CN209278526U - A kind of hard sealing and leakage rate grade reaches V grades of sleeve adjusting valve - Google Patents

Abstract

The utility model discloses a kind of hard sealing and leakage rate grade reaches V grades of sleeve adjusting valve, including valve body, sleeve is connected on the valve body, cooperation is equipped with spool in the sleeve, is equipped with valve deck at the top of the sleeve, is combined with valve rod on the valve deck, the sleeve is equipped with gasket slot, installation is equipped with gasket in the gasket slot, and bolt is equipped between the valve deck and valve body, is connected with nut on the bolt.The utility model compared with prior art the advantages of be: due to digging gasket slot on sleeve, it is nonmetallic for metal and very stiff and demanding contact of metal when sleeve and valve body, valve deck cooperation contact to be contacted with soft seal pad, the rigidity cooperated between valve seat and valve body is improved, makes whole valve seat, valve deck after the assembly is completed will not be because of the inclination that each bolt pretightening is different and generates.

Description

A sleeve regulating valve with hard seal and leakage level up to V

technical field

The utility model relates to the field of mechanical valves, in particular to a sleeve regulating valve with a hard seal and a leakage level up to V level.

Background technique

In the chemical industry, as an important control unit, the regulating valve drives the actuator to change the position of the spool through signal changes to change the final control element of the medium flow, pressure, temperature, liquid level and other process parameters. While playing a regulating role, under some working conditions, it is necessary to have high sealing performance when closing. Under the known technical background, it is difficult for the regulating valve to achieve high sealing performance. Generally, the leakage level required to reach IV level is qualified. It is difficult to achieve the leakage rating of Class V.

Utility model content

The technical problem to be solved by the utility model is to provide a regulating valve with large V-level leakage registration for the above problems.

In order to solve the above technical problems, the technical solution provided by the utility model is: a sleeve regulating valve with a hard seal and a leakage level of V level, including a valve body, a sleeve is connected to the valve body, and the sleeve A valve core is fitted in the barrel, a valve cover is installed on the top of the sleeve, a valve stem is fitted on the valve cover, a gasket groove is provided on the sleeve, and a gasket is installed in the gasket groove , Bolts are arranged between the valve cover and the valve body, and nuts are connected to the bolts.

Compared with the prior art, the utility model has the advantages that since the sealing gasket groove is dug on the sleeve, when the sleeve is in contact with the valve body and the valve cover, it is a hard contact between metal and metal rather than metal and soft sealing gasket. The rigidity of the cooperation between the valve seat and the valve body is improved, so that after the overall assembly is completed, the valve seat and the valve cover will not be tilted due to the different pre-tightening forces of the bolts.

By controlling the depth of the gasket groove and the thickness of the gasket on the valve seat and the sleeve, the exposed height of the gasket can be controlled, the compression of the gasket can be ensured, and the service life and sealing performance of the gasket can be improved.

If there is no groove on the sleeve, the valve seat and bonnet will be tilted, which will affect the coaxiality and parallelism between the valve seat and the valve core, resulting in the sealing surface of the valve core and the valve seat not being in full contact, resulting in leakage , The friction between the sealing surface of the spool and the sealing surface of the sleeve increases with time, resulting in greater leakage.

As an improvement, the gasket grooves are respectively arranged at the mating joints of the sleeve, the valve body and the valve cover.

As an improvement, the gasket groove and the gasket adopt an interference fit, the valve body and the sleeve adopt an overfit, and the sleeve and the valve cover adopt an overfit.

As an improvement, the valve stem is connected to the top of the valve core through bolts, and the top of the valve core is provided with a central hole.

As an improvement, the valve stem is a stepped shaft.

Description of drawings

Figure 1 is a structural schematic diagram of a sleeve regulating valve with a hard seal and a leakage level up to V.

Figure 2 is an enlarged view of the connection between the upper part of the sleeve and the valve body and valve cover of a sleeve regulating valve with a hard seal and a leakage level of V.

Figure 3 is an enlarged view of the connection between the lower part of the sleeve and the valve body of a sleeve regulating valve with a hard seal and a leakage level up to V.

Fig. 4 is a schematic diagram of a known sleeve structure.

Fig. 5 is a schematic diagram of the contact of the sealing surface after the sleeve is tilted.

As shown in the figure: 1. Valve body 2. Valve core 3. Sleeve 4. Bonnet 5. Valve stem 6. Gasket groove 7. Gasket 8. Bolt 9. Nut.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in further detail.

When the utility model is actually implemented, a sleeve regulating valve with a hard seal and a leakage level of V level includes a valve body 1, and a sleeve 3 is connected to the valve body 1, and the sleeve 3 is fitted with a A valve core 2 is provided, a valve cover 4 is installed on the top of the sleeve 3, a valve stem 5 is fitted on the valve cover 4, a gasket groove 6 is arranged on the sleeve, and a device is installed in the gasket groove. There is a gasket 7, a bolt 7 is arranged between the valve cover 4 and the valve body 1, and a nut 9 is connected to the bolt 8.

The sealing gasket grooves 6 are respectively provided at the mating joints of the sleeve 3 , the valve body 1 and the valve cover 4 .

The gasket groove 6 and the gasket 7 adopt an interference fit, the valve body 1 and the sleeve 3 adopt an overfit, and the sleeve 3 and the valve cover 4 adopt an overfit.

The valve rod 5 is connected to the top of the valve core 2 by bolts, and the top of the valve core 2 is provided with a central hole.

The valve stem 5 is a stepped shaft.

By controlling the depth of the gasket groove and the thickness of the gasket on the valve seat and the sleeve, the exposed height of the gasket can be controlled, the compression amount of the gasket can be ensured, and the service life and sealing performance of the gasket can be improved.

The working principle of the utility model: as shown in the figure, the sleeve regulating valve digs the sealing gasket groove on the sleeve, and when the sleeve is in contact with the valve body and the valve cover, it is a metal-to-metal hard contact rather than a metal-to-soft contact. The gasket and the contact improve the rigidity of the fit between the sleeve and the valve body, so that the sleeve and the valve cover will not be tilted due to the different pre-tightening forces of the nuts after the overall assembly is completed.

By controlling the depth of the gasket groove, the thickness of the gasket and the thickness of the gasket on the sleeve, the exposed height of the gasket can be controlled, and the compression amount of the gasket can be ensured. It is enough for the fitter nut to be tightened to the end, and there will be no excessive compression of the gasket. More damage to the gasket or too little leakage will improve the service life and sealing performance of the gasket.

If there is no groove on the sleeve, the sleeve and bonnet will be tilted, which will affect the coaxiality and parallelism between the valve seat and the valve core, resulting in that the sealing surface of the valve core and the sleeve valve seat sealing surface cannot be fully contacted. , and leakage occurs, the friction between the sealing surface of the spool and the sealing surface of the sleeve increases with time, resulting in an increasing amount of leakage.

The utility model and its implementation have been described above. This description is not restrictive. What is shown in the drawings is only one implementation of the utility model, and the actual structure is not limited thereto. All in all, if a person of ordinary skill in the art is inspired by it, without departing from the purpose of the utility model, without creatively designing a structural method and embodiment similar to the technical solution, it shall be protected by the utility model scope.

Claims (5)

1. A sleeve regulating valve with a hard seal and a leakage level of V grade, characterized in that: it includes a valve body (1), and the valve body (1) is connected with a sleeve (3), and the sleeve A spool (2) is fitted inside the barrel (3), a bonnet (4) is installed on the top of the sleeve (3), and a valve stem (5) is fitted on the bonnet (4). A gasket groove (6) is provided on the top, and a gasket (7) is installed in the gasket groove, and a bolt (8) is arranged between the valve cover (4) and the valve body (1), and the bolt (8) upper connection is provided with nut (9). 2. A sleeve regulating valve with a hard seal and a leakage level of V according to claim 1, characterized in that: the gasket grooves (6) are respectively arranged on the sleeve (3) and the valve body ( 1) and the mating joint of the valve cover (4). 3. A sleeve regulating valve with a hard seal and a leakage level of V according to claim 1, characterized in that: the gasket groove (6) and the gasket (7) adopt an interference fit, and the valve The body (1) and the sleeve (3) are overfitted, and the sleeve (3) and the bonnet (4) are overfitted. 4. A sleeve regulating valve with a hard seal and a leakage level of V according to claim 1, characterized in that: the valve stem (5) is connected to the top of the valve core (2) by bolts, and the valve core (2) There is a center hole on the top. 5. A sleeve regulating valve with a hard seal and a leakage level up to V according to claim 1, characterized in that: the valve stem (5) is a stepped shaft.