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NL2018828A - Regulating valve with an axially localizable valve core - Google Patents

Regulating valve with an axially localizable valve core Download PDF

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Publication number
NL2018828A
NL2018828A NL2018828A NL2018828A NL2018828A NL 2018828 A NL2018828 A NL 2018828A NL 2018828 A NL2018828 A NL 2018828A NL 2018828 A NL2018828 A NL 2018828A NL 2018828 A NL2018828 A NL 2018828A
Authority
NL
Netherlands
Prior art keywords
valve
groove
rob
core
hand wheel
Prior art date
Application number
NL2018828A
Other languages
Dutch (nl)
Other versions
NL2018828B1 (en
Inventor
Shi Yili
Original Assignee
Chengdu Tian Hang Zhi Hong Man Consulting 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 Chengdu Tian Hang Zhi Hong Man Consulting Co Ltd filed Critical Chengdu Tian Hang Zhi Hong Man Consulting Co Ltd
Publication of NL2018828A publication Critical patent/NL2018828A/en
Application granted granted Critical
Publication of NL2018828B1 publication Critical patent/NL2018828B1/en

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Classifications

    • 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
    • F16K1/20—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 arranged externally of valve member
    • F16K1/2028—Details of bearings for the axis of rotation
    • 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
    • F16K1/20—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 arranged externally of valve member
    • F16K1/2042—Special features or arrangements of the sealing
    • F16K1/2057—Special features 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
    • F16K1/16—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
    • F16K1/224—Details of bearings for the axis of rotation
    • 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
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/06—Construction of housing; Use of materials therefor of taps or cocks
    • F16K27/067—Construction of housing; Use of materials therefor of taps or cocks with spherical plugs
    • 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
    • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
    • F16K5/0647—Spindles or actuating means
    • 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
    • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/08—Details
    • F16K5/14—Special arrangements for separating the sealing faces or for pressing them together
    • F16K5/20—Special arrangements for separating the sealing faces or for pressing them together for plugs with spherical surfaces
    • F16K5/201—Special arrangements for separating the sealing faces or for pressing them together for plugs with spherical surfaces with the housing or parts of the housing mechanically pressing the seal against the plug

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Valves (AREA)
  • Mechanically-Actuated Valves (AREA)

Abstract

The present invention relates to a regulating valve with an axially localizable valve core comprising a valve body, a valve core arranged in the inner chamber of the valve body, a valve rob, a seal ring and a hand wheel; the valve rob crossing the inner chamber of the valve body is fixedly connected to the valve core; a first groove is arranged at a bottom of the valve body, and received with a bearing therein by securing to an outer ring of the bearing; the bearing is fixedly connected to the hand wheel; a second groove is arranged on the hand wheel, and provided with an internal thread; an external thread matching the internal thread on the second groove is arranged at a lower end of the valve rob. This enables the valve core to be positioned and prevents internal spillage in the valve. The present invention also has a simple structure and convenient operation.

Description

TECHNICAL FIELD
The present invention relates to the field of industrial instalment regulating devices, in particular to a regulating valve with an axially localizable valve core.
BACKGROUND
Regulating valves are used in many fields, for example, wearing-resistance valves are used for polysilicon apparatus in silicon chemical industry, pulverized coal medium in coal chemical industry, and power station in electrical power system. Nevertheless, the regulating valves shall match diverse technical requirements based on various use conditions, process medium, security and corrosive level.
Usually, valve core of existing regulating valve, e.g. V-shaped ball valve, is provided with a split collar for locating the valve core, or lacking of axially locating device, and thus unable to regulate the position of the valve core properly in the process of assembling. In addition, the valve core which is suffering from fluid force can be displaced axially and thus causes issues like internal spillage during operating. The influence of above problems would be impacting on the environment, or causing safety accident.
Chinese patent CN102442554A, filed on 2011-09-14, disclose a spherical flow regulating valve comprising a valve main body; the valve main body comprises a valve body and flanges connected to either end of the valve body; the middle of the valve main body is provided with an inlet and an outlet which are connected to each other, and both the inlet and the outlet are shaped as trumpet with larger outer caliber and smaller inner caliber; a valve seat with two interconnected ends is arranged at a hollow position of a channel between the inlet and the outlet; a V-shaped ball valve core is arranged in and connected to the valve seat, forming a hard sealing connection; a surface of the valve seat contacting the V-shaped ball valve core is provided with a V-shaped notch, and the upper and lower ends of the V-shaped ball valve core are respectively provided with an upper valve rod and a lower valve rod for rotating the V-shaped ball valve core. The invention can be used for accurate flow control and regulation of air-powder media, and has improved abrasion-resistant and self-cleaning capacity. However, the valve core which is suffering from fluid force can be displaced axially and causes issues like internal spillage for lacking axially locating device, and thus results in unnecessary losses.
SUMMARY OF THE INVENTION
The object of the present invention is to solve the above-mentioned problems in prior art;
the present invention provides a regulating valve with an axially localizable valve core, which has simple structure, practicability and convenience, can solve the problem of regulating position of the valve core during operating and assembling process.
To achieve the above object, the present invention adopts a technical solution as follows:
A regulating valve with an axially localizable valve core, comprises a valve body, a valve core arranged in an inner chamber of the valve body, a valve rob, a seal ring and a hand wheel; the valve rob crossing the inner chamber of the valve body is fixedly connected to the valve core; a first groove is arranged at a bottom of the valve body, and received with a bearing therein by securing to an outer ring of the bearing; while an inner ring of the bearing is fixedly connected to the hand wheel; a second groove is arranged on the hand wheel, and provided with an internal thread; an external thread matching the internal thread on the second groove is arranged at a lower end of the valve rob.
A threaded pressing disc and a valve seat are arranged in the inner chamber of the valve body, and the threaded pressing disc compresses the valve seat to the valve body.
The seal ring is sheathed on the valve rob, and arranged at a bottom of the inner chamber of the valve body.
The external thread at the bottom of the valve rob and the internal thread on the second groove are in the form of matching trapezoidal threads.
The advantages of the present invention are that
1. As the hand wheel rotates to move the valve rob up and down, the valve core will move together with the valve rob due to their fixed connection; as the hand wheel stops, the axial position of the valve rod/core would be stayed still due to the build-in self-locking capacity of the trapezoidal threads even if forces of the process medium acted on the valve rod/core, which then remains the axial position of the valve core of the regulating valve.
2. The threaded pressing disc and the valve seat are arranged in the inner chamber of the valve body, and the threaded pressing disc compresses the valve seat to the valve body to achieve a tighter contact between the valve body and the valve seat. As a result, the sealing will be improved.
3. In order to prevent fluid leakage, the contact sections between the valve rob and the valve body are sealed by the seal ring.
4. The trapezoidal thread possesses a self-locking capacity, a good two-way transmission, wear-resistance, and fastening.
5. The present invention has a simple structure, convenient operation and lower cost.
BRIEF DESCRIPTION OF DRAWINGS
Fig. 1 shows a structural schematic view of the present invention;
List of reference:
1. Valve body
2. Threaded pressing disc
3. Valve seat
4. Valve core
5. Valve rob
6. Seal ring
7. Hand wheel
8. First groove
9. Second groove
10. Bearing
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
The invention will be further described with reference to the accompanying drawing:
Embodiment 1
Fig 1 shows an embodiment of regulating valve with an axially localizable valve core, comprises a valve body 1, a valve core 4 arranged in an inner chamber of the valve body 1, a valve rob 5, a seal ring 6 and a hand wheel 7; the valve rob 5 crossing the inner chamber of the valve body 1 is fixedly connected to the valve core 4; a first groove 8 is arranged at a bottom of the valve body 1, and received with a bearing 10 therein by securing to an outer ring of the bearing 10; while an inner ring of the bearing 10 is fixedly connected to the hand wheel 7; a second groove 9 is arranged on the hand wheel 7, and provided with an internal thread; an external thread matching the internal thread on the second groove 9 is arranged at a lower end of the valve rob 5.
The valve rob 5 is fixedly connected to the valve core 4 and fitted into the valve body 1; as the hand wheel 7 is secured to the inner ring of the bearing 10, the hand wheel 7 may be pivoted relative to the valve body 1; as the hand wheel 7 rotates, the position of the valve rob 5 and thereby the valve rod 4 thereon could be regulated up and down by means of the cooperation of the threads between the second groove 9 and the valve rob 5; as the hand wheel 7 stops, the axial position of the valve rod 5/core 4 would be stayed still due to the build-in self-locking capacity of the threads even if forces of the process medium acted on the valve rod
5/core 4, which then remains the axial position of the valve core 4 of the regulating valve.
Embodiment 2
Fig 1 shows an embodiment of regulating valve with an axially localizable valve core, comprises a valve body 1, a valve core 4 arranged in an inner chamber of the valve body 1, a valve rob 5, a seal ring 6 and a hand wheel 7; the valve rob 5 crossing the inner chamber of the valve body 1 is fixedly connected to the valve core 4; a first groove 8 is arranged at the bottom of the valve body 1, and received with a bearing 10 therein by securing to an outer ring of the bearing 10; while an inner ring of the bearing 10 is fixedly connected to the hand wheel 7; a second groove 9 is arranged on the hand wheel 7, and provided with an internal thread; an external thread matching the internal thread on the second groove 9 is arranged at a lower end of the valve rob 5.
A threaded pressing disc 2 and a valve seat 3 are arranged in the inner chamber of the valve body 1, and the threaded pressing disc 2 compresses the valve seat 3 to the valve body 1.
The valve rob 5 is fixedly connected to the valve core 4 and fitted into the valve body 1; as the hand wheel 7 is secured to the inner ring of the bearing 10, the hand wheel 7 may be pivoted relative to the valve body 1; as the hand wheel 7 rotates, the position of the valve rob 5 and thereby the valve rod 4 thereon could be regulated up and down by means of the cooperation of the threads between the second groove 9 and the valve rob 5; as the hand wheel
7 stops, the axial position of the valve rod 5/core 4 would be stayed still due to the build-in self-locking capacity of the threads even if forces of the process medium acted on the valve rod 5/core 4, which then remains the axial position of the valve core 4 of the regulating valve.
The threaded pressing disc 2 compresses the valve seat 3 to the valve body 1; the valve core 4 rotates to open or close the valve; the sealing has a better performance when the valve is closed.
Embodiment 3
Fig 1 shows an embodiment of regulating valve with an axially localizable valve core, comprises a valve body 1, a valve core 4 arranged in an inner chamber of the valve body 1, a valve rob 5, a seal ring 6 and a hand wheel 7; the valve rob 5 crossing the inner chamber of the valve body 1 is fixedly connected to the valve core 4; a first groove 8 is arranged at a bottom of the valve body 1, and received with a bearing 10 therein by securing to an outer ring of the bearing 10; while an inner ring of the bearing 10 is fixedly connected to the hand wheel 7; a second groove 9 is arranged on the hand wheel 7, and provided with an internal thread; an external thread matching the internal thread on the second groove 9 is arranged at a lower end of the valve rob 5.
A threaded pressing disc 2 and a valve seat 3 are arranged in the inner chamber of the valve body 1, and the threaded pressing disc 2 compresses the valve seat 3 to the valve body 1.
The seal ring 6 is sheathed on the valve rob 5, and arranged at a bottom of the inner chamber of the valve body 1.
The external thread at the bottom of the valve rob 5 and the internal thread on the second groove 9 are in the form of matching trapezoidal thread.
The valve rob 5 is fixedly connected to the valve core 4 and fitted into the valve body 1; as the hand wheel 7 is secured to the inner ring of the bearing 10, the hand wheel 7 may be pivoted relative to the valve body 1; as the hand wheel 7 rotates, the position of the valve rob 5 and thereby the valve rod 4 thereon could be regulated up and down by means of the cooperation of the threads between the second groove 9 and the valve rob 5; as the hand wheel 7 stops, the axial position of the valve rod 5/core 4 would be stayed still due to the build-in self-locking capacity of the threads even if forces of the process medium acted on the valve rod
5/core 4, which then remains the axial position of the valve core 4 of the regulating valve.
The threaded pressing disc 2 compresses the valve seat 3 to the valve body 1; the valve core 4 rotates to open or close the valve; the sealing has a better performance when the valve is closed.
In order to prevent fluid leakage, the contact sections between the valve rob 5 and the 10 valve body 1 are sealed by the seal ring 6.
Trapezoidal thread is applied to the valve rob 5 and the second groove 9, so that by rotating the hand wheel, a small torque thereto can generate a strong axial force to push valve rob 5 to move up and down based on the inherent characteristics of the trapezoidal thread.

Claims (4)

ConclusiesConclusions 1. Regelklep met een axiaal lokaliseerbare schuifafsluiter, omvattende:A control valve with an axially locatable gate valve, comprising: een klephuis (1), een schuifafsluiter (4), een klep stang (5), een afdichtring (6) en een handwiel (7), met het kenmerk, dat de schuifafsluiter (4) in de binnenkamer van het klephuis (1) is gerangschikt; de klepstang (5) die de binnenkamer van het klephuis (1) doorkruist vast aan de schuifafsluiter (4) is verbonden;a valve housing (1), a gate valve (4), a valve rod (5), a sealing ring (6) and a handwheel (7), characterized in that the gate valve (4) in the inner chamber of the valve housing (1) is arranged; the valve rod (5) which traverses the inner chamber of the valve housing (1) is fixedly connected to the gate valve (4); een eerste groef (8) op de bodem van het klephuis (1) is gerangschikt, en een lager (10) ontvangt; waarbij de lager (10) aan de eerste groef (8) is bevestigd en het handwiel (7) in de lager (10) is ingebed;a first groove (8) is arranged on the bottom of the valve housing (1), and receives a bearing (10); wherein the bearing (10) is attached to the first groove (8) and the handwheel (7) is embedded in the bearing (10); een tweede groef (9) aan het handwiel (7) is gerangschikt, en voorzien van een interne draad; waarbij een uitwendige draad die past met de inwendige draad op de tweede groef (9) bij het ondereind van de klepstang (5) is gerangschikt.a second groove (9) is arranged on the hand wheel (7), and provided with an internal thread; wherein an external thread that fits with the internal thread is arranged on the second groove (9) at the lower end of the valve rod (5). 2. Regelklep met een axiaal lokaliseerbaar schuifafsluiter volgens conclusie 1, met het kenmerk, dat een persschijf (2) met draad en een klep zitting (3) in de binnenkamer van het klephuis (1) zijn gerangschikt, en de persschijf (2) met draad de klepzitting (3) naar het klephuis (1) samendrukt.A control valve with an axially locatable gate valve according to claim 1, characterized in that a pressure disc (2) with thread and a valve seat (3) are arranged in the inner chamber of the valve housing (1), and the pressure disc (2) with thread the valve seat (3) to the valve housing (1). 3. Regelklep met een axiaal lokaliseerbaar schuifafsluiter volgens conclusie 1, met het kenmerk, dat de afdichtring (6) de klepstang (5) van een bekleding voorziet, en bij de bodem van de binnenkamer van het klephuis (1) is gerangschikt.Control valve with an axially locatable gate valve according to claim 1, characterized in that the sealing ring (6) provides a cover for the valve rod (5) and is arranged at the bottom of the inner chamber of the valve housing (1). 4. Regelklep met een axiaal lokaliseerbaar schuifafsluiter volgens conclusie 1, met het kenmerk, dat de externe draad bij de bodem van de klepstang (5) en de inwendige draad op de tweede groef (9) in de vorm van een bij elkaar passende trapeziumvormige draad zijn.Control valve with an axially locatable gate valve according to claim 1, characterized in that the external thread at the bottom of the valve rod (5) and the internal thread on the second groove (9) in the form of a matching trapezoidal thread to be.
NL2018828A 2016-06-27 2017-05-02 Regulating valve with an axially localizable valve core NL2018828B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201620640537.9U CN205806521U (en) 2016-06-27 2016-06-27 A kind of location regulation valve

Publications (2)

Publication Number Publication Date
NL2018828A true NL2018828A (en) 2018-01-09
NL2018828B1 NL2018828B1 (en) 2018-01-25

Family

ID=57506348

Family Applications (1)

Application Number Title Priority Date Filing Date
NL2018828A NL2018828B1 (en) 2016-06-27 2017-05-02 Regulating valve with an axially localizable valve core

Country Status (2)

Country Link
CN (1) CN205806521U (en)
NL (1) NL2018828B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113719630A (en) * 2021-08-30 2021-11-30 上海凯科阀门制造有限公司 Bidirectional hard sealing half ball valve

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2105282A (en) * 1937-10-04 1938-01-11 Charles M Dolby Valve
GB612328A (en) * 1946-02-20 1948-11-11 Miles Aircraft Ltd Improvements in or relating to valves or cocks
US3367359A (en) * 1966-01-05 1968-02-06 Herbert G. Johnson Ball valve assembly with corrosion resistant lining
US3410422A (en) * 1966-09-26 1968-11-12 Carpentier Urgel Ramual Dust trap and valve for high temperature operation
FR1590356A (en) * 1968-10-30 1970-04-13
DE1801216A1 (en) * 1968-10-04 1970-05-06 Rautenkranz Int Hermann Rooster with a spherical chick
US4524946A (en) * 1981-11-02 1985-06-25 Thompson William E Ball valve having improved seal means
DE10140054A1 (en) * 2001-08-16 2003-02-27 Vetec Ventiltechnik Gmbh Shut-off device comprises a seat ring lying in its closed position with the entire periphery of its sealing phase on the spherical part of a throttle and closing body

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2105282A (en) * 1937-10-04 1938-01-11 Charles M Dolby Valve
GB612328A (en) * 1946-02-20 1948-11-11 Miles Aircraft Ltd Improvements in or relating to valves or cocks
US3367359A (en) * 1966-01-05 1968-02-06 Herbert G. Johnson Ball valve assembly with corrosion resistant lining
US3410422A (en) * 1966-09-26 1968-11-12 Carpentier Urgel Ramual Dust trap and valve for high temperature operation
DE1801216A1 (en) * 1968-10-04 1970-05-06 Rautenkranz Int Hermann Rooster with a spherical chick
FR1590356A (en) * 1968-10-30 1970-04-13
US4524946A (en) * 1981-11-02 1985-06-25 Thompson William E Ball valve having improved seal means
DE10140054A1 (en) * 2001-08-16 2003-02-27 Vetec Ventiltechnik Gmbh Shut-off device comprises a seat ring lying in its closed position with the entire periphery of its sealing phase on the spherical part of a throttle and closing body

Also Published As

Publication number Publication date
CN205806521U (en) 2016-12-14
NL2018828B1 (en) 2018-01-25

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