CN214999429U

CN214999429U - Bellows seal valve

Info

Publication number: CN214999429U
Application number: CN202121247884.2U
Authority: CN
Inventors: 朱粉华; 邹喜; 范小娟; 朱晨旭
Original assignee: Wuxi Xhk Valve Co ltd
Current assignee: Wuxi Xhk Valve Co ltd
Priority date: 2021-06-04
Filing date: 2021-06-04
Publication date: 2021-12-03
Anticipated expiration: 2031-06-04

Abstract

The utility model provides a bellows seal valve, which is convenient to operate, can effectively prevent the leakage of the conveyed materials, increase the safety of production equipment and ensure the normal movement of the valve; including valve body, actuating mechanism and with the locator that actuating mechanism is connected, relief pressure valve, output are connected with the push rod to actuating mechanism's input connection, the push rod is connected with the valve rod through the clamp splice, the valve body inner chamber is equipped with the disk seat, the valve body is connected with the valve gap, be equipped with the case rather than the adaptation on the disk seat, the valve rod passes behind the valve gap with the case is connected, the valve gap inner chamber is equipped with the bellows, the bellows cover is located behind the valve rod outer wall, bellows bottom portion with valve rod circumference build-up welding is connected, the bellows outer wall with leave the interval between the valve gap inner wall, just the valve rod upper end with be equipped with packing assembly between the valve gap, with the valve rod junction the case is equipped with the uide bushing outward, V type groove has been seted up to the case outer wall.

Description

Bellows seal valve

Technical Field

The utility model relates to a valve seal technical field specifically is bellows seal valve.

Background

The valve is a control part in a fluid conveying system, has the functions of stopping, adjusting, guiding, preventing counter flow, stabilizing pressure, shunting or overflowing and relieving pressure and the like, the valve rod of the existing valve is sealed by adopting packing, and along with the improvement of environmental protection requirements and process requirements of people, a small amount of leakage of a conveyed medium can exist, particularly in special occasions such as valves for conveying inflammable, explosive, toxic and harmful media, the vertical movement of the valve can be influenced by the small amount of leakage, and even more serious consequences can be caused.

Disclosure of Invention

In view of the above problem, the utility model provides a bellows seal valve, its convenient operation can prevent effectively that the transported substance from revealing, increases the production facility security, guarantees the valve normal motion.

The technical scheme is as follows: the bellows seal valve, including valve body, actuating mechanism and with the locator that actuating mechanism is connected, the input of actuating mechanism connects the relief pressure valve, the output is connected with the push rod, the push rod is connected with the valve rod through the clamp splice, the valve body inner chamber is equipped with the disk seat, the valve body is connected with the valve gap, be equipped with the case rather than the adaptation on the disk seat, the valve rod passes behind the valve gap with the case is connected its characterized in that: the valve cap inner chamber is equipped with the bellows, the bellows cover is located behind the valve rod outer wall, bellows bottom end portion with the valve rod circumference build-up welding is connected, the bellows outer wall with leave the interval between the valve cap inner wall, just the valve rod upper end with be equipped with packing assembly between the valve cap with the valve rod junction the case is equipped with the uide bushing outward, the V type groove has been seted up to the case outer wall.

It is further characterized in that:

the adaptive sealing surface on the valve core matched with the valve seat is an inclined surface, and the inclination angle is 25-35 degrees;

the packing assembly comprises a packing, a packing pressing sleeve and a packing pressing plate, the packing is arranged at a connecting gap between the valve rod and the valve cover, the packing is positioned below the packing pressing sleeve, the packing pressing sleeve is pressed at the opening end of the valve cover and is pressed tightly through the packing pressing plate, and the packing pressing plate and the valve cover are fixed through bolts.

The beneficial effects of the utility model are that, when the actuating mechanism acts on, the valve rod is pushed to move up and down, then the rising height of the valve core can be controlled, the valve rod drives the bellows axial to stretch and compress, the bellows is isolated from the medium in the pipeline and the valve rod in the process, except the bellows seal, the packing seal of the common valve is also possessed simultaneously, the secondary seal plays a role when the bellows breaks and fails, the energy efficiency is improved, the safety of the production equipment is increased, the maintenance cost and frequent maintenance are reduced, and a clean and safe working environment is also provided; meanwhile, the V-shaped groove is formed in the outer wall of the valve core, so that a good pressure relief effect can be achieved between the valve core and the guide sleeve, and the working efficiency is improved.

Drawings

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

FIG. 2 is a schematic view of a bellows and valve stem weld configuration;

fig. 3 is a schematic top view of the valve core of the present invention.

Detailed Description

As shown in fig. 1 to 3, the present invention includes a bellows seal valve, which includes a valve body 1, an actuator 2 and a positioner 3 connected to the actuator 2, wherein the actuator 2 is a pneumatic diaphragm actuator, and an electric actuator can also be used; the input end of the actuating mechanism 2 is connected with a pressure reducing valve 4, the output end of the actuating mechanism is connected with a push rod 5, the push rod 5 is connected with a valve rod 7 through a clamping block 6, a valve seat 8 is arranged in the inner cavity of the valve body 1, the valve body 1 is connected with a valve cover 9, a valve core 10 matched with the valve seat 8 is arranged on the valve seat 8, the valve rod 7 penetrates through the valve cover 9 and then is connected with the valve core 10, a corrugated pipe 11 is arranged in the inner cavity of the valve cover 9, the corrugated pipe 11 is sleeved on the outer wall of the valve rod 7, the bottom end part of the corrugated pipe 11 is connected with the valve rod 7 in a circumferential overlaying mode, a medium in a pipeline can be isolated from the valve rod 7, zero leakage of the valve rod 7 is guaranteed, a gap is reserved between the outer wall of the corrugated pipe 11 and the inner wall of the valve cover 9, a packing assembly is arranged between the upper end of the valve rod 7 and the valve cover 9, the sealing effect can be improved, and the leakage amount is reduced; a guide sleeve 12 is arranged outside the valve core 10 at the joint of the valve rod 7, so that the valve core 10 can stably slide and does not vibrate, and a V-shaped groove 13 is formed in the outer wall of the valve core 10, so that a good pressure relief effect is achieved between the valve core and the guide sleeve 12.

The adaptive sealing surface on the valve core 10 matched with the valve seat 8 is an inclined surface with an inclination angle of 30 degrees; the packing assembly comprises a packing 14, a packing pressing sleeve 15 and a packing pressing plate 16, the packing 14 is arranged at a connecting gap between the valve rod 7 and the valve cover 9, the packing 14 is positioned below the packing pressing sleeve 15, the packing pressing sleeve 15 is pressed at the opening end of the valve cover 9 and is pressed tightly through the packing pressing plate 16, and the packing pressing plate 16 and the valve cover 9 are fixed through a bolt 17.

Wherein, the pressure reducing valve 4 is used for adjusting the supply pressure to the pressure value required by the positioner 3 and the like; the valve body 1 is used for ensuring the connection with a pipeline and fixing the positions of a receiving valve inner part and a valve cover 9; the valve core 10 mainly regulates the flow of fluid; the valve seat 8 is matched with the valve core 10 for use, and the opening of the valve core 10 is utilized to adjust the medium flow; the valve cover 9 is combined with the valve body 1 to ensure that the medium in the control valve does not leak.

In the utility model, when the actuating mechanism 2 is communicated with the air source 18, the positioner 3 controls to convey air to the actuating mechanism 2 by receiving 4 mA-20 mA direct current signals, the pressure in the actuating mechanism 2 is increased to control the rising height of the push rod 5, the push rod 5 is connected with the valve rod 7 by the clamping block 6, the valve rod 7 is connected with the valve core 10, namely, the rising height of the valve core 10 is controlled, and simultaneously, the valve rod 7 drives the corrugated pipe 11 to axially stretch and compress, specifically, in the working process, the valve rod 7 drives the corrugated pipe 11 to axially stretch and compress, the corrugated pipe 11 isolates media in a pipeline from the valve rod 7 in the process, the corrugated pipe 11 is sealed, and the corrugated pipe is also sealed by a filler 14 of a common valve, and secondary sealing plays a role in the rupture failure of the corrugated pipe 11, so that the energy utilization efficiency is improved, the safety of production equipment is increased, and the maintenance cost and frequent maintenance are reduced.

The direction of the arrows in the figure is the direction of fluid flow.

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. The bellows seal valve, including valve body, actuating mechanism and with the locator that actuating mechanism is connected, the input of actuating mechanism connects the relief pressure valve, the output is connected with the push rod, the push rod is connected with the valve rod through the clamp splice, the valve body inner chamber is equipped with the disk seat, the valve body is connected with the valve gap, be equipped with the case rather than the adaptation on the disk seat, the valve rod passes behind the valve gap with the case is connected its characterized in that: the valve cap inner chamber is equipped with the bellows, the bellows cover is located behind the valve rod outer wall, bellows bottom end portion with the valve rod circumference build-up welding is connected, the bellows outer wall with leave the interval between the valve cap inner wall, just the valve rod upper end with be equipped with packing assembly between the valve cap with the valve rod junction the case is equipped with the uide bushing outward, the V type groove has been seted up to the case outer wall.

2. The bellows-sealed valve according to claim 1, wherein: the adaptive sealing surface on the valve core matched with the valve seat is an inclined surface, and the inclination angle is 25-35 degrees.

3. The bellows-sealed valve according to claim 1, wherein: the packing assembly comprises a packing, a packing pressing sleeve and a packing pressing plate, the packing is arranged at a connecting gap between the valve rod and the valve cover, the packing is positioned below the packing pressing sleeve, the packing pressing sleeve is pressed at the opening end of the valve cover and is pressed tightly through the packing pressing plate, and the packing pressing plate and the valve cover are fixed through bolts.