CN2514183Y

CN2514183Y - Valve seat assembly in wear-resistance ball valve

Info

Publication number: CN2514183Y
Application number: CN 02204369
Authority: CN
Inventors: 宋永生
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-12-10
Filing date: 2002-02-01
Publication date: 2002-10-02
Anticipated expiration: 2012-02-01

Abstract

The utility model relates to the valve seat component of an abrasion-tolerant ball valve. The abrasion-tolerant ball valve includes two valve bodies (7a, 7b) and a sphere body (6), wherein, the two valve bodies are connected and match with each other and respectively provided with a cylindrical channel (19), the sphere body (6) is mounted in the cavity formed by the two valve bodies, ladder holes are respectively formed at the juncture position between the cavity of the two valve bodies and each channel. The valve seat component has two groups, which are respectively mounted in the ladder holes of the channels of the two valve bodies, each group of valve seat component includes an annular valve seat (5, 21,22,23,26), annular soft elastic materials (2) and an annular bush (1), wherein, the annular valve seat is provided with at least one lubrication groove (4), and the annular soft elastic materials are arranged on the internal diameter surface of the valve seat. When the ball valve is opened or closed or totally closed, the sphere body can tightly contacted with the sphere sealing surface (1a) of the downside bush. An elastic pad (3a) or elastic elements (3b, 3c) can be arranged on the axial outer end of the back of the valve seat.

Description

Valve component in the wear resistance ball valve

Technical field

The utility model relates to a kind of ball valve, particularly the valve component in the wear resistance ball valve.

Technical background

According to the difference of applicable cases, the structure of ball valve roughly can be divided into three major types according to the mounting type of spheroid: floating ball, semifloating ball and fixing ball.The ball valve of floating ball and semifloating ball is applicable to the occasion that pressure medium is not high, pipeline drift diameter is little substantially.

In the floating ball ball valve, valve seat is a Sealing with ball seal, the active force of medium differential pressure and make the supporting member of Sphere orientation in valve body central authorities when also being a fulcrum ball body weight and valve closing.The weight of semifloating spherical ball valve spheroid is then by the upper and lower support plate carrying of spheroid.In fixing spherical ball valve, two axles up and down of spheroid are placed in the bearing in the valve body, and the pressure reduction that spheroid bears and the weight of spheroid are supported by bearing.

With the difference of medium temperature, valve seat generally can use nonmetallic material (common polymer) to make, and is referred to as soft sealing ball valve; Also can use metallic material to make, be referred to as hard seal ball valve.

Running into through regular meeting in the technological process of the conveying solid substance material of various industry utilizes gas or liquid to carry particle or abrasive material dust situations such as (for example: pulverized fuel ash, cement).Although the pressure of the most of medium in these use occasions is not high and usually be normal temperature, the hardness of the abrasive material in the medium is often very high, and their diameter is very little, is enough to enter into valve seat that any material makes and the sealing pair between the spheroid.

The valve seat of floating ball and semifloating spherical structure ball valve, and be that nonmetallic material (soft seal) valve seat resiliently deformable produces when relying on valve body to clamp elastic force or the cushion behind metallic material (hard sealing) valve seat or the elastic force of elastic element form seal pressure between the valve body, spheroid.Be valve seat is pushed to spheroid between the valve seat of the fixedly spherical ball valve of soft, hard sealing and the spheroid, form required seal pressure by the elastic force of valve seat elastic element behind.

The material of soft seal valve seat uses polymer to make substantially, their shortcoming be neither wear-resistant, regime of elastic deformation is also little, that is to say that to can be used in the elastic deformation amount that compensation valve seat elastic force reduces behind the prooving of valve seat little.

For the ball valve of hard sealing, there is following problem:

1. even sprayed the tungsten carbide material of hardness about on the surface of the spheroid of hard seal ball valve and valve seat up to 70HRC, but contain the very high abrasive material medium of hardness for those, the operating mode of gas delivery silica flour for example, what big difference of hardness not between the sealing pair of sphere and valve seat and the medium, spheroid and valve seat also very quick-wearing fall;

2. influenced by spraying coating process condition, manufacturing processing technic and cost etc., the thickness of the hardened layer of spherome surface and valve base surface coating can not be very thick, and the rub proofness of spheroid and valve seat is restricted;

3. with valve seat 90 ° of surface of contact and relative high spherome surfaces of hardness that angular range is wide are arranged when rotating, the valve base surface narrow relatively with seal f ace width, that hardness is lower rubs mutually, its result must be the wear rate of valve seat far above sphere, cause sealing pair on a certain position, the slit to occur.During valve closing, the flow velocity that fluid flows through slit place under the effect of fluid pressure difference becomes big, and fluid at a high speed clips the abrasive material erosion in the medium and washes away the slit spheroid and the valve seat at position all around, causes the very fast reduction in working life of valve.When upstream spheroid and valve seat were damaged, the valve body that is in the downstream, slit also was subjected to strong erosion and washes away, serious erosion and wash away even can get perforation on valve body.

Although the elastic element of the behind of the fixedly spherical ball valve of soft, hard sealing has the ability of the big compensation prooving of valve seat, as do not have other suitable measure, then the hardness of valve seat coating and thickness also are powerless for the higher abrasive material medium of hardness.

In order to prolong the working life of valve, people usually select focusing on of dealing with problems on the more wear-resisting polymer for use for the valve seat of soft sealing ball valve, perhaps the spheroid of hard seal ball valve and the surface of valve seat are carried out various cure process, improve their surface hardness, to increase wear resistance and erosion resistance, erosion.The effect that facts have proved these solutions is not really desirable.

Summary of the invention

The purpose of this utility model provides the valve component in a kind of wear resistance ball valve, and it prolongs the working life of ball valve greatly by antifriction (reduce by reducing friction wearing and tearing) and the dual measure that gives big wear compensation amount in the valve base sealing surface wear.

The purpose of this utility model is achieved through the following technical solutions, a kind of valve component of wear resistance ball valve is provided, described wear resistance ball valve comprises having two a valve bodies cylindrical channel, that work in coordination and connect by some links respectively, one be installed in two body cavities, there is the spheroid of a central passage centre; The inner chamber of described two valve bodies and each passage intersection are formed with a shoulder hole respectively, and described each shoulder hole comprises one respectively near the aperture of channel centerline with away from the macropore of channel centerline; Described valve component has two groups, is installed in respectively in the shoulder hole of each passage of two valve bodies, and every group of valve component comprises: be arranged on the round ring seat in the macropore of passage shoulder hole, the spherical sealing surface of described valve seat contacts with the sealing surface of described spheroid; Along the circumferential direction offer at least one lubrication groove on the spherical sealing surface of described valve seat, store lubricating grease in described the lubricating; And be arranged on a ring lining in the aperture of passage shoulder hole, and it is by the high-abrasive material manufacturing, and the external diameter surface of described lining covers the inside diameter surface of described elastic soft material and the inside diameter surface of described valve seat; Described lining has in the face of spheroid and the spherical sealing surface identical with spherome surface; The axial outer end of described lining at least two grooves that distributing, the degree of depth of described groove is less than the height of the aperture of passage shoulder hole; When utilizing link, between the spherical sealing surface of described lining and the described spherome surface micro-gap is arranged with two valve body relative fixed; When ball valve keying or complete shut-down, described spheroid contacts with the spherical sealing surface of downstream side lining.

In described valve component, also be included in a circular groove of the inside diameter surface of described valve seat; Be arranged on the ring elastic soft material in the circular groove of described valve seat bore surface, be full of slight void in the body of described elastic soft material, comprise lubricating grease in the space, and described elastic soft material has the spherical sealing surface that contacts with spheroid.

In described valve component, described valve seat is made with polymer; The axial outer end of described valve seat is close on the axial end of macropore of valve channel shoulder hole.

In described valve component, described valve seat is made with polymer; In the axial outer end of described valve seat and valve channel, between the axial end of the macropore of shoulder hole cushion is set.

In described valve component, described valve seat is made with polymer; Described valve seat is fixed on the Steel Support of ring, between the axial end of the macropore of the axial outer end of Steel Support and valve channel shoulder hole elastic element is set.

In described valve component, described valve seat is made with polymer; Described valve seat is when free state, and the radius of the spherical sealing surface of described valve seat is less than the radius of described spheroid; When utilizing link with two valve body relative fixed, the radius of the spherical sealing surface of described valve seat equals the radius of described spheroid.

In described valve component, described valve seat is made with metal; Cushion or elastic element are set between the axial end of the macropore of the axial outer end of described valve seat and passage shoulder hole.

In described valve component, on the spherical sealing surface of described metal seat valve, apply Friction-Reducing Coating.

In described valve component, described elastic element is a butterfly spring.

In described valve component, described elastic element is several helical springs.

The utility model has the advantages that:

Because lining is set, and lining is to make with wear-resisting metal or nonmetallic material, the internal surface of metal lining can the coated with hard alloy or integral body make by cemented carbide, it has six effects.

1. isolation valve seat does not allow the medium in valve seat and the valve body fluid passage directly contact, make valve seat exempt from the valve opening and closing process and during valve wide open the abrasive material in the medium to the erosion of valve seat with wash away.

2. when floating ball or keying of semifloating spherical ball valve or complete shut-down, support spheroid when the pressure reduction before and after the valve floats spheroid downstream, the active force of spheroid can or can all not be applied on the valve seat, like this, the pressure that acts on the valve seat reduces greatly, can slow down the wearing and tearing of sealing surface of seat.And lining itself only just is subjected to being clipped in the wearing and tearing of the abrasive material between spherome surface and gasket end sphere when supporting sephere floats.

3. when valve opening and closing, can scrape away the dirt that sticks on the spherome surface.

4. after the employing bush structure, the spheroid of floating ball or semifloating spherical ball valve is fixed (being equivalent to fixedly spherical ball valve), can float downstream hardly under the effect of the pressure reduction of spheroid before and after valve, two valve seats of upstream and downstream this moment seal simultaneously, have improved the sealability of valve.

5. lining can eliminate the influence of pressure-difference fluctuation to valve seat, and the maximum flexibility deformation band that therefore can make full use of polymer system valve seat self compensates its wearing and tearing, increases the service life.

6. be clipped in the huge frictional force that the abrasive material between spheroid and the valve base sealing pair produces, make valve seat, cause the openings of spheroid to be stuck on the valve seat and can not to close fully along with spheroid to the rotation of closing direction the radial compression distortion takes place.The leakage of bayonet socket point, what cause that valve seat is subjected to abrasive material in the medium washes away the very fast damage of valve seat.The rigidity of lining can strengthen valve seat and resist the radial compression deformation ability.

Being clipped in the elastic soft material that contains lubricating grease between valve seat, the lining, is to be used for stoping abrasive grain in the medium to enter sealing pair between spheroid and the valve seat.In the valve opening and closing process, its wiping action can be removed the abrasive material that sticks on the spherome surface, makes it to enter into the rotation of spheroid the sealing pair between spheroid and the valve seat.Lubricating grease in the elastic soft material constantly awards surface of contact and the lubricating with necessity of the sealing pair between valve seat and spheroid between lining and the spheroid.

Valve seat is made by polymer or metallic material.Valve after assembling is finished, the sealing surface of valve seat is the sphere contact with contacting of spherome surface, the sphere contact can reduce the required seal pressure of valve to greatest extent, and low seal pressure has reduced the pressure that acts on the valve seat, helps prolonging the working life of valve; The wear resistance of wide ball face sealing face contact raising valve seat.

On the sealing surface of valve seat, along the circumferential direction have one or several lubrication groove, be marked with lubricating grease in the groove, lubricating grease can form the oil film that continues on the sealing pair between spheroid and the valve seat, reduced the friction factor between sealing pair, reduced abrasive material between the sealing pair be clipped in valve seat and spheroid the wearing and tearing of sealing pair.And this layer oil film also is a kind of good sealing compound, it can strengthen the sealability of sealing pair, reduce required minimum seal pressure between spheroid and valve base sealing pair, can reduce the pressure that acts on the valve seat thus, and the prevention abrasive material constantly enters the sealing pair between valve seat and spheroid.The localized hyperthermia that produces when spheroid and the friction of valve base chamber sealing pair when being stored in lubricating grease in the valve seat and also can absorbing valve opening and closing does not allow high temperature cause the lubricating film fracture, loses lubrication.On the spherical sealing surface of metal seat valve, also can apply Friction-Reducing Coating, strengthen its ability of resisting wearing and tearing.

The soft seal valve seat of common geometry design (also claiming extruding type), lubrication groove on combining above-mentioned lining, elastic soft material and sealing surface of seat constitutes after the valve component of the present utility model, can increase substantially its ability of resisting wearing and tearing.Special geometry soft seal valve seat (for example single oblique plane type, double inclined plane formula or V-shaped groove formula etc.) design, that be intended to increase polymer self elastic deformation amount, lubrication groove on lining in combining the utility model, elastic soft material and the sealing surface of seat constitutes after another valve component of the present utility model, also can maximally utilise the maximum flexibility amount of deformation that its special geometry design is given, further improve its ability of resisting wearing and tearing.

Because cushion or elastic element have the elastic deformation amount more much bigger than polymer material, with they be installed in valve seat behind after, can increase the ability of the compensate for wear of valve seat greatly, they can be pressed to valve seat on the sealing surface of spheroid to produce required, the constant as far as possible elastic force of minimum seal pressure simultaneously, alleviate the wear rate of valve seat.Therefore, for the valve seat of soft seal, a cushion is directly placed in the behind of valve seat, and perhaps the valve seat with polymer system is fixed on the Steel Support of ring, places an elastic element in the behind of Steel Support again; Valve seat for metallic seal, a cushion or elastic element are directly placed in the behind of valve seat, they constitute another valve component of the present utility model, again in conjunction with the elastic soft material that is used to delay the prooving of valve seat in the utility model, lubrication groove on the sealing surface of seat and after the Friction-Reducing Coating that applies on the metal sealing surface of seat, these valve components help to prolong the working life of ball valve more.

Description of drawings

Fig. 1 is equipped with sectional drawing the utility model valve component, the floating ball ball valve.

Fig. 2 is equipped with sectional drawing the utility model valve component, the semifloating spherical ball valve.

Fig. 3 be equipped with the utility model valve component, the fixing sectional drawing of spherical ball valve.

Fig. 4 A and 4B are the local sectional drawings among Fig. 1,2 and 3, that have the soft seal valve component of common geometrical shape (also claiming extruding type) that amplifies, is installed in; Wherein, Fig. 4 A is the view before valve body clamps, and Fig. 4 B is the view after valve body clamps.

Fig. 5 is the partial enlarged drawing that is similar to Fig. 4, is the sectional drawing of single oblique plane type soft seal valve component of process special geometry design in the utility model.

Fig. 6 is similar to Fig. 5, is the sectional drawing of double inclined plane formula soft seal valve component in the utility model.

Fig. 7 is similar to Fig. 5, is the sectional drawing of V-shaped groove formula soft seal valve component in the utility model.

Fig. 8 A to 8H is the sectional view that is similar to the part amplification of Fig. 4; Wherein Fig. 8 A has shown at the soft seal valve seat cushion has been set behind; Fig. 8 B has shown that the soft seal valve seat is fixed on the Steel Support, valve seat is provided with butterfly spring behind and valve body is in the preceding state that clamps; Fig. 8 C is similar to Fig. 8 B, but valve body is in the state after the clamping; Fig. 8 D has shown that the soft seal valve seat is fixed on the Steel Support, valve seat is provided with helical spring state behind; Fig. 8 E has shown the state that the soft seal valve seat is fixed on the another kind of Steel Support, valve seat is provided with butterfly spring behind; Fig. 8 F is similar to Fig. 8 E, but valve seat is provided with helical spring behind; Fig. 8 G has shown the state that the soft seal valve seat is fixed on another Steel Support, valve seat is provided with butterfly spring behind; Fig. 8 H is similar to Fig. 8 G, but valve seat is provided with helical spring behind.

Fig. 9 is the part sectioned view that the soft seal valve seat of the floating of any the utility model valve component, semifloating spherical ball valve is not installed, and has shown that valve seat is subjected to the situation of radial compression distortion.

Figure 10 A to 10C is the sectional view that is similar to the part amplification of Fig. 8; Wherein, Figure 10 A has shown at metal seat valve cushion has been set behind; Figure 10 B has shown at metal seat valve butterfly spring has been set behind; Figure 10 C has shown at metal seat valve helical spring has been set behind.

Embodiment

Shown in Figure 1, a top end of valve rod 9 links to each other with handle 11, and a following end of valve rod 9 is processed into flat tenon 9a, and flat tenon is connected with the flat groove 6a on the spheroid 6, and handle with sleeve 11 can drive spheroid 6 rotations, and ball valve does to open and close motion thus.Floating ball ball valve shown in Figure 1 is made up of lubrication groove 4 on

valve body

7a and 7b, spheroid 6, valve rod 9, filler 10, valve seat 5, lining 1, elastic soft material 2, cushion (or elastic element) 3 and the valve seat 5 etc.Lubrication groove 4 on round ring seat 5 wherein, ring lining 1, ring elastic soft material 2, cushion (or elastic element material) 3 and the valve seat 5 constitutes valve component of the present utility model.Totally two cover round ring seat assemblies are installed in the both sides of the spheroid 6 of same billiard ball valve respectively, are clipped between

valve body

7a and 7b and the spheroid 6.

Respectively increase by a upper backup pad 17 except spheroid 6 upper and lower among Fig. 2 and a lower supporting plate 16 comes the weight of supporting sephere, all the other structures are identical with Fig. 1.Spheroid 6 among Fig. 3 fuses with valve rod 9 and lower valve rod 20 respectively, is placed in the bearing of link 8, is supported the weight and the thrust of valve front and back differential pressure action on spheroid of spheroid 6 by link 8.All the other structures are identical with Fig. 1.

Fig. 1～3 are the full-gear of valve, and the axis of the circulation passage 18 of the axis of the circulation passage 19 of

valve body

7a and 7b and spheroid 6 is on the same straight line at this moment.When

circulation passage

18 and 19 axis were vertical mutually, ball valve was in closed position.Valve rod 9 passes filler 10 and exposes valve body 7, so the medium of ball valve inside can therefrom not flow out.

Fig. 1, Fig. 2 and valve shown in Figure 3 that the utility model valve component is installed all are two way sealeds, and medium can flow into from any one through hole, flows out from another through hole, is not subjected to the restriction of installation direction.

Fig. 4 A and 4B are the partial enlarged drawings of Fig. 1, Fig. 2 or Fig. 3, have shown a valve component of the present utility model, have shown this a part of bond zone of valve body 7a, spheroid 6 and valve component of the present utility model especially.At this, valve component is made up of one or several lubrication groove 4 by certain depth of along the circumferential direction opening on the extruding type valve seat 5 of lining 1, elastic soft material 2, polymer system and its sealing surface 5a.Fig. 4 A has shown the state when bolt, nut 12 (do not draw, can referring to Fig. 1, Fig. 2 or Fig. 3) clamp left valve barrel 7a and right valve barrel 7b (not drawing among the figure).By Fig. 4 A as can be known, under the weight effect of spheroid 6, the part of the ball face sealing face 6b of spheroid 6 contacts with the sealing surface 5a of elastic soft material 2 and extruding type valve seat 5, and the end sphere 1a of lining 1 stands away with the sealing surface 6b of spheroid 6.

In Fig. 4 B, after left valve barrel 7a and right valve barrel 7b (not drawing among the figure) clamp by bolt, nut 12 (seeing Fig. 1, Fig. 2 or Fig. 3), the sphere 1a of lining 1 end is mutually close with the sealing surface 6b of spheroid 6, little clearance 14 is left in the centre, so still has only the friction of spheroid 6 with sealing pair 13 between the extruding type valve seat 5 during the ball valve switch.

Valve component of the present utility model is to reach by frictional force that reduces sealing pair 13 and the later compensation rate of increase valve base sealing surface wear to increase the service life.Reduce the friction factor of sealing pair between spheroid and the valve seat and (minimum seal pressure is meant and guarantees the sealing pair sealing by reducing the required minimum seal pressure of sealing pair, necessary pressure minimum on the sealing surface unit area) reduce to be applied to the active force on the sealing surface of seat, be reduce frictional force between the sealing pair only one or two by way of.

After left valve barrel 7a and right valve barrel 7b clamped, extruding type valve seat 5 was out of shape by the extruding generation pressure elasticity of clamping force, formed required seal pressure on the sealing pair 13 between spheroid 6 and the extruding type valve seat 5.

Meanwhile, the sealing surface 5a of extruding type valve seat 5 is contacting of spherical shape with the sealing surface 6b of spheroid 6.Sphere contact can reduce the required seal pressure of extruding type valve seat 5 to greatest extent, reduced to be applied to pressure on the sealing surface of seat 5a for reaching required seal pressure, and the wide sealing pair 13 of sphere contact has improved the wear resistance of extruding type valve seat 5.When extruding type valve seat 5 is squeezed, in the lubrication groove 4 and the lubricating grease in the elastic soft material 2 overflow, penetrate in the gap 14 and the sealing pair 13 between spheroid 6 and the extruding type valve seat 5 between the sealing surface 6b of the sphere 1a of lining 1 end and spheroid, and in the movement process of the opening and closing of ball valve, spread to equably in sealing pair 13 and the gap 14.The abrasive material particle that contains in the medium is under the promotion of pressure medium; at any time attempt to penetrate among the sealing pair 13; the infiltration that established even tempered oil film can block media pressure in sealing pair 13 has reduced the speed that abrasive grain enters sealing pair 13 in the medium effectively.Along with the ball valve growth of service time, be full of abrasive grain in the sealing pair 13 gradually, the tempered oil film that sticks on the sealing pair 13 is pressed Collapse still to play a part antifriction before by them, does not allow sealing pair 13 be subjected to heavy wear.After tempered oil film was pressed Collapse, the lubricating grease that constantly overflows in the lubrication groove 4 made tempered oil film be regenerated.

One or several that open along circumferencial direction on the sealing surface 5a of extruding type valve seat 5 has in the lubrication groove 4 of certain depth; store a certain amount of lubricating grease; these lubricating grease have not only reduced the friction factor of sealing pair 13; strengthened its sealability; reduced the required minimum seal pressure of sealing pair 13; and can also absorb sealing pair 13 fricative localized hyperthermias when operating ball valve, tempered oil film is not burnt out by frictional heat.

Lining 1 among Fig. 4 A and the 4B is a cirque body, and it is made by polymer or metallic material.Its end is embedded in by transition fit in that aperture of center line of the close circulation passage 19 in the circulation passage 19 (seeing Fig. 1, Fig. 2 or Fig. 3) of valve body 7a, two or more groove 1b is equably distributing on its end circumference, the degree of depth of groove is made the usefulness of dismounting lining less than the height of aperture in the valve body that matches.The other end of lining 1 is a sphere 1a.The internal diameter of lining 1 is identical with the internal diameter of the circulation passage of valve body 19.Two ring linings 1 are installed in the both sides of spheroid 6 respectively, between left valve barrel 7a, right valve barrel 7b are with spheroid 6 (referring to Fig. 1, Fig. 2 or Fig. 3), when valve body 7a and 7b clamp, keeping a small gap 14 between the sphere end 1a of lining 1 and the sealing surface 6b of spheroid 6.Lining 1 is kept apart (seeing Fig. 1, Fig. 2 or Fig. 3) to medium and extruding type valve seat 5 mobile valve body circulation passage 19 in, make valve seat 5 exempt from the valve opening and closing process or during standard-sized sheet the abrasive grain in the medium erosion and wash away.When floating ball or keying of semifloating spherical ball valve or complete shut-down, pressure reduction before and after the valve is pushed spheroid 6 to downstream valve seat 5, after spheroid 6 has floated the distance in gap 14 downstream, the sphere 1a of lining 1 end contacts with the sealing surface 6b of spheroid, lining 1 has blocked spheroid 6 further floating downstream, and this moment, the active force of pressure reduction was mainly supported by the lining 1 in downstream.The extruding of pressure difference active force, valve seat 5 just has been compressed the distance in gap 14, this decrement can obviously not increase the sealing pair 13 original seal pressures between downstream valve seat and spheroid, so downstream sealing surface of seat 5a can not be subjected to pressure reduction and causes, may be the extruding of very big active force and the serious wearing and tearing that cause sometimes.

When the sphere 1a of downstream lining 1 end contacts with ball seal face 6b under differential pressure action, rotation along with spheroid 6, the sphere 1a of downstream lining 1 end can scrape away the dirt that sticks on the ball seal face 6b, does not allow dirt bring in the sealing pair 13.Gap 14 between the sphere 1a of downstream lining 1 end and the ball seal face 6b can constantly obtain the lubricated of the lubricating grease that overflows in the elastic soft material 2, therefore the abrasive grain that is clipped in the gap 14 is lubricated, and has reduced the sphere 1a of downstream lining 1 end and the wear rate of ball seal face 6b.Under the promotion of pressure reduction, just floated the downstream distance of micro-gap 14 of spheroid 6, the sealing pair 13 between upstream valve seat 5 and the spheroid 6 still maintains original seal pressure, and two valve seats of upstream and downstream seal simultaneously, have improved the sealability of valve.

Be clipped between the external diameter of the internal diameter upper shoulder hole of valve seat 5 and lining 1, in material bodies, be full of the elastic soft material 2 that is full of lubricating grease in the slight void, be to be used for stoping abrasive grain in the medium to enter sealing pair 13 between spheroid 6 and the valve seat 5.In the ball valve opening-closing process, its wiping action can be removed the abrasive material that sticks on the spheroid 6 sealing surface 6b, makes it to enter into sealing pair 13 with the rotation of spheroid.Lubricating grease in the elastic soft material 2 constantly gives the sphere 1a of lining 1 end and the gap 14 between the ball seal face 6b and the sealing pair 13 between valve seat 5 and the spheroid 6 lubricating with necessity.

Fig. 5, Fig. 6, Fig. 7 and Fig. 4 are similar, are respectively the extruding type valve seat to be changed into valve component behind monocline surface elastic valve seat 21, double inclined plane elastic seat 22 and the V-shaped groove elastic seat 23.These valve seats are to obtain the elastic deformation amount's bigger than extruding type valve seat among Fig. 45 by the design that changes the valve seat geometrical shape.Dotted line among the figure is the shape that valve body 7a and 7b do not have to clamp preceding valve seat 21,22 and 23, and the spherical radius of their sealing surface of seat 21a, 22a and 23a is less than the radius of spheroid 6; Solid line among the figure is the shape after valve body 7a and 7b clamp, and the spherical radius of sealing surface of seat 21a, 22a and 23a is out of shape the radius that becomes with spheroid 6 and is equated that two sealing surfaces of spheroid and valve seat fit like a glove, and are the contact of spherical shape after resiliently deformable.They can further improve the wear-resistant ability of valve seat 21,22 and 23 after combining elastic soft material 2 and being opened in lubrication groove 4 on the sealing surface of seat.Need not consider that the pressure reduction of valve front and back and the fluctuation of pressure medium can cause the decrement of downstream valve seat 21,22 and 23 to increase after using lining 1, make it to take place the possibility of plastic deformation, valve seat 21,22 and 23 original pre compressed magnitudes of setting increase near the maximum compressibility (being about to take place decrement before the plastic deformation with respect to valve seat 21,22 and 23) in the time of can clamping valve body 7a and 7b thus, have increased them like this and have been used for the amount of compensate for wear.

The structure of Fig. 8 A to 8H is basic identical with Fig. 4, their difference is: cushion 3a (seeing Fig. 8 A) has been set up in the behind at the valve seat 5 of Fig. 4, perhaps valve seat 5 is fixed on Steel Support 5b (seeing Fig. 8 B, 8C, 8D) or 5c (seeing Fig. 8 E, 8F) or the 5d (seeing Fig. 8 G, 8H), set up an elastic element behind at Steel Support again, as butterfly spring 3b or helical spring 3c.Valve seat 21,22 and 23 among Fig. 5,6 and 7 also can be set up cushion or elastic element (not drawing among the figure) with reference to the method for Fig. 8 in their behind.The purpose of setting up cushion or elastic element 3 is, increase the regime of elastic deformation of valve seat, make it the wearing and tearing that enough amount of elasticity compensate sealing surface of seat 5a, 21a, 22a, 23a, and valve seat is pressed against on the sealing surface 6b of spheroid 6 with elastic force constant as far as possible, that satisfy the required minimum seal pressure of sealing pair 13, slow down the wear rate of valve seat.Cushion can be made by nonmetallic material, is a kind of pad that uses existing favorable elasticity to have excellent sealability material to make again; Elastic element can be made by metal or nonmetallic material.The setting of O shape among Fig. 8 D, 8F, 8G and 8H circle 15, be for eliminate medium by valve seat support 5b, 5c or 5d external diameter surface and the clearance leakage between the internal surface of the macropore of circulation passage 19 shoulder holes use.

Fig. 9 is a part sectioned view of ball valve, and valve component of the present utility model is not installed in the ball valve.Spheroid 6 by evolution to closing to closing direction, when spheroid 6 rotates, the abrasive grain that is clipped in the sealing pair 13 between valve seat 24 and the spheroid 6 makes the friction factor of sealing pair 13 sharply increase, when (of seat material of the rigidity deficiency of valve seat itself, particularly after the valve seat excessive wear) time, the frictional force that increases drives valve seat 24 and moves to closing direction with spheroid 6, cause the serious compressive strain of valve seat radial direction, cause that a bit being stuck on the corresponding position of valve seat on the oral area (intersection area of cylindrical hole 18 in the sphere 6b of spheroid and the spheroid) of spheroid 6 (see the A point among Fig. 9), cause valve can not close valve seat leakage fully.The circulation area of valve seat leakage mouth is very little, thus MEDIA FLOW to cross the flow velocity at this position very high, the abrasive grain in the medium is flushed at a high speed on the leakage hole of valve seat, the very fast damage of valve seat.But use after the valve component of the present utility model, (frictional force of seeing Fig. 4～Fig. 8) is very little for sealing pair 13, spheroid 6 is difficult to drive valve seat 5,21,22 or 23 and does the radial compression distortion, (internal diameter of seeing the valve seat 5,21,22 of Fig. 4～Fig. 8) or 23 abuts against on the external diameter of lining 1, and the rigidity of lining 1 also can strengthen valve seat 5,21,22 or 23 and resist the radial compression deformation ability at B point place.

In order to adapt to high-temperature use and more wear-resisting requirement, the polymer system valve seat 5 in the utility model valve component among Fig. 4 also can be made with metal, shown in Fig. 1 OA to 10C.Be the metallic material except valve seat 26 among Fig. 1 OA to 10C, all the other linings 1, elastic soft material 2, lubrication groove 4 and valve seat 26 behind cushion 3a, butterfly spring 3b or the structure of helical spring 3c and principle and Fig. 8 in the same.The sealing surface 26a of the valve seat 26 of metallic material system and the sealing surface 6b of spheroid 6 can pass through cure process, increase wear resistance.Sealing surface 26a is that sphere contacts with sealing surface 6b, and principle is also as the explanation among Fig. 4.Can also apply the wearing and tearing that Friction-Reducing Coating is slowed down sealing surface on the spherical sealing surface 26a of valve seat 26.

Claims

1. the valve component of a wear resistance ball valve, described wear resistance ball valve comprises having two valve bodies (7a, a 7b) cylindrical channel (19), that work in coordination and connect by some links (12) respectively, one be installed in two valve bodies (7a, the 7b) inner chamber, there is the spheroid (6) of a central passage (18) centre, it is characterized in that, the inner chamber of described two valve bodies (7a, 7b) and each passage (19) intersection are formed with a shoulder hole respectively, and described each shoulder hole comprises one respectively near the aperture of passage (19) center line with away from the macropore of passage (19) center line;

Described valve component has two groups, is installed in respectively in the shoulder hole of each passage (19) of two valve bodies (7a, 7b), and every group of valve component comprises:

Be arranged on the round ring seat (5,21,22,23,26) in the macropore of passage (19) shoulder hole, and the spherical sealing surface of described valve seat (5a, 21a, 22a, 23a 26a) contacts with sealing surface (6b) sphere of described spheroid (6); The spherical sealing surface of described valve seat (5a, 21a, 22a, 23a along the circumferential direction offers at least one lubrication groove (4) on 26a), and described lubrication groove (4) lining stores lubricating grease; And

Be arranged on the ring lining (1) in the aperture of passage (19) shoulder hole, it is by the high-abrasive material manufacturing, and the external diameter surface of described lining (1) covers the inside diameter surface of described elastic soft material (2) and the inside diameter surface of described valve seat (5,21,22,23,26); Described lining (1) has in the face of spheroid (6) and the spherical sealing surface (1a) surperficial identical with spheroid (6); The axial outer end of described lining (1) at least two grooves (1b) that distributing, the degree of depth of described groove (1b) is less than the height of the aperture of passage (19) shoulder hole; The internal diameter of described lining (1) is the same big or small with the circulation passage (19) of valve body 7;

When utilizing link (12), has micro-gap (14) between the spherical sealing surface (1a) of described lining (1) and the surface (6b) of described spheroid (6) with two valve bodies (7a, 7b) relative fixed; When ball valve keying or complete shut-down, described spheroid (6) contacts with the spherical sealing surface (1a) of downstream side lining (1).

2. valve component as claimed in claim 1 is characterized in that, also is included in a circular groove of the inside diameter surface of described valve seat; Be arranged on the ring elastic soft material (2) in the circular groove of described valve seat bore surface, be full of slight void in the body of described elastic soft material (2), comprise lubricating grease in the space, and described elastic soft material (2) has the spherical sealing surface that contacts with spheroid.

3. valve component as claimed in claim 2 is characterized in that, described valve seat (5,21,22 and 23) is made with polymer; The axial outer end of described valve seat (5,21,22 and 23) is close on the axial end of the macropore of shoulder hole in the valve channel (19).

4. valve component as claimed in claim 3 is characterized in that, described valve seat (21) is single oblique plane type valve seat.

5. valve component as claimed in claim 3 is characterized in that, described valve seat (21) is a double inclined plane formula valve seat.

6. valve component as claimed in claim 3 is characterized in that, described valve seat (21) is a V-shaped groove formula valve seat.

7. valve component as claimed in claim 2 is characterized in that, described valve seat (5,21,22 and 23) is made with polymer; Between the axial end of the macropore of shoulder hole cushion (3a) is set in the axial outer end of described valve seat (5,21,22 and 23) and the valve channel (19).

8. valve component as claimed in claim 2 is characterized in that, described valve seat (5,21,22 and 23) is made with polymer; Described valve seat be fixed on ring Steel Support (5b, 5c, 5d) on, in the axial outer end of Steel Support and valve channel (19), be provided with between the axial end of the macropore of shoulder hole elastic element (3b, 3c).

9. valve component as claimed in claim 2 is characterized in that, described valve seat (5,21,22 and 23) is made with polymer; Described valve seat is when free state, and the radius of the spherical sealing surface of described valve seat (5a, 21a, 22a and 23a) is less than the radius of described spheroid (6); (7a, 7b) during relative fixed, the radius of the spherical sealing surface of described valve seat (5a, 21a, 22a and 23a) equals the radius of described spheroid (6) with valve body when utilizing link (12).

10. valve component as claimed in claim 2 is characterized in that, described valve seat (26) is made with metal; The cushion (3a) that in the axial outer end of described valve seat (26) and valve channel (19), is provided with between the axial end of the macropore of shoulder hole.

11. valve component as claimed in claim 2 is characterized in that, described valve seat (26) is made with metal; In the axial outer end of described valve seat (26) and valve channel (19), be provided with between the axial end of the macropore of shoulder hole elastic element (3b, 3c).

12., it is characterized in that the spherical sealing surface (26a) of described valve seat (26) is gone up the coating Friction-Reducing Coating as claim 10 or 11 described valve components.

13., it is characterized in that described elastic element is butterfly spring (3b) as claim 8 or 11 described valve components.

14., it is characterized in that described elastic element is some helical springs (3c) as claim 8 or 11 described valve components.