Block valve for bidirectional control natural gas pipeline

Abstract

The utility model discloses a block valve for a two-way control natural gas pipeline, which comprises a valve body, a valve cover is arranged at the top of the valve body, a valve seat is arranged at the bottom in the valve body, a gas inlet pipe is arranged at the bottom of the valve body and communicated with the valve seat, and a gas outlet pipe is arranged on the peripheral side of the valve body and communicated with the inside of the valve body. Sealing assemblies are arranged at the ends, deviating from the valve body, of the gas inlet pipe and the gas outlet pipe correspondingly and used for connecting the valve body with a natural gas pipeline in a sealed mode, and an adjusting assembly is arranged at the top of the valve deck. The adjusting assembly comprises a gland, the gland is fixedly arranged at the top of the valve deck, a supporting barrel frame is vertically and upwards installed on the peripheral wall of the gland, a fixing disc is arranged at the top of the supporting barrel frame, a valve rod coaxially penetrates through the fixing disc in a threaded mode, the bottom of the valve rod penetrates through the gland and the valve deck and extends into the valve body to be provided with a valve element, and the valve element is matched with the valve seat. The valve element is driven to ascend and descend by rotating the valve rod, and then opening and closing of the block valve are controlled.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipeline valve technical field, concretely relates to a kind of cut-off valve for bidirectional control natural gas pipeline. BACKGROUND

[0002] With the transformation of global energy structure and the growth of clean energy demand, natural gas, as a clean and efficient energy, its development and utilization have been valued by countries around the world. China, as a big energy consumer, has been promoting the optimization of energy structure in recent years, and the proportion of natural gas in primary energy consumption has been rising year by year. In order to meet the growing demand for natural gas, long-distance gas pipeline networks have developed rapidly. These pipelines cross different geographical areas and face complex environmental and climatic conditions, and their safe operation is directly related to public safety and environmental protection. Once a leak, explosion or other accident occurs, it will not only cause huge economic losses, but also cause serious harm to personal safety and the environment. In the natural gas pipeline system, the cut-off valve is an important device for quickly cutting off the pipeline fluid in an emergency.

[0003] However, in the existing cut-off valve adjustment process, when the valve rod height is too high, there is an uneven force phenomenon during the rotation of the valve rod, which is prone to radial wear of the valve rod. Long-term use may cause natural gas to leak at the valve rod, endangering personal safety. Or the valve rod shakes during operation, increasing the difficulty of adjusting the valve rod and affecting the adjustment efficiency.

[0004] Therefore, it is necessary to provide a bidirectional control cut-off valve for natural gas pipeline to solve the problems mentioned in the background. UTILITY MODEL CONTENT

[0005] To achieve the above purpose, the utility model provides the following technical scheme: a bidirectional control cut-off valve for natural gas pipeline, comprising a valve body, a valve cover is installed on the top of the valve body, a valve seat is arranged on the inner bottom of the valve body, an air inlet pipe is arranged in communication with the valve seat at the bottom of the valve body, and an air outlet pipe is arranged in communication with the inside of the valve body. Its characteristic is that one end of the air inlet pipe and the air outlet pipe away from the valve body is provided with a sealing assembly for sealing and connecting the valve body with the natural gas pipeline, and an adjusting assembly is arranged on the top of the valve cover.

[0006] The adjusting assembly comprises a gland, the gland is fixedly arranged on the top of the valve cover, a support cylinder frame is vertically upwardly installed on the outer peripheral wall of the gland, a fixing disc is arranged on the top of the support cylinder frame, a valve rod is coaxially threaded through the fixing disc, a valve core is arranged in the valve body by extending the valve rod bottom through the gland and valve cover, and the valve core is matched with the valve seat.

[0007] Among them, the valve core is lifted by rotating the valve rod, and the opening and closing of the cut-off valve is controlled.

[0008] Preferably, the upper part of the valve rod is an external thread structure, the lower part of the valve rod is a polished rod structure, the polished rod structure is externally sleeved with a stable seat, the stable seat is fixed on the top of the gland, and the stable seat is used for preventing the valve rod from shaking during rotation and lifting.

[0009] Preferably, a hand wheel is connected to the upper part of the valve rod in a threaded mode, and the bottom of the hand wheel is rotationally and positionally connected with the fixed disc.

[0010] Preferably, the top end of the valve core is coaxially provided with a connecting rod, and the connecting rod is detachably connected with the bottom of the valve rod.

[0011] Preferably, the top of the valve body and the bottom of the valve cover are respectively provided with ring grooves one and two, and a sealing rubber ring is jointly installed in the ring grooves one and two; and the valve body and the valve cover are connected through a plurality of fastening bolts uniformly arranged on the periphery.

[0012] Preferably, a cylindrical cavity is coaxially arranged in the interior of the gland, and the cylindrical cavity is filled with a packing for sealing.

[0013] Preferably, the sealing assembly comprises connecting flanges fixed on the ends, away from the valve body, of the air inlet pipe and the air outlet pipe, and an annular sealing groove is coaxially arranged in the end, away from the valve body, of the connecting flange, and a sealing ring is installed in the annular sealing groove; the sealing ring is extruded through the connection of the connecting flange with the pipeline connection end, so that the pipeline is sealingly connected with the air inlet pipe and the air outlet pipe.

[0014] Compared with the prior art, the utility model provides a kind of cut-off valve for bidirectional control natural gas pipeline, with the following beneficial effects:

[0015] In the utility model, the upper and lower parts of the valve rod are radially limited by the setting of support cylinder frame, valve rod, stable seat and fixed disc, so that the valve rod does not shake during rotation and lifting, the radial wear during rotation of the valve rod is reduced, and the operation of the cut-off valve is more flexible and efficient;And set sealing assembly, ensure that the connecting part of cut-off valve and external pipeline maintains good sealing, improve the safety of natural gas transportation. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a kind of bidirectional control natural gas pipeline cut-off valve overall structure schematic view;

[0017] Figure 2 It is a kind of bidirectional control natural gas pipeline cut-off valve adjusting assembly sectional structure schematic view;

[0018] Figure 3It is a kind of bidirectional control natural gas pipeline with cut-off valve body and valve cover cross-section structure schematic diagram;

[0019] Figure 4 It is a kind of bidirectional control natural gas pipeline with cut-off valve sealing assembly structure schematic diagram;

[0020] In the figure: 1, valve body;2, valve cover;3, gland;4, stabilizing seat;5, support cylinder frame;6, fixed disc;7, hand wheel;8, valve stem;9, valve core;10, valve seat;11, connecting rod;12, inlet pipe;13, outlet pipe;14, annular groove one;15, annular groove two;16, sealing rubber ring;17, packing;18, connecting flange;19, annular sealing groove;20, sealing ring. DETAILED DESCRIPTION

[0021] Please refer to Figures 1-4 The utility model provides a kind of cut-off valve for bidirectional control natural gas pipeline, including valve body 1, the top of the valve body 1 is equipped with valve cover 2, the bottom of the valve body 1 is provided with valve seat 10, the bottom of the valve body 1 is provided with inlet pipe 12 with the valve seat 10 communication, the periphery of the valve body 1 is provided with outlet pipe 13 with its inside communication, the end of the inlet pipe 12 and outlet pipe 13 deviating from the valve body 1 is provided with sealing assembly, for sealing connection between the valve body 1 and natural gas pipeline, the top of the valve cover 2 is provided with adjusting assembly;

[0022] The adjusting assembly includes gland 3, the gland 3 is fixed in the top of the valve cover 2, the outer peripheral wall of the gland 3 is vertically upwards installed with support cylinder frame 5, the top of the support cylinder frame 5 is provided with fixed disc 6, the fixed disc 6 is coaxially threaded with valve stem 8, the bottom of the valve stem 8 is extended to the inside of the valve body 1 with valve core 9 being provided with the gland 3 and valve cover 2, the valve core 9 is adapted with the valve seat 10;

[0023] Wherein, by rotating the valve stem 8 drives the valve core 9 to lift, to control the opening and closing of the cut-off valve.

[0024] Specifically, by setting adjusting assembly, the height position of valve stem 8 is adjusted, to drive the relative position of valve core 9 and valve seat 10 to change, to control the opening and closing of the cut-off valve. At the same time, by support cylinder frame 5 and fixed disc 6, the upper part of valve stem 8 is limited, to prevent valve stem 8 from shaking during lifting process of rotating valve stem 8, increase control difficulty, accelerate the radial wear of valve stem 8.

[0025] Further, the upper part of the valve stem 8 is external thread structure, the lower part of the valve stem 8 is light pole structure, the outside of the light pole structure is slidably sealed with stabilizing seat 4, the stabilizing seat 4 is fixed in the top of the gland 3, the stabilizing seat 4 is used to prevent valve stem 8 from shaking during rotating lifting process.

[0026] Wherein, the top of the gland 3 is provided with a stabilizing seat 4 which is in sliding sealing cooperation with the outer side of the light pole structure, further increasing the radial limitation of the valve stem 8, avoiding the clearance between the valve stem 8 and the fixed disc 6 increasing due to the wear of the threads, resulting in the valve stem 8 shaking during the lifting process.

[0027] Further, the upper part of the valve stem 8 is threadedly connected with a hand wheel 7, and the bottom of the hand wheel 7 is rotationally limitedly connected with the fixed disc 6.

[0028] Specifically, the bottom of the hand wheel 7 is provided with a limiting protrusion, and the top of the fixed disc 6 is provided with a limiting groove, and the limiting protrusion is rotationally arranged in the limiting groove, thereby preventing the hand wheel 7 from moving axially while realizing the rotation of the hand wheel 7.

[0029] Further, the top end of the valve core 9 is coaxially provided with a connecting rod 11, and the connecting rod 11 is detachably connected with the bottom of the valve stem 8.

[0030] It should be explained that, by detachably assembling the valve stem 8 and the connecting rod 11, the valve core 9 or the valve stem 8 can be quickly replaced when they are damaged.

[0031] Further, the top of the valve body 1 and the bottom of the valve cover 2 are respectively provided with ring groove one 14 and ring groove two 15, and a sealing rubber ring 16 is jointly installed in the ring groove one 14 and the ring groove two 15; the valve body 1 and the valve cover 2 are connected by a plurality of fastening bolts uniformly arranged on the circumferential side, thereby preventing natural gas from leaking at the connection between the valve body 1 and the valve cover 2.

[0032] Further, a cylindrical cavity is coaxially arranged in the interior of the gland 3, and the cylindrical cavity is filled with a sealing filler 17, such as graphite, polytetrafluoroethylene, etc.

[0033] Further, the sealing assembly comprises a connecting flange 18 fixedly arranged on the gas inlet pipe 12 and the gas outlet pipe 13 away from the valve body 1, and the connecting flange 18 is coaxially provided with a ring-shaped sealing groove 19 away from the valve body 1, and a sealing ring 20 is installed in the ring-shaped sealing groove 19, and the sealing ring 20 is extruded by the connecting flange 18 and the pipeline connection end, thereby realizing the sealing connection of the pipeline and the gas inlet pipe 12 and the gas outlet pipe 13, and preventing natural gas from leaking at the connection between the gas inlet pipe 12 or the gas outlet pipe 13.

[0034] In specific implementation, the sealing assembly is connected with the natural gas pipeline, and then the hand wheel is rotated to control the valve stem to drive the valve core to lift, thereby controlling the opening and closing of the shut-off valve. By arranging the support cylinder frame, the stabilizing seat and the fixed disc, the upper and lower parts of the valve stem are radially limited, thereby ensuring that the valve stem does not shake during the lifting process, reducing the radial wear of the valve stem during rotation, and making the operation of the shut-off valve more flexible and efficient.

[0035] The above merely describes a preferred embodiment of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art, according to the technical scheme and the inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A bidirectional control cut-off valve for natural gas pipeline, comprising a valve body (1), a valve cover (2) is installed on the top of the valve body (1), a valve seat (10) is arranged at the bottom of the valve body (1), an air inlet pipe (12) is arranged at the bottom of the valve body (1) and communicated with the valve seat (10), and an air outlet pipe (13) is arranged at the side of the valve body (1) and communicated with the inside of the valve body (1), characterized in that, The air inlet pipe (12) and the air outlet pipe (13) are provided with sealing assemblies at the ends away from the valve body (1) for sealingly connecting the valve body (1) with the natural gas pipeline, and the top of the valve cover (2) is provided with an adjusting assembly; The adjusting assembly comprises a gland (3) fixedly arranged on the top of the valve cover (2), an outer peripheral wall of the gland (3) is vertically upwardly provided with a support cylinder frame (5), the top of the support cylinder frame (5) is provided with a fixing disc (6), a valve rod (8) is coaxially and threadedly arranged on the fixing disc (6), the bottom of the valve rod (8) extends through the gland (3) and the valve cover (2) to the inside of the valve body (1) and is provided with a valve core (9), and the valve core (9) is matched with the valve seat (10). The valve rod (8) is rotated to drive the valve core (9) to ascend and descend, thereby controlling the opening and closing of the shut-off valve.

2. The shut-off valve for bidirectional control of natural gas pipelines according to claim 1, characterized in that The upper part of the valve rod (8) is an external thread structure, the lower part of the valve rod (8) is a plain rod structure, a stable seat (4) is slidably and sealingly arranged on the outer side of the plain rod structure, the stable seat (4) is fixedly arranged on the top of the gland (3), and the stable seat (4) is used for preventing the valve rod (8) from shaking during rotation and lifting.

3. The shut-off valve for bidirectional control of natural gas pipelines according to claim 1, characterized in that, A hand wheel (7) is threadedly connected to the upper rod body of the valve rod (8), and the bottom of the hand wheel (7) is rotationally and limitingly connected with the fixing disc (6).

4. The shut-off valve for bidirectional control of natural gas pipelines according to claim 1, characterized in that, A connecting rod (11) is coaxially arranged at the top end of the valve core (9), and the connecting rod (11) is detachably connected with the bottom of the valve rod (8).

5. The shut-off valve for bidirectional control of natural gas pipelines according to claim 1, characterized in that, Corresponding annular grooves (14) and (15) are respectively arranged on the top of the valve body (1) and the bottom of the valve cover (2), a sealing rubber ring (16) is jointly arranged in the annular grooves (14) and (15), and the valve body (1) and the valve cover (2) are connected through a plurality of fastening bolts uniformly arranged on the circumferential sides.

6. The shut-off valve for bidirectional control of natural gas pipelines according to claim 1, characterized in that, A cylindrical cavity is coaxially arranged in the inside of the gland (3), and a packing (17) for sealing is filled in the cylindrical cavity.

7. The shut-off valve for bidirectional control of natural gas pipelines according to claim 1, characterized in that, The sealing assembly comprises connecting flanges (18) fixedly arranged on the ends of the air inlet pipe (12) and the air outlet pipe (13) away from the valve body (1), annular sealing grooves (19) are coaxially arranged on the ends of the connecting flanges (18) away from the valve body (1), sealing rings (20) are arranged in the annular sealing grooves (19), the sealing rings (20) are extruded through the connection of the connecting flanges (18) and the pipeline connection end, and the sealing connection of the pipeline with the air inlet pipe (12) and the air outlet pipe (13) is realized.

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