CN210318517U

CN210318517U - High-temperature high-pressure emptying valve

Info

Publication number: CN210318517U
Application number: CN201921171100.5U
Authority: CN
Inventors: 朱粉华; 邹喜; 范小娟; 潘业雷; 谢坦
Original assignee: Wuxi Xhk Valve Co ltd
Current assignee: Wuxi Xhk Valve Co ltd
Priority date: 2019-07-24
Filing date: 2019-07-24
Publication date: 2020-04-14
Anticipated expiration: 2029-07-24

Abstract

The utility model discloses a high temperature high pressure atmospheric valve, which comprises a valve body, double-screw bolt nut fixedly connected with valve gap is passed through at the top of valve body, the top of valve gap is provided with the film head, the one end of film head is provided with the relief pressure valve, the bottom of film head is provided with the push rod, the other end fixedly connected with clamp splice of push rod, one side of clamp splice is provided with the locator, the locator sets up the below at the relief pressure valve, the utility model discloses the beneficial effect who reaches is: the utility model relates to a high temperature high pressure atmospheric valve, its structural design is ingenious reasonable, the specially adapted high temperature, high pressure differential, sealed grade requires highly, opens rapid steam unloading occasion, also is applicable to other high-pressure gas unloading occasions, has adopted guide's balanced type case structure, has reduced the requirement to actuating mechanism output, joins in marriage less actuating mechanism and just can realize tight sealed under the operating mode of big pressure differential, can also reduce noise at work simultaneously, reduces the fluid and erodees the loss.

Description

High-temperature high-pressure emptying valve

Technical Field

The utility model relates to a high temperature high pressure atmospheric valve, in particular to high temperature high pressure atmospheric valve belongs to technical field.

Background

The blowdown application is one of the most important applications in a combined cycle power plant. These valves must vent the main steam of the waste heat boiler to the atmosphere bypassing the turbine at the very beginning of operation to ensure that the unit temperature does not rise too quickly. This is done because the process line is already hot before allowing steam to dump through the turbine bypass valve to the condenser. In this application, high temperature main steam (high pressure/medium pressure/low pressure) is bypassed to the atmosphere, when the waste heat boiler ignition starts and the pressure and temperature rise to a certain point. Since the control valve is subjected to a full pressure differential, the valve and downstream piping can generate high noise and high vibration. Therefore, a flow restricting device such as a diffuser or a silencer is generally installed downstream. This is designed to provide a back pressure to the valve to limit pressure drop and subsequent noise and vibration. It can also be used to mitigate noise before exiting the system and being introduced into the atmosphere. The sealing degree of the existing high-temperature high-pressure emptying valve is lower when the existing high-temperature high-pressure emptying valve is used, so that the working noise is higher, and meanwhile, the loss of fluid is higher when the fluid is flushed.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to overcome prior art's defect, provide high temperature high pressure atmospheric valve, solved the problem that exists among the prior art.

In order to solve the technical problem, the utility model provides a following technical scheme:

the utility model discloses a high temperature high pressure atmospheric valve, including the valve body, the top of valve body is through double-screw bolt nut fixedly connected with valve gap, the top of valve gap is provided with the film head, the one end of film head is provided with the relief pressure valve, the bottom of film head is provided with the push rod, the other end fixedly connected with clamp splice of push rod, one side of clamp splice is provided with the locator, the locator sets up in the below of relief pressure valve, the clamp splice is kept away from the one end fixedly connected with valve rod of push rod, the other end of valve rod passes the valve gap and extends to the inside of valve body, the inside of valve body is provided with balance cylinder, main valve core, leading valve core, disc spring, sleeve and disk seat, the balance cylinder sets up in the top of main valve core, leading valve core sets up in the inside of sleeve, and the sleeve sets up in the below of main valve core, the, one end of the valve rod extending to the interior of the valve body is fixedly connected with the pilot valve core, and the outer wall of the pilot valve core is sleeved with a disc spring.

As an optimized technical scheme of the utility model, be provided with the sealing medium filler between valve rod and the valve gap.

As an optimized technical scheme of the utility model, be provided with the clamping ring between pilot valve core and the main valve core.

As an optimal technical scheme of the utility model, the one end that the valve body is close to the relief pressure valve is the air inlet, the other end of valve body is the gas outlet.

As an optimized technical scheme of the utility model, locator and external power supply electric connection.

The utility model discloses the beneficial effect who reaches is: the utility model relates to a high temperature high pressure atmospheric valve, its structural design is ingenious reasonable, the specially adapted high temperature, high pressure differential, sealed grade requires highly, opens rapid steam unloading occasion, also is applicable to other high-pressure gas unloading occasions, has adopted guide's balanced type case structure, has reduced the requirement to actuating mechanism output, joins in marriage less actuating mechanism and just can realize tight sealed under the operating mode of big pressure differential, can also reduce noise at work simultaneously, reduces the fluid and erodees the loss.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:

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

fig. 2 is an enlarged view of a portion a in fig. 1.

In the figure: 1. a valve body; 2. a pressure reducing valve; 3. a stud nut; 4. a valve cover; 5. a positioner; 6. a film head; 7. a push rod; 8. a clamping block; 9. a valve stem; 10. sealing medium stuffing; 11. a balancing cylinder; 12. a main valve element; 13. a pilot valve spool; 14. pressing a ring; 15. a disc spring; 16. a sleeve; 17. a valve seat.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.

Examples

As shown in fig. 1-2, the utility model provides a high-temperature high-pressure emptying valve, which comprises a valve body 1, a valve cover 4 is fixedly connected to the top of the valve body 1 through a stud nut 3, a membrane head 6 is arranged above the valve cover 4, a pressure reducing valve 2 is arranged at one end of the membrane head 6, a push rod 7 is arranged at the bottom of the membrane head 6, a clamping block 8 is fixedly connected to the other end of the push rod 7, a positioner 5 is arranged at one side of the clamping block 8, the positioner 5 is arranged below the pressure reducing valve 2, a valve rod 9 is fixedly connected to one end of the clamping block 8 far from the push rod 7, the other end of the valve rod 9 passes through the valve cover 4 and extends into the valve body 1, a balance cylinder 11, a main valve core 12, a pilot valve core 13, a disc spring 15, a sleeve 16 and a valve seat 17 are arranged inside the valve body 1, the balance cylinder 11 is arranged above the main valve core, the valve seat 17 is arranged below the sleeve 16, one end of the valve rod 9 extending to the interior of the valve body 1 is fixedly connected with the pilot valve core 13, and the outer wall of the pilot valve core 13 is sleeved with the disc spring 15.

And a sealing medium packing 10 is arranged between the valve rod 9 and the valve cover 4, so that the medium of the valve rod 9 is sealed and does not leak.

A pressing ring 14 is provided between the pilot valve element 13 and the main valve element 12.

One end of the valve body 1 close to the pressure reducing valve 2 is an air inlet, and the other end of the valve body 1 is an air outlet.

The positioner 5 is electrically connected with an external power supply, so that the device can normally operate.

Specifically, use the utility model discloses the time, pilot valve core 13 is direct to be connected with valve rod 9, actuating mechanism's push rod 7, and main valve core 12 is movable with pilot valve core 13, and pilot valve core 13's up-and-down motion drives main valve core 12 switch. In the closing process of the valve, the main valve element 12 is closed firstly, then the thrust of the actuating mechanism is utilized to close the pilot valve element 13, and the actuating mechanism overcomes the acting force of steam on the small valve element and the counter force and the pre-tightening force of the spring; when the valve is opened, the pilot valve core 13 is opened by the output force of the actuating mechanism, the gas in the balance cavity is discharged, and then the main valve core 12 is lifted, so that the normal adjustment of production is ensured, the requirement on the output force of the actuating mechanism is reduced, tight sealing can be realized by matching a smaller actuating mechanism under the working condition of large pressure difference, meanwhile, the working noise can be reduced, and the fluid scouring loss is reduced. When the valve is started, the positioner 5 receives a 4-20 mA direct current signal to control air conveyed to the film head 6, pressure is increased to push the film so as to control the rising height of the push rod 7, the push rod 7 is connected with the valve rod 9 through the clamping block 8, and the valve rod 9 is connected with the pilot valve core 13. Firstly, the pilot valve core 13 is opened, and a medium enters a pilot control chamber through a flow channel of the valve body 1, a window of the sleeve 16 and a plurality of pilot small holes on the upper part of the main valve core 12 and then flows out through a plurality of pilot small holes at the bottom of the main valve core 12 and a valve seat 17 and a flow channel hole of the valve body 1. When no signal is generated, the membrane head 6 pushes the push rod 7 downwards by the elastic force of the spring reset, and the pilot valve core 13 is closed under the action of the push rod 7 and the disc spring 15, so that the valve is closed.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. High temperature high pressure atmospheric valve, its characterized in that, including valve body (1), double-screw bolt nut (3) fixedly connected with valve gap (4) are passed through at the top of valve body (1), the top of valve gap (4) is provided with film head (6), the one end of film head (6) is provided with relief pressure valve (2), the bottom of film head (6) is provided with push rod (7), the other end fixedly connected with clamp splice (8) of push rod (7), one side of clamp splice (8) is provided with locator (5), locator (5) set up the below at relief pressure valve (2), the one end fixedly connected with valve rod (9) of push rod (7) are kept away from in clamp splice (8), the other end of valve rod (9) passes valve gap (4) and extends to the inside of valve body (1), the inside of valve body (1) is provided with balanced cylinder (11), main valve core (12), The balance valve comprises a pilot valve core (13), a disc spring (15), a sleeve (16) and a valve seat (17), wherein a balance cylinder (11) is arranged above a main valve core (12), the pilot valve core (13) is arranged inside the sleeve (16), the sleeve (16) is arranged below the main valve core (12), the valve seat (17) is arranged below the sleeve (16), one end of a valve rod (9) extending to the inside of a valve body (1) is fixedly connected with the pilot valve core (13), and the outer wall of the pilot valve core (13) is sleeved with the disc spring (15).

2. A high-temperature high-pressure emptying valve according to claim 1, characterized in that a sealing medium packing (10) is arranged between the valve rod (9) and the valve cover (4).

3. A high temperature and high pressure blow-down valve according to claim 1, characterized in that a clamping ring (14) is arranged between the pilot valve spool (13) and the main valve spool (12).

4. A high-temperature high-pressure emptying valve as defined in claim 1, characterized in that one end of the valve body (1) close to the pressure reducing valve (2) is an air inlet, and the other end of the valve body (1) is an air outlet.

5. A high temperature and high pressure atmospheric valve in accordance with claim 1 wherein the positioner (5) is electrically connected to an external power source.