CN-224214731-U - High-pressure wedge type flat gate valve

Abstract

The utility model discloses a high-pressure wedge type flat gate valve, which relates to the field of flat gate valves, wherein the conventional flat gate valve is incapable of adapting to bidirectional pressure in a one-way manner, a sealing pair is easy to wear, a self-compensation mechanism is lacked, and leakage risks exist. The utility model comprises a valve body, a valve seat, a double parallel valve plate, a valve rod and a valve cover, wherein the double parallel valve plate is matched with the wedge angle inclined planes of a left wedge block and a right wedge block, the wedge is realized by horizontal displacement under the drive of the valve rod, a bidirectional multistage sealing pair is formed, the sealing surfaces of the valve seat and the double parallel valve plate are respectively overlaid with STL alloy, the hardness difference exists between the sealing surfaces of the valve seat and the double parallel valve plate, and the matching inclined planes of the left wedge block and the right wedge block are overlaid with the STL alloy layer. The valve can effectively improve the sealing performance, compensate the abrasion of the sealing surface, prolong the service life, be suitable for high-pressure working conditions and obviously reduce the leakage risk and the operation and maintenance cost of the system.

Inventors

• Ding Xiangbei
• XIONG HAILONG
• HUANG YAN
• HU JINCHEN

Assignees

• 东辰智能科技有限公司

Dates

Publication Date

20260508

Application Date

20250523

Claims (10)

1. 1. The high-pressure wedge type flat gate valve comprises a valve body, a valve seat, double parallel valve plates, valve rods and valve covers, wherein the valve seats are distributed in valve bodies at two sides of the double parallel valve plates in a mirror symmetry mode, the valve covers are arranged at the upper end of the valve body, the valve rods penetrate through the valve covers from top to bottom to enter an inner cavity of the valve body, the high-pressure wedge type flat gate valve is characterized in that the double parallel valve plates comprise left valve plates and right valve plates, left wedge blocks are arranged on the right sides of the left valve plates, right wedge blocks are arranged on the left sides of the right valve plates, the upper ends of the left wedge blocks are connected with the valve rods, the left wedge blocks and the right wedge blocks are matched through wedge angle inclined planes, horizontal displacement is generated under the driving of the valve rods to prop open or relax the double parallel valve plates, and sealing surfaces of the valve seats and the double parallel valve plates are respectively overlaid with STL alloy layers, and hardness differences exist between the left wedge plates and the right wedge plates.
2. 2. The high-pressure wedge type flat gate valve of claim 1, wherein the matched inclined surfaces of the left wedge block and the right wedge block are all overlaid with an STL alloy layer.
3. 3. A high pressure wedge flat gate valve as set forth in claim 2 wherein said STL alloy layer is in the range of 2-4mm thick.
4. 4. The high-pressure wedge type flat gate valve of claim 2, wherein the right wedge is provided with a rectangular hole penetrating from left to right in the middle, STL alloy layers of the right wedge are arranged on inclined planes on the front side and the rear side of the rectangular hole of the right wedge, and the STL alloy layer on the left wedge is positioned corresponding to the STL alloy layer of the right wedge.
5. 5. The high-pressure wedge type flat gate valve of claim 4, wherein a wedge angle matching inclined plane with a vertical included angle ranging from 15 degrees to 20 degrees is arranged between the left wedge block and the right wedge block.
6. 6. The high-pressure wedge type flat gate valve of claim 5, wherein the left side and the right side of the upper part of the left wedge block are respectively connected and fixed with a guide plate through a fastener, and when the left wedge block moves downwards, the lower part of the guide plate stretches into the annular groove of the double parallel valve plate to serve as the guide positioning of the left wedge block and the double parallel valve plate.
7. 7. The high-pressure wedge type flat gate valve of claim 6, wherein a valve cover cylinder is welded on the valve cover, an upper valve cover flange is welded at the upper end of the valve cover cylinder, a plurality of valve cover rib plates which are uniformly distributed around are welded at the periphery of the valve cover cylinder, the lower ends of the valve cover rib plates are welded with the valve cover, and the upper ends of the valve cover rib plates are welded with the upper valve cover flange.
8. 8. The high-pressure wedge type flat gate valve of claim 7, wherein a stuffing box is arranged on the upper flange of the valve cover, a corrugated pipe is sleeved in the middle of the valve rod, and the corrugated pipe and a stuffing sealing structure in the stuffing box form a double sealing structure.
9. 9. The high-pressure wedge type flat gate valve of claim 8, wherein the upper end of the valve rod is connected with a pneumatic actuator, the lower end of the valve rod is connected with a left wedge block, the pneumatic actuator is fixed through a rigid frame formed by welding a bracket lower plate blank, a bracket cylinder body and a bracket upper plate blank, and the bracket cylinder body is provided with a maintenance window.
10. 10. The high-pressure wedge type flat gate valve of claim 9, wherein metal winding gasket seals are arranged between the valve cover and the valve body and at the connection part of the upper flange of the valve cover and the stuffing box.

Description

High-pressure wedge type flat gate valve Technical Field The utility model relates to the field of flat gate valves, in particular to a high-pressure wedge type flat gate valve. Background In the high-pressure and high-temperature working conditions such as petroleum, chemical industry, energy sources and the like, the flat gate valve is used as key control equipment of a medium conveying system, and the sealing reliability and the running stability of the flat gate valve are very important. The traditional flat gate valve generally adopts a unidirectional rigid sealing structure, unidirectional sealing cannot adapt to a bidirectional pressure environment, a sealing pair is easy to wear due to frequent opening and closing, medium flushing and high-temperature deformation, so that a sealing gap is increased, the leakage risk is increased, a self-compensation mechanism for wear is lacked, and the sealing failure probability is obviously increased after long-term operation. Disclosure of utility model The utility model aims to solve the technical problems and the technical task of improving and improving the prior art scheme, and provides a high-pressure wedge type flat gate valve for improving the sealing performance. For this purpose, the present utility model adopts the following technical scheme. The utility model provides a high-pressure wedge type flat gate valve, includes valve body, disk seat, double parallel valve plate, valve rod and valve gap, disk seat mirror symmetry distribute in the both sides valve body of double parallel valve plate, the valve gap locate the valve body upper end, the valve rod pass the valve gap from last down, get into the valve body inner chamber, double parallel valve plate include left valve plate and right valve plate, left valve plate right side establish left voussoir, right valve plate left side establish right voussoir, left voussoir upper end connect the valve rod, left voussoir and right voussoir pass through wedge angle inclined plane cooperation, produce horizontal displacement under the valve rod drive in order to strut or relax double parallel valve plate, disk seat and double parallel valve plate sealed face build-up welding STL alloy layer respectively, and both have hardness difference. Through the STL alloy of different hardness in sealed face both sides build-up welding, can reduce the interlock wearing and tearing, reduce coefficient of friction, promote and open and close smooth degree, double parallel valve plate realizes the wedging through voussoir link gear, forms two-way multistage sealed pair, through horizontal displacement compensation sealed face wearing and tearing, extension valve life effectively promotes sealing performance. STL Alloys, namely Stellite Alloys (Stellite Alloys). As the preferable technical means, the matched inclined surfaces of the left wedge block and the right wedge block are all overlaid with an STL alloy layer. The STL alloy with the slope surface welding can bear friction generated by frequent relative sliding, reduces wedge abrasion, ensures stable wedging force, has high-temperature oxidation resistance, is suitable for high-temperature working conditions, and avoids wedge clamping caused by thermal expansion. As a preferable technical means, the STL alloy layer is in a thickness range of 2-4 mm. The thickness range is optimized, so that on one hand, enough wear-resisting service life is ensured, on the other hand, the risk of cracking of the surfacing layer can be avoided, and meanwhile, the manufacturing cost is controlled. The right wedge block is provided with a rectangular hole penetrating left and right in the middle, the STL alloy layers of the right wedge block are arranged on inclined planes on the front side and the rear side of the rectangular hole of the right wedge block, and the STL alloy layer on the left wedge block corresponds to the STL alloy layer on the right wedge block. Only the alloy is deposited on the key friction surface, so that the material waste is reduced, and the manufacturing cost is reduced. The preferable technical means is that a wedge angle matching inclined plane with a vertical included angle ranging from 15 degrees to 20 degrees is arranged between the left wedge block and the right wedge block. The angle range is larger than the friction self-locking critical angle, so that smooth movement of the wedge block in the opening and closing process of the valve is ensured, and meanwhile, the axial force of the valve rod is efficiently converted into the valve plate sealing force. The left side and the right side of the upper part of the left wedge block are respectively connected and fixed with a guide plate through a fastener, and when the left wedge block moves downwards, the lower part of the guide plate stretches into the annular groove of the double parallel valve plate to serve as the guide positioning of the left wedge block and the double parallel valve plate. And the left wedg