CN205036875U - Low -temperature brake valve - Google Patents

Abstract

The utility model discloses a low-temperature gate valve, which comprises a valve body, a valve cover, a valve stem, a stuffing box, a gate plate and a bearing seat. The valve cover is composed of an upper valve cover and a lower valve cover welded. The inner side of the upper bonnet; the upper part of the valve stem is provided with a trapezoidal thread, and the lower part of the valve stem is set as a T-shaped structure. The T-shaped structure is fixedly installed in the T-shaped groove opened on the gate plate. , which cooperates with the hard alloy at the bottom of the stuffing box; the bottom of the stuffing box is provided with a packing pad, the top of the packing pad is provided with packing, the top of the packing is provided with a packing gland, and the top of the packing gland is provided with a packing gland. The bearing The seat and the valve cover are threaded, and the bearing seat is sleeved with a bearing. The utility model has the advantages of stable performance of the valve stem, long service life of the stuffing, reduced leakage of the valve and stable internal pressure of the valve body.

Description

A low temperature gate valve

technical field

The utility model relates to a valve, in particular to a low-temperature gate valve suitable for technical fields such as petroleum, chemical industry, natural gas, heat supply, and gas pipeline network.

Background technique

The rapid development of global industrialization has made cryogenic valves more and more widely used, and the demand is also increasing. The working conditions of low-temperature valves are harsh, especially in the petrochemical industry. The low-temperature medium is not only flammable and explosive, but also gasifies when the temperature rises, and the volume expands several times; the leakage of low-temperature medium in production is not only the loss of the enterprise, but also The leakage of some toxic media will also cause environmental and personnel health hazards; therefore, we must pay absolute attention to the leakage of cryogenic valves, especially the leakage of cryogenic valves.

Utility model content

The technical problem to be solved by the utility model is to provide a low-temperature gate valve with simple structure and convenient use.

In order to achieve the above object, the technical scheme of the utility model is as follows:

A low-temperature gate valve, including a valve body, a valve cover, a valve stem, a stuffing box, a gate plate and a bearing seat, the valve cover is composed of an upper valve cover and a lower valve cover welded, and the stuffing box is arranged on the inner side of the upper valve cover The upper part of the valve stem is provided with a trapezoidal thread, and the lower part of the valve stem is set as a T-shaped structure. The T-shaped structure is fixedly installed in the T-shaped groove opened on the gate plate. Carbide fit at the bottom; the bottom of the stuffing box is provided with a packing pad, the top of the packing pad is filled with packing, the top of the packing is provided with a packing gland, and the top of the packing gland is provided with a packing gland. The space is threaded, and the bearing seat is covered with a bearing.

In one embodiment of the present invention, the bottom of the stuffing box is provided with a surfacing groove, and hard alloy is surfacing in the surfacing groove.

In one embodiment of the present utility model, the cryogenic gate valve further includes a gasket, and the gasket is arranged between the valve body and the valve cover.

In one embodiment of the present invention, the bearing is made of PCTFE material, which is arranged in the inner hole of the bearing seat, and a pressure relief groove is provided at the inner diameter of the bearing.

In one embodiment of the present utility model, the packing pad is circular, with a through hole in the middle, and is sleeved on the valve stem during installation.

In one embodiment of the present invention, the packing gland is cylindrical, with a through hole in the middle, and is set on the valve stem during installation.

In one embodiment of the present utility model, the packing gland is in the shape of a disc with a hole in the center, and is sleeved on the valve stem during installation.

In one embodiment of the present invention, the cryogenic gate valve further includes two symmetrically arranged swing bolts, the screw part of the swing bolt passes through the packing gland, and the lower end hole is connected to the upper valve cover through a pin.

Through above-mentioned technical scheme, the beneficial effect of the utility model is:

The utility model has the advantages of stable performance of the valve rod, long service life of the stuffing, reduced leakage of the valve and stable internal pressure of the valve body.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a structural representation of the utility model;

Fig. 2 is a partial structure sectional view of the utility model;

The corresponding part names indicated by numbers and letters in the figure:

10. Valve body 20, upper bonnet 30, lower bonnet 40, valve stem 41, T-shaped structure 50, stuffing box 51, hard alloy 52, stuffing pad 53, stuffing 54, stuffing gland 55, stuffing gland 60 , Bearing seat 61, bearing 70, gate plate 71, T-shaped slot 80, swing bolt 81, screw part 82, lower end hole 83, nut.

detailed description

In order to make the technical means, creative features, goals and effects achieved by the utility model easy to understand, the utility model will be further elaborated below in conjunction with specific illustrations.

Referring to Fig. 1 and Fig. 2, the utility model discloses a low temperature gate valve, comprising a valve body 10, a valve cover, a valve stem 40, a stuffing box 50, a gate plate 70 and a bearing seat 60, the valve body 10 and the valve cover There is a gasket (not shown in the figure) between them, the bonnet is composed of the upper bonnet 20 and the lower bonnet 30 welded, the stuffing box 50 is arranged on the inner side of the upper bonnet 20, and the bottom of the stuffing box 50 is provided with a surfacing groove , surfacing welding carbide 51 in the surfacing groove, the lower part of the stuffing box 50 is provided with an inner hole, and the inner hole processing thread is processed into a cylindrical shape by grinding, which has a high degree of smoothness and coaxiality; the valve stem is in the shape of a round rod , the upper part is provided with trapezoidal thread, the lower part of the valve stem 40 is set as a T-shaped structure 41, and the T-shaped structure 41 is fixedly installed in the T-shaped groove 71 opened on the gate plate 70, which can drive the valve stem 40 by handwheel operation. Drive gate 70 up and down to drive the valve to open and close. The stepped slope in the middle of the valve stem 40 cooperates with the hard alloy 51 at the bottom of the stuffing box 50 to play a sealing role, and can effectively slow down the erosion and wear of the low-temperature medium on the packing and prolong the use of the packing. In an emergency, the valve can be fully opened to replace the packing; the bottom of the stuffing box 50 is provided with an annular packing pad 52, and the middle part of the packing pad is provided with a through hole, which is sleeved on the valve stem 40 during installation; Filling 53 is filled above the pad 52, and the filler is filled in the stuffing box with graphite clip Inconel wire; a cylindrical packing gland 54 is provided above the packing 53, and a through hole is provided in the middle of the packing gland, which is set on the valve stem during installation. ; The top of the packing gland 54 is provided with a packing gland 55, the packing gland 55 is a disc shape with a hole in the center. A symmetrically arranged swing bolt 80 is fixed. The swing bolt 80 includes a screw part 81 and a lower end hole 82. The screw part 81 of the swing bolt passes through the packing gland 55, and the upper part is fixed by a nut 83, and the lower end hole 82 passes through a pin shaft. It is connected with the upper valve cover 20; the bearing seat 60 is a cylindrical structure, and it is threadedly connected with the lower valve cover 30. The inner sleeve bearing 61 of the bearing seat 60 is made of PCTFE and is installed in the inner hole of the bearing seat. The valve stem plays a supporting role. The purpose of the support is to increase the stability of the valve stem when it is opened and closed. Since the valve stem of the low-temperature valve will be lengthened to ensure the medium temperature during use, its stability will decrease; the inner diameter of the bearing is processed The pressure relief groove can reduce the abnormal pressure increase of the gasification space; the setting of the bearing seat and the bearing greatly strengthens the stability of the valve stem and increases the service life of the valve.

After the valve of the utility model is installed, there is a sealing structure between the inclined surface of the middle part of the valve stem and the inner side of the upper part of the valve cover (that is, the bottom of the stuffing box). The stuffing in the stuffing box is eroded to prolong the service life of the stuffing and reduce the possibility of leakage.

Since the working condition of the valve is a low temperature state, the valve stem is somewhat longer in structural length than conventional valves. In order to meet the stability of the extended valve stem, the middle support form is changed, and the middle support of the valve stem is added to increase its stability.

The basic principles and main features of the present utility model and the advantages of the present utility model have been shown and described above. Those skilled in the art should understand that the utility model is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model The new model also has various changes and improvements, and these changes and improvements all fall within the scope of the claimed utility model. The scope of protection required by the utility model is defined by the appended claims and their equivalents.

Claims (8)

1. a low-temperature brake valve, comprises valve body, valve gap, valve rod, stuffing box, flashboard and bearing support, it is characterized in that, described valve gap is welded to form by bonnet and bottom flange, and described stuffing box is arranged on the inner side of bonnet; The top of described valve rod is provided with trapezoidal thread, and stem lower portion is set to T-type structure, and this T-type structure is fixedly mounted in T-slot that flashboard is offered, the processing step inclined-plane, middle part of valve rod, and it coordinates with cemented carbide bottom stuffing box; The bottom of stuffing box is provided with Packing seat, fills filler above Packing seat, and the top of filler is provided with filler pressing sleeve, and the top of filler pressing sleeve is provided with Gland, described bearing support with between bottom flange for being threaded, bearing support is arranged with bearing.

2. a kind of low-temperature brake valve according to claim 1, is characterized in that, the bottom of described stuffing box is provided with heap weld groove, pile-up welding hard alloy in heap weld groove.

3. a kind of low-temperature brake valve according to claim 1, is characterized in that, described low-temperature brake valve also comprises a pad, and described pad is arranged between valve body and valve gap.

4. a kind of low-temperature brake valve according to claim 1, is characterized in that, described bearing adopts PCTFE material to make, and it is arranged in inner hole of bearing seat, and the inner radius of bearing is provided with gas pressure relief slot.

5. a kind of low-temperature brake valve according to claim 1, is characterized in that, described Packing seat is ring, is provided with through hole in the middle part of it, interiorly during installation is enclosed within valve rod.

6. a kind of low-temperature brake valve according to claim 1, is characterized in that, described filler pressing sleeve is cylindrical shape, is provided with through hole in the middle part of it, is enclosed within valve rod during installation.

7. a kind of low-temperature brake valve according to claim 1, is characterized in that, disc with holes centered by described Gland, is enclosed within valve rod during installation.

8. a kind of low-temperature brake valve according to claim 1, is characterized in that, described low-temperature brake valve also comprises two symmetrically arranged swing bolts, and the screw portion of swing bolt is through Gland, and lower stomidium is connected with bonnet by bearing pin.