RU2002151C1 - Shut-off assembly - Google Patents

Abstract

Usage: in the gas, oil, chemical industries. SUMMARY OF THE INVENTION Saddles and a slide are mounted in a housing with through holes, inlet and outlet nozzles. having a length of the locking part is twice as large as the diameter of the passage hole. On both sides of the locking part of the gate, transverse grooves are made at a distance of no more than the diameter of the passage hole. The locking part of the gate, located along the groove, is equipped on both sides with replaceable ring elements made of ceramic material, contact the surfaces of which are identical to the contact surfaces of gray 2 silt.

Description

The invention relates to valve engineering and can be used for gas, oil, chemical, energy and coal industries,

Known designs of gate assemblies of slide gate valves and ball valves, the working surfaces of the gate or ball of which are fully welded with wear or corrosion resistance by alloys or lined with plates of polycrystalline silicon carbide.

Closest to the proposed technical essence is a locking assembly comprising a housing with a through hole, inlet and outlet nozzles, mounted seats and a flat gate having a length of the locking part at least two times the diameter of the through hole, and on both the sides of the locking part of which have transverse grooves at a distance of not more than the diameter of the passage opening.

A disadvantage of the known design of the locking assembly is its low operational stability. This is explained by the fact that the materials used for protection against abrasive erosion and corrosion do not possess sufficient resistance in abrasive-containing corrosive environments. Full surfacing or lining of working surfaces does not exclude the impact of solid pieces contained in the working medium, and leads to increased consumption of expensive protective materials.

An object of the invention is to increase reliability and reduce the consumption of protective materials.

This goal is achieved by the fact that in the locking unit, comprising a housing with passage holes, inlet and outlet nozzles, mounted saddles and a gate having a length of the locking part at least two times the diameter of the passage hole, and on both sides of the locking part of which transverse grooves are made at a distance of no more than the diameter of the passage opening, the shutter part of the gate on both sides, located behind the transverse groove, is equipped with replaceable ring elements made of ceramic material based A1aOz contact surfaces which are identical to the contact surfaces of the saddles.

Figure 1 shows the locking node in the form of a slide gate valve; figure 2 is the same, view of a ball valve.

In the housing 1 of the valve between the fixed seats 2, 3 is movable

locking element in the form of a flat gate 4. In the locking part of the gate located behind the transverse grooves 5, 6, on both sides, are installed using adhesive

epoxy-based compounds interchangeable annular ceramic elements 7, 8. The contact surfaces of the interchangeable elements are installed in the same plane as the surfaces of the gate part of the gate.

The locking node gate valve operates as follows.

In the closing mode, the gate 4 makes one working stroke equal to the diameter of the passage opening and stops the flow

transported medium. During the second working stroke equal to the outer diameter of the seats (or interchangeable ring elements), the interchangeable ring elements 7, 8 come into contact with the working surfaces of the seats 2, 3 when the flow of the transported medium is stopped, which eliminates the possibility of impact of solid particles contained in flow. In this case, the increased wear and corrosion resistance of the ceramic material of the replaceable elements is fully realized.

The locking unit as an example can be made in the form of a ball (see figure 2).

in the crane body 1 between the fixed saddles 2, 3 there is a movable locking element in the form of a ball 4. In the locking part of the ball located behind the groove 5, on both sides are installed with

by means of adhesive bonding, the replaceable annular ceramic elements 6, 7. The spherical contact surfaces of the replaceable elements coincide with the spherical surface of the locking part of the ball.

The locking node of the ball valve (see figure 2) works as follows.

When the ball is rotated 120 °, the contact surfaces of the removable elements of the ball 6, 7 are aligned with the contact surfaces of the seats 2, 3 and the locking assembly is sealed.

The effectiveness of the proposed technical solution is as follows. Ceramic ring application

elements on the sealing surfaces of the gate or ball provides shock-free working conditions for the ceramic material. Under these conditions, the ceramic material has a significantly higher abrasion resistance than any metal material. Ceramic based on chemically inert, which ensures its high corrosion resistance. Glue connection in the gate

or a ball after developing the technical resource of the locking unit can be destroyed by heat and ceramic rings are replaced with new ones. The use of interchangeable rings improves maintainability. SUMMARY OF THE INVENTION

LOCKING UNIT, comprising a housing with passage openings, inlet and outlet nozzles, seats installed therein and a gate having a length of the locking part at least two times the diameter of the passage, and transverse grooves are made on both sides of the locking part of the gate

The use of ring-shaped interchangeable elements saves the protective material.

(56) Copyright certificate of the USSR No. 1733794, cl. F 16 KZ / 02, 1989.

at a distance of not more than the diameter of the passage opening, characterized in that the locking part of the gate located behind the transverse groove is provided on both sides with removable annular elements made of ceramic material on the basis of the contact surfaces of which

0

identical to affairs.

contact surface

Figure 1

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FIG. I