CN2384060Y

CN2384060Y - Elastic sealing metallic ball valve

Info

Publication number: CN2384060Y
Application number: CN 99224328
Authority: CN
Inventors: 王春莲
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-07-01
Filing date: 1999-07-01
Publication date: 2000-06-21
Anticipated expiration: 2009-07-01

Abstract

The utility model relates to a refractory elastic sealing metallic ball valve which comprises a valve body, a valve base, a ball body, a valve handle, a sealing ring, a filling gland, a location block, a sleeve barrel and a spanner. The utility model is characterized in that the valve body is composed of a left valve body and a right valve body, and a flow channel and an eccentric ball body installed off-center to the centre of a sphere are arranged in the left valve body or the right valve body. The sealing surface of the valve base is inclined by three to ten degrees with the central line of the valve body. A compression spring is arranged between the valve handle and the eccentric ball body, and a ball body position adjusting rod, corresponding filling material and a filling pressing sleeve are arranged on the valve body at the bottom of the eccentric ball body. The utility model has reasonable structure, and the applicable medium is steam, petroleum product, etc. The maximum working temperature can reach 425 DEG C.

Description

Metal elastic-sealed ball valve

The utility model belongs to valve class technical field, specifically a kind of metal elastic-sealed ball valve that is applicable to high temperature media.

As everyone knows, ball valve is to have the valve that blocks with regulatory function, and its closure member is a spheroid, makes the purpose that rotation reaches opening and closing with spheroid around the valve body center line, and ball valve main work on pipeline cuts off, distributes and changes the media flow direction to be used.Ball valve can be divided into two big classes by its sealing material: nonmetal seal ball-valve and metal seal ball valve.In the employed in the market high-temperature ball valve, modal structure is a floating ball formula metal hard-sealing ball valve, this ball seat adopts cobalt, chromium, tungsten, carbide reactor to be welded into the conical seal (contact) face of certain width usually, sphere adopts chromed hardened processing, gives tight power and adjust pad making between spheroid and the valve seat and form linear sealing by sealing.1., because spheroid and ball seat all adopt metallic material there are the following problems but in reality is made:, and do not have elasticity, the continuity of potted line is difficult to guarantee.The pressure ratio that sealing needs is big especially, relies on the pressure of medium itself not reach seal request, and must apply external force on sealing surface.In order to reach sealing effect, often before assembling, carry out the break-in of ball and valve seat, then in assembling with in flange bolt apply and give tight power and reach seal pressure, make the ball valve pressure testing qualified, to make spheroid and valve seat be not linear sealing to the result of break-in like this, but cambered surface sealing, use in the operating mode, a pivotal position is with regard to blow-by again, and the result of break-in simultaneously comes off chromium coating, spheroid is easy to produce scratch, causes sealing pair to leak.2., also have another problem for floating ball formula ball valve, be exactly spheroid bear working medium carry to fall to all having passed to the exit seal circle, so the exit seal circle very easily weares and teares.3., when assembling pretightening force wayward, sealing pair scratch when excessive, the valve rod moment of torsion increases, blow-by when too small will be adjusted with the different pad of thickness, quite trouble.

The purpose of this utility model provides a kind of metal elastic-sealed ball valve that has eccentric spheroid and spheroid position adjustment structure.

The purpose of this utility model is achieved in that it includes valve body, valve seat, spheroid, valve rod, O type metal o-ring, Gland, positioning block, back-up ring, sleeve, spanner, it is characterized in that: valve body by about two valve bodies form, about two valve bodies adopt the nut double-screw bolt to connect, in a left side or right valve barrel, be provided with one and cross the eccentric spheroid of water channel and centre of sphere biasing, sealing surface of seat and valve body center line inclination 3-10 degree, between valve rod and eccentric spheroid, dispose pressure spring, on the valve body of eccentric spheroid bottom, also be provided with spheroid position regulating lever, and corresponding filler and filler gland.In addition, valve seat O RunddichtringO is an austenite stainless steel O RunddichtringO.That leans on two plane of inclination and pressure spring during use just can reach sealing with joint efforts.

The utility model also is included in and is provided with limited post and spacing by stud nut between valve body and the Gland.

The utlity model has following advantage:

1., valve seat insert is metal O type circle rather than overlay cladding, so it can produce very big resiliently deformable, and and spheroid realize sealing, this just need not the break-in spheroid, chromium coating is also protected, and has avoided the scratch phenomenon.

2., the seat angle is the 3-10 degree, seal pressure is not that pretightening force by flange bolt produces like this, is guaranteed that spring has self-adjusting function simultaneously, makes spheroid and sealing surface reach identical well but produce axial force by shock mount on the spheroid.

Though 3. this structure also is a floating ball valve, its suffered medium load is not all to affact on the exit seal circle, is used for spring but decompose a part of masterpiece, so the exit seal circle is protected.

4., because the oblique 3-10 degree of valve seat of the present utility model angle, body adopts opposite opened left and right sides body structure, therefore, has when assembling under the situation of cumulative error and can be compensated by middle flange gasket to adjust.

5., assembly technology is simple and convenient, promptly also need not too big pretightening force without break-in, can guarantee to seal and reduced the moment of torsion of valve rod, therefore reduced energy consumption.Use in addition in the operating mode, also can not rotate after the position with regard to packing less phenomenon, and rational in infrastructure, applied widely, and Maximum operating temperature can reach 425 ℃.

The utility model is described in further detail below in conjunction with accompanying drawing:

Fig. 1 is a sectional structure schematic representation of the present utility model

By shown in Figure 1, the valve body among the figure is made up of left valve barrel 1 and right valve barrel 2, about two valve bodies adopt nut 3 double-screw bolts 4 to connect, and be provided with a gasket seal 8 at connection part.In right valve barrel 2, be provided with one and cross the eccentric spheroid 10 of water channel and centre of sphere biasing, be that valve seat 24 sealing surfaces and valve body center line tilt angle are 5 degree, austenite stainless steel O RunddichtringO 9 also is equipped with at valve seat 24 places, above eccentric spheroid 10, be disposed with valve rod 11, filler 12, Gland 18, positioning block 19, back-up ring 20, sleeve 21, spanner 22, between valve rod 11 and eccentric spheroid 10, also dispose pressure spring 25, between right valve barrel 2 and Gland 18, also be provided with limited post 17 and spacing in addition, can guarantee valve opening by double-screw bolt 13 nuts 14, closed position is accurate.On the right valve barrel 2 of eccentric spheroid 10 bottoms, also be disposed with spheroid position regulating lever 7, corresponding filler 6 and filler gland 5, can finely tune the position of spheroid by regulating lever 7 like this.Part among the figure 15,16 is the label and the rivet of this product in addition, and 23 is the fixing bolt of spanner 22.Adopt above-mentioned left and right sides valve body to divide body structure, then just can guarantee the accuracy on 5 degree inclined-planes, angle in the course of working, could guarantee its sealability after the assembling, that leans on two plane of inclination of valve seat and pressure spring just can reach sealing with joint efforts.The utility model Maximum operating temperature can reach 425 ℃, and Applicable media is high temperature media such as steam, oil product.

Claims

1, a kind of metal elastic-sealed ball valve that is applicable to high temperature high voltage resistant, it includes valve body, valve seat, spheroid, valve rod, O type metal o-ring, Gland, positioning block, back-up ring, sleeve, spanner, it is characterized in that: valve body by about two valve bodies form, about two valve bodies adopt the nut double-screw bolt to connect, in a left side or right valve barrel, be provided with one and cross the eccentric spheroid of water channel and centre of sphere biasing, sealing surface of seat and valve body center line inclination 3-10 degree, between valve rod and eccentric spheroid, dispose pressure spring, on the valve body of eccentric spheroid bottom, also be provided with spheroid position regulating lever, and corresponding filler and filler gland.

2, metal elastic-sealed ball valve according to claim 1 is characterized in that valve seat O RunddichtringO is an austenite stainless steel O RunddichtringO.

3, metal elastic-sealed ball valve according to claim 1 is characterized in that being provided with limited post and spacing by stud nut between valve body and Gland.