CN211649111U

CN211649111U - Vacuum isolation gate valve

Info

Publication number: CN211649111U
Application number: CN201922428129.3U
Authority: CN
Inventors: 不公告发明人
Original assignee: Tianjin Tangvalve Jinbaili Valve Co ltd
Current assignee: Tianjin Tangvalve Jinbaili Valve Co ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-10-09
Anticipated expiration: 2029-12-30

Abstract

The utility model provides a gate valve is kept apart in vacuum, includes valve body, flashboard, disk seat, valve rod, valve gap, double-screw bolt, support, filler, packing pressure cover, gland, eyelet bolt, valve-stem nut, transmission, its characterized in that, the inside passageway that is provided with of valve body, valve body top fixed seal has the valve gap, valve body central authorities are equipped with the valve rod, the valve rod passes the valve gap and is connected with transmission, the valve rod lower extreme is connected with the flashboard, valve gap and valve body fixed connection, the sealed face of disk seat and the sealed face of flashboard are all built-up welding and are taken care of immediately carbide, and the gland is located the periphery of valve rod, and the packing is adorned in the gland storehouse, and the gland compresses tightly the filler, and gland overlaps upper portion and is equipped with gland, and. The utility model discloses simple structure, maintenance convenience, long service life, and the leakproofness is good, and the sealed face of disk seat and the sealed face of flashboard are all built up welding department too upright carbide, stand wear and tear, resistant erodeing, corrosion-resistant.

Description

Vacuum isolation gate valve

Technical Field

The utility model relates to the technical field of valves, especially, relate to a gate valve is kept apart in vacuum.

Background

China's industry is gradually developing towards intensive, energy-saving, emission-reducing and low-carbon. The high-pressure gate valve, also called stop valve, is the most widely used valve, and is popular because of the small friction force between the sealing surfaces in the opening and closing process, the durability, the small opening height, the easy manufacture, the convenient maintenance, and not only suitable for the middle and low pressure, but also suitable for the high pressure. The closing principle of the valve is that the sealing surface of the flashboard is tightly attached to the sealing surface of the valve seat by means of the pressure of the valve rod, so that the medium is prevented from flowing. The traditional gate valve is easy to damage due to various reasons such as structure, material and the like, has poor sealing performance and is easy to cause medium leakage. Firstly, the traditional valve body and the valve cover are connected through bolts, the space of the inner cavity of the valve body is too large, when a medium enters the cavity, the pressure is increased along with the space, and the bolts bear large static pressure of the medium, so that leakage between the valve body and the valve cover is easily caused. Secondly, the flashboard and the valve seat are sealed and have insufficient hardness, poor roughness, no abrasion resistance, no scouring resistance and easy insertion damage to cause valve leakage. Thirdly, the materials of the valve rod and the valve rod nut are selected improperly, the mechanical strength and the creep property are poor, the deformation is easy, and the torque requirement under the high-pressure working condition cannot be met. Fourthly, most gate valves are forcedly sealed, namely, when the valves are closed, the gate plates are forced to press the valve seats by means of external force, so that the sealing performance of the sealing surfaces is guaranteed. The sealing can be realized only by medium pressure, namely the sealing surface of the flashboard is pressed to the valve seat on the other side by the medium pressure to ensure the sealing of the sealing surface, namely the sealing is realized, but when the pressure of the inner cavity of the valve body is increased, the sealing between the valve body and the valve cover can not be automatically compensated, so that the valve leakage is caused. Although some progress is made, the technical problems still remain in practical application and are not overcome.

Disclosure of Invention

The utility model aims to solve the technical problem that overcome prior art not enough, provide a gate valve is kept apart in vacuum.

The utility model provides a technical scheme that above-mentioned technical problem adopted is: a vacuum isolation gate valve comprises a valve body, a gate plate, a valve seat, a valve rod, a valve cover, a stud, a support, packing, a packing pressing sleeve, a packing pressing cover, a movable joint bolt, a valve rod nut and a transmission device, and is characterized in that a channel is arranged inside the valve body, the valve cover is fixedly sealed above the valve body, the valve rod is arranged in the center of the valve body and penetrates through the valve cover to be connected with the transmission device, the lower end of the valve rod is connected with the gate plate, the valve cover is fixedly connected with the valve body, the valve rod is in transmission connection with the gate plate, the valve seat is symmetrically arranged on two sides of the gate plate, the sealing surface of the valve seat and the sealing surface of the gate plate are both subjected to surfacing welding of stellite hard alloy, a packing bin is arranged on the periphery of the valve rod, the packing is arranged in the packing, the top end of the valve is provided with a transmission device.

Preferably, the valve main body adopts a cast forging structure and is provided with a parallel double-sealing pair semi-forced bidirectional seal, and zero leakage is realized by the stepwise action of in-place movement of a sealing surface and wedge-shaped block wedging incapability movement. Preferably, the sealing surface has small moving friction force and convenient opening and closing, and has the function of automatic compensation of the abrasion of the sealing surface. Preferably, the valve cover packing chamber is provided with a vacuum sealing structure which has a self-expansion and compression effect, and each joint surface is sealed by adopting a high-strength expansion material, so that the system is safely isolated from the atmosphere, and the system has good air tightness. Preferably, the valve is connected in a flange and welding mode, and the driving mode can be manual or electric. Preferably, the valve is suitable for a pipeline with the working temperature of less than or equal to 425 ℃ and less than or equal to 550 ℃ and the working medium of water, steam or air and is used as an opening and closing device; the vacuum sealing device is particularly suitable for a steam turbine condensation and vacuum negative pressure system of a thermal power plant, and plays a role in vacuum isolation and sealing.

The utility model has the advantages that: the self-pressing sealing valve cover can reduce redundant weight, has a simple structure, saves raw materials and labor, is convenient to overhaul, has long service life and good sealing property. The valve seat sealing surface and the flashboard sealing surface are both made of stellite hard alloy in a surfacing mode, and are wear-resistant, scouring-resistant and corrosion-resistant.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

In the figure: 1. the valve comprises a valve body, a gate plate 2, a valve seat 3, a valve rod 4, a valve cover 5, a stud 6, a support 7, a filler bin 8, a filler pressing sleeve 9, a filler pressing cover 10, an eyelet bolt 11, a valve rod nut 12 and a transmission device 13.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in figure 1, the vacuum isolation gate valve comprises a valve body 1, a gate plate 2, a gate plate 3, a valve seat, a valve rod 4, a valve cover 5, a stud 6, a support 7, a packing 8, a packing 9, a packing pressing sleeve 10, a packing pressing cover 11, an eyelet bolt 12, a valve rod nut 13 and a transmission device 13, and is characterized in that a channel is arranged inside the valve body 1, the valve cover 5 is fixedly sealed above the valve body 1, the valve rod 4 is arranged in the center of the valve body 1, the valve rod 4 penetrates through the valve cover to be connected with the transmission device 13, the lower end of the valve rod 4 is connected with the gate plate 2, the valve cover 5 is fixedly connected with the valve body 1, the valve rod 4 is in transmission connection with the gate plate 2, the valve seats 3 are symmetrically arranged on two sides of the gate plate 2, sealing surfaces of the valve seat 3 and the gate plate 2 are both made of hard alloy which is made, the packing pressing sleeve 9 compresses packing, a packing gland 10 is arranged at the upper part of the packing pressing sleeve 9, the packing gland 10 is connected with the valve cover 5 through an eyelet bolt 11, the support 7 is connected with the valve body 1 through welding, and a transmission device 13 is arranged at the top end of the valve.

As shown in figure 1, the valve main body adopts a cast forging structure and is provided with a parallel double-sealing pair semi-forced bidirectional seal, and zero leakage is realized by the stepwise action of the in-place movement of a sealing surface and the wedge-shaped block wedging incapability movement. As shown in figure 1, the sealing surface has small moving friction force, convenient opening and closing and automatic compensation function for the abrasion of the sealing surface. As shown in figure 1, the valve cover 5 is provided with a vacuum sealing structure in the filling chamber, which has self-expansion and compression effects, and each joint surface is sealed by high-strength expansion materials, so that the system is safely isolated from the atmosphere, and the system has good air tightness. As shown in figure 1, the valve is connected in a flange and welding mode, and the driving mode can be manual or electric. As shown in figure 1, the valve is suitable for a pipeline with the working temperature of less than or equal to 425 ℃ and less than or equal to 550 ℃ and the working medium of water, steam or air as an opening and closing device; the vacuum sealing device is particularly suitable for a steam turbine condensation and vacuum negative pressure system of a thermal power plant, and plays a role in vacuum isolation and sealing.

The utility model provides a technical principle that its technical problem adopted is: when the gate plate 2 is opened and closed, the transmission device 13 is started, and the rotary motion is changed into linear motion through the valve rod nut and the guide groove on the valve body, namely, the operation torque is changed into operation thrust, so that the lifting of the valve rod is realized. When the shutter 2 is lifted to a height equal to 1: 1 times the valve diameter, the passage of the fluid is completely clear, but this position is not monitored during operation, and therefore the fully open position of the valve is determined by the position (i.e., stroke) of the shutter. The valve body 1 and the valve cover 5 with the clamp of the valve are supported by die forging, the valve with small diameter is welded on a distribution pipe under most conditions, the valve body is made of steel suitable for welding, and the valve cover 5 of the valve is made of the same material as the valve body 1. When the gate valve is closed, the sealing surface can only depend on medium pressure to seal, namely the sealing surface of the gate plate 2 is pressed to the valve seat on the other side by the medium pressure to ensure the sealing of the sealing surface, namely the self-sealing. Because of adopting the pressure seal valve cover mode, compare with bolt fastening valve cover, basic high pressure is sealed good, light in weight. The traditional high-temperature and high-pressure valve is heavy, and the excessive weight can be reduced by sealing the valve cover by self pressure, so that raw materials are saved and labor force is reduced. The sealing surface of the sealing gasket ring is superfinished by a special processing method, and even if high-temperature and high-pressure fluid enters the sealing gasket ring, the high-temperature and high-pressure fluid cannot leak out from the inside. The flashboard and the valve seat sealing ring are made of chromium steel, chromium molybdenum steel, nickel-chromium steel and the like with high creep strength, which is the characteristic of the high-temperature high-pressure valve. The hard alloy is welded on the valve seat sealing surface and the flashboard sealing surface, so that the valve seat sealing surface and the flashboard sealing surface cannot be bitten, and are wear-resistant, scouring-resistant and corrosion-resistant. The valve rod is also made of alloy steel with high creep strength, which is the same as that of the gate plate, and the surface of the valve rod is subjected to nitriding treatment so as to increase the surface hardness of the valve rod and ensure enough strength. Therefore, the adhesive sticking caused by heat generation can be prevented, and the operation is not good. The number of operation failure times of the high-temperature and high-pressure valve is larger than the number of damage times caused by the pressure-resistant portion, and especially when the operation handle is operated, the operation torque exceeding the rated value is not added by ten million, otherwise, the operation is dangerous.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A vacuum isolation gate valve comprises a valve body, a gate plate, a valve seat, a valve rod, a valve cover, a stud, a support, packing, a packing pressing sleeve, a packing pressing cover, a movable joint bolt, a valve rod nut and a transmission device, and is characterized in that a channel is arranged inside the valve body, the valve cover is fixedly sealed above the valve body, the valve rod is arranged in the center of the valve body and penetrates through the valve cover to be connected with the transmission device, the lower end of the valve rod is connected with the gate plate, the valve cover is fixedly connected with the valve body, the valve rod is in transmission connection with the gate plate, the valve seat is symmetrically arranged on two sides of the gate plate, the sealing surface of the valve seat and the sealing surface of the gate plate are both subjected to surfacing welding of stellite hard alloy, a packing bin is arranged on the periphery of the valve rod, the packing is arranged in the packing, the top end of the valve is provided with a transmission device.

2. The vacuum isolation gate valve as claimed in claim 1, wherein the valve body is of a cast forging structure with parallel double sealing pair semi-forced bidirectional sealing, and zero leakage is realized by the stepwise action of the sealing surface in-place movement and wedge wedging disabling movement.

3. The vacuum isolation gate valve of claim 1, wherein the sealing surface has low moving friction, is easy to open and close, and has an automatic compensation function for the abrasion of the sealing surface.

4. The vacuum isolation gate valve of claim 1, wherein the valve cover packing chamber is provided with a vacuum sealing structure with self-expanding and pressing effects, and each joint surface is sealed by high-strength expansion materials, so that the system is safely isolated from the atmosphere and has good system air tightness.

5. The vacuum isolation gate valve as claimed in claim 1, wherein the valve connection form is flange and welding, and the driving manner can be manual or electric.