CN204828912U - Valve packing structure - Google Patents

Abstract

The utility model discloses a sealing structure, in particular to a valve stuffing sealing structure. The utility model provides a valve packing sealing structure for reducing the erosion of packing by high-pressure medium, which comprises a valve body, a valve stem, packing packing and a packing gland. The valve body is provided with a packing cavity, and the packing pad, packing The packing, packing gland, and packing gland are installed in the packing cavity in sequence from bottom to top, and the valve stem enters the valve body through the packing pad, packing packing, packing gland, and packing gland. The packing gland, The packing gland, packing packing, and packing pad are tightly pressed on the valve body by bolts; the packing pad is in the shape of a tube, and at least two annular grooves are arranged on the inner wall along the axial interval; the above structure can realize multiple Step throttling and pressure reduction, the pressure has been reduced a lot when it reaches the packing packing, which reduces the tight force required by the medium on the packing packing, and also reduces the erosion of the packing packing by the medium, thereby prolonging the service life of the packing.

Description

Valve packing seal structure

technical field

The utility model relates to a sealing structure, in particular to a valve packing sealing structure.

Background technique

The packing seal structure has been widely used in the field of valves, and its advantage is that it is easy to adjust. This structure sets the packing pressure sleeve on the valve stem. When the packing packing leaks, the packing packing is pressurized, so that the cross section of the packing packing is enlarged. Sealing is achieved again. However, there are common problems in high-pressure valves such as fast erosion and wear of packing packing, serious external leakage and short service life. The traditional high-pressure valve is a common packing pad + packing packing structure, only considering the sealing function of the packing packing, ignoring the wear and tear caused by the relative movement of the valve stem and packing packing as the valve opens and closes, and the high-pressure medium scouring the packing, resulting in valve failure. If the leakage is serious, it will affect the efficiency of the equipment in the slightest, and in severe cases, it will cause loss of production stoppage.

Utility model content

The technical problem to be solved by the utility model is to provide a valve packing sealing structure that can reduce the erosion of the packing by the high-pressure medium.

The valve packing sealing structure adopted by the utility model to solve the technical problem includes a valve body, a valve stem, a packing pad, a packing packing, a packing gland and a packing gland. The valve body is provided with a packing cavity, and the packing The gasket, packing packing, packing gland, and packing gland are installed in the packing cavity in sequence from bottom to top, and the valve stem enters the valve body through the packing pad, packing packing, packing gland, and packing gland. The gland, the packing gland, the packing packing, and the packing pad are pressed into the packing cavity by bolts; the packing pad is in the shape of a tube, and at least two annular grooves are arranged on the inner wall of the packing pad along the axial direction.

Further, the cross section of the annular groove of the packing pad is rectangular.

The beneficial effects of the utility model are: due to the adoption of the packing pad with an annular groove, when the medium flows through the first annular groove of the packing pad, throttling, speeding up, and capacity expansion are performed to complete a throttling and pressure-reducing process. Then repeat the previous process; when the medium flows through the second annular groove of the packing pad, another depressurization process is completed. It reduces the tight force required by the medium to reduce the packing packing, and also reduces the erosion of the packing packing by the medium, thereby prolonging the service life of the packing.

Description of drawings

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

Parts, parts and numbers in the figure: valve body 1, valve stem 2, packing packing 3, packing gland 4, packing gland 5, packing pad 6, annular groove 7.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described. The upper and lower relations in this article are all based on the normal valve installation as a reference, that is, the valve with the operating end as shown in Figure 1.

As shown in Figure 1, the utility model includes a valve body 1, a valve stem 2, a packing packing 3 and a packing gland 4, the valve body 1 is provided with a packing cavity, the packing pad 6, the packing packing 3, The packing gland 4 and the packing gland 5 are sequentially installed in the packing chamber from bottom to top, and the valve stem 2 enters the valve body 1 through the packing pad 6, packing packing 3, packing gland 4, and packing gland 5. The packing gland 5, the packing gland 4, the packing packing 3, and the packing pad 6 are tightly pressed into the packing cavity by bolts; the packing pad 6 is tubular, and the inner wall of the packing pad 6 is axially spaced There are at least two annular grooves 7, and the cross section of the annular groove 7 is rectangular; the packing packing 3, packing gland 4, and packing gland 5 are no different from the traditional packing seals, and the packing glands are sealed by bolts. 5 Apply pressure so that the packing gland 4 presses the packing packing 3, the height of the packing packing 3 becomes smaller, and the radius of the packing packing 3 becomes larger, so that the sealing effect of the packing packing 3 can be adjusted.

The higher the pressure of the valve, the greater the tightening force required for the packing 3, the more the medium will wash the packing 3, and the more the valve stem 2 and the packing 3 will be worn; and the utility model uses Packing pad 6, when the medium flows through the first annular groove 7 of the packing pad 6, throttling, speeding up, and expansion are completed to complete a throttling and decompression process, and then repeat the previous process; when the medium flows through the packing pad 6 When the second annular groove 7 is reached, another decompression process is completed. After multi-stage throttling and decompression, the medium pressure has been reduced a lot when it reaches the packing packing 3, which reduces the tightening force required by the packing packing 3 , It also reduces the erosion of the medium on the packing packing 3, thereby prolonging the service life of the packing packing 3.

Claims (2)

1. Valve packing sealing structure, including valve body (1), valve stem (2), packing pad (6), packing packing (3), packing gland (5) and packing gland (4), the valve The body (1) is provided with a packing cavity, and the packing pad (6), packing packing (3), packing gland (4) and packing gland (5) are installed in the packing cavity sequentially from bottom to top. The valve stem (2) enters the valve body (1) through the packing pad (6), packing packing (3), packing gland (4), packing gland (5), and the packing gland (5), The packing gland (4), packing packing (3) and packing pad (6) are pressed into the packing chamber by bolts; the feature is that: the packing pad (6) is tubular, and the inner wall of the packing pad (6) At least two annular grooves (7) are spaced apart in the axial direction. 2. The valve packing sealing structure according to claim 1, characterized in that: the cross section of the annular groove (7) of the packing pad (6) is rectangular.