CN206338432U - A kind of dual-seal flat gate valve - Google Patents

Abstract

A double-sealed slab gate valve, on the basis of conventional slab gate valve sealing, adds a pre-tightened sealing secondary valve seat to realize double sealing of the valve seat and the gate plate. Under the thrust of the medium, the main valve seat generates a sealing force against the gate to form the first seal, and the secondary valve seat presses to the gate sealing surface under the thrust of the butterfly spring to form the second seal. When the main valve seat suffers medium erosion and corrosion during long-term use and leaks, the secondary valve seat can still play a sealing role to ensure the sealing of the valve.

Description

A double sealing plate gate valve

technical field

The utility model specifically relates to the technical field of valves, in particular to a double-seal flat gate valve.

Background technique

Slab gate valve is a kind of pipeline valve, which is mainly used in long-distance pipelines and tank farms. Its sealing reliability and stability will directly affect the transportation of crude oil and the safety of installations. Therefore, it is very important to improve the sealing performance and service life of the flat gate valve.

The double-seal flat gate valve is developed to solve the problem that the sealing surface of the current flat gate valve is easy to damage and leak and requires frequent maintenance. Conventional slab gate valves are prone to wear and pitting on the sealing surface under the scouring of the medium, resulting in seal failure and leakage, which cannot function as a normal cut-off, and there is a great potential safety hazard.

Contents of the invention

In order to solve the deficiencies of the prior art, the utility model provides a high-performance gate valve.

The technical solution adopted by the utility model is: a double-sealed flat gate valve, including a valve body, a valve stem and an operating mechanism. The valve body is provided with a valve cover, and the valve body is also provided with a valve seat. The front end of the valve stem is provided with a gate, the middle of the valve body is provided with a flow channel, the upper and lower sides of the flow channel are respectively provided with an upper cavity and a lower cavity, and the valve seat includes a main valve seat. The main valve seat and the gate plate are tightly matched, and the bottom of the main valve seat is also provided with a secondary valve seat, and the secondary valve seat is located between the gate plate and the valve body, and the secondary valve seat and the valve body Elastic parts are also arranged between the bodies, and the said secondary valve seat is in sealing fit with the gate plate.

The elastic member between the secondary valve seat and the valve body is a butterfly spring, and an installation groove is formed between the secondary valve seat, the main valve seat and the valve body, and the butterfly spring is located in the installation groove.

The bottom of the main valve seat is provided with a groove, and the secondary valve seat is provided with a boss matching the groove, and the boss and the groove are clamped and fitted.

The bottom of the secondary valve seat is also provided with a limit block, and the butterfly spring is limitedly matched with the limit block.

The front end of the valve stem is also provided with a valve stem head, and the gate plate is installed on the valve stem head.

The contact surfaces of the main valve seat, the secondary valve seat and the gate plate are respectively provided with a first sealing member.

A second seal is provided between the main valve seat and the secondary valve seat.

The beneficial effects of the utility model are: the utility model provides a double-seal flat gate valve, which adds a pre-tightened sealing secondary valve seat on the basis of the conventional flat gate valve sealing, so as to realize double sealing of the valve seat and the gate plate. Under the thrust of the medium, the main valve seat generates a sealing force against the gate to form the first seal, and the secondary valve seat presses to the gate sealing surface under the thrust of the butterfly spring to form the second seal. When the main valve seat suffers medium erosion and corrosion during long-term use and leaks, the secondary valve seat can still play a sealing role to ensure the sealing of the valve.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a schematic diagram of the structure of the valve seat of the present invention.

In the figure 1-valve body, 2-valve stem, 3-gate, 4-main valve seat, 5-secondary valve seat, 6-elastic part, 7-valve stem head, 8-first seal, 9-the first Two seals, 11-bonnet, 12-flow channel, 13-upper cavity, 14-lower cavity, 41-groove, 51-installation groove, 52-boss, 53-limiting block.

detailed description

The utility model is further described in conjunction with Fig. 1 and Fig. 2. A double-seal flat gate valve includes a valve body 1, a valve stem 2 and an operating mechanism. The valve body 1 is provided with a bonnet 11, and the valve body 1 The body 1 is also provided with a valve seat, the front end of the valve stem 2 is provided with a gate 3, and the front end of the valve stem 2 is also provided with a valve stem head 7, and the gate 3 is installed on the valve stem head 7. superior. The middle of the valve body 1 is provided with a flow channel 12, and the upper and lower sides of the flow channel 12 are respectively provided with an upper cavity 13 and a lower cavity 14. The valve seat includes a main valve seat 4, and the main valve seat 4 is The valve seat 4 is tightly matched with the gate plate 3, and the bottom of the main valve seat 4 is also provided with a secondary valve seat 5, and the secondary valve seat 5 is located between the gate plate 3 and the valve body 1, and the secondary valve seat 5 is located between the gate plate 3 and the valve body 1. An elastic member 6 is also provided between the seat 5 and the valve body 1, and the said secondary valve seat 5 and the gate plate 3 are sealed and fitted. The elastic member 6 between the secondary valve seat 5 and the valve body 1 is a disc spring, and a mounting groove 51 is formed between the secondary valve seat 5, the main valve seat 4 and the valve body 1, and the disc spring is located at the installation position. Inside the groove 51. The bottom of the main valve seat 4 is provided with a groove 41 , and the secondary valve seat 5 is provided with a boss 52 matching the groove 41 , and the boss 52 and the groove 41 are clamped and fitted. The bottom of the secondary valve seat 5 is also provided with a limiting block 53 , and the butterfly spring cooperates with the limiting block 53 in a limited position.

The utility model realizes double sealing of the valve seat and the gate plate by adding a pre-tightened sealing secondary valve seat on the basis of the sealing of the conventional flat gate valve. Under the thrust of the medium, the main valve seat generates a sealing force against the gate to form the first seal. The pre-tightened secondary valve seat is pressed to the gate sealing surface under the thrust of the butterfly spring to form a second seal. When the main valve seat suffers medium erosion and corrosion during long-term use and leaks, the secondary valve seat can still play a sealing role to ensure the sealing of the valve.

First seals 8 are also provided on the contact surfaces of the main valve seat 4 and the secondary valve seat 5 and the gate plate 3 respectively. A second seal 9 is provided between the main valve seat 4 and the secondary valve seat 5 .

The above descriptions are only preferred implementations of the present utility model, and the protection scope of the present utility model is not limited to the above-mentioned embodiments, and all technical solutions under the idea of the present utility model all belong to the protection scope of the present utility model. It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principle of the utility model should also be regarded as the protection scope of the utility model.

Claims (7)

1. a kind of dual-seal flat gate valve, including valve body（1）, valve rod（2）And operating mechanism, described valve body（1）On set There is bonnet（11）, described valve body（1）Inside it is additionally provided with valve seat, described valve rod（2）Front end is provided with flashboard（3）, it is characterised in that Described valve body（1）Centre is provided with runner（12）, described runner（12）Upper and lower is respectively equipped with upper cavity（13）And lower chamber （14）, described valve seat includes main valve seat（4）, described main valve seat（4）With flashboard（3）Between seal coordinate, described main valve seat （4）Bottom is additionally provided with time valve seat（5）, described secondary valve seat（5）Positioned at flashboard（3）With valve body（1）Between, described secondary valve seat （5）With valve body（1）Between be additionally provided with elastic component（6）, described secondary valve seat（5）With flashboard（3）Between seal coordinate.

2. a kind of dual-seal flat gate valve according to claim 1, it is characterised in that described secondary valve seat（5）With valve Body（1）Between elastic component（6）For butterfly spring, described secondary valve seat（5）With main valve seat（4）And valve body（1）Between be formed with mounting groove （51）, described butterfly spring is positioned at mounting groove（51）It is interior.

3. a kind of dual-seal flat gate valve according to claim 1, it is characterised in that described main valve seat（4）Bottom Provided with groove（41）, described secondary valve seat（5）It is provided with and groove（41）The boss of adaptation（52）, described boss（52）With it is recessed Groove（41）Between be engaged by clamping.

4. a kind of dual-seal flat gate valve according to claim 2, it is characterised in that described secondary valve seat（5）Bottom It is additionally provided with limited block（53）, described butterfly spring and limited block（53）It is spacing to coordinate.

5. a kind of dual-seal flat gate valve according to claim 1, it is characterised in that described valve rod（2）Front end It is additionally provided with stem head（7）, described flashboard（3）Installed in stem head（7）On.

6. a kind of dual-seal flat gate valve according to claim 1, it is characterised in that described main valve seat（4）With it is secondary Valve seat（5）With flashboard（3）Contact surface on be additionally provided with first seal respectively（8）.

7. a kind of dual-seal flat gate valve according to claim 1, it is characterised in that described main valve seat（4）With it is secondary Valve seat（5）Between be provided with second seal（9）.