groove. After installation, remove the fixing bracket to allow the ball and the valve seat to detach from the valve seat and move freely, and adjust the front valve seat and the rear valve seat to insert into the groove accordingly. Then remove the positioning pin to allow the rear valve seat to fit with the front valve seat through the spring component on the rear valve seat, thereby compressing the middle seal and allowing the front valve seat and the ball to produce an initial pre-tightening pressure to achieve a sealing effect. After installation, rotate the ball to check the relative position of the valve seat and the ball to ensure there is no interference or misalignment. After confirming that it is qualified, install the fixed connecting clamp above.

[0031] When disassembling online, first push the valve seats on both sides outwards and use our positioning pins to position and lock the valve seats to ensure space for the ball to be removed. Then use our special tools to fix the ball and the front valve seat together and lift the whole from the valve body. Then disassemble the valve seat, and finally realize the function of online rapid maintenance and replacement.

[0032] Technical personnel should note that although the present invention has been described according to the above specific implementation methods, the inventive concept of the present invention is not limited to this invention, and any modification using the inventive concept will be included in the scope of protection of this patent.

[0033] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A low-temperature top-entry fixed ball valve with convenient online maintenance, comprising a valve body (1), wherein a valve stem (2) is arranged in the valve body (1), and a ball (3) is connected to the valve stem (2), characterized in that: Also includes: A rear valve seat (4), wherein the rear valve seat (4) is floatingly connected to the valve body (1); A front valve seat (5), wherein the front valve seat (5) is detachably connected to the rear valve seat (4), and the front valve seat (5) and the ball (3) are in sealing cooperation; An elastic component (6), wherein the elastic component (6) is arranged between the rear valve seat (4) and the valve body (1), and the elastic component (6) provides a pre-tightening force to make the rear valve seat (4) fit the front valve seat (5); A pre-installation gap (7), wherein the pre-installation gap (7) is located between the rear valve seat (4) and the valve body (1), and the rear valve seat (4) achieves installation of the ball (3) in the valve body (1) by compressing the pre-installation gap (7) and the elastic component (6); a fixed clamp ring (8), the fixed clamp ring (8) being arranged on the front valve seat (5), the fixed clamp ring (8) connecting the front valve seat (5) and the rear valve seat (4), one end of the fixed clamp ring (8) being fixedly connected to the front valve seat (5), and the other end of the fixed clamp ring (8) being movably connected to the rear valve seat (4); A valve seat sealing groove (41) is provided on the connecting surface between the rear valve seat (4) and the front valve seat (5); a plug-in portion adapted to the valve seat sealing groove (41) is provided on the front valve seat (5); the front valve seat (5) and the rear valve seat (4) are plug-fitted between the plug-in portion and the valve seat sealing groove (41); A sealing member is also provided in the valve seat sealing groove (41); one end of the fixing clamp (8) is fixed to the front valve seat (5) by a fastener; a groove (44) is provided on the rear valve seat (4); the other end of the fixing clamp (8) is movably connected to the groove (44); a hook-shaped structure (81) is formed on the other end of the fixing clamp (8); the hook-shaped structure (81) is movably connected to the groove (44); the hook-shaped structure (81) is a fixed end; the rear valve seat (4) and the groove (44) are movable ends; a forward clearance (82) is formed on the hook-shaped structure (81) to ensure that the rear valve seat (4) can move freely toward the front valve seat (5) to compress the sealing member in the middle.

2. A convenient online maintenance low temperature top entry fixed ball valve according to claim 1, characterized in that: A retaining groove (42) is also formed on one side of the rear valve seat (4) in the valve body (1), and the retaining groove (42) cooperates with the positioning pin (9) to move the front valve seat (5) and the rear valve seat (4) backward to maintain the compression of the elastic component (6) and the fitting state of the rear valve seat (4) and the valve body (1).

3. The convenient online maintenance low temperature top entry fixed ball valve according to claim 1 is characterized in that: A semicircular positioning platform (43) is also provided on the rear valve seat (4), and the front valve seat (5) and the semicircular positioning platform (43) are limitedly matched to ensure that the front valve seat (5) and the rear valve seat (4) are aligned.

4. The convenient online maintenance low temperature top entry fixed ball valve according to claim 1 is characterized in that: The sealing element is a double groove (44) sealing structure made of graphite sealing gasket and PCTFE material.

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