CN2088182U

CN2088182U - Gate valve

Info

Publication number: CN2088182U
Application number: CN 91201638
Authority: CN
Inventors: 赵玉生; 李希胜; 赵洪彪
Original assignee: TIANZHU VALVE PLANT SHUNYI COU
Current assignee: TIANZHU VALVE PLANT SHUNYI COU
Priority date: 1991-02-01
Filing date: 1991-02-01
Publication date: 1991-11-06

Abstract

The utility model relates to a gate valve, comprising a valve body, a flashboard, a valve rod, etc. The gate valve is characterized in that the outer surface of the flashboard is provided with a coating layer made of elastic material. The inner of the passage of valve body is provided with a dummy club which is arranged at the vertical lower part of the flashboard, and the shape of the dummy club is the same with that of the lower end of the flashboard. Since the sealing pair is formed by the combined action of an elastic surface and a rigid surface, the sealing effect is good and the service life is long.

Description

Gate valve

The utility model relates to a kind of gate valve, is applicable in the water, steam, gas fitting system of aspects such as oil, chemical industry, power station, urban construction.

Existing gate valve, flashboard are to be formed by metal material processing, and it forms sealing pair with valve body, to connect and to block flowing medium.Because the sealing pair is made of two rigid metal surfaces, therefore requirement on machining accuracy is higher, for guaranteeing the seal request of valve, the general solution that adopts is in valve channel, the position of flashboard below is provided with a pit, and this pit can be one-body molded when casting, when needs block flowing medium, flashboard inserts downwards in this pit, to form labyrinth seal.But there is following inevitable defective in this sealing configuration: (1) is easy to have medium, impurity in the pit inner product because valve channel has pit, if service time is long, and after the medium generation qualitative change of accumulating, contaminated liquid medium very easily; (2) pit in the valve body has increased the flow resistance coefficient of liquid, and it is not smooth to make it circulation; (3) flashboard is done upper and lower to-and-fro motion in valve body, the internal surface of flashboard and valve body inner bore produces sliding friction, because the corrosion of flowing medium, the perhaps wearing and tearing of impurity in the fluid reduce the light knot degree of flashboard and valve hole internal surface two metal surfaces, thereby increase friction factor, not only operation inconvenience, and aggravate wearing and tearing, and have a strong impact on the sealing effect of valve, therefore the working life of this valve is lower.

The purpose of this utility model is to overcome the deficiencies in the prior art and a kind of good seal performance is provided, and valve channel is smoothly unimpeded, and the circulation coefficient is big, operate light, the gate valve of long service life.

The purpose of this utility model is achieved in that a kind of gate valve, includes valve body, flashboard, valve rod, valve gap, valve gap connects with the upper flanges of valve body, valve rod upper end is fixedly connected with handwheel, and lower end and Stem Mut are spirally connected, and Stem Mut is connected in the through hole on the flashboard; It is characterized in that the outer surface of flashboard has the clad that one deck is made of elastic material; The passage of valve body is a through state, and the inherent flashboard vertical lower of this passage has a boss, and this boss slightly is raised in the internal diameter of valve body, and its shape is identical with the shape of flashboard lower end surface, and the normal profile of boss is taper.

The utility model is not that metal surface by two rigidity constitutes with prior art its sealing pair of comparing that different is, but is formed by an elastic surface and a rigid surface acting in conjunction.Its sealing mechanism is under the effect of external force, and combining closely with the rigid surface of valve body after the elasticity clad generation resiliently deformable on the flashboard forms good face seal.Therefore need not to be provided with pit in the valve channel, can not accumulate medium and impurity and reduce flow resistance coefficient, it is level and smooth smooth that liquid medium is circulated in valve channel, helps avoiding the corrosion and the wearing and tearing of each parts in the valve body again, prolonged the working life of valve greatly.

Because the utility model is widely used in the supply and drain water system, consider hygienic requirements, the flashboard outer surface is surrounded by the clad that one deck is made of novel synthetic rubber Ethylene Propylene Terpolymer material, and flashboard and clad utilize the overall sulfur metallization processes, compact structure is reliable, and meets sanitary standard.

The accompanying drawing drawing is described as follows:

Fig. 1 is the utility model structural representation.

Fig. 2 is the utility model valve body structure schematic representation.

Fig. 3 Fig. 4 is the utility model flashboard structure schematic representation.

Describe the utility model in detail below in conjunction with embodiment and accompanying drawing thereof.

The utility model is made up of operative section and do-part two-part as seen from Figure 1.Operative section is identical with prior art, is made of handwheel 8, valve gap 5, valve rod 4 etc.Valve gap 5 is connected with the upper flange of valve body 1, and valve rod 4 is housed in the center hole of valve gap 5.The upper end of valve gap 5 is connected with gland 6, and gland liner 7 is housed in the gland 6.The upper end of valve rod 4 has a step, this pillow block rank diameter is greater than the internal diameter of lining 7, therefore after gland liner 7 and gland 6 installations, can define moving axially of valve rod 4, make it and to rotate, one flexible gland ring 9 is installed in the upper end of gland liner 7, elastic washer 10 is installed, can prevent the outer leakage at gland position effectively in the connection place of gland 6 and valve gap 5.

Do-part of the present utility model is made of valve body 1, flashboard 2, Stem Mut 3 etc.Valve body 1 is the threeway shape, and each outlet end has connecting flange respectively.Fig. 2 illustrates the structure of valve body 1, and the upright opening 13 of valve body 1 is a square opening, and this square opening extends downward on the sidewall of valve body 1 passage, and the lower end of square hole has an inside tapering, and two cornices of square hole have two guide ledges 14, in this square hole flashboard are installed.Valve body 1 passage is a through state, in passage, is positioned at the flashboard vertical lower and has a boss 11, and the internal diameter of the slightly protruding valve body 1 of this boss, the shape of this boss is identical with the shape of flashboard 2 lower end surfaces, and the normal profile of boss 11 is taper.When flashboard 2 is pressed in the boss position downwards, because the boss site pressure is bigger, the elasitic layer distortion on the flashboard 2 is bigger, forms good face seal effectively.

Fig. 3 Fig. 4 illustrates the structure of flashboard 2, and the upper end of flashboard 2 has an open-work as can be seen from Figure, and Stem Mut 3 is installed in this open-work, and the thread section of this Stem Mut and valve rod 4 lower ends is spirally connected.Flashboard 2 both sides have two guiding grooves, and its shape is identical with guide ledges 14 on the valve body.The lower end outer surface of flashboard 2 has the clad 12 that one deck is made of elastic material.This clad is made of novel synthetic rubber Ethylene Propylene Terpolymer in the present embodiment, and has adopted the overall sulfur metallization processes, compact structure, and difficult drop-off meets health conditions requiring again.

Working principle of the present utility model is when rotating handwheel 8, and handwheel 8 drives valve rods 4 and rotates, by Stem Mut 3, drive flashboard 2 and pump, thus conducting or block flowing medium.

To sum up state, the utility model can overcome the prior art deficiency fully, has good seal performance, and the advantage of long service life meets again hygienic requirements. The utility model can be made series of products according to standard.

Claims

1, a kind of gate valve, include valve body (1), flashboard (2), valve rod (4), valve gap (5), valve gap (5) connects with the upper flange of valve body (1), and valve rod (4) upper end is fixedly connected with handwheel, lower end and Stem Mut (3) are spirally connected, and Stem Mut (3) is connected in the through hole on the flashboard (2); It is characterized in that the outer surface of flashboard (2) has the clad (12) that one deck is made of elastic material; The passage of valve body (1) is a through state, and inherent flashboard (2) vertical lower of this passage has a boss (11), and this boss slightly is raised in the internal diameter of valve body (1), and its shape is identical with the shape of flashboard (2) lower end surface, and the normal profile of boss (11) is taper.

2,, it is characterized in that the clad of elasticity clad (12) for constituting of flashboard (2) outer surface by ethylene-propylene-non-conjugated diene rubber according to the gate valve of claim 1.