Flexible graphite packing seal circle-by-circle pressing device for valve

Abstract

The invention belongs to the field of valve installation, and particularly relates to a circle-by-circle pressing device for a flexible graphite packing seal of a valve. The circle-by-circle pressing device for the flexible graphite packing seal of the valve comprises a connecting bottom plate and a flange which are matched in shape, threaded holes corresponding to each other in position are formed in the connecting bottom plate and the flange, a boss is arranged on the flange, a pressing sleeve is arranged on the boss, and a pressing cover is arranged on the pressing sleeve. The invention has the following technical characteristics: 1, the combined pressing device is reliable in tightness and strong in controllability; dual positioning is achieved, reliability and firmness are achieved, and axial movement of the filler is prevented; 3, the operation is simple, and different working condition requirements are met; and 4, circle-by-circle compression is realized, and the stress is uniform.

Description

Technical Field

[0001] The invention belongs to the field of valve installation, and in particular relates to a circle-by-circle pressing device for sealing of flexible graphite packing of valves. Background Art

[0002] As an important control element of the pipeline, each valve needs to undergo a strict sealing test before leaving the factory. The valve packing plays a key sealing role in the valve, which can fill the gap in the valve sealing surface and avoid medium leakage. Therefore, the packing part must be compressed to ensure the sealing performance of the valve. At present, the domestic valve packing is mainly flexible graphite or 316 wire braided flexible graphite. The material has the characteristics of low creep relaxation rate and excellent flexibility. Therefore, many valve manufacturers basically compress the packing together after placing it in multiple layers. Although this method can improve the installation efficiency to a certain extent, it has fatal defects for the installation quality of the entire valve. The compression force starts from the top, and its force surface is on the top of the packing, which cannot be evenly transmitted to the bottom. The packing is unevenly compressed, the upper packing is over-pressed, and the lower packing is less stressed, and its sealing effect cannot be achieved. It may cause the entire valve to need to be disassembled again, which will seriously affect the product quality and waste unnecessary labor costs. Therefore, how to solve the problem of uniform force on the packing during the compression process so that it can better meet the valve sealing requirements and improve the quality of valve installation is an important problem currently faced. Summary of the invention

[0003] The object of the present invention is to provide a packing seal circle-by-circle pressing device, which can effectively avoid problems such as packing loosening and leakage by pressing the packing circle by circle, thereby improving the sealing effect.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a turn-by-turn compression device for valve flexible graphite packing seal, which includes a connecting base plate and a flange with matching shapes, threaded holes corresponding to the positions are arranged on the connecting base plate and the flange, a boss is arranged on the flange, a pressing sleeve is arranged on the boss, and a pressure cover is arranged on the pressing sleeve.

[0005] As described above, a turn-by-turn compression device for a valve flexible graphite packing seal is provided, wherein a packing is arranged between the boss of the flange and the compression sleeve.

[0006] As described above, a turn-by-turn compression device for a valve flexible graphite packing seal, wherein a nut is arranged on the gland.

[0007] As described above, a turn-by-turn compression device for a valve flexible graphite packing seal is provided, wherein the connecting base plate and the flange are fixedly connected by hexagonal bolts.

[0008] As described above, a turn-by-turn compression device for a valve flexible graphite packing seal, wherein the packing, the compression sleeve, and the pressure cover pass through the connecting bottom plate studs and are fastened by nuts.

[0009] As described above, a turn-by-turn compression device for valve flexible graphite packing seal is provided on the flange, wherein a circular ring is provided on the flange, and the connecting base plate, the pressing sleeve and the pressing cover are double-positioned by the circular ring on the flange.

[0010] As described above, a turn-by-turn compression device for valve flexible graphite packing seal, wherein the compression sleeve and the pressure cover are compressed by arc spherical surfaces.

[0011] The present invention has the following technical features: 1. Combined clamping device, reliable tightness, strong controllability; 2. Double positioning, reliable and firm, preventing axial movement of filler; 3. Simple operation, meeting the requirements of different working conditions; 4. Clamping circle by circle, uniform force. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is an exploded view of a turn-by-turn compression device for packing seal provided in the present application;

[0013] Figure 2 This is a front view of the circle-by-circle compression device for valve flexible graphite packing seal provided by the present application;

[0014] Figure 3 It is a top view of the circle-by-circle compression device for valve flexible graphite packing seal provided by the present application;

[0015] Figure 4 It is a partial cross-sectional view of a turn-by-turn compression device for a valve flexible graphite packing seal provided in the present application;

[0016] Among them, 1. Hexagon bolt; 2. Connecting base plate; 3. Flange; 4. Packing; 5. Pressing sleeve; 6. Pressing cover; 7. Nut. DETAILED DESCRIPTION

[0017] The present application is further described below in conjunction with the accompanying drawings and embodiments.

[0018] A ring-by-ring compression device for the sealing of a flexible graphite packing of a valve includes a hexagonal bolt, a connecting base plate, a flange, a packing, a compression sleeve, a gland, and a nut. The device as a whole adopts a combined connection structure; the connecting base plate, the compression sleeve, and the gland can be double-positioned through the ring on the flange to prevent the packing from being offset during installation; the compression sleeve is engraved with ring lines at intervals of 1 mm, and the compression force can be adjusted according to actual needs during operation to ensure the compression state of the flexible graphite packing, with clear observation and convenient operation; the connecting base plate and the flange at the bottom of the device are fastened by bolts, which can well ensure its operational stability.

[0019] The connecting base plate and flange are installed through special positioning, which helps to ensure the accuracy and stability of the entire assembly structure.

[0020] The connecting base plate and the flange are fastened by hexagonal bolts, which is firm and reliable.

[0021] The packing, the compression sleeve and the pressure cover are passed through the connecting bottom plate studs and fastened by nuts. When tightening, the compression state of the packing is determined by visually observing the position of the engraved lines on the compression sleeve.

[0022] The connecting base plate, the pressing sleeve and the pressing cover can be doubly positioned by means of the ring on the flange to prevent the packing from shifting during installation.

[0023] The compression sleeve and the compression cover are compressed by arc-shaped spherical surfaces, which can be used to produce uniform pressure distribution, improve the sealing performance of the contact surface, and enhance the stability and load-bearing capacity of the connector.

[0024] A specific example is given below.

[0025] The bellows assembly sealing test device of the present invention is assembled from a plurality of parts, including a hexagonal bolt 1, a connecting base plate 2, a flange 3, a packing 4, a pressing sleeve 5, a pressure cover 6, and a nut 7.

[0026] 1. First, fasten the connecting base plate 2 and flange 3 with the hexagonal bolts 1.

[0027] 2. Next, install the packing 4, the pressing sleeve 5 and the pressing cover 6 through the connecting base plate 2 in sequence and fasten them with the nut 7. The tightening state of the packing 4 is determined by observing the position of the engraved lines on the pressing sleeve when tightening.

[0028] 3. Then loosen the nut 7, remove the gland 6 and the sleeve 5 in turn, and then install a piece of packing 4, repeating the tightening process until all the packings are completely tightened.

[0029] The above specific implementation modes are used to explain the present application rather than to limit the present application. Any modifications and changes made to the present application within the spirit of the present application and the protection scope of the claims shall fall within the protection scope of the present application.

Claims

1. A circle-by-circle pressing device for valve flexible graphite packing seal, characterized in that: It comprises a connecting base plate (2) and a flange (3) of matching shapes, threaded holes corresponding in position are arranged on the connecting base plate (2) and the flange (3), a boss is arranged on the flange (3), a pressing sleeve (5) is arranged on the boss, and a pressing cover (6) is arranged on the pressing sleeve (5).

2. A turn-by-turn compression device for valve flexible graphite packing seal according to claim 1, characterized in that: A packing (4) is arranged between the boss of the flange (3) and the pressing sleeve (5).

3. A turn-by-turn compression device for valve flexible graphite packing seal according to claim 2, characterized in that: A nut (7) is arranged on the gland (6).

4. A turn-by-turn compression device for valve flexible graphite packing seal as claimed in claim 3, characterized in that: The connecting base plate (2) and the flange (3) are fixedly connected by means of hexagonal bolts (1).

5. A turn-by-turn compression device for valve flexible graphite packing seal as claimed in claim 4, characterized in that: The packing (4), the pressing sleeve (5) and the pressing cover (6) pass through the connecting bottom plate studs and are fastened by nuts (7).

6. A turn-by-turn compression device for valve flexible graphite packing seal as claimed in claim 5, characterized in that: A circular ring is arranged on the flange (3), and the connecting bottom plate (2), the pressing sleeve (5) and the pressing cover (6) are double-positioned through the circular ring on the flange (3).

7. A turn-by-turn compression device for valve flexible graphite packing seal according to claim 6, characterized in that: The pressing sleeve (5) and the pressing cover (6) are pressed tightly by using arc-shaped spherical surfaces.

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