CN116357748A - High-temperature elastic butterfly valve with metal double-ring sealing ring - Google Patents

High-temperature elastic butterfly valve with metal double-ring sealing ring Download PDF

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Publication number
CN116357748A
CN116357748A CN202310187082.4A CN202310187082A CN116357748A CN 116357748 A CN116357748 A CN 116357748A CN 202310187082 A CN202310187082 A CN 202310187082A CN 116357748 A CN116357748 A CN 116357748A
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CN
China
Prior art keywords
ring
valve body
valve
double
valve rod
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310187082.4A
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Chinese (zh)
Inventor
韩孝义
赵力强
汪伟
张惠龙
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Shazhou Valve Co ltd
Original Assignee
Jiangsu Shazhou Valve Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangsu Shazhou Valve Co ltd filed Critical Jiangsu Shazhou Valve Co ltd
Priority to CN202310187082.4A priority Critical patent/CN116357748A/en
Publication of CN116357748A publication Critical patent/CN116357748A/en
Pending legal-status Critical Current

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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
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
    • F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
    • F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
    • F16K1/226—Shaping or arrangements of the sealing
    • F16K1/2263—Shaping or arrangements of the sealing the sealing being arranged on the valve seat
    • 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
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • 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
    • F16K41/00—Spindle sealings
    • F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
    • F16K41/023—Spindle sealings with stuffing-box ; Sealing rings for spindles which only rotate, i.e. non-rising spindles

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lift Valve (AREA)

Abstract

The invention discloses a high-temperature elastic butterfly valve with a metal double-ring sealing ring, which comprises a valve body, an upper valve rod, a valve plate, a lower valve rod and a driving assembly, wherein the valve body is provided with a valve seat; the valve body is provided with a pressing ring, a convex ring embedded in the valve body is arranged on the pressing ring, an annular mounting groove is formed in one side, close to the valve body, of an outer ring of the convex ring, a double-ring sealing ring is clamped on the convex ring, the double-ring sealing ring comprises an outer ring clamped in the annular mounting groove, an inner ring clamped in the convex ring and a connecting part for connecting the outer ring and the inner ring, and a single-ring sealing ring is arranged on one side, far away from the valve body, of the inner ring in the convex ring; the part of the lower valve rod lower extreme that wears out the valve body is close to being equipped with annular spacing recess on the periphery of valve body terminal surface, and the upper and lower both sides lateral wall of spacing recess all is the inclined plane, and the valve body lower extreme is connected with the tail end lid that covers the lower valve rod, and the tail end is covered and is equipped with annular constant head tank, and the activity is equipped with elasticity in the annular constant head tank and is split the ring, and elasticity split the ring cover is established in lower valve rod periphery, and the tail end is covered and is equipped with the graphite ring at elasticity split ring periphery.

Description

High-temperature elastic butterfly valve with metal double-ring sealing ring
Technical Field
The invention relates to a high-temperature elastic butterfly valve with a metal double-ring sealing ring.
Background
The conventional high-temperature butterfly valve is generally in a three-eccentric structure, and when the temperature difference of a high-temperature medium is greatly changed, the sealing structure of the metal cone-cone is limited by the structure, so that the requirement of no visible leakage in the duration time in the standard of GB/T13927-2008 industrial valve pressure test is hardly met.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the high-temperature elastic butterfly valve with the metal double-ring sealing ring is good in sealing performance.
In order to solve the technical problems, the invention adopts the following technical scheme: the high-temperature elastic butterfly valve with the metal double-ring sealing ring comprises a valve body, wherein a transversely-through medium channel is arranged on the valve body, a longitudinally-through valve rod mounting hole is further arranged on the valve body, an upper valve rod is arranged in a part, above the medium channel, of the valve rod mounting hole in a penetrating mode, a bearing is sleeved on the part, close to the direct channel, of the upper valve rod, in the valve rod mounting hole, and a valve plate is connected to the part, penetrating through the medium channel, of the upper valve rod; the valve body is provided with a pressing ring, a convex ring embedded in the valve body is arranged on the pressing ring, an annular mounting groove is formed in one side, close to the valve body, of an outer ring of the convex ring, a double-ring sealing ring is clamped on the convex ring, the double-ring sealing ring comprises an outer ring clamped in the annular mounting groove, an inner ring clamped in the convex ring and a connecting part for connecting the outer ring and the inner ring, and a single-ring sealing ring is arranged on one side, far away from the valve body, of the inner ring in the convex ring; coil springs are arranged in the double-ring sealing ring and the single-ring sealing ring, and the single-ring sealing ring is provided with an interference magnitude so that the sum of the diameters of the inner rings of the single-ring sealing ring and the double-ring sealing ring in a free state is larger than the distance between the end face, close to the valve body, of the pressing ring and the valve body;
the lower valve rod is arranged in the part of the valve rod mounting hole below the medium channel in a penetrating way and is connected with the valve plate, and a bearing is sleeved on the part of the lower valve rod in the valve rod mounting hole; the lower end of the lower valve rod passes through the outer periphery of the valve body, which is close to the end face of the valve body, and is provided with annular limiting grooves, the side walls of the upper side and the lower side of the limiting grooves are inclined planes, the lower end of the valve body is connected with a tail end cover for covering the lower valve rod, the tail end cover is provided with an annular positioning groove at a position corresponding to the limiting grooves, an elastic split ring is movably arranged in the annular positioning groove, the elastic split ring is sleeved on the outer periphery of the lower valve rod, the inner diameter of the annular positioning groove is larger than the diameter of an external circle when the elastic split ring clamps the lower valve rod, and the tail end cover is provided with a graphite ring at the outer periphery of the elastic split ring;
an annular mounting groove is formed in the valve body on the side wall of the upper portion of the bearing, filler is arranged around the upper valve rod in the annular mounting groove, a filler pressing piece for pressing the filler is connected to the valve body through a plurality of locking screws, and a driving assembly for driving the upper valve rod to rotate is arranged on the valve body.
As a preferable scheme, the outer ring of the double-ring sealing ring is provided with interference so that the outer diameter of the double-ring sealing ring in a free state is larger than the distance between the corresponding side wall of the pressing ring and the valve body, and the inner ring of the single-ring sealing ring and the double-ring sealing ring are also provided with interference so that the sum of the outer diameters of the double-ring sealing ring and the pressing ring in the free state is larger than the distance between the end face of the pressing ring, which is close to the valve body, and the valve body.
As a preferable scheme, the outer ring of the double-ring sealing ring is provided with an interference which is half of the sum of the interference of the single-ring sealing ring and the inner ring of the double-ring sealing ring.
As a preferable scheme, the packing pressing piece comprises a packing pressing sleeve sleeved on the valve rod for pressing packing and a packing pressing cover connected with the valve body through a plurality of locking screws, disc springs and nuts, wherein the top surface of the packing pressing sleeve is in a convex spherical shape, and a matched concave spherical surface is arranged on the packing pressing cover.
As a preferable scheme, the double-ring sealing ring and the single-ring sealing ring are formed by spinning a metal sheet.
As a preferred scheme, the valve body is provided with a connecting assembly for connecting the upper valve rod and the driving assembly.
As a preferable scheme, the connecting component comprises an extension upright post arranged on the upper part of the valve body, an extension rod connected with the upper end of the upper valve rod is movably arranged in the extension upright post in a penetrating manner, and the upper end of the extension rod is connected with an output piece of the driving component.
As a preferable scheme, the lengthened upright post is connected with a mounting seat of the driving assembly, and a heat insulation pad is arranged between the lengthened upright post and the mounting seat.
The beneficial effects of the invention are as follows:
the metal double-ring sealing ring high-temperature elastic pneumatic butterfly valve sealing pair adopts a combination of a metal double-ring sealing ring and a metal single-ring sealing ring, wherein the double-ring sealing ring comprises an outer ring clamped in an annular mounting groove, an inner ring clamped in a convex ring and a connecting part for connecting the outer ring and the inner ring, and the single-ring sealing ring is arranged on one side, far away from a valve body, of the inner ring in the convex ring; coil springs are arranged in the double-ring sealing ring and the single-ring sealing ring, and the single-ring sealing ring is provided with an interference magnitude so that the sum of the diameters of the inner rings of the single-ring sealing ring and the double-ring sealing ring in a free state is larger than the distance between the end face, close to the valve body, of the pressing ring and the valve body; the gap between the sealing byproducts caused by the expansion and contraction of the medium temperature is ensured to be automatically compensated, and the high-temperature elastic sealing automatic compensation function is realized.
Because the lower end of the lower valve rod passes through the part of the valve body, which is close to the periphery of the end face of the valve body, and is provided with annular limiting grooves, the side walls of the upper side and the lower side of the limiting grooves are inclined planes, the lower end of the valve body is connected with a tail end cover for covering the lower valve rod, the tail end cover is provided with an annular positioning groove at the position corresponding to the limiting grooves, an elastic split ring is movably arranged in the annular positioning groove, the elastic split ring is sleeved on the periphery of the lower valve rod, the inner diameter of the annular positioning groove is larger than the diameter of an external circle when the elastic split ring clamps the lower valve rod, and the tail end cover is provided with a graphite ring at the periphery of the elastic split ring; the lower valve rod is reliable in sealing and resistant to high temperature, and the upper side wall and the lower side wall of the limiting groove are inclined planes and elastic opening rings to be matched, so that the upper and lower moving of the lower valve rod due to temperature difference change can ensure the sealing effect.
The double-ring sealing ring and the single-ring sealing ring are formed by spinning metal sheets respectively, and have elasticity and strength.
The upper valve rod upper seal is formed by packing multilayer combined seal, the packing is tightly pressed by a nut, a disc spring, a gland and a pressing sleeve, if the packing is worn, a gap is generated between the packing and the upper valve rod, and the packing is tightly pressed by the disc spring in an automatic compensation way. The gland contacts with the jacket in spherical surface, which can ensure the jacket to uniformly compress the sealing filler.
Drawings
Fig. 1 is a schematic diagram of the front view structure of the present invention.
Fig. 2 is a schematic side cross-sectional view of the present invention.
Fig. 3 is an enlarged schematic view of the structure of the portion I in fig. 2 according to the present invention.
FIG. 4 is a schematic view of the sealing structure of the upper stem of the present invention.
FIG. 5 is a schematic view of the seal structure of the lower stem of the present invention.
Fig. 6 is a schematic view of the elastic split ring structure of the present invention.
In fig. 1 to 6: 1. the end cover 2, the graphite ring 3, the elastic split ring 4, the bearing 5, the lower valve rod 6, the valve plate 7, the taper pin 8, the upper valve rod 9, the single ring seal ring 10, the pressing ring 11, the double ring seal ring 12, the valve body 13, the packing 14, the packing pressing sleeve 15, the packing gland 16, the positioning pin 17, the lengthening upright post 18, the lengthening rod 19, the heat insulation pad 20 and the driving component.
Detailed Description
Specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.
1-6, a metal double-ring sealing ring high-temperature elastic butterfly valve comprises a valve body 12, wherein a transversely-through medium channel is arranged on the valve body 12, a longitudinally-through valve rod mounting hole is further arranged on the valve body 12, an upper valve rod 8 is arranged in a part, above the medium channel, of the valve rod mounting hole in a penetrating mode, a bearing 4 is sleeved on a part, close to a direct channel, of the upper valve rod 8 in the valve rod mounting hole, and a valve plate 6 is connected to the part, penetrating through the medium channel, of the upper valve rod 8 through a taper pin 7; the valve body 12 is provided with a pressing ring 10, the pressing ring 10 is provided with a convex ring embedded in the valve body 12, one side of the outer ring of the convex ring, which is close to the valve body 12, is provided with an annular mounting groove, the convex ring is provided with a double-ring sealing ring 11 in a clamping way, the double-ring sealing ring 11 comprises an outer ring clamped in the annular mounting groove, an inner ring clamped in the convex ring and a connecting part for connecting the outer ring and the inner ring, and one side, far away from the valve body 12, of the inner ring in the convex ring is provided with a single-ring sealing ring 9; coil springs are arranged in the double-ring sealing ring 11 and the single-ring sealing ring 9, and the single-ring sealing ring 9 is provided with an interference magnitude so that the sum of the diameters of the inner rings of the single-ring sealing ring 9 and the double-ring sealing ring 11 in a free state is larger than the distance between the end face, close to the valve body 12, of the pressing ring 10 and the valve body 12; the interference of the outer ring 11 of the double-ring sealing ring is half of the interference of the combination of the inner ring 11 of the double-ring sealing ring and the single-ring sealing ring 9, and both the double-ring sealing ring 11 and the single-ring sealing ring 9 are formed by spinning a metal sheet.
The lower valve rod 5 is arranged in the part of the valve rod mounting hole below the medium channel in a penetrating way and is connected with the valve plate 6 through a taper pin 7, and the part of the lower valve rod 5 in the valve rod mounting hole is also sleeved with a bearing 4; the lower end of the lower valve rod 5 passes through the outer periphery of the end face of the valve body 12 and is provided with an annular limiting groove, the side walls of the upper side and the lower side of the limiting groove are inclined surfaces, the lower end of the valve body 12 is connected with a tail end cover 1 for covering the lower valve rod 5, the position, corresponding to the limiting groove, of the tail end cover 1 is provided with an annular positioning groove, an elastic split ring 3 is movably arranged in the annular positioning groove, the elastic split ring 3 is sleeved on the outer periphery of the lower valve rod 5, the inner diameter of the annular positioning groove is larger than the diameter of an circumscribed circle when the elastic split ring 3 clamps the lower valve rod 5, and the outer periphery of the elastic split ring 3 is provided with a graphite ring 2;
an annular mounting groove is formed in the side wall, located at the upper portion of the bearing 4, of the valve rod mounting hole, packing 13 is arranged in the annular mounting groove around the upper valve rod 8, packing pressing pieces for pressing the packing 13 are connected to the valve body 12 through a plurality of locking screws, and a driving assembly 20 for driving the upper valve rod 8 to rotate is arranged on the valve body 12.
The packing compressing element comprises a packing compressing sleeve 14 which is sleeved on the valve rod and compresses packing 13, and a packing gland 15 which is connected with the valve body 12 through a plurality of locking screws, disc springs and nuts, the top surface of the packing compressing sleeve 14 is in a convex spherical shape, and a matched concave spherical surface is arranged on the packing gland 15.
The valve body 12 is provided with a connecting assembly for connecting the upper valve rod 8 and the driving assembly 20. The connecting assembly comprises an elongated upright post 17 arranged at the upper part of the valve body 12, a positioning pin 16 is arranged between the elongated upright post 17 and the valve body 12, an elongated rod 18 connected with the upper end of the upper valve rod 8 is movably arranged in the elongated upright post 17 in a penetrating manner, and the upper end of the elongated rod 18 is connected with an output piece of the driving assembly 20. The lengthened upright 17 is connected with a mounting seat of the driving assembly 20, and a heat insulation pad 19 is arranged between the lengthened upright 17 and the mounting seat.
Because the double-ring sealing ring 11 and the single-ring sealing ring 9 are formed by spinning metal sheets, the pre-pressing interference compensation amount is arranged during assembly, when the temperature changes, the valve plate 6 and the sealing ring can generate gaps and interference, and at the moment, the double-ring sealing ring 11 can elastically deform, so that the single-ring sealing ring 9 is extruded, the pre-pressing interference compensation amount of the single-ring sealing ring 9 is increased or reduced, the pre-pressing interference automatic compensation function is formed, and the sealing specific pressure which is required to be ensured due to the fact that the sealing pair interference amount changes along with the temperature is solved.
The metal double-ring sealing ring high-temperature elastic butterfly valve manufactured by adopting the structure can meet the sealing requirements of all temperature sections at normal temperature to 670 ℃ no matter from the valve plate sealing, the upper valve rod sealing and the lower valve rod sealing, the sealing grade can reach the requirement that no visible leakage exists in the standard of GB/T13927-2008 industrial valve pressure test, and the metal double-ring sealing ring high-temperature elastic butterfly valve can be widely used for connecting and isolating media on a fuel gas pipeline of a diesel engine of a ship power system.
The above-described embodiments are merely illustrative of the principles and functions of the present invention, and some of the practical examples, not intended to limit the invention; it should be noted that modifications and improvements can be made by those skilled in the art without departing from the inventive concept, and these are all within the scope of the present invention.

Claims (8)

1. The high-temperature elastic butterfly valve with the metal double-ring sealing ring comprises a valve body, wherein a transversely-through medium channel is arranged on the valve body, a longitudinally-through valve rod mounting hole is further arranged on the valve body, an upper valve rod is arranged in a part, above the medium channel, of the valve rod mounting hole in a penetrating mode, a bearing is sleeved on the part, close to the direct channel, of the upper valve rod, in the valve rod mounting hole, and a valve plate is connected to the part, penetrating through the medium channel, of the upper valve rod; be equipped with clamping ring on the valve body, its characterized in that: the pressing ring is provided with a convex ring embedded in the valve body, one side of the outer ring of the convex ring, which is close to the valve body, is provided with an annular mounting groove, the convex ring is clamped with a double-ring sealing ring, the double-ring sealing ring comprises an outer ring clamped in the annular mounting groove, an inner ring clamped in the convex ring and a connecting part for connecting the outer ring and the inner ring, and one side, far away from the valve body, of the inner ring in the convex ring is provided with a single-ring sealing ring; coil springs are arranged in the double-ring sealing ring and the single-ring sealing ring, and the single-ring sealing ring is provided with an interference magnitude so that the sum of the diameters of the inner rings of the single-ring sealing ring and the double-ring sealing ring in a free state is larger than the distance between the end face, close to the valve body, of the pressing ring and the valve body;
the lower valve rod is arranged in the part of the valve rod mounting hole below the medium channel in a penetrating way and is connected with the valve plate, and a bearing is sleeved on the part of the lower valve rod in the valve rod mounting hole; the lower end of the lower valve rod passes through the outer periphery of the valve body, which is close to the end face of the valve body, and is provided with annular limiting grooves, the side walls of the upper side and the lower side of the limiting grooves are inclined planes, the lower end of the valve body is connected with a tail end cover for covering the lower valve rod, the tail end cover is provided with an annular positioning groove at a position corresponding to the limiting grooves, an elastic split ring is movably arranged in the annular positioning groove, the elastic split ring is sleeved on the outer periphery of the lower valve rod, the inner diameter of the annular positioning groove is larger than the diameter of an external circle when the elastic split ring clamps the lower valve rod, and the tail end cover is provided with a graphite ring at the outer periphery of the elastic split ring;
an annular mounting groove is formed in the valve body on the side wall of the upper portion of the bearing, filler is arranged around the upper valve rod in the annular mounting groove, a filler pressing piece for pressing the filler is connected to the valve body through a plurality of locking screws, and a driving assembly for driving the upper valve rod to rotate is arranged on the valve body.
2. The high temperature elastic butterfly valve of a metal double ring seal ring of claim 1, wherein: the outer ring of the double-ring sealing ring is provided with an interference which enables the outer diameter of the double-ring sealing ring in a free state to be larger than the distance between the corresponding side wall of the pressing ring and the valve body, and the inner ring of the single-ring sealing ring and the double-ring sealing ring are also provided with an interference which enables the sum of the outer diameters of the double-ring sealing ring and the outer diameter of the double-ring sealing ring in the free state to be larger than the distance between the end face, close to the valve body, of the pressing ring and the valve body.
3. The high temperature elastic butterfly valve of a metal double ring seal ring of claim 2, wherein: the outer ring of the double-ring sealing ring is provided with an interference which is half of the sum of the interference of the single-ring sealing ring and the inner ring of the double-ring sealing ring.
4. The high temperature elastic butterfly valve of a metal double ring seal ring of claim 1, wherein: the packing pressing piece comprises a packing pressing sleeve which is sleeved on the valve rod and used for pressing packing, and a packing pressing cover which is connected with the valve body through a plurality of locking screws, disc springs and nuts, wherein the top surface of the packing pressing sleeve is in a convex spherical shape, and a matched concave spherical surface is arranged on the packing pressing cover.
5. The high temperature elastic butterfly valve of a metal double ring seal ring of claim 1, wherein: the double-ring sealing ring and the single-ring sealing ring are formed by spinning a metal sheet.
6. The high temperature elastic butterfly valve of a metal double ring seal ring of claim 1, wherein: and a connecting component for connecting the upper valve rod and the driving component is arranged on the valve body.
7. The high temperature elastic butterfly valve of claim 6, wherein: the connecting assembly comprises an extension upright post arranged on the upper portion of the valve body, an extension rod connected with the upper end of the upper valve rod is movably arranged in the extension upright post in a penetrating mode, and the upper end of the extension rod is connected with an output piece of the driving assembly.
8. The high temperature elastic butterfly valve of claim 7, wherein: the lengthened upright post is connected with the mounting seat of the driving assembly, and a heat insulation pad is arranged between the lengthened upright post and the mounting seat.
CN202310187082.4A 2023-03-01 2023-03-01 High-temperature elastic butterfly valve with metal double-ring sealing ring Pending CN116357748A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310187082.4A CN116357748A (en) 2023-03-01 2023-03-01 High-temperature elastic butterfly valve with metal double-ring sealing ring

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310187082.4A CN116357748A (en) 2023-03-01 2023-03-01 High-temperature elastic butterfly valve with metal double-ring sealing ring

Publications (1)

Publication Number Publication Date
CN116357748A true CN116357748A (en) 2023-06-30

Family

ID=86912640

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310187082.4A Pending CN116357748A (en) 2023-03-01 2023-03-01 High-temperature elastic butterfly valve with metal double-ring sealing ring

Country Status (1)

Country Link
CN (1) CN116357748A (en)

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