CN-115839418-B - Double-seal double-discharge triple-eccentric metal hard seal butterfly valve

CN115839418BCN 115839418 BCN115839418 BCN 115839418BCN-115839418-B

Abstract

A double-seal double-discharge triple-eccentric metal hard seal butterfly valve is characterized in that a double-seal ring structure is arranged between a butterfly plate and a valve seat, a ring groove structure is formed between the double-seal ring structure and the valve seat, so that when a medium passes through a medium high-pressure first seal ring, if part of leakage medium passes through the first seal ring and enters the ring groove, the medium pressure of the ring groove is smaller than the pressure of the medium in a valve cavity, when the pressure of the medium in the ring groove is too low, the medium with low pressure cannot pass through a second seal ring and enter a rightmost valve cavity, and the discharge purging device can be connected with a purging device to purge and clean the seal ring, and can also be connected with a grease injection device to inject grease into the ring groove by a grease injection gun to realize emergency sealing.

Inventors

ZHOU JUN
SHAO LITING
ZHENG XIAOJING
WANG HONGJIAN
HUANG HUI
SHAO CHUN
SUN HEFENG
LV XIN

Assignees

浙江北泽阀门科技有限公司

Dates

Publication Date: 20260505
Application Date: 20210918

Claims (6)

1. A double-seal double-discharge triple-eccentric metal hard seal butterfly valve comprises a valve body and a valve shaft and is characterized in that a valve cavity is formed in the valve body, a valve seat and a butterfly plate are arranged in the valve cavity, one end of the valve shaft extends into the valve cavity and is connected with the butterfly plate, the butterfly plate is provided with a butterfly plate sealing surface, the valve seat is provided with a valve seat sealing surface, a double-seal ring structure is arranged between the butterfly plate sealing surface and the valve seat sealing surface, two ends of the double-seal ring structure are correspondingly propped against the butterfly plate and the valve seat, a double-discharge blowing device is arranged on the valve body, a blowing channel is arranged on the valve body, one end of the double-discharge blowing device extends into the blowing channel and is connected with the valve body, a connecting channel is arranged on the valve seat, one end of the blowing channel away from the double-discharge blowing device is communicated with the connecting channel of the valve seat, the double-discharge blowing device is used for blowing and sealing the valve seat, the double-discharge blowing device comprises a first blowing piece and a second blowing piece, the first channel and the second blowing piece are arranged corresponding to the first channel and the second channel, the bottom of the second channel and the valve seat and the second channel are arranged towards the valve seat and the curved groove are communicated with the valve cavity, and the curved groove is formed, and the blowing channel and the curved groove is communicated with the other end is formed, and the blowing channel is communicated with the valve groove.
2. The double-seal double-discharge triple-eccentric metal hard seal butterfly valve of claim 1, wherein the double-seal ring structure comprises a first seal ring and a second seal ring, the butterfly plate seal surface is arranged in a stepped manner, the butterfly plate seal surface is provided with a first stepped surface and a second stepped surface, the first seal ring is arranged on the first stepped surface, the second seal ring is arranged on the second stepped surface, the first seal ring and the second seal ring are correspondingly provided with a first seal end and a second seal end, the first seal end and the second seal end are propped against a valve seat seal surface of a valve seat, a ring groove grinding-bearing seal structure is formed among the first seal end, the second seal end and the valve seat, a ring groove is formed among the valve seat seal surface, the first seal ring and the second seal ring, and the ring groove is communicated with a connecting channel.
3. The double-seal double-discharge triple-eccentric metal hard seal butterfly valve of claim 2, wherein the second seal ring is arranged on one side of the first seal ring far away from the first step surface, the second seal ring is fixed on the second step surface through a screw, and one end of the second seal ring is used for compressing and fixing the first seal ring.
4. The dual seal dual drain triple offset metal hard seal butterfly valve of claim 1 wherein the first purge member and the second purge member extend into corresponding first purge passage and second purge passage, the first purge passage communicating with the connecting passage of the valve seat and the second purge passage communicating with the valve cavity.
5. The double-seal double-discharge triple-eccentric metal hard seal butterfly valve of claim 2, wherein the second seal ring is of a pressing ring structure, the second seal ring is a seal pressing ring which is arranged on one side of the first seal ring and presses the first seal ring, and the second seal end is an integrally formed protruding end on the seal pressing ring.
6. The double-seal double-discharge triple-eccentric metal hard seal butterfly valve of claim 1, wherein a detachable structure is arranged between the valve seat and the valve body, a valve seat pressing ring is arranged on one side of the valve seat, a triple-open clamping ring is arranged on one side of the valve seat pressing ring, which is far away from the valve seat, a clamping ring groove is arranged on the valve body, the triple-open clamping ring is arranged in the clamping ring groove, a set screw is arranged on the triple-open clamping ring, and the set screw penetrates through the triple-open clamping ring to press and fix the valve seat pressing ring towards the valve seat.

Description

Double-seal double-discharge triple-eccentric metal hard seal butterfly valve Technical Field The invention relates to the technical field of butterfly valves, in particular to a double-seal double-discharge triple-eccentric metal hard seal butterfly valve. Background In the application process of the industrial butterfly valve, the problems of leakage, corrosion, blockage and the like generally exist. Leakage is typically caused by the presence of foreign objects or wear resulting in failure of the sealing surfaces. Corrosion is caused by the presence of corrosive elements in the transmission medium, and the failure of the valve components to provide effective corrosion protection or wear results in failure of the corrosion barrier. The butterfly valve is generally blocked due to impure medium or medium with adhesiveness, so that impurities are deposited, adhered or blocked on the sealing ring and the valve body seat, and the butterfly plate is not tightly closed, and the sealing leakage or the butterfly plate cannot be normally opened. In practical conditions, slag or rust or particulate impurities in the medium tend to form deposits on the sealing surfaces, and viscous media such as tar tend to form deposits on the valve seat or shaft and bushing, resulting in difficulties or downtime of the valve plate when it is rotated open. In such cases, it is generally necessary to shut down for maintenance, either off-line with the valve removed from the pipeline or by introducing gas or steam from the pipeline for pipeline flushing. If the blockage is severe, steam scouring is not effectively solved. At present, in harsh working conditions, when pipeline media are dust, particles and scrap iron with higher viscosity, gaps are reserved between the valve rod and the bushing of the triple offset butterfly valve, and in the working process, the medium with higher viscosity can adhere to the valve rod and the bushing in the valve body, so that the valve rod and the valve body are bitten when rotating, and the service life of the butterfly valve is reduced. The existing triple eccentric hard seal butterfly valve has the following defects that the existing triple eccentric butterfly valve is not provided with a purging structure or a unidirectional purging structure, as the sealing ring is fixed on the butterfly plate, when the butterfly plate is in a normally open state, the sealing surface of the butterfly plate is flushed, the sealing surface is worn, the sealing failure directly affects the sealing performance, when the butterfly plate is closed, the sealing surface is easily accumulated and blocked due to the valve body seat, and further the sealing is tightly closed, so that the sealing failure is caused, and the service life of the valve is greatly reduced. Disclosure of Invention In view of this, the present invention provides a double seal double bleed triple offset metal hard seal butterfly valve. In order to achieve the above purpose, the present invention provides the following technical solutions: The utility model provides a dual-seal double-discharge triple eccentric metal hard seal butterfly valve, includes valve body and valve shaft, form the valve pocket in the valve body, set up disk seat and butterfly plate in the valve pocket, the one end of valve shaft stretches into the valve pocket and is connected with the butterfly plate, the butterfly plate has the butterfly plate sealed face, the disk seat has the disk seat sealed face, set up double seal ring structure between butterfly plate sealed face and the disk seat sealed face, the both ends of double seal ring structure are corresponding to support butterfly plate and disk seat, set up the double discharge and sweep the device on the valve body, set up the passageway that sweeps on the valve body, the one end that sweeps the device was put to the double discharge stretches into the passageway and is connected with the valve body, set up connecting channel on the disk seat, the one end that sweeps the device was put to the double discharge and sweep the connecting channel intercommunication of disk seat, the double discharge sweeps the device and sweeps sealed through passageway and connecting channel to disk seat, butterfly plate and double seal ring structure in the valve pocket. Preferably, the double-sealing ring structure comprises a first sealing ring and a second sealing ring, the sealing surface of the butterfly plate is arranged in a stepped manner, the sealing surface of the butterfly plate is provided with a first stepped surface and a second stepped surface, the first sealing ring is arranged on the first stepped surface, the second sealing ring is arranged on the second stepped surface, the first sealing ring and the second sealing ring are correspondingly provided with a first sealing end and a second sealing end, the first sealing end and the second sealing end are respectively propped against the sealing surface of the valve seat, a we