SU859738A1 - Locking pair - Google Patents

Description

(54) SHUTTLE COUPLE

one

The invention relates to a valve industry, in particular, to the sealing assemblies of the valve shut-off organs, and can be used in various sectors of the national economy, in the chemical industry, in the power industry and others.

A known locking pair, containing a saddle and a locking member with a sealing element in the form of a metal disc, is able to deform under the action of loads and adhere tightly to the saddle sealing surface 1.

However, the tightness of this device is achieved only when the medium is directed to the valve.

A locking pair is also known, comprising a seat with a movable elastic sealing element and a locking member that is controlled by the actuator and interacts with it. A spring washer attached to the locking member 2 is used as a movable sealing element.

The disadvantage of this device is the presence of a wide sealing edge. This requires significant axial forces in creating tightness, which

turn causes a loss of the elastic properties of the seal and a decrease in the efficiency of the device as a whole.

The purpose of the invention is to reduce the axial forces on the drive and increase the efficiency of the locking pair.

This goal is achieved by the fact that in the locking pair containing a seat with a movable elastic sealing element and a locking member interacting with it, controlled by an actuator, the sealing element is made in the form of a flat

10 an annular plate with a sealing edge fixed on its periphery in the saddle and mounted relative to the end of the saddle with a gap, and the diameter of the closure member is less than the outer diameter of the annular plate.

five

FIG. 1 shows the proposed locking pair at the initial moment of closing; in fig. 2 - the same at the intermediate closing time; in fig. 3 - the same at the final moment of closing.

20

The locking pair contains a locking body 1, interacting with the saddle 2 with a movable elastic sealing element, you. Filled in the form of a flat annular plate 3 with a sealing edge 4 fixed in the saddle along its periphery and mounted relative to the end 5 of the saddle with a clearance 6. The locking member 1 is progressively displaced relative to the saddle 2 by means of a drive element 7, and the diameter DI of the locking member is smaller than the outer one diameter Dj of the annular plate 3.

The device works as follows.

When closing the locking member, its impact load from the actuator is perceived at the first moment by the entire sealing edge 4 of the ring plate 3 (Fig. 1), then the ring plate is elastically deformed half-wave in section a-a (Fig. 2) and the sealing edge rotates. The contact voltage increases with decreasing contact surface, which makes it possible to reduce the force applied to the half-wave drive in section aa. (Fig. 2) and the sealing edge rotates. The contact voltage increases with a decrease in the contact surface, which makes it possible to reduce the force on the drive element 7 to ensure the tightness of the gate. With a significant increase in load, which can cause destruction of the sealing edge 4 of the annular plate 3, further deformation occurs on the two half-waves of an elastic sealing element — the annular plate 3 in sections 8th and sec-sec (Fig. 3). The annular plate is in contact with the bottom end of the end 5 of the saddle 2 and the sealing edge 4 turns and comes into contact with its entire surface with the locking member 1, reducing the contact voltages at the outer edge of the sealing edge 4.

The greatest effect from the application of the proposed valve pair is revealed on valves of relatively large dimensions (from Dy. 32 and more). Equally important is also the effect of self-sealing of the sealing element - ring section; 1 types 3 when the medium is fed under the locking organ 1. When the ring area of the ring plate 3 from the central part to the sealing point equal to or greater than the area of the saddle 2, the force on the drive element 7 the tightness of the locking pair is minimal.

Shut-off steam can be used on environments with high temperatures (over 300 ° C), since the casing element is not affected by thermal deformation of the body during heating and cooling.

Technical and economic efficiency from the application of the proposed valve pair is to increase its durability and performance in high-speed valves operating with a valve body against the valve seat, and the possibility of using it in environments with temperatures above

zoo ° s.

Reduced axial force required

for tightness of the locking pair, it allows the use of less drive force,

which reduces the size and weight of the drive and

valve in general.

Claims (2)

Invention Formula A locking pair, comprising a seat with a movable elastic sealing element and a locking member cooperating with it, controlled by a drive, characterized in that, in order to reduce axial forces on drive and improve performance, the sealing element is made in the form of a flat annular plate with a sealing edge fixed on its periphery in the saddle and installed relative to the end of the saddle with a gap, and the diameter of the closure member is smaller than the outer diameter of the annular plate. Sources of information taken into account in the examination 1. US Patent No. 2946552, cl. 251-175, 19in1. 2. Copyright certificate SSSSR number 396520, cl. F 16 K 25/00, 1969 (prototype).