CN204739232U - Valve sealing structure suitable for high temperature and high pressure - Google Patents

Abstract

The utility model discloses a valve sealing structure suitable for high temperature and high pressure, comprising a valve body, a valve cover, a valve seat; In the annular groove surrounded by the cover, the valve seat sealing ring is installed in the annular groove surrounded by the valve body and the valve seat; it also includes a transfer sleeve, the upper end of the transfer sleeve is in contact with the cavity sealing ring, and the lower end In contact with the seat seal. The structure forms a middle cavity sealing cavity and a valve seat sealing cavity that are not subject to pressure and temperature fluctuations, and the sealing is reliable.

Description

Valve sealing structure suitable for high temperature and high pressure

technical field

The utility model relates to a sealing structure suitable for high temperature and high pressure valves.

Background technique

The sealing of the high temperature and high pressure medium of the valve mainly adopts the middle cavity pressure self-sealing structure (Wood seal) or the flange seal of the metal toothed gasket; the Wood seal structure is complex, and the seal is easily affected by the fluctuation of the medium pressure and needs to be tightened for the second time, and Fluctuations in pressure can also cause damage to seals, resulting in leaks. The medium flange required for metal tooth gasket sealing is large in size and has a large number of bolts. When the bolts are tightened, the tightening force will leak if the tightening force is slightly uneven. Fluctuations in medium pressure and temperature will also cause changes in the creep pressure of the bolts, resulting in leakage.

Utility model content

Aiming at the above technical problems, the utility model provides a valve sealing structure suitable for high temperature and high pressure, which does not leak when the medium is high temperature and high pressure fluid, and the temperature and pressure fluctuations do not affect the sealing performance.

In order to solve the above technical problems, the technical solution adopted by the utility model is: a valve sealing structure suitable for high temperature and high pressure, including a valve body, a valve cover, and a valve seat; The cavity sealing ring is installed in the annular groove surrounded by the valve body and the valve cover, and the valve seat sealing ring is installed in the annular groove surrounded by the valve body and the valve seat; it also includes a transfer sleeve, and the transfer sleeve The upper end of the cylinder is in contact with the sealing ring of the middle cavity, and the lower end is in contact with the sealing ring of the valve seat.

As an improvement, the upper and lower ends of the transfer sleeve are respectively provided with limit steps that cooperate with the valve cover and the valve seat to form a hard seal.

As a preference, both the cavity sealing ring and the valve seat sealing ring are stainless steel wire mesh reinforced graphite rings. Its deformation can effectively guarantee sealing in the range of 15-30%.

The utility model is beneficial in that: the structure forms a middle cavity sealing cavity and a valve seat sealing cavity free from pressure and temperature fluctuations, and the compression amount of the sealing ring is controlled at about 22%, which is static sealing and reliable sealing. And set the limit step surface to form a hard seal and limit the compression of the sealing ring, thereby producing a double sealing effect of hard and soft, effectively preventing the leakage of high-temperature and high-pressure medium; the force of the bolts of this structure only needs to overcome the medium effect of the bonnet section Force, the number of bolts is small and small, the sealing ring can seal in a large range (15-30%), the compression of the sealing ring takes an intermediate value, and the temperature of the bolts affects the creep stress in time and does not affect the sealing of the sealing ring ; The compression of the sealing ring of this structure, the parts are connected by a set of bolts, the structure is simple, and the disassembly is convenient.

Description of drawings

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

Marks in the figure: 1 bonnet, 2 valve body, 3 middle chamber sealing ring, 4 bolts, 5 transfer sleeve, 6 valve seat, 7 valve seat sealing ring.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in detail.

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

As shown in Figure 1, the utility model comprises valve body 2, valve cover 1, valve seat 6, and valve body 2 is connected with valve cover 1 by bolt 4. It also includes a cavity sealing ring 3 and a valve seat sealing ring 7, the cavity sealing ring 3 is installed in the annular groove surrounded by the valve body 2 and the valve cover 1, and the valve seat sealing ring 7 is installed on the valve body 2 and the The annular groove surrounded by the valve seat 6 also includes a transfer sleeve 5 , the upper end of which is in contact with the sealing ring 3 in the middle cavity, and the lower end is in contact with the sealing ring 7 of the valve seat. The upper and lower ends of the transmission sleeve 5 are respectively provided with limiting steps that cooperate with the valve cover 1 and the valve seat 6 . The cavity sealing ring 3 and the valve seat sealing ring 7 are stainless steel wire mesh reinforced graphite rings.

In the utility model, the middle cavity sealing ring 3 is arranged in the annular groove formed by the valve body 2 and the valve cover 1 to form a soft seal; the valve seat sealing ring 7 is arranged in the annular groove formed by the valve seat 6 and the valve body 2, and the Sleeve 5 compresses to form a soft seal. And the limit step of the transfer sleeve is in contact with the valve cover and the valve seat to form a hard seal. The entire sealing structure is combined with soft and hard seals to prevent external leakage.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (3)

1. be applicable to a valve sealing structure for High Temperature High Pressure, comprise valve body, valve gap, valve seat; It is characterized in that: also comprise lumen seal ring and valve seat insert, described lumen seal ring is installed in the circular groove that valve body and valve gap surround, and described valve seat insert is installed in the circular groove that valve body and valve seat surround; Also comprise one and transmit sleeve, described transmission sleeve upper end contacts with lumen seal ring, and lower end contacts with valve seat insert.

2. a kind of valve sealing structure being applicable to High Temperature High Pressure according to claim 1, is characterized in that: the described upper and lower two ends of transmission sleeve are respectively arranged with the limited step coordinated with valve gap and valve seat.

3. a kind of valve sealing structure being applicable to High Temperature High Pressure according to claim 1, is characterized in that: described lumen seal ring and valve seat insert are Stainless Steel Cloth and strengthen graphite annulus.