CN201145060Y

CN201145060Y - Hard seal ball valve

Info

Publication number: CN201145060Y
Application number: CNU2007201987105U
Authority: CN
Inventors: 吴剑
Original assignee: Shanghai High & Low Pressure Valve Co Ltd
Current assignee: Shanghai High & Low Pressure Valve Co Ltd
Priority date: 2007-11-30
Filing date: 2007-11-30
Publication date: 2008-11-05
Anticipated expiration: 2017-11-30

Abstract

The utility model relates to a hard sealing ball valve comprising a ball body (12), a valve seat (130) and a valve body (14). The valve seat (130) is made of metal; a sealing ring (131), a clamp ring (132) and a butterfly spring (133) are arranged in turn on the valve seat (130) and the valve body (14). The hard sealing ball valve has the advantages of greatly widening the application range of the ball valve and being used under the operating conditions of high temperature, high pressure or a medium containing particulates.

Description

Hard seal ball valve

Technical field

The utility model relates to a kind of ball valve, relates in particular to the structure between the spheroid and valve seat in this ball valve.

Background technique

Ball valve mainly is to be used for blocking and the ducted medium of conducting.Because its circulation area was consistent with the endoporus of pipeline after ball valve was opened, so resistance is very little, the essentially no pressure loss is so be widely used in the many fields of oil, chemical industry, medicine, metallurgy, mine, food, urban construction or the like.If cooperate, can also carry out the adjusting of flow, pressure to ducted medium with the adjustment type final controlling element.

At present, because the seal form that ball valve adopted is that teflon is in the majority, serviceability temperature is the highest can only to reach 150 ℃, on the operating mode of using, be very restricted,, improved its temperature operating mode and scope (maximum operation (service) temperature≤350 ℃) even adopted the teflon of enhancement mode, but because the characteristic of nonmetallic material determines, the hardness of sealing material can't be compared with metal, and the extruding that is subjected to foreign matter in pipeline just causes damage easily, thus seal failure.Structural type is seen Fig. 1.Among the figure: handle 1, back-up ring 2, limiting board 3, screw 4, Gland 5, filler 6, valve rod 7, auxiliary valve body 8, pad 9, nut 10, double-screw bolt 11, spheroid 12, valve seat 13, valve body 14.

As seen from Figure 2: because the material of valve seat is teflon 15 (PTFE), if contain the bigger particle of hardness in the pipeline, then very likely carry out being mixed between spheroid and the seal valve seat in the switching process at spheroid, press against and hinder sealing surface of seat, scratch spherome surface, thereby cause leakage.Among the figure: valve rod 7, spheroid 12.

Summary of the invention

The utility model technical issues that need to address have provided a kind of hard seal ball valve, are intended to solve above-mentioned defective.

In order to solve the problems of the technologies described above, the utility model is achieved through the following technical solutions:

The utility model comprises: spheroid, valve seat, valve body; Described valve seat is the metal wood property; Also settle seal ring, trim ring, belleville spring successively at valve seat and valve body.

Compared with prior art, the beneficial effects of the utility model are: make the using scope of ball valve widen greatly, can use in High Temperature High Pressure, perhaps contain in the medium under the operating mode of granular substance.

Description of drawings

Fig. 1 is a ball-valve structure schematic representation in the prior art;

Fig. 2 is an I place enlarged view among Fig. 1;

Fig. 3 is the utility model structural representation;

Fig. 4 is a ring structure schematic representation in the utility model;

Embodiment

Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail:

By Fig. 3, Fig. 4 as seen: the utility model comprises: spheroid 12, valve seat 130, valve body 14; Described valve seat 130 is metal wood property; Also settle seal ring 131, trim ring 132, belleville spring 133 successively at valve seat 130 and valve body 14;

Described seal ring 131 shapes are annulus that form with Expanded graphite 1310 compactings, and its cross section is a square, and its inside accompanies one or more layers Stainless Steel Cloth 1311; To increase the intensity of Expanded graphite.

The structural type that the utility model adopts is that metallic sealing section is faced in metallic seal, wherein utilize the supersonic speed spray welding technology at the spherome surface material of surfacing high hardness equably, as seal face materials such as Tungsten carbite, department too upright No. 20 or nickel 60, thickness 0.25～0.45mm, hardness number 〉=58HRC (take charge of too upright No. 20, the hardness of Tungsten carbite is higher); Same, sealing materials such as valve base sealing surface build-up welding Si Taili cemented carbide or surfacing Tungsten carbite, hardness number 〉=55HRC (taking charge of too upright No. 01) can not be used in the operating mode that medium contains grit thereby solved ball valve.

In addition, owing to adopted metallic seal, overcome the not high shortcoming of serviceability temperature of soft sealing.Make the serviceability temperature of ball valve can reach (refractory alloy steel or Austenitic Stainless Steel series) more than 500 ℃.

Except the motive sealing performance that guarantees spheroid and valve base chamber, reveal between valve seat and valve body in order to prevent medium, so increase static seal one in the valve seat back---the Expanded graphite ring.The folder Stainless Steel Wire is to strengthen the intensity of Expanded graphite in this Expanded graphite seal ring, and its effect is similar to architectural reinforced concrete construction.Expanded graphite is kind of a resistant to elevated temperatures material, and its serviceability temperature can surpass 500 ℃, and temperature is high more, and its sealing effect is good more.

In addition, under high-temperature condition, make the dumb phenomenon of valve switch that spheroid and valve seat locking cause in order to solve metal seal ball valve owing to moving for a long time, so increase floating installation one a valve seat back---a belleville spring promptly is installed in the valve seat back.Its effect is as follows:

1. at ordinary times under the situation, the dish spring makes it push the spheroid direction to because the effect of prestressing has individual active force to valve seat, keeps sealing;

2. under the situation of valve seat locking,, can produce an active force, make valve seat motion compresses dish spring backward along with the rotation of spheroid.Produce a relative displacement between valve seat and the spheroid because the compression of dish spring makes, thereby eliminated the generation of locking situation.

Because the utility model has adopted the structural type of metal hard-sealing, make that ball valve can be used in that the medium situation is comparatively abominable, under the working condition of High Temperature High Pressure, enlarged the use field and the Applicable scope of ball valve, its prospect is very optimistic.

Claims

1. a hard seal ball valve comprises: spheroid (12), valve seat (130), valve body (14); It is characterized in that: described valve seat (130) is the metal wood property; Also settle seal ring (131), trim ring (132), belleville spring (133) successively at valve seat (130) and valve body (14).

2. hard seal ball valve according to claim 1, it is characterized in that: described seal ring (131) shape is an annulus that forms with Expanded graphite (1310) compacting, its cross section is a square, and its inside accompanies one or more layers Stainless Steel Cloth (1311).