SU427196A1 - GATE VALVE FOR BIG DIAMETER PIPELINES - Google Patents

Description

one

Valves are known in which the sealing medium is supplied to a spacer device, made in the form of an elastic ring, through a hollow spindle.

However, these devices are large in size as they are executed with a retractable spindle.

In order to reduce overall dimensions, increase the reliability and durability of the valve, the spacer device, in addition to the elastic element creating a thrust in the closed position, contains a rigid element with openings for the passage of the non-sliding spindle when the valve is opened.

The sealing medium supply unit in the spacer device is made of two coaxial nozzles that come into contact when the valve is closed, one of which is installed on the valve body and the other on the valve plate and moves with it.

The proposed valve can be provided with both two and one locking plates. In the latter case, one end of the spacer is silenced by the bottom, and in the valve body there is a stop made, for example, in the form of a cross.

Continuous drainage is provided from the spacer chamber. Due to this, it is achieved that the spacer pressure is relieved after cessation of the medium supply to the spacer chamber and is eliminated

the possibility of condensation of the stagnant environment in the closed position of the shutter.

FIG. 1 shows the proposed valve in the closed position from the inlet side of the medium; in fig. 2 is a section along A-A in FIG. one; in fig. 3 is a section along BB in FIG. one.

The valve includes a housing / with a saddle 2, an emphasis 3, made in the form of a cross in the flange of the housing, a plate 4, a spacer mounted on the plate, consisting of an elastic element 5 and a rigid element 6. The rigid element shows holes 7 that serve for passage spindle with open valve.

The valve also contains the running nut 8, the spindle 9, the actuator 10, the pipeline // supplying steam to the spacer device (Fig. 3) with a stop valve 12 mounted on it, a drainage tube 13. In the valve there is

the gap 14, providing free movement of the shutter.

The part of the assembly, mounted on the valve plate, includes a nozzle-tip

15, one end of which is hingedly connected to the pipeline 16, and the second end is made in the form of a hemisphere. The second part of the assembly is installed in the valve housing and includes a fitting 17, a movable cone 18, a spring 19

and a restrictor nut 20. The sealing medium to the spacer device is supplied from a source with a pressure greater than the pressure of the medium in the pipeline in which the valve is located.

.To ensure proper movement of the plate, guides are provided in the valve body.

For the valve in the closed position, the actuator 10 is turned on, and the plate closes the opening of the valve. At this moment, the pipe 16 (Fig. 3) with the spherical end of the nozzle-tip 15 comes into contact with the cone 18. The density in the joint is created by the force of the spring 19. Thus, two hinges are formed in the steam supply unit to the spacer device parts relative to the other without disturbing the density of the pipeline.

When the valve is closed, the actuator is shut off.

By opening the valve 12, sealing medium is supplied to the spacer.

When this occurs, the spacer deforms (Fig. 2), the gap 14 is selected, and the bottom of the expansion device is distributed between the stop 3 and the valve plate 4. This will force the valve to seal. The required value of the force of the forced compaction is achieved by selecting the diameter of the spacer and the pressure of the sealing medium.

Before opening the valve, the supply of the sealing medium B to the spacer stops the valve 12. The pressure in the internal cavity of the spacer is equalized with the pressure in the pipeline due to the flow through the drain pipe 13. In this case, the hydraulic spacer disappears and the elastic forces return the spacer to its original position. The gap 14 is restored, allowing the plate to move freely with the spacer device inside the valve body when it is opened.

Subject invention

Claims (2)

1. A valve for pipelines of large diameters containing closures a spacer device that creates a sealing force when the sealing medium is supplied to it, an iodine sealing medium unit, characterized in that, in order to reduce the size due to the use of a non-sliding centerpiece, the spacer device is made with openings that are hermetically separated from its internal floor to pass through nnh shpindel. 2. The bolt according to claim 1, characterized in that the node for supplying the sealing medium to the spacer device is made of two coaxial nozzles that are in contact with each other only when the valve is closed, one of which is installed in the valve body, and the other is on the plate and the valve does not fit with it. 7/5 Thebes, 1 / 5 - L .2 Vuz5