Portable cast steel knife-shaped gate valve and assembling method thereof

Abstract

The invention discloses a convenient cast steel knife-shaped gate valve and an assembling method thereof, the convenient cast steel knife-shaped gate valve comprises a valve body used for communicating pipelines on two sides, and sealing assemblies are symmetrically mounted in the valve body close to the middle and used for performing contact sealing between the valve body and a valve clack. According to the knife type gate valve, the sealing assemblies are symmetrically arranged on the two sides of the valve clack, so that the two sides of the valve clack can be extruded and sealed when the valve clack is closed, the sealing cut-off sealing effect of the knife type gate valve is improved, meanwhile, the protection base is arranged at the inner bottom of the valve body, and therefore the protection base can abut against and fix the sealing assemblies on the two sides when the sealing assemblies are installed; the structure is simple, the stability in the using process is improved, the bottom of the valve clack which rapidly descends to be closed can be borne and protected, the valve clack is prevented from impacting and abrading the interior of the valve body, the service life of the valve body is prolonged, the elastic sealing sleeve is arranged in the stuffing box, the adaptability when internal stuffing is pressed is guaranteed, and then the sealing effect of the stuffing box is improved.

Description

Technical Field

[0001] The invention relates to the technical field of gate valve application, in particular to a portable cast steel knife-type gate valve and an assembly method thereof. Background Art

[0002] Knife-type gate valve is a valve with a specific structure and function, which is mainly used to control the circulation and opening and closing of fluid. The opening and closing parts of knife-type gate valve are gate plates, and the movement direction of the gate plates is perpendicular to the direction of fluid. The gate plates are usually made of austenitic stainless steel, which greatly improves the corrosion resistance and can effectively prevent seal leakage caused by gate plate corrosion.

[0003] When the existing knife-type gate valve is in use, when the valve disc moves inside the valve body, it generally uses a sealing ring for hard sealing, which will cause wear during long-term use, reduce the sealing effect, and further cause valve body leakage, increase the maintenance cost of the valve body, and when the valve disc is quickly raised and lowered, the valve disc will cause a certain collision with the inner bottom of the valve body, thereby damaging the valve body and reducing the service life of the entire gate valve. Therefore, the present invention proposes a convenient cast steel knife-type gate valve and an assembly method thereof. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a convenient cast steel knife-type gate valve and an assembly method thereof. By symmetrically arranging sealing components on both sides of the valve disc, it is possible to perform extrusion sealing on both sides of the valve disc when it is closed, thereby improving the sealing and cutting sealing effect of the knife-type gate valve. At the same time, a protective seat is arranged on the inner bottom of the valve body, so that it can not only tightly fix the sealing components on both sides during installation, thereby improving the stability during use, but also can receive and protect the bottom of the valve disc that is quickly lowered and closed, thereby preventing the valve disc from causing impact and wear on the inside of the valve body, thereby improving the service life of the valve body, and arranging an elastic sealing sleeve in the stuffing box to ensure the adaptability of the internal stuffing when it is compressed, thereby improving the sealing effect at the stuffing box.

[0005] In order to solve the above technical problems, a technical solution adopted by the present invention is: to provide a convenient cast steel knife-type gate valve, including a valve body, which is used to connect the pipelines on both sides, the sealing assembly is symmetrically installed near the middle position inside the valve body, and is used to contact and seal between the valve body and the valve disc, the protective seat is threadedly connected to the center of the inner bottom of the valve body, and is used to press the sealing assemblies on both sides, the valve disc is slidably connected to the inner wall of the valve body, and is used to cut off and seal the inner cavity of the valve body, the valve stem is movably connected to the top of the valve disc, and is used to drive the valve disc to move up and down inside the valve body, the threaded rod is fixedly connected to the top of the valve stem, and is used to drive the valve stem to move up and down, the bracket is connected to the top of the valve body by a plurality of bolts, and is sleeved on the outside of the valve stem and the threaded rod, and is used to keep the valve stem and the threaded rod stable, the packing assembly is sleeved on the outer wall of the valve stem near the top position, and is tightly fitted to the inner wall of the bracket, and is used to seal the lifting and lowering movable position of the valve stem, and the manual assembly is detachably installed on the top of the bracket, and is used to drive the threaded rod to move up and down.

[0006] The present invention is further configured as follows: the sealing assembly includes a mounting ring, the mounting ring is installed inside a mounting groove arranged on a valve seat in the valve body, the inner wall of the mounting ring is snap-connected with a retaining ring, the retaining ring is embedded in the groove opened on the inner wall of the mounting ring through a clamping block arranged on its outer wall, and the opposing surfaces of the retaining ring and the valve disc are serrated.

[0007] Through the above technical scheme, the retaining ring is mounted on the inner wall of the mounting ring by means of a clamping block arranged on the outer wall of the retaining ring, and the side wall of the mounting ring is wrapped and fixed, thereby improving the sealing effect between the valve body and the valve disc, and a serration is arranged on the contact side of the valve disc, so that when the valve disc is squeezed against the sealing component, it can improve the sealing during squeezing.

[0008] The present invention is further configured as follows: a sealing groove is provided inside the valve body near the mounting groove, and a sealing ring is snap-connected inside the sealing groove and is tightly arranged against one side of the retaining ring.

[0009] Through the above technical solution, the sealing ring can be used to squeeze and seal the connection between the sealing component and the installation groove, thereby improving the sealing effect of the valve body during use.

[0010] The present invention is further configured as follows: the protective seat includes an arc block, the top of the arc block is symmetrically fixedly connected with a protective extrusion block near the end surface, the middle of the arc block is penetrated by a mounting stud, and the mounting stud is threadedly connected to the inner bottom of the valve body, and the two side walls of the arc block are symmetrically fixedly connected with positioning columns away from the middle position, the outer walls of the two groups of the positioning columns are threadedly connected with rotating nuts, and the end faces of the rotating nuts are fixedly connected with tightening caps, and the end faces of the two groups of the tightening caps are respectively pressed against the opposite surfaces of the sealing components on both sides.

[0011] Through the above technical solution, the protective seat is threadedly connected to the inner bottom of the valve body through the installation studs, and multiple rotating nuts are rotated at the same time, so that the locking caps on the end faces can lock the sealing assemblies on both sides, so that the sealing assemblies are stably fixed inside the installation groove.

[0012] The present invention is further configured as follows: a receiving groove is provided at the bottom of the valve disc and is pressed against the tops of the two protective extrusion blocks; sliding grooves are symmetrically provided on the side walls of the valve disc and are slidably connected to sliding rails provided at corresponding positions of the sliding grooves inside the valve body through the sliding grooves.

[0013] Through the above technical solution, the valve flap can be pressed against the protective extrusion block after it descends, thereby avoiding collision and wear between the valve flap and the valve body, and under the action of the slide rail, the valve flap can be stably lifted and lowered inside the valve body.

[0014] The present invention is further configured as follows: a T-shaped connecting groove is opened on the top of the valve disc, a T-shaped connecting block is arranged at the bottom of the valve stem, and is snap-connected to the T-shaped connecting groove through the T-shaped connecting block, and a sealing cone surface is arranged on the outer wall of the valve stem near the bottom.

[0015] The above technical solution facilitates the rapid connection and fixation of the valve stem and the valve disc, and the provided sealing cone surface can be squeezed and sealed with the bottom of the limiting sealing sleeve after rising.

[0016] The present invention is further configured as follows: the packing assembly comprises a limit sealing sleeve threadedly connected to the inner wall of the bracket near the bottom, a sealing wiper sleeve is arranged at the top position of the inner wall of the limit sealing sleeve, and the inner wall of the sealing wiper sleeve is fixedly connected with a plurality of wiper parts that fit the outer wall of the valve stem, a packing A is arranged on the top of the limit sealing sleeve, an elastic sealing sleeve is tightly arranged on the top of the packing A, a packing B is tightly arranged on the top of the elastic sealing sleeve, a pressing sleeve is pressed on the top of the packing B, a pressing frame is pressed on the top of the pressing sleeve, tensioning pieces are symmetrically penetrated at both ends of the pressing frame, and the bottoms of the two tensioning pieces are respectively mounted on the side walls of the bracket by bolts; The position-limiting sealing sleeve, the sealing wiper sleeve, the packing A, the elastic sealing sleeve, the packing B, the pressing sleeve and the pressing frame are sequentially fitted and sleeved on the outer wall of the valve stem.

[0017] Through the above technical scheme, the sealing wiper sleeve, packing A, elastic sealing sleeve, packing B, pressing sleeve and pressing frame are sequentially sleeved on the outer wall of the valve stem, and the nut on the tensioning member is rotated to make the pressing frame continuously pressed downward, so that the pressing sleeve, packing B, elastic sealing sleeve, packing A and sealing wiper sleeve sleeved on the valve stem slide downward in sequence, and at the same time, they are compacted and fixed under the action of the limiting sealing sleeve, thereby improving the sealing effect during use.

[0018] The present invention is further configured as follows: a pressure relief port is provided on the side wall of the elastic sealing sleeve near the bottom, a pressure relief hole is provided on the outer wall of the bracket correspondingly near the pressure relief port, and a sealing gasket is provided at the contact position between the bottom of the bracket and the top of the valve body.

[0019] Through the above technical solution, the pressure relief ports and pressure relief holes respectively arranged at the corresponding positions of the outer walls of the elastic sealing sleeve and the bracket facilitate the discharge of internal pressure in low or high temperature environments, helping to ensure that the valve can maintain stable operation under abnormal conditions and reduce downtime and maintenance costs.

[0020] The present invention is further configured as follows: the manual component includes an adjusting nut seat rotatably connected to the top of the bracket, and the inner wall of the adjusting nut seat is threadedly connected to the outer wall of the threaded rod, a limiting sleeve is fitted on the outer wall of the adjusting nut seat, and the outer wall of the limiting sleeve is threadedly connected to the top position of the inner wall of the bracket, an adjusting handwheel is sleeved on the outer wall of the adjusting nut seat near the top position, a locking pressure block is threadedly connected to the outer wall of the adjusting nut seat near the top position, and the bottom of the locking pressure block is pressed against the top of the adjusting handwheel, and the adjusting handwheel is pressed against the outer wall of the adjusting nut seat at the same time.

[0021] Through the above technical solution, the adjusting nut seat is threadedly connected to the outer wall of the threaded rod and installed in the top groove of the bracket, and the adjusting nut seat is limited and fixed in the rotation position using a limit sleeve, and the adjusting handwheel sleeved on the adjusting nut seat is pressed and fixed using a locking block, so that the adjusting handwheel can be rotated to drive the threaded rod to move up and down through the internal adjusting nut seat, thereby enabling the bottom valve disc to be opened and closed.

[0022] On the other hand, a method for assembling a portable cast steel knife-type gate valve is provided, comprising the following steps: S1. First, install the sealing rings in the sealing grooves inside the valve body, and install the two mounting rings with the retaining rings inside in the corresponding mounting grooves; S2. Then, the protective seat is threadedly connected to the inner bottom of the valve body through the mounting studs, and the multiple rotating nuts are rotated at the same time, so that the end face of the sealing cap can be pressed against the sealing components on both sides, so that the sealing components are stably fixed inside the mounting groove; S3, then install the valve disc on the T-shaped connecting block at the bottom of the valve stem through the T-shaped connecting groove at the top of the valve disc, and slide the valve disc on the slide rail using the slide groove provided therein, so that the valve disc slides into the interior of the valve body; S4, then the limiting sealing sleeve is threadedly connected and fixed from the bottom of the bracket, and the bracket is sleeved on the outer wall of the valve stem through the limiting sealing sleeve, and the bracket is installed on the top of the valve body using multiple connecting bolts; S5, then sequentially sleeve the sealing wiper sleeve, packing A, elastic sealing sleeve, packing B, pressing sleeve and pressing frame on the outer wall of the valve stem, and rotate the nut on the tensioning member to continuously press the pressing frame downward, so that the pressing sleeve, packing B, elastic sealing sleeve, packing A and sealing wiper sleeve sleeved on the valve stem slide downward in sequence, and at the same time, they are compacted and fixed under the action of the limiting sealing sleeve; S6. Finally, thread the adjusting nut seat onto the outer wall of the threaded rod and install it into the top groove of the bracket. Use a limit sleeve to limit and fix the rotating position of the adjusting nut seat. Use a locking block to tighten and fix the adjusting handwheel sleeved on the adjusting nut seat to complete the assembly operation of the knife-type gate valve.

[0023] The beneficial effects of the present invention are as follows: 1. The portable cast steel knife-type gate valve and its assembly method proposed by the present invention are provided with sealing components symmetrically on both sides of the valve disc, so that the valve disc can be squeezed and sealed on both sides when closed, thereby improving the sealing and cutting sealing effect of the knife-type gate valve; 2. The portable cast steel knife-type gate valve and its assembly method proposed by the present invention are provided with a protective seat at the inner bottom of the valve body, so that it can not only tightly fix the sealing components on both sides during installation, thereby improving the stability during use, but also can receive and protect the bottom of the valve disc that is rapidly descended and closed, thereby preventing the valve disc from causing impact and wear on the inside of the valve body, thereby improving the service life of the valve body; 3. The portable cast steel knife-type gate valve and its assembly method proposed by the present invention ensures the adaptability of the internal packing when it is compressed, thereby improving the sealing effect at the stuffing box by arranging an elastic sealing sleeve in the stuffing box. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural diagram of the present invention; Figure 2 It is a cross-sectional structural diagram of the present invention; Figure 3 It is a cross-sectional structural diagram of the valve body in the present invention; Figure 4 This is a structural diagram of the connection between the sealing assembly and the valve disc in the present invention; Figure 5 is an exploded view of the sealing assembly of the present invention; Figure 6 It is a structural diagram of the protective seat in the present invention; Figure 7 This is a structural diagram of the connection between the valve stem and the valve disc in the present invention; Figure 8 for Figure 2 The enlarged view of point A in the middle; Fig. 9 for Figure 2Enlarged view of point B in the middle.

[0025] In the figure: 1, valve body; 11, mounting groove; 12, sealing groove; 13, slide rail; 14, sealing gasket; 2. Sealing assembly; 21. Mounting ring; 22. Clamping groove; 23. Retaining ring; 24. Clamping block; 25. Sealing ring; 3. Protective seat; 31. Arc block; 32. Protective extrusion block; 33. Mounting stud; 34. Positioning column; 35. Rotating nut; 36. Tightening cap; 4. Valve disc; 41. Receiving groove; 42. Sliding groove; 43. T-type connecting groove; 5. Valve stem; 51. T-type connection block; 52. Sealing cone surface; 6. Threaded rod; 7. Bracket; 71. Pressure relief hole; 8. Packing assembly; 81. Position limiting sealing sleeve; 82. Sealing wiper sleeve; 83. Packing A; 84. Elastic sealing sleeve; 841. Pressure relief port; 85. Packing B; 86. Pressing sleeve; 87. Pressing frame; 88. Tensioning piece; 9. Manual assembly; 91. Adjusting nut seat; 92. Limit sleeve; 93. Adjusting hand wheel; 94. Locking block. DETAILED DESCRIPTION

[0026] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0027] like Figure 1-Figure 5As shown, a convenient cast steel knife-type gate valve and its assembly method include a valve body 1, which is used to connect pipelines on both sides. A sealing groove 12 is opened in the valve body 1 near the mounting groove 11, and a sealing ring 25 is connected to the inside of the sealing groove 12, and is tightly arranged with one side of the retaining ring 23. The sealing ring 25 can be used to squeeze and seal the connection between the sealing component 2 and the mounting groove 11, thereby improving the sealing effect of the valve body 1 in use. The sealing component 2 is symmetrically installed in the valve body 1 near the middle position, and is used to contact and seal between the valve body 1 and the valve disc 4. The sealing component 2 includes a mounting ring 21, and the mounting ring 21 is installed at Inside the mounting groove 11 set on the valve seat in the valve body 1, the inner wall of the mounting ring 21 is engaged with a retaining ring 23, and the retaining ring 23 is embedded in the groove 22 opened on the inner wall of the mounting ring 21 through the clamping block 24 set on its outer wall, and the opposing surfaces of the retaining ring 23 and the valve disc 4 are serrated. The retaining ring 23 is mounted on the inner wall of the mounting ring 21 by the clamping block 24 set on the outer wall, and the side wall of the mounting ring 21 is wrapped and fixed, thereby improving the sealing effect between the valve body 1 and the valve disc 4, and a serration is set on the contact side of the valve disc 4, so that when the valve disc 4 squeezes the sealing component 2, it can improve the sealing during squeezing.

[0028] like Figure 6 As shown, the protective seat 3 is threadedly connected at the center of the inner bottom of the valve body 1, and is used to tighten the sealing components 2 on both sides. The protective seat 3 includes an arc block 31, and the top of the arc block 31 is symmetrically fixedly connected with a protective extrusion block 32 near the end surface. The middle of the arc block 31 is penetrated by a mounting stud 33, and the mounting stud 33 is threadedly connected to the inner bottom of the valve body 1, and the two side walls of the arc block 31 are symmetrically fixedly connected with positioning columns 34 away from the middle position, and the outer walls of the two groups of positioning columns 34 are threadedly connected with rotating nuts 35, and the end faces of the rotating nuts 35 are fixedly connected with tightening caps 36, and the end faces of the two groups of tightening caps 36 are respectively tightened to the opposite surfaces of the sealing components 2 on both sides, and the protective seat 3 is threadedly connected to the inner bottom of the valve body 1 through the mounting studs 33, and the multiple rotating nuts 35 are rotated at the same time, so that the tightening caps 36 on the end faces can tighten the sealing components 2 on both sides, so that the sealing components 2 are stably fixed inside the mounting groove 11.

[0029] like Figure 3 and Figure 7As shown, the valve flap 4 is slidably connected to the inner wall of the valve body 1, and is used to cut off and seal the inner cavity of the valve body 1. The valve stem 5 is movably connected to the top of the valve flap 4, and is used to drive the valve flap 4 to move up and down inside the valve body 1. The bottom of the valve flap 4 is provided with a receiving groove 41, and it is pressed against the tops of the two protective extrusion blocks 32. The side wall of the valve flap 4 is symmetrically provided with sliding grooves 42, and is slidably connected to the slide rails 13 arranged at the corresponding positions of the sliding grooves 42 inside the valve body 1 through the sliding grooves 42, so that the valve flap 4 can be pressed against the protective extrusion blocks 32 after it is lowered, thereby avoiding the valve flap 4. The collision and wear between the valve body 1 and the valve disc 4 can be stably lifted and lowered inside the valve body 1 under the action of the slide rail 13. A T-shaped connecting groove 43 is provided on the top of the valve disc 4, and a T-shaped connecting block 51 is provided at the bottom of the valve stem 5, and is engaged with the T-shaped connecting groove 43 through the T-shaped connecting block 51. A sealing cone surface 52 is provided on the outer wall of the valve stem 5 near the bottom position, which is convenient for the valve stem 5 to be quickly connected and fixed with the valve disc 4, and the provided sealing cone surface 52 can be squeezed and sealed with the bottom of the limiting sealing sleeve 81 after rising.

[0030] like Figure 2 and Figure 8As shown, the bracket 7 is connected to the top of the valve body 1 by a plurality of bolts, and is sleeved on the outside of the valve stem 5 and the threaded rod 6, so as to keep the valve stem 5 and the threaded rod 6 stable. The packing assembly 8 is sleeved on the outer wall of the valve stem 5 near the top, and is tightly fitted on the inner wall of the bracket 7, so as to seal the lifting and lowering position of the valve stem 5. The packing assembly 8 includes a limit sealing sleeve 81 threadedly connected to the inner wall of the bracket 7 near the bottom, a sealing wiper sleeve 82 is arranged at the top of the inner wall of the limit sealing sleeve 81, and a plurality of fittings are fixedly connected to the inner wall of the sealing wiper sleeve 82. At the wiper portion of the outer wall of the valve stem 5, a packing A83 is arranged on the top of the limiting sealing sleeve 81, and an elastic sealing sleeve 84 is arranged against the top of the packing A83. A pressure relief port 841 is provided on the side wall of the elastic sealing sleeve 84 near the bottom, and a pressure relief hole 71 is provided on the outer wall of the bracket 7 at a position corresponding to the pressure relief port 841, and a sealing gasket 14 is arranged at the contact position between the bottom of the bracket 7 and the top of the valve body 1. The pressure relief port 841 and the pressure relief hole 71 respectively arranged at the corresponding positions of the elastic sealing sleeve 84 and the outer wall of the bracket 7 facilitate the internal pressure relief in a low temperature or high temperature environment. The discharge of force helps to ensure that the valve can still maintain stable operation under abnormal conditions, reducing downtime and maintenance costs. The top of the elastic sealing sleeve 84 is tightly set with a packing B85, the top of the packing B85 is pressed and set with a pressing sleeve 86, and the top of the pressing sleeve 86 is pressed and set with a pressing frame 87. The two ends of the pressing frame 87 are symmetrically penetrated with tensioning pieces 88. The bottoms of the two tensioning pieces 88 are respectively installed on the side walls of the bracket 7 by bolts. The limiting sealing sleeve 81, the sealing wiper sleeve 82, the packing A83, the elastic sealing sleeve 84, the packing B85, the pressing sleeve 86 and The pressing frame 87 is sequentially fitted and sleeved on the outer wall of the valve stem 5, and the sealing wiper sleeve 82, the packing A83, the elastic sealing sleeve 84, the packing B85, the pressing sleeve 86 and the pressing frame 87 are sleeved on the outer wall of the valve stem 5 in sequence, and the nut on the tensioning member 88 is rotated to make the pressing frame 87 continuously pressed downward, so that the pressing sleeve 86, the packing B85, the elastic sealing sleeve 84, the packing A83 and the sealing wiper sleeve 82 sleeved on the valve stem 5 slide downward in sequence, and at the same time, they are compacted and fixed under the action of the limiting sealing sleeve 81, thereby improving the sealing effect during use; like Figure 2 and Fig. 9As shown, the manual assembly 9 is detachably mounted on the top of the bracket 7, and is used to drive the threaded rod 6 to move up and down. The manual assembly 9 includes an adjusting nut seat 91 rotatably connected to the top of the bracket 7, and the inner wall of the adjusting nut seat 91 is threadedly connected to the outer wall of the threaded rod 6. The threaded rod 6 is fixedly connected to the top of the valve stem 5, and is used to drive the valve stem 5 to move up and down. The outer wall of the adjusting nut seat 91 is fitted with a limiting sleeve 92, and the outer wall of the limiting sleeve 92 is threadedly connected to the top position of the inner wall of the bracket 7. The outer wall of the adjusting nut seat 91 is sleeved with an adjusting handwheel 93 near the top position, and the outer wall of the adjusting nut seat 91 is threadedly connected to the top position. There is a locking pressure block 94, and the bottom of the locking pressure block 94 is pressed against the top of the adjusting handwheel 93. At the same time, the adjusting handwheel 93 is pressed against the outer wall of the adjusting nut seat 91, and the adjusting nut seat 91 is threadedly connected to the outer wall of the threaded rod 6 and installed in the top groove of the bracket 7. The adjusting nut seat 91 is limited and fixed in the rotation position by the limiting sleeve 92, and the adjusting handwheel 93 sleeved on the adjusting nut seat 91 is pressed and fixed by the locking pressure block 94, so that the adjusting handwheel 93 can be rotated, so that it can drive the threaded rod 6 to move up and down through the internal adjusting nut seat 91, thereby enabling the valve disc 4 at the bottom to be opened and closed.

[0031] like Figure 1-Figure 9 As shown, a method for assembling a convenient cast steel knife-type gate valve comprises the following steps: S1. First, install the sealing rings 25 in the sealing grooves 12 in the valve body 1, and install the two mounting rings 21 with the retaining rings 23 in the corresponding mounting grooves 11; S2, then the protection seat 3 is threadedly connected to the inner bottom of the valve body 1 through the mounting studs 33, and the multiple rotating nuts 35 are rotated at the same time, so that the end surface of the tight cap 36 can be pressed against the sealing components 2 on both sides, so that the sealing components 2 are stably fixed inside the mounting groove 11; S3, then install the valve disc 4 on the T-shaped connecting block 51 at the bottom of the valve stem 5 through the T-shaped connecting groove 43 at the top, and slide the valve disc 4 on the slide rail 13 using the slide groove 42 provided therein, so that the valve disc 4 slides into the interior of the valve body 1; S4, then the limiting sealing sleeve 81 is threadedly connected and fixed from the bottom of the bracket 7, and the bracket 7 is sleeved on the outer wall of the valve stem 5 through the limiting sealing sleeve 81, and the bracket 7 is installed on the top of the valve body 1 using multiple connecting bolts; S5, then sequentially sleeve the sealing wiper sleeve 82, packing A83, elastic sealing sleeve 84, packing B85, pressing sleeve 86 and pressing frame 87 on the outer wall of the valve stem 5, and rotate the nut on the tensioning member 88 to continuously press the pressing frame 87 downward, so that the pressing sleeve 86, packing B85, elastic sealing sleeve 84, packing A83 and sealing wiper sleeve 82 sleeved on the valve stem 5 slide downward in sequence, and at the same time, they are compacted and fixed under the action of the limiting sealing sleeve 81; S6. Finally, the adjusting nut seat 91 is threadedly connected to the outer wall of the threaded rod 6 and installed in the top groove of the bracket 7. The limiting sleeve 92 is used to limit and fix the rotating position of the adjusting nut seat 91. At the same time, the locking block 94 is used to tighten and fix the adjusting hand wheel 93 sleeved on the adjusting nut seat 91, thereby completing the assembly operation of the knife-type gate valve.

[0032] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A portable cast steel knife-type gate valve, characterized in that: include The valve body (1) is used to connect the pipelines on both sides; A sealing assembly (2), wherein the sealing assembly (2) is symmetrically mounted near the middle of the valve body (1) and is used to provide contact sealing between the valve body (1) and the valve disc (4); A protective seat (3), the protective seat (3) being threadedly connected to the center of the inner bottom of the valve body (1) and used to tighten the sealing components (2) on both sides; A valve flap (4), the valve flap (4) being slidably connected to the inner wall of the valve body (1) and used for cutting off and sealing the inner cavity of the valve body (1); A valve stem (5), the valve stem (5) being movably connected to the top of the valve disc (4) and used for driving the valve disc (4) to move up and down inside the valve body (1); A threaded rod (6), the threaded rod (6) being fixedly connected to the top of the valve stem (5) and used for driving the valve stem (5) to move up and down; A bracket (7), the bracket (7) being connected to the top of the valve body (1) via a plurality of bolts and being sleeved on the outside of the valve stem (5) and the threaded rod (6) to maintain stability of the valve stem (5) and the threaded rod (6); A packing assembly (8), wherein the packing assembly (8) is sleeved on the outer wall of the valve stem (5) near the top and is tightly fitted to the inner wall of the bracket (7), and is used to seal the lifting and lowering movable position of the valve stem (5); A manual assembly (9) is detachably mounted on the top of the bracket (7) and is used to drive the threaded rod (6) to move up and down.

2. A portable cast steel knife-type gate valve according to claim 1, characterized in that: The sealing assembly (2) comprises a mounting ring (21), the mounting ring (21) being mounted inside a mounting groove (11) provided on a valve seat inside a valve body (1), the inner wall of the mounting ring (21) being snap-connected with a retaining ring (23), the retaining ring (23) being embedded in a retaining groove (22) provided on the inner wall of the mounting ring (21) via a retaining block (24) provided on its outer wall, and the opposing surfaces of the retaining ring (23) and the valve disc (4) are serrated.

3. A portable cast steel knife-type gate valve according to claim 2, characterized in that: A sealing groove (12) is provided inside the valve body (1) near the mounting groove (11), and a sealing ring (25) is snap-fitted and connected inside the sealing groove (12), and is tightly arranged against one side of the retaining ring (23).

4. A portable cast steel knife-type gate valve according to claim 1, characterized in that: The protective seat (3) comprises an arc block (31), the top of the arc block (31) is symmetrically fixedly connected to a protective extrusion block (32) near the end surface, the middle of the arc block (31) is provided with a mounting stud (33), and the mounting stud (33) is threadedly connected to the inner bottom of the valve body (1), and the two side walls of the arc block (31) are symmetrically fixedly connected to positioning columns (34) away from the middle, the outer walls of the two groups of the positioning columns (34) are threadedly connected to rotating nuts (35), and the end faces of the rotating nuts (35) are fixedly connected to locking caps (36), and the end faces of the two groups of locking caps (36) are respectively pressed against the opposite surfaces of the sealing components (2) on both sides.

5. A portable cast steel knife-type gate valve according to claim 4, characterized in that: The bottom of the valve flap (4) is provided with a receiving groove (41) which is pressed against the tops of the two protective extrusion blocks (32); the side wall of the valve flap (4) is symmetrically provided with sliding grooves (42) which are slidably connected to a sliding rail (13) provided at a position corresponding to the sliding groove (42) inside the valve body (1) through the sliding grooves (42).

6. A portable cast steel knife-type gate valve according to claim 5, characterized in that: The top of the valve flap (4) is provided with a T-shaped connecting groove (43), the bottom of the valve stem (5) is provided with a T-shaped connecting block (51) and is snap-connected to the T-shaped connecting groove (43) via the T-shaped connecting block (51), and a sealing cone surface (52) is provided on the outer wall of the valve stem (5) near the bottom.

7. A portable cast steel knife-type gate valve according to claim 1, characterized in that: The packing assembly (8) comprises a limit sealing sleeve (81) threadedly connected to the inner wall of the bracket (7) near the bottom, a sealing wiper sleeve (82) is arranged at the top of the inner wall of the limit sealing sleeve (81), and the inner wall of the sealing wiper sleeve (82) is fixedly connected with a plurality of wiper parts that fit the outer wall of the valve stem (5), a packing A (83) is arranged at the top of the limit sealing sleeve (81), an elastic sealing sleeve (84) is tightly arranged on the top of the packing A (83), a packing B (85) is tightly arranged on the top of the elastic sealing sleeve (84), a pressing sleeve (86) is pressed on the top of the packing B (85), a pressing frame (87) is pressed on the top of the pressing sleeve (86), and tensioning members (88) are symmetrically arranged at both ends of the pressing frame (87), and the bottoms of the two tensioning members (88) are respectively mounted on the side walls of the bracket (7) by bolts; The limiting sealing sleeve (81), the sealing wiper sleeve (82), the packing A (83), the elastic sealing sleeve (84), the packing B (85), the pressing sleeve (86) and the pressing frame (87) are sequentially fitted and sleeved on the outer wall of the valve stem (5).

8. A portable cast steel knife-type gate valve according to claim 7, characterized in that: A pressure relief port (841) is provided on the side wall of the elastic sealing sleeve (84) near the bottom, a pressure relief hole (71) is provided on the outer wall of the bracket (7) at a position close to the pressure relief port (841), and a sealing gasket (14) is provided at the contact position between the bottom of the bracket (7) and the top of the valve body (1).

9. A portable cast steel knife-type gate valve according to claim 1, characterized in that: The manual assembly (9) comprises an adjusting nut seat (91) rotatably connected to the top of the bracket (7), and the inner wall of the adjusting nut seat (91) is threadedly connected to the outer wall of the threaded rod (6), a limiting sleeve (92) is fitted on the outer wall of the adjusting nut seat (91), and the outer wall of the limiting sleeve (92) is threadedly connected to the top position of the inner wall of the bracket (7), an adjusting hand wheel (93) is sleeved on the outer wall of the adjusting nut seat (91) near the top position, and a locking pressure block (94) is threadedly connected to the outer wall of the adjusting nut seat (91) near the top position, and the bottom of the locking pressure block (94) is pressed against the top of the adjusting hand wheel (93), and the adjusting hand wheel (93) is pressed against the outer wall of the adjusting nut seat (91).

10. A method for assembling a portable cast steel knife-type gate valve according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. First, the sealing rings (25) are installed in the sealing grooves (12) inside the valve body (1), and at the same time, the two mounting rings (21) carrying the retaining rings (23) inside are installed in the corresponding mounting grooves (11); S2, then threading the protection seat (3) to the inner bottom of the valve body (1) via the mounting studs (33), and rotating the plurality of rotating nuts (35) at the same time, so that the end face tightening caps (36) can tighten the sealing assemblies (2) on both sides, so that the sealing assemblies (2) are stably fixed inside the mounting groove (11); S3, then the valve disc (4) is mounted on the T-shaped connecting block (51) at the bottom of the valve stem (5) through the T-shaped connecting groove (43) at the top thereof, and the valve disc (4) is slidably mounted on the slide rail (13) using the slide groove (42) provided therein, so that the valve disc (4) slides into the interior of the valve body (1); S4, then the limiting sealing sleeve (81) is threadedly connected and fixed from the bottom of the bracket (7), and the bracket (7) is sleeved on the outer wall of the valve stem (5) through the limiting sealing sleeve (81), and the bracket (7) is installed on the top of the valve body (1) using a plurality of connecting bolts; S5, then, the sealing wiper sleeve (82), the packing A (83), the elastic sealing sleeve (84), the packing B (85), the pressing sleeve (86) and the pressing frame (87) are sequentially sleeved on the outer wall of the valve stem (5), and the nut on the tensioning member (88) is rotated so that the pressing frame (87) is continuously pressed downward, thereby causing the pressing sleeve (86), the packing B (85), the elastic sealing sleeve (84), the packing A (83) and the sealing wiper sleeve (82) sleeved on the valve stem (5) to slide downward in sequence, and at the same time, they are compacted and fixed under the action of the limiting sealing sleeve (81); S6. Finally, the adjusting nut seat (91) is threadedly connected to the outer wall of the threaded rod (6) and installed in the top groove of the bracket (7). The adjusting nut seat (91) is limited and fixed in rotation position using the limiting sleeve (92). At the same time, the adjusting hand wheel (93) sleeved on the adjusting nut seat (91) is pressed and fixed using the locking block (94), thereby completing the assembly operation of the knife-type gate valve.

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