CN110307436B - PVC pipeline afterbody head device - Google Patents

PVC pipeline afterbody head device Download PDF

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Publication number
CN110307436B
CN110307436B CN201910626740.9A CN201910626740A CN110307436B CN 110307436 B CN110307436 B CN 110307436B CN 201910626740 A CN201910626740 A CN 201910626740A CN 110307436 B CN110307436 B CN 110307436B
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pressure
circular plate
ring
pipeline
partial pressure
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CN201910626740.9A
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CN110307436A (en
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周纯
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周纯
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/10Means for stopping flow from or in pipes or hoses
    • F16L55/11Plugs

Abstract

The invention provides a PVC pipeline tail end sealing device which comprises a pipeline body and a tail end sealing head, wherein the tail end sealing head is arranged at the tail part of the pipeline body, the tail end sealing head comprises an outer pipe partial pressure ring, an annular slot, a sealing ring gasket and an inner pipe deformation partial pressure mechanism, the inner wall of the outer pipe partial pressure ring is sleeved with the outer surface of the pipeline body, and the surface of the outer pipe partial pressure ring is inserted into the inner wall of the annular slot. This plugging structure of PVC pipeline afterbody head device design can be in the inside and outside simultaneous action of pipeline, the impact force reinforcing sealed effect and the compactness of connecting with the help of rivers, the impact force of structure is weakened to multistage partial pressure, the life extension, simultaneously through simple mode dismantlement structure that can be quick, thereby effectual general head of having solved need bear great impact force when using, the ability of atress position dispersed pressure is relatively poor, the condition of revealing takes place easily, and the head damages to influence great to the pipeline, the inconvenient problem of repackaging.

Description

PVC pipeline afterbody head device
Technical Field
The invention relates to the technical field of PVC pipelines, in particular to a PVC pipeline tail end sealing device.
Background
The PVC pipeline can be processed into a through shape at two ends in the process of processing into a product, the pipeline is convenient to be communicated and butted with other pipelines through a connecting device and is also convenient to smoothly convey water to the pipeline, some pipelines in the pipeline are used as main pipelines and can be communicated with a plurality of branch pipes on the surface of the pipeline to convey water in different directions, at the moment, a head sealing device for plugging is required to be fixed at the tail end of the main pipeline, the existing commonly used head sealing device is mainly a pipeline which is opened at one end and is made of the same PVC material and is in sealed butt joint with the main pipeline, the pipeline needs to bear the impact of water flow in the use process, the terminal point of the pipeline always bears the impact pressure in the use process, so whether leakage occurs in the head sealing of the pipeline or not in frequent maintenance, and the existing connecting mode is dead and is not fixed through bolts or bonded through welding or strong glue, so that no problem, the end socket damage can be damaged together with the pipeline after long-time use, and the secondary packaging is very inconvenient, the general end socket needs to bear larger impact force when in use, the pressure dispersing capacity of the stress part is poorer, the leakage condition is easy to occur, the influence on the pipeline caused by the end socket damage is larger, and the secondary packaging is inconvenient, so that a PVC pipeline tail end socket device is needed.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a PVC pipeline tail end socket device, which solves the problems that a common end socket needs to bear larger impact force when in use, the pressure dispersing capacity of a stressed part is poorer, leakage is easy to occur, the damage of the end socket has larger influence on a pipeline, and secondary packaging is inconvenient.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: the utility model provides a PVC pipeline afterbody capping device, includes pipeline body and tail end head, the afterbody at the pipeline body is installed to the tail end head, the tail end head includes outside of tubes partial pressure ring, annular slot, sealing ring pad and intraductal deformation bleeder mechanism, the inner wall of outside of tubes partial pressure ring cup joints with the surface of pipeline body, the surface of outside of tubes partial pressure ring is pegged graft with annular slot's inner wall, intraductal deformation bleeder mechanism is located the inside of pipeline body.
Preferably, the pressure-dividing mechanism for deformation in the pipe comprises a water-facing circular plate, a back-pressure circular plate, two middle-pressure circular plates, a gas transmission steel pipe, three sections of corrugated steel pipes, a rotating rope and a cavity limiting mechanism, wherein the water-facing circular plate, the back-pressure circular plate and the two middle-pressure circular plates are made of spring steel, the water-facing circular plate, the back-pressure circular plate and the two middle-pressure circular plates are respectively in a shape of one side being sunken and one side being protruded, the two middle-pressure circular plates are positioned between the back-pressure circular plate and the water-facing circular plate, elastic pressure-dividing cavities are respectively arranged between the water-facing circular plate and the middle-pressure circular plate and between the back-pressure circular plate and the middle-pressure circular plate, elastic extrusion cavities are respectively arranged between the two middle-pressure circular plates, the gas transmission steel pipe and the three sections of corrugated steel pipes are integrally formed, bearings are respectively arranged on the surfaces of the water-facing circular plate, the back-, and an inflation inlet is formed in the surface of the corrugated steel pipe positioned in the elastic extrusion cavity.
Preferably, be located the surface of the inside ripple steel pipe of elasticity partial pressure chamber and the one end fixed connection of rotatory rope, the fixed surface of rotatory rope is connected with the solid partial pressure steel ball of a plurality of, the convex surface of the plectane that faces water, the convex surface of two middling pressure plectanes and the convex surface of backpressure plectane all are provided with central circular slot, the surface of the plectane that faces water, the surface of backpressure plectane and two middling pressure plectanes all with the inner wall fixed connection that the seal ring filled up, the fixed surface of seal ring filled up is connected with two sections elastic sealing rubber pads, two sections elastic sealing rubber pad is located the inside in two different elasticity partial pressure chambers respectively, annular slot sets up on the sunk surface of backpressure plectane.
Preferably, the material of outside of tubes partial pressure ring includes the stainless steel, the side view of outside of tubes partial pressure ring is the annular shape, the cross-sectional view of outside of tubes partial pressure ring is the V-arrangement, the material of gas transmission steel pipe and three-section ripple steel pipe all includes the spring steel, the surface of bearing has cup jointed the seal cover, the sunken face of water-facing plectane is just right with the water impact direction, the sunken face of backpressure plectane is just facing the outside of pipeline body, the protruding face of backpressure plectane and the protruding face of water-facing plectane are just facing the protruding face of two middling pressure plectanes respectively.
Preferably, cavity limiting mechanism is located the inside in elastic extrusion chamber, cavity limiting mechanism includes rubber ball, solid steel ball and divider spring, solid steel ball is located the inside of rubber ball, divider spring's both ends respectively with the surface of solid steel ball and the inner wall fixed connection of rubber ball, the surface mosaic of rubber ball has a plurality of ball, a plurality of spacing distance between the ball is the same, and inside rubber ball, solid steel ball and the divider spring of cavity limiting mechanism can play the effect of sharing pressure on the one hand, and on the other hand solid steel ball can prevent two middling pressure plectanes to take place excessive deformation, a plurality of spacing distance between the ball is the same, and the ball can play and make things convenient for the rubber ball to remove in the intracavity.
Preferably, the surface of the gas transmission steel pipe is fixedly connected with a rotation limiting ring, the surface of the rotation limiting ring is in threaded connection with a limiting bolt, and one end of the limiting bolt is in threaded connection with the surface of the back pressure circular plate.
(III) advantageous effects
(1) When the self-adaptive pipeline body is used, the inner diameter of the tail end head self-adaptive pipeline body is clamped into the pipeline body, the water-facing circular plate is subjected to impact of water flow, the greater the impact of the water flow is, the greater the deformation degree of the water-facing circular plate, the backpressure circular plate and the middle pressure circular plate is, the pressure is guided by the shapes of the water-facing circular plate, the backpressure circular plate and the middle pressure circular plate, the pressure can be transmitted to the inner wall of the pipeline body, the sealing structure is less prone to falling off, meanwhile, the unstable structure in the deformation pressure dividing mechanism in the pipeline can play a role in deforming and sharing the pressure, on one hand, the effect that the connection is tighter and stronger in sealing.
(2) According to the invention, the outer pressure-dividing ring is arranged, so that the inner ring of the outer pressure-dividing ring can be driven to deform and press downwards when the in-pipe deformation pressure-dividing mechanism deforms, the inner ring of the outer pressure-dividing ring presses downwards more tightly the part, sleeved with the outer surface of the pipeline body, of the outer pressure-dividing ring, on one hand, the pipeline body is extruded together with the in-pipe deformation pressure-dividing mechanism, so that the phenomenon of pipe explosion caused by nonuniform stress inside and outside the pipeline can be prevented, and on the other hand, the tight connection with the pipeline body can be realized by means of the reinforcement of the deformation pressure.
(3) When the plugging structure needs to be taken out, only water is needed to be cut off, the external partial pressure ring is taken out from the annular slot without the water flow pressure, then the internal inflation enables the partial pressure deformation mechanism in the pipe to deform, the deformation direction is opposite to the deformation direction of the water flow impact pressure, the extrusion force of the medium pressure circular plate is weakened due to the expansion of the elastic extrusion cavity, the medium pressure circular plate deforms to extrude the solid partial pressure steel ball, the water facing circular plate and the water backing circular plate are extruded and inclined by the solid partial pressure steel ball, the extrusion force is weakened, and the plugging structure is directly taken out.
(4) The plugging structure designed by the invention can act inside and outside a pipeline simultaneously, the sealing effect and the connection tightness are enhanced by means of the impact force of water flow, the impact force of the structure is weakened by multi-stage partial pressure, the service life is prolonged, and meanwhile, the structure can be rapidly disassembled in a simple mode, so that the problems that a common sealing head needs to bear larger impact force when in use, the pressure dispersing capacity of a stressed part is poorer, leakage is easy to occur, the sealing head is damaged, the pipeline is greatly influenced, and the sealing head is inconvenient to be packaged again are effectively solved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view of the end closure of the present invention;
FIG. 3 is an enlarged view of the structure of FIG. 2;
figure 4 is a cross-sectional view of the cavity-defining mechanism of the present invention.
The pipeline comprises a pipeline body 1, a tail end head 2, an outer pressure dividing ring 21, an annular slot 22, a sealing ring gasket 23, a deformation pressure dividing mechanism in a pipe 24, a water-meeting circular plate 241, a back pressure circular plate 242, a middle pressure circular plate 243, a gas transmission steel pipe 244, a corrugated steel pipe 245, a rotating rope 246, a cavity limiting mechanism 247, a rubber ball 2471, a solid steel ball 2472, a pressure dividing spring 2473, a ball 2474, an elastic pressure dividing cavity 248, an elastic extrusion cavity 249, an air charging port 2410, a solid pressure dividing steel ball 2411, a center circular slot 2412, an elastic sealing rubber gasket 2413, a rotation limiting ring 3 and a limiting bolt 4.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-4, an embodiment of the present invention provides a PVC pipeline tail end enclosure device, which includes a pipeline body 1 and a tail end enclosure 2, the tail end enclosure 2 is installed at the tail of the pipeline body 1, the tail end enclosure 2 includes an external pipe partial pressure ring 21, an annular slot 22, a sealing ring gasket 23 and an internal pipe deformation partial pressure mechanism 24, an inner wall of the external pipe partial pressure ring 21 is sleeved with an outer surface of the pipeline body 1, a surface of the external pipe partial pressure ring 21 is inserted into an inner wall of the annular slot 22, the internal pipe deformation partial pressure mechanism 24 is located inside the pipeline body 1, the external pipe partial pressure ring 21 is made of stainless steel, a side view of the external pipe partial pressure ring 21 is in a circular ring shape, and a cross-sectional.
The internal deformation pressure-dividing mechanism 24 comprises a water-facing circular plate 241, a back-pressure circular plate 242, two medium-pressure circular plates 243, an air-conveying steel pipe 244, three corrugated steel pipes 245, a rotating rope 246 and a cavity limiting mechanism 247, wherein the water-facing circular plate 241, the back-pressure circular plate 242 and the two medium-pressure circular plates 243 are made of spring steel, the water-facing circular plate 241, the back-pressure circular plate 242 and the two medium-pressure circular plates 243 are respectively in a shape with one concave side and one convex side, the two medium-pressure circular plates 243 are positioned between the back-pressure circular plate 242 and the water-facing circular plate 241, the concave side of the water-facing circular plate 241 is opposite to the water impact direction, the concave side of the back-pressure circular plate 242 is opposite to the outside of the pipeline body 1, the convex side of the back-pressure circular plate 242 and the convex side of the water-facing circular plate 241 are respectively opposite to the convex sides of the two medium-pressure circular plates 243, elastic pressure cavities 248 are, the gas transmission steel pipe 244 and the three-section corrugated steel pipe 245 are integrally formed, bearings are arranged on the surfaces of the water-facing circular plate 241, the back pressure circular plate 242 and the middle pressure circular plate 243, the surface of the gas transmission steel pipe 244 is fixedly connected with inner rings of the bearings, the materials of the gas transmission steel pipe 244 and the three-section corrugated steel pipe 245 comprise spring steel, sealing sleeves are sleeved on the surfaces of the bearings, the three-section corrugated steel pipe 245 is respectively located inside the two elastic pressure division cavities 248 and the elastic extrusion cavity 249, an air inflation inlet 2410 is formed in the surface of the corrugated steel pipe 245 located inside the elastic extrusion cavity 249, the surface of the gas transmission steel pipe 244 is fixedly connected with the limit ring 3, the surface of the limit ring 3 is in threaded connection with the limit bolt 4, and one end of the limit bolt 4.
The surface of a corrugated steel pipe 245 positioned in the elastic pressure division cavity 248 is fixedly connected with one end of a rotating rope 246, the surface of the rotating rope 246 is fixedly connected with a plurality of solid pressure division steel balls 2411, the convex surfaces of the water-facing circular plate 241, the convex surfaces of the two medium pressure circular plates 243 and the convex surface of the back pressure circular plate 242 are respectively provided with a central circular groove 2412, the surfaces of the water-facing circular plate 241, the back pressure circular plate 242 and the two medium pressure circular plates 243 are respectively and fixedly connected with the inner wall of the sealing ring gasket 23, the surface of the sealing ring gasket 23 is fixedly connected with two sections of elastic sealing rubber gaskets 2413, the two sections of elastic sealing rubber gaskets 2413 are respectively positioned in the two different elastic pressure division cavities 248, and the annular slot 22 is arranged on the concave.
The cavity limiting mechanism 247 is located inside the elastic extrusion cavity 249, the cavity limiting mechanism 247 comprises a rubber ball 2471, a solid steel ball 2472 and a pressure dividing spring 2473, the solid steel ball 2472 is located inside the rubber ball 2471, two ends of the pressure dividing spring 2473 are respectively fixedly connected with the surface of the solid steel ball 2472 and the inner wall of the rubber ball 2471, a plurality of balls 2474 are inlaid on the surface of the rubber ball 2471, and the spacing distances among the balls 2474 are the same.
When the pipeline is used, water stops inside the pipeline body 1, the deformation pressure-dividing mechanism 24 in the pipeline is plugged into the pipeline body 1, the outer pressure-dividing ring 21 is inserted into the annular slot 22, the inner wall of the outer pressure-dividing ring 21 is sleeved with the surface of the pipeline body 1, the sealing ring gasket 23 and the elastic sealing rubber gasket 2413 are attached to the inner wall of the pipeline body 1, the gas transmission steel pipe 244 is rotated, the gas transmission steel pipe 244 drives the rotating rope 246 to wind, the rotating rope 246 drives the solid pressure-dividing steel ball 2411 to ascend and to be cut into the central circular groove 2412, then the limiting bolt 4 is in threaded connection with the back pressure circular plate 242, water flows inside the pipeline body 1, the water flow impacts the water circular plate 241, the water-facing circular plate is deformed by stress 241 and transmits pressure to the medium pressure circular plate 243 through the solid pressure-dividing steel ball 2411, the medium pressure circular plate 243 compresses the elastic extrusion cavity 249, the medium pressure circular plate 243 extrud, the back pressure circular plate 242 and the middle pressure circular plate 243 are deformed and tightly press the sealing ring gasket 23 and transmit the pressure from the inside to the inner wall of the pipeline body 1, meanwhile, the deformed back pressure circular plate 242 presses the outer partial pressure ring 21, the inner wall of the outer partial pressure ring 21 tightly presses the outer surface of the pipeline body 1 downwards, when the device needs to be separated, the inside of the pipeline body 1 stops water, the outer partial pressure ring 21 is separated from the annular slot 22, only the limit bolt 4 needs to be separated from the back pressure circular plate 242, the gas transmission steel pipe 244 is rotated, the solid partial pressure steel ball 2411 hangs down and is superposed at the bottom of the elastic partial pressure cavity 248, the gas transmission steel pipe 244 and the gas charging opening 2410 are used for charging gas into the elastic extrusion cavity 249, the cavity limiting mechanism 247 expands from the inside to the outside to deform and reduce the pressure on the sealing ring gasket 23, and simultaneously, the expanded middle pressure circular plate 243 presses the water 241 and the back pressure circular plate 242 at the bottom of the elastic partial pressure, the back pressure circular plate 242 and the water-facing circular plate 241 weaken the pressure on the sealing ring gasket 23, and then the device can be easily taken out, thereby completing the use process of the whole PVC pipeline tail end sealing device.

Claims (3)

1. The utility model provides a PVC pipeline afterbody head device which characterized in that: the pipeline comprises a pipeline body (1) and a tail end sealing head (2), wherein the tail end sealing head (2) is installed at the tail of the pipeline body (1), the tail end sealing head (2) comprises an outer pipe partial pressure ring (21), an annular slot (22), a sealing ring gasket (23) and an inner pipe deformation partial pressure mechanism (24), the inner wall of the outer pipe partial pressure ring (21) is sleeved with the outer surface of the pipeline body (1), the surface of the outer pipe partial pressure ring (21) is inserted into the inner wall of the annular slot (22), and the inner pipe deformation partial pressure mechanism (24) is located inside the pipeline body (1);
the intraductal deformation partial pressure mechanism (24) includes meeting water plectane (241), back pressure plectane (242), two middling pressure plectanes (243), gas transmission steel pipe (244), three-section ripple steel pipe (245), rotation rope (246) and cavity limiting mechanism (247), the material of meeting water plectane (241), back pressure plectane (242) and two middling pressure plectanes (243) all includes the spring steel, meet water plectane (241), back pressure plectane (242) and two middling pressure plectanes (243) all are one side sunken one side convex form, two middling pressure plectanes (243) are located between back pressure plectane (242) and meeting water plectane (241), all be provided with elasticity partial pressure chamber (248) between meeting water plectane (241) and middling pressure plectane (243) and between back pressure plectane (242) and middling pressure plectane (243), be provided with elasticity extrusion chamber (249) between two middling, the gas transmission steel pipe (244) and the three sections of corrugated steel pipes (245) are integrally formed, bearings are arranged on the surfaces of the water-facing circular plate (241), the back pressure circular plate (242) and the middle pressure circular plate (243), the surface of the gas transmission steel pipe (244) is fixedly connected with the inner ring of the bearing, the three sections of corrugated steel pipes (245) are respectively positioned inside the two elastic pressure division cavities (248) and the elastic extrusion cavity (249), and the surface of the corrugated steel pipe (245) positioned inside the elastic extrusion cavity (249) is provided with an air inflation inlet (2410);
the surface of a corrugated steel pipe (245) positioned in an elastic pressure division cavity (248) is fixedly connected with one end of a rotating rope (246), the surface of the rotating rope (246) is fixedly connected with a plurality of solid pressure division steel balls (2411), the convex surfaces of a water-facing circular plate (241), the convex surfaces of two medium pressure circular plates (243) and the convex surface of a back pressure circular plate (242) are respectively provided with a central circular groove (2412), the surfaces of the water-facing circular plate (241), the back pressure circular plate (242) and the two medium pressure circular plates (243) are respectively and fixedly connected with the inner wall of a sealing ring gasket (23), the surface of the sealing ring gasket (23) is fixedly connected with two sections of elastic sealing rubber gaskets (2413), the two sections of elastic sealing rubber gaskets (2413) are respectively positioned in two different elastic pressure division cavities (248), and an annular slot (22) is formed in the concave surface of the back pressure circular plate (242);
the material of the outer pipe partial pressure ring (21) comprises stainless steel, the side view of the outer pipe partial pressure ring (21) is in a ring shape, and the cross section of the outer pipe partial pressure ring (21) is in a V shape;
the gas transmission steel pipe (244) and the three-section corrugated steel pipe (245) are made of spring steel, and the surface of the bearing is sleeved with a sealing sleeve;
the concave surface of the water-facing circular plate (241) is opposite to the water impact direction, and the concave surface of the back pressure circular plate (242) is opposite to the outside of the pipeline body (1);
the protruding surfaces of the back pressure circular plate (242) and the water-facing circular plate (241) respectively face the protruding surfaces of the two medium pressure circular plates (243).
2. The PVC pipeline tail head device of claim 1, characterized in that: the cavity limiting mechanism (247) is located inside the elastic extrusion cavity (249), the cavity limiting mechanism (247) comprises a rubber ball (2471), a solid steel ball (2472) and a pressure dividing spring (2473), the solid steel ball (2472) is located inside the rubber ball (2471), two ends of the pressure dividing spring (2473) are fixedly connected with the surface of the solid steel ball (2472) and the inner wall of the rubber ball (2471), a plurality of balls (2474) are inlaid in the surface of the rubber ball (2471), and the spacing distances among the balls (2474) are the same.
3. The PVC pipeline tail head device of claim 1, characterized in that: the surface of the gas transmission steel pipe (244) is fixedly connected with a rotation limiting ring (3), the surface of the rotation limiting ring (3) is in threaded connection with a limiting bolt (4), and one end of the limiting bolt (4) is in threaded connection with the surface of the back pressure circular plate (242).
CN201910626740.9A 2019-07-11 2019-07-11 PVC pipeline afterbody head device Active CN110307436B (en)

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Application Number Priority Date Filing Date Title
CN201910626740.9A CN110307436B (en) 2019-07-11 2019-07-11 PVC pipeline afterbody head device

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Application Number Priority Date Filing Date Title
CN201910626740.9A CN110307436B (en) 2019-07-11 2019-07-11 PVC pipeline afterbody head device

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CN110307436B true CN110307436B (en) 2021-06-04

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112944096A (en) * 2021-02-05 2021-06-11 陈琼 Pipeline end socket device for energy-saving and environment-friendly equipment
CN113175582B (en) * 2021-04-25 2022-07-15 河北尚恒管道制造有限公司 Natural gas line shutoff connecting device

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CN205824474U (en) * 2016-07-21 2016-12-21 傅迪 Buckle-type pipe end socket
CN208753934U (en) * 2018-07-25 2019-04-16 国家电网有限公司 A kind of seal for pipe joints plug

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Publication number Priority date Publication date Assignee Title
CN201293164Y (en) * 2008-10-27 2009-08-19 上海梅山钢铁股份有限公司 Quickly connecting and plugging pipe joint
CN103174907A (en) * 2013-03-21 2013-06-26 中国华冶科工集团有限公司 Pipeline built-in sealing device
EP2793011A1 (en) * 2013-04-05 2014-10-22 Ipm S.R.L. Testing system for the operation of the tightness seal and bell of a pvc-type plastic material pipe, obtained by a forming process with integrated seal
CN203847907U (en) * 2014-05-19 2014-09-24 永新电气设备有限公司 Flexible blocking device for pipeline
CN205824474U (en) * 2016-07-21 2016-12-21 傅迪 Buckle-type pipe end socket
CN208753934U (en) * 2018-07-25 2019-04-16 国家电网有限公司 A kind of seal for pipe joints plug

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