CN205639657U - Can trade two core stop valves - Google Patents

Abstract

The utility model discloses a replaceable double-core stop valve, which comprises a hand wheel, a valve stem nut, a bracket, a sealing ring, a sealing liner, a valve stem, a valve cover, a wound gasket, a self-repairing double-sealed valve core, a comb flow cover, detachable valve seat, valve body; the self-repairing double-sealed valve core forms a secondary sealing structure with the valve seat cone and plane. This secondary sealing structure greatly improves the service life of the valve and also improves Sealing performance: The detachable valve seat, valve body, valve stem, and self-repairing double-sealed valve core are all forged, which greatly improves the density of the valve body. Under severe working conditions, fatigue cracks are not easy to occur, and the reliability of long-term use High; when the valve is being maintained, the valve cover can be taken out, and the self-repairing double-sealed valve core, comb cover and detachable valve seat can be replaced directly, realizing the characteristics of rapid maintenance.

Description

A replaceable double core globe valve

technical field

The utility model relates to the field of drainage and sewage valves, in particular to a replaceable double-core stop valve.

Background technique

At present, the drainage and sewage pipelines of power plants are equipped with stop valves. Although the current stop valve technology is relatively mature, the current use of stop valves still does not fully meet the long-term sealing life and rapid replacement requirements of the drainage and sewage system of power plants. The main disadvantages of the current use of stop valves are: Sealing, once the single-stage seal fails, the entire seal will fail; the seal of the valve adopts the method of disassembly and assembly as a whole, once it needs to be replaced, the entire valve needs to be removed, and all the sewage in the entire pipeline will leak, causing environmental pollution.

Therefore, according to the stringent requirements of the drainage and sewage system of the power plant, a stop valve is required that can meet the long-term sealing requirements and can replace the valve core and other wearing parts without disassembling the entire valve.

Utility model content

The utility model aims at the deficiencies of the above-mentioned prior art, and provides a replaceable double-core stop valve, which solves the long-term sealing requirements of the drainage and sewage pipelines in power plants and the problems of convenient maintenance. The specific technical scheme adopted is:

A replaceable double-core globe valve, including a hand wheel, a stem nut, a bracket, a sealing ring, a sealing gasket, a valve stem, a valve cover, a wound gasket, a self-repairing double-sealed valve core, a comb cover, and a detachable Valve seat, valve body; the internal fluid channel of the valve body is an inclined "Z" shape; the detachable valve seat is provided with a sealing surface in the shape of an inner cone, and the sealing surface and the self-repairing double-sealed valve core The sealing surface in the shape of the outer conical surface provided at the front end of the valve matches, and the detachable valve seat is installed inside the valve body; the comb flow cover is installed outside the self-repairing double-seal valve core; the wound gasket is installed on the valve cover and Between the valve bodies, the valve cover is installed on the valve body; the sealing ring and the sealing gasket are arranged in the valve cover and wrap the valve stem; the bracket is installed on the valve cover; the valve stem nut is fixed on the upper end of the bracket The part is connected with the valve stem by threads; the hand wheel is set at the top of the replaceable double-core globe valve and connected with the valve stem.

In the preferred technical solution, the detachable valve seat, valve body, valve stem, and self-repairing double-sealed valve core are all forged.

In a further preferred technical solution, a spring is arranged inside the self-repairing double-seal valve core.

In a further preferred technical solution, the wound gasket is made of stainless steel.

The specific implementation process of a replaceable double-core globe valve is as follows:

First, adjust the bonnet to press the wound gasket tightly, and then it is tightly combined with the valve body; secondly, rotate the handwheel to drive the valve stem to move downward to close the valve; firstly, the self-repairing double-seal valve core and the cone surface seal of the valve seat are completed, that is, First-level sealing; when the valve continues to close down, the spring in the self-repairing double-seal spool is compressed until the end of the spring stroke, and the self-repairing double-seal spool and the plane of the valve seat are sealed at the end plane, that is, the second-level seal; When the valve is opened, the secondary seal breaks away first, the spring recovers, and then the primary seal breaks away to complete the full opening; when the valve is in maintenance, the valve cover can be taken out, and the self-repairing double-seal valve core, comb cover and disassembly can be replaced directly. Type valve seat.

By adopting the above scheme, compared with the prior art, a replaceable double-core globe valve of the present invention has the following technical effects:

1. The secondary sealing structure composed of self-repairing double-sealing spool, conical surface and flat surface of the valve seat, this secondary sealing structure greatly improves the service life of the valve, and also improves the sealing performance of the valve.

2. The detachable valve seat, valve body, valve stem, and self-repairing double-seal valve core are all forged, which greatly improves the density of the valve body. Under severe working conditions, fatigue cracks are not easy to occur, and the long-term use reliability is high. .

3. When the valve is in maintenance, the valve cover can be taken out, and the self-repairing double-sealed valve core, comb cover and detachable valve seat can be directly replaced, realizing the characteristics of rapid maintenance.

4. The wound gasket is made of stainless steel, which has good chemical stability and corrosion resistance.

Description of drawings

Fig. 1 is a schematic cross-sectional structure diagram of a replaceable double-core stop valve of the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below in combination with specific examples and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and not intended to limit the scope of the present invention. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessarily confusing the concept of the present invention.

As shown in Figure 1: a replaceable double-core globe valve, including a hand wheel 1, a stem nut 2, a bracket 3, a sealing ring 4, a sealing gasket 5, a valve stem 6, a valve cover 7, a wound gasket 8, Self-repairing double-seal valve core 9, comb cover 10, detachable valve seat 11, valve body 12; the internal fluid channel of the valve body 12 is an inclined "Z" shape; the detachable valve seat 11 A sealing surface in the shape of an inner cone is provided, which matches the sealing surface in the shape of an outer cone provided on the front end of the self-repairing double-seal valve core 9, and the removable valve seat 11 is installed inside the valve body 12; The comb cover 10 is installed on the outside of the self-repairing double-seal valve core 9; the wound gasket 8 is installed between the valve cover 7 and the valve body 12, and the valve cover 7 is installed on the valve body 12; the sealing ring 4 is sealed The gasket 5 is arranged in the valve cover 7 and wraps the valve stem 6; the bracket 3 is installed on the valve cover 7; the valve stem nut 2 is fixed on the upper end of the bracket 3 and connected with the valve stem 6 by threads; The hand wheel 1 is set at the top of the replaceable double-core globe valve and connected with the valve stem 6;

The removable valve seat 11, valve body 12, valve stem 6, and self-repairing double-seal valve core 9 are all forged;

A spring 91 is arranged inside the self-repairing double-sealed spool 9;

The spiral wound gasket 8 is made of stainless steel.

As shown in Figure 1: In the actual use process, firstly adjust the valve cover 7 to compress the wound gasket 8, and combine it tightly with the valve body 12, and then rotate the handwheel 1 to drive the valve stem 6 to move downward to close the valve; It is the conical seal between the self-repairing double-seal spool 9 and the valve seat 11, that is, the first-level seal; when the valve continues to close down, the spring 91 in the self-repairing double-seal spool 9 is compressed until the stroke of the spring 91 ends, and the self-repair The plane of double-sealed valve core 9 and valve seat 11 is sealed in the end plane, that is, the secondary seal; when the valve is opened, the secondary seal is disengaged first, the spring 91 recovers, and then the primary seal is disengaged to complete the full opening; the valve is under maintenance When the bonnet 7 can be taken out, the self-repairing double-seal valve core 9, the comb cover 10 and the detachable valve seat 11 can be replaced directly, which realizes the characteristics of rapid maintenance.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the scope of protection of the present utility model. Any modifications and equivalent replacements made within the spirit and principles of the present utility model are included in this utility model. within the scope of protection of utility models.

Claims (2)

1. A replaceable double-core stop valve, including handwheel, stem nut, bracket, sealing ring, sealing gasket, valve stem, valve cover, wound gasket, self-repairing double-sealed valve core, comb cover, dismantling Installed valve seat, valve body; it is characterized in that: the internal fluid passage of the valve body is an inclined "Z" shape; the disassembled valve seat is provided with a sealing surface in the shape of an inner cone, and the sealing surface and The front end of the self-repairing double-seal valve core is matched with the sealing surface of the outer cone shape, and the detachable valve seat is installed inside the valve body; the comb cover is installed outside the self-repairing double-seal valve core; the winding pad The sheet is installed between the bonnet and the valve body, and the bonnet is installed on the valve body; the sealing ring and the sealing gasket are set in the bonnet and wrap the valve stem; the bracket is installed on the bonnet; the valve The rod nut is fixed on the upper end of the bracket and connected with the valve rod by threads; the hand wheel is arranged at the top of the replaceable double-core globe valve and connected with the valve rod. 2. The replaceable double-core stop valve according to claim 1, wherein a spring is arranged inside the self-repairing double-seal valve core.