CN210770627U - Soft sealing structure for preventing medium from permeating into packing box of lifting rod valve - Google Patents

Abstract

The utility model provides a medium is prevented to lifter valve to filler box infiltration soft seal structure installs a soft seal pad on the lifter of lifter valve, and the soft seal pad is installed in valve plate and lifter junction to the valve plate is spacing down as, and valve department like this when opening the position fully, the lifter rises to the highest point, extrudees with the boss cooperation on the valve gap, makes the soft seal pad warp and reaches sealed effect. The utility model discloses compare in current technique, have following advantage: the sealing is soft sealing, the sealing effect is easier to realize than hard sealing, the processing difficulty is far less than that of the former hard sealing, the precision, the roughness and the smoothness required by the sealing surface are low, the structure is simple, and the sealing is safe and reliable.

Description

Soft sealing structure for preventing medium from permeating into packing box of lifting rod valve

Technical Field

The utility model belongs to the valve field specifically says so an upper seal structure of valve.

Background

One type of seal that prevents the leakage of media to the stuffing box when the valve is fully open is referred to as the upper seal.

When the lifting rod valve is in a closed state, the pressure in the body cavity is lower than the working pressure, so that the pressure of the medium on the filler is small. When the valve is opened, the packing part is required to bear working pressure, and if the upper sealing structure is arranged, the working medium pressure can be prevented from acting on the sealing packing, so that the service life of the sealing packing is prolonged, and the valve is prevented from leaking. The other function is that when the sealing packing has leakage, the valve can be fully opened to seal the upper sealing part, so that the packing gland or the packing pressing sleeve can be loosened to increase the packing and then the packing gland is pressed tightly, thereby ensuring the sealing of the valve packing without leakage.

The sealing structure in the market at present is realized by tightly matching an inverted cone structure on a valve rod and a sealing seat on a valve cover as shown in figure 1, belongs to sealing between metal and metal, and has high requirements on the processing precision of parts and the surface smoothness of a sealing surface, so that the sealing structure cannot be collided or scratched in the assembling and transporting process, otherwise, the sealing effect can be failed.

Disclosure of Invention

The utility model provides a technical problem that above-mentioned existence was solved to soft seal structure.

The utility model discloses a solve through following scheme the problem: the utility model provides a soft seal pad of installation on the lifter of lifter valve is prevented medium to packing box to lifter valve to the soft seal pad is installed at valve plate and lifter junction to the valve plate is spacing down as, and when the valve was located full open position like this, the lifter rose to the highest point, and with the boss cooperation extrusion on the valve gap, made the deformation of soft seal pad reach sealed effect.

The utility model discloses compare in current technique, have following advantage: the sealing is soft sealing, the sealing effect is easier to realize than hard sealing, the processing difficulty is far less than that of the former hard sealing, the precision, the roughness and the smoothness required by the sealing surface are low, the structure is simple, and the sealing is safe and reliable.

Drawings

Fig. 1 shows a prior art upper seal.

Fig. 2 is the upper sealing form provided by the present invention.

Detailed Description

The present invention will now be further described with reference to the accompanying drawings.

In the process of assembling the lifting rod valve, when the valve plate and the lifting rod are assembled together, a soft sealing gasket is arranged on the lifting rod, the soft sealing gasket is arranged at the joint of the valve plate and the lifting rod, after the valve is assembled, when the valve is positioned at a full-open position, the lifting rod is lifted to the highest position and is matched with a boss on the valve cover to extrude, so that the soft sealing gasket deforms to achieve a sealing effect.

Finally, it is noted that the above examples are only intended to illustrate the technical solutions of the present invention and not to limit the same, and although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.

Claims (1)

1. The medium is prevented to the filler box infiltration soft seal structure by the lifter valve, installs a soft sealing pad on the lifter of lifter valve, and the soft sealing pad is installed in valve plate and lifter junction to the valve plate is spacing down as, and when valve department was in full open position like this, the lifter rose to the highest point, and boss cooperation extrusion on the valve gap makes the soft sealing pad warp and reaches sealed effect.

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