CN110107705B - Gate valve seat and knife gate valve using same - Google Patents
Gate valve seat and knife gate valve using same Download PDFInfo
- Publication number
- CN110107705B CN110107705B CN201910490518.0A CN201910490518A CN110107705B CN 110107705 B CN110107705 B CN 110107705B CN 201910490518 A CN201910490518 A CN 201910490518A CN 110107705 B CN110107705 B CN 110107705B
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- valve
- valve seat
- valve body
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- 239000002184 metal Substances 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000007789 sealing Methods 0.000 claims abstract description 8
- 238000009434 installation Methods 0.000 claims abstract description 6
- 230000002787 reinforcement Effects 0.000 claims abstract description 5
- 238000011144 upstream manufacturing Methods 0.000 claims description 46
- 239000012530 fluid Substances 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 229920002943 EPDM rubber Polymers 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000002002 slurry Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
- F16K3/0281—Guillotine or blade-type valves, e.g. no passage through the valve member
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
Abstract
The invention discloses a gate valve seat and a knife gate valve using the same, belongs to the technical field of valves, and solves the problems of poor sealing performance and unstable installation of a traditional gate valve. The valve mainly comprises two sub valve seats, wherein each sub valve seat comprises an annular body, a buffer groove is formed in the annular body along the circumferential direction of the annular body, extends towards the upper end face of the annular body and penetrates through the upper end face of the annular body to form an installation groove; a plurality of short cross beams which are distributed at intervals and play a role in reinforcement are arranged in the buffer groove, and a metal ring which plays a role in support is arranged in the annular body; the valve seat also comprises a knife gate valve applying the valve seat. The invention has smart structural design, ingenious structural design and simple assembly relation, and the assembly process of the valve body and the valve seat is simple and easy to operate, thereby being beneficial to improving the production efficiency of the knife gate valve; the practicability is very strong, two problems of tightness and assembly relation of the traditional gate valve are synchronously solved, and the gate valve has important significance in the technical field of gate valves.
Description
Technical Field
The invention belongs to the technical field of valves, and particularly relates to a gate valve seat and a knife-type gate valve using the same, wherein the gate valve seat has the advantages of ingenious structural design, strong sealing performance, firm assembly of a valve body and a valve seat and simple and feasible assembly process of the valve body and the valve seat.
Background
The knife gate valve is also called knife gate valve, slurry valve and slurry valve, its opening and closing member is a gate plate, and the moving direction of the gate plate is perpendicular to fluid direction, and the knife edge gate plate is used for cutting off medium. The knife-type gate valve mainly comprises a valve body, a closing member, a valve rod and a valve seat, wherein the valve body is provided with a middle cavity, an upstream flow channel and a downstream flow channel which are respectively arranged at two sides of the middle cavity, a valve rod mounting groove which is perpendicular to the axis of the upstream flow channel and the downstream flow channel and is communicated with the middle cavity of the valve body, the valve body in the upstream flow channel is an upstream valve body, and the valve body in the downstream flow channel is a downstream valve body; the closing member has a planar outer surface, is arranged in the middle cavity of the valve body and can slide linearly relative to the valve body for opening and closing or regulating the flow, pressure or temperature of fluid flowing through the valve; the lower end of the valve rod passes through the valve rod mounting groove of the valve body and stretches into the middle cavity of the valve body to be connected with the top end of the closing piece, and the other end of the valve rod is exposed out of the valve body to be connected with a device for driving the valve. The design of the valve seat is very critical, and the good structural design of the valve seat determines the sealing performance of the whole knife gate valve. In order to ensure enough strength and prevent the valve seat from deforming under the impact of a closing member, the traditional valve seat is designed to be of a solid structure; then, forming a groove on the inner side wall of the valve body, and plugging the valve seat into the groove; at the same time this is the mounting relationship of the valve seat to the valve body. The traditional knife gate valve is easy to generate a medium leakage phenomenon, and the reason is that the closing member is spread apart from two opposite sub-valve seats in the downward movement process, larger stress can be generated on the sub-valve seats in the impact process, the stress can not be released in the valve seats designed by the solid structure, and the stress is transmitted to the end faces of the sub-valve seats to cause a gap between the inner end faces of the sub-valve seats and the closing member, so that the knife gate valve is caused to generate the leakage phenomenon. In addition, the assembly of the traditional valve seat and the valve body is not firm, the valve seat is laterally plugged into a groove on the side wall of the valve body, and the disassembly and assembly stress direction of the valve seat is the same as or opposite to the flow direction of a medium, so that the flow pressure of the medium greatly affects the assembly tightness of the valve seat, and under the condition that the flow pressure of the medium is large, one of the sub-valve seats is in risk of being washed away.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the gate valve seat and the knife gate valve using the same, which have the advantages of ingenious structural design, strong sealing performance, firm assembly of the valve body and the valve seat, and simple and easy assembly process of the valve body and the valve seat.
The invention is realized by the following technical scheme:
the valve seat of the gate valve is a pair of sealing pairs formed by two sub-valve seats with identical structures, the sub-valve seat comprises an annular body, a buffer groove is formed in the annular body along the circumferential direction of the annular body, and the buffer groove extends to the upper end surface of the annular body and penetrates through the upper end surface of the annular body to form an installation groove; a plurality of short cross beams which are distributed at intervals and play a role in reinforcement are arranged in the buffer groove; the annular body is internally provided with a metal ring which plays a supporting role.
Preferably, the two ends of the short cross beam are fixedly connected to the inner side wall of the buffer groove, and the bottom end of the short cross beam is fixedly connected to the bottom surface of the buffer groove.
Preferably, the buffer groove is in an inverted trapezoid shape, and the upper inner corner of the buffer groove is a right angle; the inner upper corner of the metal ring is also a right angle, and the inner upper corner of the metal ring is tightly attached to the inner upper corner of the buffer groove.
Preferably, the central axis of the short cross beam is parallel to the central axis of the sub valve seat 1.
Preferably, the short cross beams are uniformly distributed along the circumferential direction of the buffer groove in an equal scale.
Preferably, the junction of the upper end face of the sub valve seat and the inner end face of the sub valve seat is designed into a chamfer structure.
Preferably, the inner end surface of the sub valve seat is wavy.
Preferably, the valve seat is made of EPDM.
A knife gate valve comprises a valve body, a closing member and a valve rod;
the valve body is provided with a middle cavity, an upstream flow channel and a downstream flow channel which are respectively arranged at two sides of the middle cavity, and a valve rod mounting groove which is perpendicular to the axis of the upstream flow channel and the downstream flow channel and is communicated with the middle cavity of the valve body, wherein the valve body in the upstream flow channel is an upstream valve body, and the valve body in the downstream flow channel is a downstream valve body;
the outer surface of the closing member is a plane, is arranged in the middle cavity of the valve body and can slide linearly relative to the valve body for opening and closing or regulating the flow, pressure or temperature of fluid flowing through the valve;
the lower end of the valve rod passes through the valve rod mounting groove of the valve body and stretches into the middle cavity of the valve body to be connected with the top end of the closing piece, and the other end of the valve rod is exposed out of the valve body to be connected with a device for driving the valve; the knife gate valve is provided with the gate valve seat;
the sub valve seat fixedly assembled on the upstream valve body is an upstream valve seat, the sub valve seat fixedly assembled on the downstream valve body is a downstream valve seat, and the upstream valve seat is opposite to the inner side end surface of the downstream valve body;
the upstream valve body is fixedly provided with a convex ring matched with the mounting groove of the upstream valve seat, and the convex ring is clamped in the mounting groove under the action of tension of the upstream valve seat;
the downstream valve body is fixedly provided with a protruding ring matched with the mounting groove of the downstream valve seat, and the protruding ring is clamped in the mounting groove under the action of tension of the downstream valve seat.
Compared with the prior art, the invention has the beneficial effects that:
the invention has ingenious structural design, and the high tightness and firm assembly relation are synchronously realized on the basis of ensuring the structural strength of the valve seat by ingenious structural design; the synchronous design of the buffer groove and the metal ring not only effectively releases the excessive stress brought by the opening and closing piece, but also effectively ensures the structural strength of the valve seat, the opening and closing piece can generate larger impact force in the falling process, and the metal piece has the function of resisting the impact force and preventing the impact force from deforming the valve seat; the valve seat disassembly and assembly stress direction is perpendicular to the medium flow pressure direction, namely the medium flow pressure does not influence the assembly relation between the valve seat and the valve body, and the assembly relation between the valve seat and the valve body is very firm;
the invention has simple assembly relation, simple assembly process of the valve body and the valve seat, easy operation and contribution to improving the production efficiency of the knife gate valve;
the invention has strong practicability, solves two problems of tightness and assembly relation of the traditional gate valve synchronously, and has important significance in the technical field of gate valves.
Drawings
FIG. 1 is a schematic view of a valve seat and sub-seat structure of a gate valve of the present invention;
FIG. 2 is a cross-sectional view taken along the direction of FIG. 1A-A of the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 1 in accordance with the present invention;
FIG. 4 is a schematic view of the knife gate valve of the present invention;
FIG. 5 is a left side view of the present invention;
fig. 6 is a right side view of the present invention.
In the figure: 1. a sub-valve seat; 2. an annular body; 3. a buffer groove; 4. a mounting groove; 5. a short cross beam; 6. a metal ring; 7. an inner end surface; 8. a chamfering structure; 9. a closing member; 10. a valve stem; 11. an upstream valve body; 12. a downstream valve body; 13. an upstream valve seat; 14. a downstream valve seat; 15. a raised ring.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
the valve seat of the gate valve is a pair of sealing pairs formed by two sub-valve seats 1 with identical structures, the sub-valve seat 1 comprises an annular body 2, a buffer groove 3 is formed in the annular body 2 along the circumferential direction of the annular body 2, and the buffer groove 3 extends towards the upper end surface of the annular body 2 and penetrates through the upper end surface of the annular body 2 to form an installation groove 4; a plurality of short cross beams 5 which are distributed at intervals and play a role in reinforcement are arranged in the buffer groove 3; a metal ring 6 with supporting function is arranged in the annular body 2.
Preferably, two ends of the short cross beam 5 are fixedly connected to the inner side wall of the buffer groove 3, and the bottom end of the short cross beam 5 is fixedly connected to the bottom surface of the buffer groove 3. The short cross member 5 is designed to increase the structural strength of the valve seat.
Preferably, the buffer groove 3 has an inverted trapezoid shape, and the upper inner corner of the buffer groove is a right angle; the inner upper corner of the metal ring 6 is also a right angle, and the inner upper corner of the metal ring 6 is tightly attached to the inner upper corner of the buffer groove 3. The structural design is beneficial to the metal ring to exert the function of increasing the strength to the maximum.
Preferably, the central axis of the short cross beam 5 is parallel to the central axis of the sub valve seat 1. The structural design is beneficial to the short cross beam to exert the function of increasing the strength to the maximum.
Preferably, the short cross beams 5 are uniformly distributed uniformly along the circumferential direction of the buffer groove 3. The even distribution makes the sub-valve seat structure symmetrical.
Preferably, the junction of the upper end surface of the sub-valve seat 1 and the inner end surface 7 thereof is designed as a chamfer structure 8. The chamfer design is in order to reduce the resistance that the piece falls of opening and close, prevents that the resistance is too big, closes inefficacy.
Preferably, the inner end surface 7 of the sub valve seat 1 is wavy. The wave structure design can increase the airtight performance of the product on the one hand, and on the other hand reduces the resistance of falling of the opening and closing piece on the basis that the airtight performance of the valve seat is not influenced, and the product is flexible in operation and high in use comfort level for users.
Preferably, the valve seat is made of EPDM.
A knife gate valve comprises a valve body, a closing member 9 and a valve rod 10; the valve body is provided with a middle cavity, an upstream circulation channel and a downstream circulation channel which are respectively arranged at two sides of the middle cavity, and a valve rod mounting groove which is perpendicular to the axis of the upstream circulation channel and the downstream circulation channel and is communicated with the middle cavity of the valve body, wherein the valve body in the upstream circulation channel is an upstream valve body 11, and the valve body in the downstream circulation channel is a downstream valve body 12;
the outer surface of the closing member 9 is a plane, is arranged in the middle cavity of the valve body and can slide linearly relative to the valve body for opening and closing or regulating the flow, pressure or temperature of fluid flowing through the valve;
the lower end of the valve rod 10 passes through the valve rod mounting groove of the valve body and stretches into the middle cavity of the valve body to be connected with the top end of the closing piece 9, and the other end of the valve rod is exposed out of the valve body to be connected with a device for driving the valve; the knife gate valve employs the gate valve seat of any one of claims 1 to 8;
the sub valve seat 1 fixedly assembled on the upstream valve body 11 is an upstream valve seat 13, the sub valve seat 1 fixedly assembled on the downstream valve body 12 is a downstream valve seat 14, and the upstream valve seat 13 is arranged opposite to the inner side end surface 7 of the downstream valve body 12;
the upstream valve body 11 is fixedly provided with a raised ring 15 matched with the mounting groove 4 of the upstream valve seat 13, and the raised ring 15 is clamped in the mounting groove 4 under the tension action of the upstream valve seat 13;
the downstream valve body 12 is fixedly provided with a raised ring 15 matched with the mounting groove 4 of the downstream valve seat 14, and the raised ring 15 is clamped in the mounting groove 4 under the tension action of the downstream valve seat 14.
Example 1:
a knife gate valve comprises a valve body, a closing member 9 and a valve rod 10; the valve body is provided with a middle cavity, an upstream flow channel and a downstream flow channel which are respectively arranged at two sides of the middle cavity, a valve rod mounting groove which is perpendicular to the axis of the upstream flow channel and the downstream flow channel and is communicated with the middle cavity of the valve body, the valve body in the upstream flow channel is an upstream valve body 11, and the valve body in the downstream flow channel is a downstream valve body 12; the outer surface of the closing member 9 is a plane, is arranged in the middle cavity of the valve body and can slide linearly relative to the valve body for opening and closing or regulating the flow, pressure or temperature of fluid flowing through the valve; the lower end of the valve rod 10 passes through the valve rod mounting groove of the valve body and extends into the middle cavity of the valve body to be connected with the top end of the closing member 9, and the other end of the valve rod is exposed out of the valve body to be connected with a device for driving the valve.
The knife gate valve of the embodiment applies a gate valve seat; the valve seat is a pair of sealing pairs formed by two sub valve seats 1 with identical structures, the sub valve seat 1 comprises an annular body 2, a buffer groove 3 is formed in the annular body 2 along the circumferential direction of the annular body 2, and the buffer groove 3 extends to the upper end face of the annular body 2 and penetrates through the upper end face of the annular body 2 to form an installation groove 4; a plurality of short cross beams 5 which are distributed at intervals and play a role in reinforcement are arranged in the buffer groove 3; the two ends of the short cross beam 5 are fixedly connected to the inner side wall of the buffer groove 3, the bottom end of the short cross beam 5 is fixedly connected to the bottom surface of the buffer groove 3, the central axis of the short cross beam 5 is parallel to the central axis of the sub valve seat 1, and the short cross beams 5 are uniformly distributed along the circumferential direction of the buffer groove 3 in an equal scale; the joint of the upper end surface of the sub valve seat 1 and the inner end surface 7 thereof is designed as a chamfer structure 8; a metal ring 6 for supporting is arranged in the annular body 2. The sub valve seat 1 fixedly assembled on the upstream valve body 11 is an upstream valve seat 13, the sub valve seat 1 fixedly assembled on the downstream valve body 12 is a downstream valve seat 14, and the upstream valve seat 13 is opposite to the inner end face 7 of the downstream valve body 12; the upstream valve body 11 is fixedly provided with a raised ring 15 matched with the mounting groove 4 of the upstream valve seat 13, and the raised ring 15 is clamped in the mounting groove 4 under the tension of the upstream valve seat 13; the downstream valve body 12 is fixedly provided with a raised ring 15 matched with the mounting groove 4 of the downstream valve seat 14, and the raised ring 15 is clamped in the mounting groove 4 under the tension of the downstream valve seat 14.
The synchronous design of the buffer groove and the metal ring synchronously realizes high tightness and firm assembly relation on the basis of ensuring the structural strength of the valve seat;
in the aspect of tightness, the buffer groove and the mounting groove provide a stress release space for the valve seat, so that the excessive stress brought by the opening and closing piece is effectively released, the stress is released, the excessive stress on the inner side end surface of the sub valve seat can not generate a gap with the opening and closing piece, and the tightness is very good;
the metal ring hidden in the buffer groove effectively ensures the structural strength of the valve seat; the opening and closing piece can generate larger impact force in the falling process, and the metal piece has the function of resisting the impact force and preventing the impact force from deforming the valve seat;
meanwhile, the disassembly and assembly stress direction of the valve seat is perpendicular to the medium flow pressure direction, namely the medium flow pressure does not influence the assembly relation between the valve seat and the valve body, and the assembly relation between the valve seat and the valve body is very firm.
The embodiment has ingenious structural design, skillfully structural design and simple assembly relation, and the assembly process of the valve body and the valve seat is simple and easy to operate, thereby being beneficial to improving the production efficiency of the knife gate valve; the practicability is very strong, two problems of tightness and assembly relation of the traditional gate valve are synchronously solved, and the gate valve has important significance in the technical field of gate valves.
Example 2:
in the embodiment, the buffer groove 3 is in an inverted trapezoid shape on the basis of the embodiment 1, and the inner upper corner of the buffer groove is a right angle; the inner upper corner of the metal ring 6 is also a right angle, and the inner upper corner of the metal ring 6 is tightly attached to the inner upper corner of the buffer groove 3. The structural design is beneficial to the metal ring to exert the function of increasing the strength to the maximum. In this embodiment, the metal ring 6 is placed in advance, and then the material in a liquid state is injected, followed by solidification molding.
The inner end surface 7 of the valve seat 1 of this embodiment is wavy. The wave structure design can increase the airtight performance of the product on the one hand, and on the other hand reduces the resistance of falling of the opening and closing piece on the basis that the airtight performance of the valve seat is not influenced, and the product is flexible in operation and high in use comfort level for users.
In summary, the present invention is not limited to the preferred embodiments, but includes all equivalent changes and modifications in shape, construction, characteristics and spirit according to the scope of the claims.
Claims (4)
1. A knife gate valve comprises a valve body, a closing member and a valve rod;
the valve body is provided with a middle cavity, an upstream flow channel and a downstream flow channel which are respectively arranged at two sides of the middle cavity, and a valve rod mounting groove which is perpendicular to the axis of the upstream flow channel and the downstream flow channel and is communicated with the middle cavity of the valve body, wherein the valve body in the upstream flow channel is an upstream valve body, and the valve body in the downstream flow channel is a downstream valve body;
the outer surface of the closing member is a plane, is arranged in the middle cavity of the valve body and can slide linearly relative to the valve body for opening and closing or regulating the flow, pressure or temperature of fluid flowing through the valve;
the lower end of the valve rod passes through the valve rod mounting groove of the valve body and stretches into the middle cavity of the valve body to be connected with the top end of the closing piece, and the other end of the valve rod is exposed out of the valve body to be connected with a device for driving the valve; the method is characterized in that: the knife gate valve is provided with a gate valve seat;
the sub valve seat fixedly assembled on the upstream valve body is an upstream valve seat, the sub valve seat fixedly assembled on the downstream valve body is a downstream valve seat, and the upstream valve seat is opposite to the inner side end surface of the downstream valve body;
the upstream valve body is fixedly provided with a convex ring matched with the mounting groove of the upstream valve seat, and the convex ring is clamped in the mounting groove under the action of tension of the upstream valve seat;
the downstream valve body is fixedly provided with a convex ring matched with the mounting groove of the downstream valve seat, and the convex ring is clamped in the mounting groove under the action of the tension of the downstream valve seat;
the valve seat is a pair of sealing pairs formed by two sub valve seats with identical structures, the sub valve seat comprises an annular body, a buffer groove is formed in the annular body along the circumferential direction of the annular body, and the buffer groove extends to the upper end face of the annular body and penetrates through the upper end face of the annular body to form an installation groove; a plurality of short cross beams which are distributed at intervals and play a role in reinforcement are arranged in the buffer groove; a metal ring with supporting function is arranged in the annular body;
the buffer groove is in an inverted trapezoid shape, and the inner upper corner of the buffer groove is a right angle; the inner upper corner of the metal ring is also a right angle, and the inner upper corner of the metal ring is tightly attached to the inner upper corner of the buffer groove; the joint of the upper end face of the sub valve seat and the inner end face of the sub valve seat is designed into a chamfer structure; the inner side end surface of the sub valve seat is wavy; the valve seat is made of EPDM.
2. The knife gate valve of claim 1, wherein: the two ends of the short cross beam are fixedly connected to the inner side wall of the buffer groove, and the bottom end of the short cross beam is fixedly connected to the bottom surface of the buffer groove.
3. The knife gate valve of claim 1, wherein: the central axis of the short cross beam is parallel to the central axis of the sub valve seat.
4. A knife gate valve according to claim 3, characterised in that: the short cross beams are uniformly distributed along the circumferential direction of the buffer groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910490518.0A CN110107705B (en) | 2019-06-06 | 2019-06-06 | Gate valve seat and knife gate valve using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910490518.0A CN110107705B (en) | 2019-06-06 | 2019-06-06 | Gate valve seat and knife gate valve using same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110107705A CN110107705A (en) | 2019-08-09 |
| CN110107705B true CN110107705B (en) | 2024-04-09 |
Family
ID=67494104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910490518.0A Active CN110107705B (en) | 2019-06-06 | 2019-06-06 | Gate valve seat and knife gate valve using same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110107705B (en) |
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| CN108071799A (en) * | 2016-11-17 | 2018-05-25 | 天津市忠利天成阀门有限公司 | A kind of corrosion-resistant seal washer of composite |
| CN206682296U (en) * | 2017-03-21 | 2017-11-28 | 青岛强龙电力石化配件有限公司 | Shelving sealing ring |
| KR20180129145A (en) * | 2017-05-25 | 2018-12-05 | 피피아이평화 주식회사 | Packing for pipe sealing and pipe assembly having the same |
| CN107152548A (en) * | 2017-06-04 | 2017-09-12 | 江苏圣迪德智能科技有限公司 | A kind of industrial pipeline antirust valve |
| CN210128090U (en) * | 2019-06-06 | 2020-03-06 | 泰州市百冠泵阀科技有限公司 | Gate valve disk seat and use its sword type gate valve |
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| CN110107705A (en) | 2019-08-09 |
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