CN106609873B

CN106609873B - Elastic hard sealing balanced valve core

Info

Publication number: CN106609873B
Application number: CN201510688364.8A
Authority: CN
Inventors: 陈刚; 杨雪华; 徐兴华; 干瑞斌; 龚宝龙
Original assignee: CNNC Sufa Technology Industry Co Ltd
Current assignee: CNNC Sufa Technology Industry Co Ltd
Priority date: 2015-10-22
Filing date: 2015-10-22
Publication date: 2020-01-07
Anticipated expiration: 2035-10-22
Also published as: CN106609873A

Abstract

The invention belongs to a valve core, and particularly relates to an elastic hard seal balanced type valve core. The valve comprises an upper part and a lower part, wherein the upper part comprises an outer sleeve and an upper valve seat, the inner wall of the lowermost end of the outer sleeve is provided with a central annular bulge, the upper valve seat is buckled on the annular bulge of the outer sleeve, a disc spring, a pressure ring and a graphite sealing ring are arranged in an annular space formed by the upper valve seat and the outer sleeve, a pressing sleeve is arranged at a position above the valve seat on the inner side wall of the outer sleeve and fixedly connected with the outer sleeve, the lower part comprises a throttling sleeve and a valve seat, a valve clack is arranged in the throttling sleeve, and a. The invention has the following advantages: the invention discloses an elastic hard sealing balanced type valve core structure, which is a novel sealing structure for a balanced type double-sealing surface sleeve type regulating valve. The design of the valve sleeve structure enables the valve to simultaneously meet the combined action working conditions of various complex requirements such as large caliber, high temperature, high pressure difference, high solid content and the like, and meanwhile, the lower leakage rate can be realized.

Description

Elastic hard sealing balanced valve core

Technical Field

The invention belongs to a valve core, and particularly relates to an elastic hard seal balanced type valve core.

Background

Sleeve type regulating valves have matured considerably over the years and are one of the mainstream regulating valve products on the market today. The sleeve type regulating valve has the main advantages that: the guiding is reliable and the stability is good; the inner part is connected without screw thread, so the maintenance is convenient; the requirements of a plurality of structures for adapting to different working conditions can be changed.

Sleeve valves generally have three configurations in which internal pressure acts: the valve cage is guided to the single-seat sleeve valve and the balanced single-seat sleeve valve; balanced type double-sealing surface sleeve valve. Their main differences are the number of seats, respectively: a single valve seat; adding a sliding seal for the single valve seat; a double valve seat.

In the valve cage guide single-seat sleeve valve, the sleeve only serves as a guide and a pressing valve seat, and can be regarded as an improved variety of a common single seat. It is used in small caliber and low pressure difference as single seat valve.

The balanced single-seat sleeve valve is used in common working condition and consists of one main valve seat seal and one sliding seal in the upper part. It has the same advantages as a single seat valve: the pressure balance valve has the characteristics of easy manufacture, convenient maintenance and pressure balance, and can be used for the conditions of large caliber and high pressure difference. However, the sliding seal at the upper part also brings great influence on the reliability of the valve, and the repeated movement and abrasion of the sliding seal ring cannot be avoided, so that the service life is limited. Meanwhile, the balance ring is sensitive to the cleanliness of the medium and is not suitable for the working condition containing solid particles.

The balanced double-sealing-surface sleeve valve has the advantages of simple and reliable structure, soft sealing in a common structure and better performance of the whole machine. However, if the double-channel hard seal is made to cope with complex severe working conditions including large caliber, high temperature, high pressure and high pressure difference, the processing and manufacturing requirements are quite high. The reason is that the double sealing surfaces of the valve core and the valve seat are in rigid states, and the complete fitting difficulty is high. The sealing is difficult, and the leakage amount is a disadvantage inherent in the sealing.

Disclosure of Invention

The invention aims to provide an elastic hard seal balanced type valve core aiming at the defects of the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme: an elastic hard sealing balanced type valve core comprises an upper part and a lower part, wherein the upper part comprises an outer sleeve and an upper valve seat, the inner wall of the lowermost end of the outer sleeve is provided with an annular bulge towards the center, the upper valve seat is a part with an L-shaped section, the upper valve seat is buckled on the annular bulge of the outer sleeve, a disc spring, a pressing ring and a graphite sealing ring are arranged in an annular space formed by the upper valve seat and the outer sleeve, the disc spring and the pressing ring form elasticity, the graphite sealing ring is used for sealing, a pressing sleeve is arranged at a position above the valve seat on the inner side wall of the outer sleeve, the pressing sleeve is fixedly connected with the outer sleeve,

the lower part comprises a throttling sleeve and a valve seat, wherein the valve seat is arranged at the lowest part, the throttling sleeve is a cylindrical part, the diameter of the throttling sleeve is matched with that of the outer sleeve, the connecting surface of the throttling sleeve and the outer sleeve is also matched, the throttling sleeve and the outer sleeve can be tightly connected,

a valve clack is arranged in the throttling sleeve, and a valve rod is arranged in the center of the valve clack.

The elastic hard seal balanced type valve core is characterized in that the outer sleeve is fixedly connected with the compression sleeve through a compression screw.

The elastic hard seal balanced type valve core is characterized in that the width of the compression sleeve is smaller than that of the upper valve seat, and the upper valve seat and the valve clack are provided with chamfers matched with each other.

The elastic hard seal balanced type valve core is characterized in that the disc spring is provided with a first end and a second end, and the first end is connected with the valve actuating mechanism.

The invention has the following advantages: the invention discloses an elastic hard sealing balanced type valve core structure, which is a novel sealing structure for a balanced type double-sealing surface sleeve type regulating valve. The design of the valve sleeve structure enables the valve to simultaneously meet the combined action working conditions of various complex requirements such as large caliber, high temperature, high pressure difference, high solid content and the like, and meanwhile, the lower leakage rate can be realized. The leakage grade can be improved to be above grade IV from the original grade III leakage rate specified by GB/T4213-2008.

Drawings

FIG. 1 is a schematic structural diagram of an elastic hard seal balanced type valve core;

FIG. 2 is a schematic diagram of installation of an elastic hard seal balanced type valve core structure regulating valve.

In the figure: 1. valve seat, 2 throttling sleeve, 3 valve clack, 4 outer sleeve, 5 disc spring, 6 pressing ring, 7 graphite sealing ring, 8 upper valve seat, 9 pressing sleeve, 10 valve rod, 11 pressing screw, 12 valve body, 16 valve cover, 17 middle flange bolt

Detailed Description

As shown in the attached figure 1, the elastic hard sealing balanced type valve core comprises an upper part and a lower part, wherein the upper part comprises an outer sleeve 4 and an upper valve seat 8, the inner wall of the lowest end of the outer sleeve 4 is provided with an annular bulge towards the center, the upper valve seat 8 is a part with an L-shaped section, the upper valve seat 8 is buckled on the annular bulge of the outer sleeve 4, a disc spring 5, a pressing ring 6 and a graphite sealing ring 7 are arranged in an annular space formed by the upper valve seat 8 and the outer sleeve 4, the disc spring 5 and the pressing ring 6 form elasticity, the graphite sealing ring 7 is used for sealing, a pressing sleeve 9 is arranged at a position above the valve seat 8 on the inner side wall of the outer sleeve 4, and the,

the lower part comprises a throttling sleeve 2 and a valve seat 1, wherein the valve seat 1 is arranged at the lowest part, the throttling sleeve 2 is a cylindrical part, the diameter of the throttling sleeve is matched with that of an outer sleeve 4, the connecting surfaces of the throttling sleeve 2 and the outer sleeve 4 are also matched to ensure that the throttling sleeve 2 and the outer sleeve 4 can be tightly connected,

a valve clack 3 is arranged in the throttling sleeve 2, and a valve rod 10 is arranged in the center of the valve clack 3.

The compression sleeve 9 is fixedly connected with the outer sleeve 4 through a compression screw 11.

The width of the compression sleeve 9 is smaller than that of the upper valve seat 8, and the upper valve seat 8 and the valve clack 3 are provided with chamfers matched with each other.

The pretightening force of the disc spring 5 is half of the maximum driving force provided by the valve actuating mechanism.

As shown in fig. 2, the installation structure of the valve core of the present application is roughly: the valve core is installed in the reservation intracavity of valve body 12, and the disk seat 1 of valve core sets up at the lower extreme, sets up valve gap 16 at the top of valve body 12, and valve gap 16 passes through middle flange bolt 17 and valve body 12 fixed connection, and valve rod 10 stretches out the valve gap 16 outside.

Claims

1. The utility model provides an elasticity seals balanced type case firmly which characterized in that: comprises an upper part and a lower part, the upper part comprises an outer sleeve (4) and an upper valve seat (8), the inner wall of the lowest end of the outer sleeve (4) is provided with an annular bulge towards the center, the upper valve seat (8) is a part with an L-shaped section, the upper valve seat (8) is buckled on the annular bulge of the outer sleeve (4), a disc spring (5), a pressing ring (6) and a graphite sealing ring (7) are arranged in an annular space formed by the upper valve seat (8) and the outer sleeve (4), wherein the disc spring (5) and the pressing ring (6) form elasticity, the graphite sealing ring (7) is used for sealing, a pressing sleeve (9) is arranged at a position above the valve seat (8) on the inner side wall of the outer sleeve (4), and the pressing sleeve (9) is fixedly connected,

the lower part comprises a throttling sleeve (2) and a valve seat (1), wherein the valve seat (1) is arranged at the lowest part, the throttling sleeve (2) is a cylindrical part, the diameter of the throttling sleeve is matched with that of the outer sleeve (4), the connecting surface of the throttling sleeve (2) and the outer sleeve (4) is also matched, the two can be tightly connected,

a valve clack (3) is arranged in the throttling sleeve (2), and a valve rod (10) is arranged in the center of the valve clack (3);

the compression sleeve (9) is fixedly connected with the outer sleeve (4) through a compression screw (11);

the width of the compression sleeve (9) is smaller than that of the upper valve seat (8), and chamfers matched with each other are arranged on the upper valve seat (8) and the valve clack (3);

the pretightening force of the disc spring (5) is half of the maximum driving force provided by the valve actuating mechanism.