CN2370231Y

CN2370231Y - Self sealing eccentric butterfly valve

Info

Publication number: CN2370231Y
Application number: CN 99231672
Authority: CN
Inventors: 杨绍贵; 杨翠明
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-05-19
Filing date: 1999-05-19
Publication date: 2000-03-22
Anticipated expiration: 2009-05-19

Abstract

The utility model relates to a self-sealing eccentric butterfly valve, comprising a valve body 1, a valve rod 2, a butterfly plate 4, an O-shaped sealing ring 3, filling 7, a gland for the filling 9, a limit disc 11, and a handle 12. The utility model is characterized in that a sealing surface of an outer circle of the butterfly plate 4 is a spherical surface, and a sealing surface of the valve body is an inner cone hole surface; a dovetail groove is arranged on a sealing surface of the butterfly plate or the sealing surface of the valve body; the O-shaped sealing ring is arranged inside the groove; a center line of the outer circle of the butterfly plate and a center line of the valve body are eccentric. When the sealing surface of the valve body is matched with the sealing surface of the outer circle of the butterfly plate, the O-shaped sealing ring 3 and the sealing surface of the valve body have 0.5 mm to 0.7 mm of shrink range. The utility model has the advantages of reliable sealing performance, long service life, small force moment of a switch, flexible operation, portability, convenient maintenance, etc.

Description

The selfsealings eccentric-butterfly-valve

The utility model relates to butterfly valve, particularly a function admirable, good airproof performance, automatic seal eccentric butterfly valve that switch is light.

As everyone knows, existing reed valve is divided into centre-pivoted butterfly valve and eccentric-butterfly-valve, and they mainly are made up of valve body, butterfly body plate, lining-rubber sleeve or seal ring, valve rod, handle, position-arresting disk, handle pawl, spring, bolt etc.Valve body is cast iron or cast steel.In valve body inner bore lining-rubber sleeve is housed, the general 7-12mm of the thickness of rubber sleeve, it is 8-16Kgf/cm that the decrement in the outer garden of rubber sleeve endoporus and butterfly plate generally is suitable for pressure at 1.4-1.8mm ²In fact because valve body, the machining accuracy of butterfly plate is difficult to reach the influence of designing requirement and rubber sleeve precision, the magnitude of interference of butterfly plate cylindrical and rubber sleeve to be much higher than sometimes 1.4 or 1.8mm could realize the sealing, therefore existing reed valve is when using under the different working conditions, because temperature, the medium turbidity test, condition effect such as environment, sealing is very insecure, on the other hand, since medium temperature, the variation of ambient temperature, and the switch moment of existing butterfly valve is also very big sometimes, the switch difficulty, the phenomenon that the use a period of time that has does not open in addition.Its outer garden of two existing butterfly valve butterfly plates is big with the magnitude of interference of gum cover, and gum cover is in confined state for a long time, causes rubber sleeve aging fast, and after gum cover was aging, valve just produced and leaks, and made the valve seal inefficacy, has seriously influenced valve working life.

On the market a kind of eccentric-butterfly-valve is arranged now, its seal ring (rubber material) is fixed in the annular groove outside of butterfly plate with pressing plate, seal ring on the butterfly plate and valve body sealing surface decrement still be 1.4 and 1.8mm when valve cuts out, seal ring is in pressured state, cause valve switch moment still bigger, but than the centre-pivoted butterfly valve of lining raising has been arranged at aspect of performance, but sealing principle remains crush seal.Still influence valve working life.Existing butterfly valve is because switch moment is big, use electronic, surge, during device such as pneumatic, generally all select device, thereby influence enterprise, the economic benefit of applying unit than the large driving force square.

The purpose of this utility model just in order to overcome the above-mentioned drawback that prior art exists a kind of good seal performance that provides, use that wide, switch light and flexible, long service life, maintenance are convenient especially, low cost of manufacture, good, the high performance selfsealings eccentric-butterfly-valve of social benefit.

The utility model above-mentioned purpose is to realize by such technological scheme, it is a kind of selfsealings eccentric-butterfly-valve, comprise valve body, valve rod, butterfly plate, O-ring seals, filler, Gland, position-arresting disk, handle, handle pawl, it is characterized in that: butterfly plate cylindrical sealing surface is a sphere, valve body sealing surface is a taper hole, one dovetail groove is arranged on butterfly plate sealing surface or valve body sealing surface, O-ring seals is housed in the groove; Butterfly plate is fixed on propping up in the earhole on the valve rod by the journal stirrup at its back side, and wherein butterfly plate cylindrical center line and journal stirrup centerline hole are eccentric.When valve body sealing surface cooperated with butterfly plate cylindrical sealing surface, O-ring seals and valve body sealing surface had magnitude of interference 0.5-0.7mm.

Said structure of the present utility model is further specified by the embodiment that accompanying drawing provides.

Of the present utility model have a following accompanying drawing:

Accompanying drawing 1 partly cuts open schematic representation for structure of the present utility model;

Accompanying drawing 2 is the A-A generalized section of accompanying drawing 1.

Referring to accompanying drawing: among the figure: 1 is that valve body, 2 is Packing seat for pin, 6 and 8 for O-ring seals, 5 for eccentric butterfly plate, 3 for valve rod, 4,7 is that middle filler, 9 is that Gland, 11 is that position-arresting disk, 12 is handle, handle pawl 13, wherein position-arresting disk 11 is fixed on the valve body 1 by fixed block 10, handle pawl 13 is hinged by pin 5 and handle 12, and is supported by Returnning spring 14; During being pressed in, Gland 9 is fixed on the valve body on the filler 7 and by fixed block; The lower end of valve rod is installed on the valve body 1 by the

seal ring

21,22 of band O-ring seals 20, and the bottom is by bottom 18 and fixing bolt 19 ends envelope; In the present embodiment, dovetail groove is set on the butterfly plate, the O-ring seals 3 in the groove exceeds butterfly plate sealing surface 0.5-0.7mm, prevents that O shape circle from being washed out by medium, and the volume of dovetail groove is greater than the volume of O-ring seals.

The utility model has changed the crush seal that has butterfly valve now from motive sealing into owing to described structure.When throttle down, pull handle 12, hold handle pawl 13, make handle pawl 13 leave position-arresting disk 11, drive valve rod 2, drive eccentric 4 while of butterfly plate half-twist butterfly plate in rotation to the clockwise direction half-twist, the micro-distance of advancing, make the O shape circle on the butterfly plate contact and make the compression of O shape circle with valve body sealing surface, form certain magnitude of interference, to guarantee initial sealing.When medium by the time, medium just enters in the dovetail groove, and O-ring seals is pushed to one side of groove, blocks the gap between the sealing pair, realizes that sealing, pressure medium are big more, sealing is good more.When butterfly valve was opened, handle 12 counter-clockwise half-twists drove valve rod 2, and butterfly plate 4 is a half-twist and a slow astern slight distance simultaneously, and O shape circle is not contacted with valve body 1 sealing surface, and butterfly valve is opened.

O-ring seals, can change material according to the difference of working medium, use with water as the pipeline of medium in O shape circle select nitrile rubber, or fluorine rubber, use is at oil product, and rock gas is on the pipeline of media such as coal gas, O shape circle selects the fine or fluorine rubber spraying polytetrafluoroethylmaterial material of fourth, and O shape circle has not only kept the better elastic function but also had the function of corrosion-resistant and low friction factor like this.

The utility model is because described structure has solved the shortcoming of existing product fully, and it is compared also with existing butterfly valve and has the following advantages:

One. seal more reliable. Utilize the seal with O ring principle, sealed easily and realized zero leakage.

Two. improved service life. The magnitude of interference that O shape circle contacts with valve body sealing surface only is 0.5-0.7mm, be significantly less than the magnitude of interference that has butterfly valve now, and contact-making surface being little, O shape circle is difficult for aging, O shape circle Only when valve closing, just contact with valve body sealing surface, as using spraying polytetrafluoroethylene (PTFE) O shape circle friction system Number is more much smaller than rubber, thereby has prolonged the service life of butterfly valve.

Three. switch moment is little, and flexible operation is light.It is narrow mainly to be that magnitude of interference that O shape circle contacts with valve body sealing surface is significantly smaller than the decrement and the surface of contact of the cushion rubber that has butterfly valve now, what sealing the utility model of its two valve rod was used is the F-4 material, friction factor is significantly less than the rubber friction coefficient that existing butterfly valve uses, thus the light memorial tablet of switch.

Four. applied widely.No matter the pipeline 5 of low pressure, middle pressure, corrosivity or non-corrodibility medium all is suitable for, enlarged the using scope of butterfly valve.

Five. it is convenient especially to keep in repair.The sealing of this valve is to bear by O shape circle, after service time, permanent O shape circle damaged, at the scene, changes a new O shape and encloses up valve and realized sealing again.

The utility model is applicable to: in the pipeline of liquid, gas, corrosion and non-corrosive medium.

Claims

1. selfsealings eccentric-butterfly-valve, comprise valve body (1), valve rod (2), butterfly plate (4), O-ring seals (3), filler (7), Gland (9), position-arresting disk (11), handle (12), it is characterized in that: butterfly plate (4) cylindrical sealing surface is a sphere, valve body sealing surface is the internal taper hole face, one dovetail groove is arranged on the sealing surface of butterfly plate sealing surface or valve body, O-ring seals is housed in the groove; Butterfly plate is fixed on propping up in the earhole on the valve rod by the journal stirrup at its back side, and wherein butterfly plate cylindrical center line and journal stirrup centerline hole are eccentric.

2. selfsealings eccentric valve according to claim 1 is characterized in that: when valve body sealing surface cooperated with butterfly plate cylindrical sealing surface, O-ring seals (3) had magnitude of interference 0.5-0.7mm with valve body sealing surface.

3. selfsealings eccentric valve according to claim 1 is characterized in that: wherein position-arresting disk (11) is fixed on the valve body (1) by fixed block (10), and handle pawl (13) is hinged by pin (5) and handle (12), and is supported by Returnning spring (14).

4. selfsealings eccentric valve according to claim 1 is characterized in that: the lower end of valve rod is installed on the valve body (1) by seal ring (21), the bearing (22) of band O-ring seals (20), and the bottom is by bottom (18) and fixing bolt (19) end envelope.