CN109027274B

CN109027274B - Bimetal seal elastic anti-scouring structure and stop valve thereof

Info

Publication number: CN109027274B
Application number: CN201710425618.6A
Authority: CN
Inventors: 祁崇可; 汝强; 默静轶; 潘正邦; 王锐
Original assignee: CNNC Sufa Technology Industry Co Ltd
Current assignee: CNNC Sufa Technology Industry Co Ltd
Priority date: 2017-06-08
Filing date: 2017-06-08
Publication date: 2020-03-17
Anticipated expiration: 2037-06-08
Also published as: CN109027274A

Abstract

The application belongs to the valve field, concretely relates to bimetal seal elasticity antiscour structure and stop valve thereof. A bimetal seal elastic anti-scouring structure comprises a main valve seat, a main valve flap, a compression nut and a valve rod, wherein the compression nut is located at the lowest part, the hollow position of the compression nut is matched with the main valve flap, the valve rod is arranged in the main valve flap, the main valve seat is arranged outside the main valve flap, and an auxiliary valve flap with the extending length being more than or equal to the length of the main valve flap is arranged on the periphery of the main valve flap. The application has the following effects: the application utilizes the addition of a front-mounted elastic metal seal pair to limit the medium flow rate and guide the flushing part to the auxiliary seal to protect the main seal of the valve clack. The outer sides of the main valve flap and the valve seat are additionally provided with throttling elastic auxiliary sealing pairs (an auxiliary valve flap and an auxiliary valve seat), and the auxiliary sealing can be detached and replaced, so that the structure is simple and reliable, and the disassembly and maintenance are facilitated.

Description

Bimetal seal elastic anti-scouring structure and stop valve thereof

Technical Field

The application belongs to the valve field, concretely relates to bimetal seal elasticity antiscour structure and stop valve thereof.

Background

The technology of the stop valve is mature and is one of the most mainstream cut-off valve products in the market at present. Shut-off valve trim typically includes: valve seat, valve clack and valve rod. The stop valve drives the valve clack to move through the valve rod, and the stop valve and the sealing surface of the valve seat are opened and closed to realize the control of the cutting off or the circulation of the medium.

Under certain working conditions of liquid or gas medium with high pressure difference and high flow rate, the valve clack and the valve seat of the stop valve are sealed in the closing or just opening process, the flow rate of the medium is increased at the throttling part and directly passes through the sealing surfaces of the valve clack and the valve seat, so that the valve clack and the valve seat are corroded, and the service life of the stop valve under the working conditions is generally short.

Disclosure of Invention

This application provides a bimetal seal elasticity antiscour structure and stop valve to among the prior art, under high pressure difference, high velocity of flow liquid or gaseous medium operating mode, the valve clack is anti often to be erodeed and is leaded to the short defect of life-span.

The invention content is as follows: a stop valve comprises a valve seat, a valve clack and a valve rod, wherein the tail end of the valve clack adopts an anti-scouring structure.

A bimetal seal elastic anti-scouring structure comprises a main valve seat, a main valve flap, a compression nut and a valve rod, wherein the compression nut is located at the lowest part, the hollow position of the compression nut is matched with the main valve flap, the valve rod is arranged in the main valve flap, the main valve seat is arranged outside the main valve flap, and an auxiliary valve flap with the extending length being more than or equal to the length of the main valve flap is arranged on the periphery of the main valve flap.

According to the bimetal sealing elastic anti-scouring structure, the periphery of the compression nut is provided with the groove, the auxiliary valve seat and the elastic part are arranged in the groove, and the position of the auxiliary valve seat is matched with the position of the auxiliary valve clack.

The bimetal seal elastic anti-scouring structure is characterized in that the elastic part is a spring or a disc spring.

The application has the following effects: the application utilizes the addition of a front-mounted elastic metal seal pair to limit the medium flow rate and guide the flushing part to the auxiliary seal to protect the main seal of the valve clack. The outer sides of the main valve flap and the valve seat are additionally provided with throttling elastic auxiliary sealing pairs (an auxiliary valve flap and an auxiliary valve seat), and the auxiliary sealing can be detached and replaced, so that the structure is simple and reliable, and the disassembly and maintenance are facilitated.

Drawings

FIG. 1 is a schematic diagram of a shut-off valve with the anti-flush structure of the present application;

FIG. 2 is an enlarged fragmentary view of the anti-flush structure of FIG. 1 shown closed;

FIG. 3 is an enlarged fragmentary view of the anti-flush structure of FIG. 1 showing the secondary valving flap in a throttled position;

fig. 4 is an enlarged partial view of the open anti-flush structure of fig. 1.

In the figure: 1. a main valve seat; 2. a main valve flap; 3. a compression nut; 4. a valve stem; 5. an auxiliary valve flap; 6. a secondary valve seat; 7. an elastic member.

Detailed Description

As shown in figure 1, the stop valve comprises a valve seat, a valve clack and a valve rod, wherein the tail end of the valve clack adopts an anti-scouring structure.

As shown in the attached figures 2-4, the bimetal seal elastic anti-scouring structure comprises a main valve seat 1, a main valve flap 2, a compression nut 3 and a valve rod 4, wherein the compression nut 3 is located at the lowest part, the hollow position of the compression nut 3 is matched with the main valve flap 2, the valve rod 4 is arranged in the main valve flap 2, the main valve seat 1 is arranged outside the main valve flap 2, and an auxiliary valve flap 5 with the extending length being more than or equal to the length of the main valve flap 2 is arranged on the periphery of the main valve flap 2.

According to the bimetal sealing elastic anti-scouring structure, the periphery of the compression nut 3 is provided with a groove, an auxiliary valve seat 6 and an elastic part 7 are arranged in the groove, and the position of the auxiliary valve seat 6 is matched with the position of the auxiliary valve flap 5.

In the bimetal sealing elastic anti-scouring structure, the elastic part 7 can be a spring or a disc spring.

For the condition of medium low in and high out, in the closing process, namely the process of cutting fluid, the valve rod (piece 4) drives the main valve flap and the auxiliary valve flap to move downwards from the opening position to be close to the valve seat, firstly, the auxiliary valve flap and the auxiliary valve seat are in contact throttling, at the moment, fluid erosion mainly occurs at the auxiliary valve flap and the valve seat, the main valve seat and the valve flap still keep a larger channel, and the medium flow rate is slower. When closing is continued, the secondary flap contacts the secondary valve seat and presses against the spring below to generate a certain specific sealing pressure, and since the pressure is not forced to seal, a small amount of leakage exists, but most of the fluid is intercepted at this time. Thus, the flow rate of fluid between the main valve seat and the main valve flap is greatly reduced and tends to come to rest. When the valve rod continues to drive the valve clack to move downwards to make the main valve clack contact with the main valve seat and generate designed sealing specific pressure, the main valve clack and the main valve seat realize forced sealing. In the opening process, the valve rod moves upwards to drive the valve clack to separate the main valve seat and the main valve clack, the compressed spring still supports the auxiliary valve seat to the auxiliary valve clack to form throttling, and the main valve clack and the valve seat are protected from erosion of fluid.

This construction takes into account both the life and the replaceability of the secondary valve seat and the secondary valve flap. The auxiliary valve seat and the auxiliary valve clack generate pretightening force through the spring, and the auxiliary valve clack and the auxiliary valve seat mainly work as throttling and set enough allowance of spring stroke, so that the auxiliary valve clack can still work under the condition of certain abrasion or erosion. When the spring exceeds a preset amount, the auxiliary valve clack and the auxiliary valve seat can be replaced.

Claims

1. The utility model provides a bimetal seal elasticity antiscour structure, includes main valve seat (1), main valve lamella (2), gland nut (3), valve rod (4), and wherein main valve seat (1) is located the below, and at gland nut (3) hollow position and main valve lamella (2) phase-match, set up valve rod (4) in main valve lamella (2), main valve lamella (2) are equipped with main valve seat (1) outward, its characterized in that: an auxiliary valve flap (5) with the extension length more than or equal to the length of the main valve flap (2) is arranged at the periphery of the main valve flap (2);

the bimetal sealing elastic anti-scouring structure is characterized in that a groove is formed in the periphery of a main valve seat (1), an auxiliary valve seat (6) and an elastic part (7) are arranged in the groove, and the position of the auxiliary valve seat (6) is matched with the position of an auxiliary valve clack (5).

2. The bimetallic seal elastomeric erosion resistant structure of claim 1, wherein: the elastic part (7) is a spring.

3. The bimetallic seal elastomeric erosion resistant structure of claim 1, wherein: the elastic part (7) is a disc spring.

4. The bimetallic seal elastomeric erosion resistant structure of claim 1, wherein: the periphery of the main valve seat (1) is provided with discontinuous grooves, an auxiliary valve seat (6) and an elastic part (7) are arranged in the grooves, and the position of the auxiliary valve seat (6) is matched with the position of the auxiliary valve clack (5).

5. The bimetallic seal elastomeric anti-scour structure of claim 4, further comprising: the elastic part (7) is a spring.

6. The bimetallic seal elastomeric anti-scour structure of claim 4, further comprising: the elastic part (7) is a disc spring.