CN204961860U - Novel screw thread stop valve - Google Patents

Abstract

The utility model discloses a novel thread cut-off valve. The handwheel is arranged on the top of the valve stem, and the valve stem passes through the top of the valve cover to connect with the valve cover. The lower part of the handwheel is provided with a pressure cap, and the pressure ring is located inside the pressure cap. , the pressure ring is sleeved on the valve stem, the lower part of the pressure ring is provided with a packing ring, the valve cover and the valve body are connected by fastening bolts, the middle part of the valve stem is provided with external threads, the inside of the valve cover is provided with internal threads, the valve stem The bottom end is provided with a concave valve clack, the bottom of the valve clack is provided with threads, the surface of the thread is provided with a sealing air bag, the top of the valve stem is provided with an inflation valve, the inflation channel is set inside the valve stem, and the seal between the inflation channel and the valve clack The airbags are connected. The utility model can not only reduce the frictional force and increase the sealing performance of the stop valve, but also can ensure the stability of the sealing even in the case of abrasion caused by long-term use, is convenient for installation and disassembly, greatly prolongs the service life, and has high Guidance accuracy, easy maintenance.

Description

A New Threaded Globe Valve

technical field

The utility model belongs to the technical field of valves, in particular to a novel thread cut-off valve.

Background technique

Globe valve is the most widely used valve nowadays. Due to the small friction between the sealing surfaces during the opening and closing process, relying on the pressure of the valve stem, the sealing surface of the disc and the sealing surface of the valve seat are closely bonded. It is not only suitable for medium and low pressure. , and is suitable for high pressure. At the same time, the flow direction of the stop valve adopts a top-down structure, so it is directional during installation. The structural length of the stop valve is likely to increase the fluid resistance, and the sealing reliability will be greatly disturbed during long-term operation. At the same time, the general globe valve lacks threads and sealing rings on the disc, which causes the space orientation of the valve body to greatly affect the sealing performance when the valve body is closed. At the same time, during operation, due to wear or seal failure, there is a lack of corresponding remedial measures, and the service life is shortened due to structural defects. Repairs will require replacement of the entire equipment, causing a huge waste of resources in production activities.

Contents of the invention

In order to solve the above problems, the utility model discloses a new type of thread cut-off valve, which can not only reduce friction, increase the sealing performance of the cut-off valve, but also ensure the stability of the seal under the condition of wear and tear caused by long-term use. It is easy to disassemble and greatly extend the service life. It has high guiding precision and is easy to maintain.

In order to achieve the above purpose, the utility model provides the following technical solutions: a new type of threaded stop valve, including a handwheel, a valve stem, a valve cover and a valve body, the handwheel is set on the top of the valve stem, and the valve stem passes through the top of the valve cover Connected with the bonnet, the bonnet is located on the upper part of the valve body, the lower part of the hand wheel is provided with a pressure cap, the inside of the pressure cap is provided with a pressure ring, the pressure ring is sleeved on the valve stem, and the lower part of the pressure ring is provided with a stuffing chamber. It is connected with the valve body through fastening bolts. The middle part of the valve stem is provided with external threads, and the inside of the valve cover is provided with internal threads. The internal threads match the external threads. The bottom end of the valve stem is provided with a concave disc. The bottom is provided with thread, and the surface of the thread is provided with a sealing air bag. The top of the valve stem is provided with an inflatable valve. The inflatable valve is provided with a switch. There is an inflatable pipeline inside the valve stem. The inflatable channel is connected with the inflatable valve. The airtight airbag is connected.

As a preferred solution of the present invention, the inside of the valve body is provided with threads matching with the threads of the valve clack.

As a preferred solution of the present invention, the sealing air bag is arranged on the thread of the valve clack.

As a preferred solution of the utility model, the sealed airbag is made of wear-resistant fiber material.

Compared with the existing ones, the utility model has the beneficial effects: the utility model solves the problem that the sealing effect of the stop valve is not high by adding an inflatable valve, an inflatable channel and a sealed air bag, and the valve is filled with air. The sealing air bag is filled between the disc and the valve body to ensure that the disc can provide a stable sealing effect under high pressure. The valve disc adopts a threaded structure, which has a double sealing effect with the sealing air bag. The valve disc bears pressure, which can effectively prolong the service life of the stop valve. At the same time, there are multiple guide devices in the valve cover during use to ensure that the valve stem has a strong guiding ability under pressure.

Description of drawings

Figure 1 is a schematic diagram of the structure of the globe valve.

List of reference signs: 1-hand wheel, 2-valve stem, 3-bonnet, 4-valve body, 5-pressure cap, 6-disc, 7-pressure ring, 8-packing ring, 9-external thread, 10-sealed air bag, 11-inflation channel, 12-inflation valve switch, 13-inflation valve, 14-valve chamber, 15-fastening bolt.

detailed description

The utility model will be further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the utility model and are not intended to limit the scope of the utility model. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the words "inner" and "outer ” refer to directions towards or away from the geometric center of a particular part, respectively.

As shown in Figure 1, a new type of threaded stop valve includes a hand wheel 1, a valve stem 2, a valve cover 3 and a valve body 4. The hand wheel 1 is located at the top of the stop valve, and the hand wheel 1 is sleeved on the valve stem 2. The valve stem 2 extends into the bonnet 3, the bonnet 3 is connected with the valve body 4, the bottom of the valve stem 2 is provided with a valve disc 6, the valve disc 6 is located inside the valve body 4, the water flow channel of the valve body 4 communicates left and right, and the right The side valve body 4 is higher than the left side valve body 4 .

A pressure cap 5 is provided at the interface between the top of the bonnet 3 and the valve stem 2. The pressure cap 5 is used as a guiding device for fixing the valve stem 2 at the top of the bonnet 3. The pressure cap 5 is annularly sleeved on the valve stem 2. The inside of the cap 5 is provided with a pressure ring 7, the pressure ring 7 can further fix the guiding of the valve stem 2, and the lower part of the pressure ring 7 is provided with a packing ring 8, which can ensure the sealing of the stop valve and reduce friction , the pressure ring 7 and the packing ring 8 are both sleeved on the valve stem 2, an external thread 9 is provided in the middle of the valve stem 2, and an internal thread is provided inside the bonnet 3, and the external thread 9 and the internal thread are tightly fitted on the At the same time, the friction force between the valve stem 2 and the valve cover 3 is reduced, so that it can be twisted more easily. The valve cover and the valve body are connected by fastening bolts 15, and the fastening bolts 15 can tightly fit the valve body and the valve cover together to ensure the tightness of the shut-off valve. The valve disc 6 at the bottom of the valve stem 2 adopts a concave shape, the bottom of the valve disc 6 adopts a threaded structure, and a sealing air bag 10 is arranged on the thread surface. The sealing air bag 10 is made of wear-resistant fiber material, and the sealing air bag 10 and the valve stem 2 The inner inflation channels 11 are connected, and the inflation channels 11 extend to the top of the valve stem 2. An inflation valve 13 is arranged on the top of the valve stem 2, and a switch is arranged on the inflation valve 13. When the shut-off valve needs to be closed, the rotating hand wheel 1 drives the valve stem 2 to rotate, and is transmitted to the valve disc 6 through the guide. The valve disc 6 is set in a concave shape, and the contact edge between the valve disc 6 and the valve body 4 is provided with The sealing ring, the valve clack 6 enters the groove on the valve body 4 vertically, and is screwed into the internal thread on the valve body 4 through the external thread 9 at the bottom of the valve clack 6 until it is closed. After tightening the handwheel 1, the closing operation is completed. At this time, inject air into the inflation valve 13 at the top of the valve stem 2, open the switch, and after injecting suitable air, close the switch. At this time, the sealing air bag 10 covering the thread of the valve flap 6 is inflated to fill the gap at the thread of the valve flap 6, and the double sealing effect is realized by the closure between the threads and the filling of the sealing air bag 10, which fundamentally solves the problem. Due to the poor sealing effect caused by equipment aging, at the same time, the sealing air bag 10 is easy to replace. When the sealing air bag 10 is worn due to friction, it is easy to disassemble, and the sealing performance can be guaranteed by replacing the air bag without replacing the whole part. equipment. When the valve clack 6 needs to be opened, the inflation valve switch 12 is turned on, the air in the sealed airbag 10 is discharged from the inflation valve 13 through the inflation pipe, and after the air is discharged from the sealed airbag 10, it is close to the screw thread, and then the hand wheel 1 is turned to rotate the lift. The disc 6 is lifted to allow the two valve chambers 14 in the valve body 4 to circulate air, that is, to complete the operation of opening and closing the shut-off valve, which is simple and easy, and ensures the smoothness and tightness of the shut-off valve in use.

The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for those skilled in the art, some improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims (4)

1. A new type of threaded stop valve, including a handwheel, a valve stem, a valve cover and a valve body, the handwheel is set on the top of the valve stem, the valve stem passes through the top of the valve The upper part of the body is characterized in that: the lower part of the hand wheel is provided with a pressure cap, the inside of the pressure cap is provided with a pressure ring, the pressure ring is sleeved on the valve stem, the lower part of the pressure ring is provided with a stuffing chamber, and the valve cover and the valve body pass through a tight Connected by solid bolts, the middle part of the valve stem is provided with external threads, the inside of the bonnet is provided with internal threads, the internal threads match the external threads, the bottom end of the valve stem is provided with a concave disc, and the bottom of the valve disc is provided with threads. A sealing air bag is arranged on the threaded surface, an inflation valve is arranged on the top of the valve stem, a switch is arranged on the inflation valve, an inflation pipeline is arranged inside the valve stem, the inflation channel is connected with the inflation valve, and the inflation channel is connected with the sealing air bag on the valve disc. 2. The novel threaded globe valve according to claim 1, characterized in that: the inside of the valve body is provided with threads matching the threads of the disc. 3. The novel threaded stop valve according to claim 1, characterized in that: the sealing air bag is arranged on the thread of the valve disc. 4. The novel threaded stop valve according to claim 3, characterized in that: the sealing air bag is made of wear-resistant fiber material.