RU2300686C2 - Check valve - Google Patents

Abstract

FIELD: valving systems.

SUBSTANCE: check valve comprises housing with lid, seat mounted inside the housing coaxially to the longitudinal passage, and plate. The plate is mounted on the lever that can rotate around the axis. The sealing bushing is coaxially mounted inside the seat. The bushing cooperates with the answered part of the plate when the valve is cut off. The axis of the rotatable lever is set in the lugs of the yoke that embraces the sealing bushing and is interposed between the bosses of the housing.

EFFECT: enhanced maintainability.

2 dwg

Description

The invention relates to mechanical engineering, namely to the production of pipe fittings and can be used in technological equipment to block the return flow of the medium.

Known check valve (see US patent 5341840, F16K 15/08 from 08/30/1994), containing a one-piece housing, mounted in it a rotary plate, interacting when the flow of the medium is blocked with a seat mounted on a thread in the housing.

The disadvantages of the known should include a low degree of maintainability. When the sealing fields of the seat and disc are worn, the valve must be removed from the process pipe.

Somewhat free from this drawback and the closest analogue is a non-return valve (see RU 2032845, F16K 15/03, prototype), comprising a one-piece housing, a seat mounted in the internal recess of the passage channel, which is sealed and fixed relative to the housing.

The disadvantages of this valve also include a low degree of maintainability, as To replace the extremely worn fields of the saddle and the poppet, without dismantling the housing from the process pipeline, unfasten the saddle, remove the saddle assembly with the housing, separate the saddle and poppet from the pivot arm, then repair (in accordance) the sealing fields and only then assemble the valve.

The aim of the invention is to increase the degree of maintainability of the valve. This goal is achieved by the fact that a sealing sleeve is placed coaxially in the saddle, interacting with the valve closed with its sealing field and the counter plate field, the axis of the pivot arm being installed in the eyes of the clamp covering the sealing sleeve and placed between the bosses of the housing.

Figure 1 shows a longitudinal section of a valve; in Fig.2 a section along aa in Fig.1.

The non-return valve consists of a cover 1, body 2, in which a seat 4 is mounted coaxially with the longitudinal channel 3, for example by welding, and a sealing sleeve 5 is mounted coaxially therein (the sleeve fixing element is not shown in FIG.), Sealed relative to the latter by the sealing element 6. On 5, a clamp 7 is mounted with eyes 8, between which a pivot arm 10 with a plate 11 is placed on the axis 9, which interacts when the channel 3 overlaps with the sealing field 13 of the sleeve 5. The axis 9 is placed between the bosses 14 to Apana 2.

Valve assembly

The saddle 4, the sealing sleeve 5, the clamp 7, the plate 11, the lever 10 and the axis 9 outside the housing on a special technological device are pre-assembled into a single "shutter assembly", where their interaction is checked. Then, the saddle 4 is placed in the bore of the body 2 and secured, for example by welding, after which the assembled “shutter assembly” is placed in the saddle 4 bore through the seal 6, while the axis 9 is placed between the bosses 14 of the body 2, and the sealing sleeve 5 is fixed in the saddle 4. After that, the housing 2 is assembled with a cover 1, the valve is ready for operation.

At the maximum wear of the sealing fields 12 and 13, respectively, the plates 11 and the sealing sleeve 5, replace the "shutter assembly". To do this, the cover 1 is removed from the housing 2, then the sealing sleeve 5 with the seat 4 is disassembled and the entire “shutter assembly” - the sealing sleeve 5, the clamp 7, the plate 11 with the lever 10 and the axis 9 are removed from the housing and replaced with the “shutter assembly” by identical, made in advance. Then fix the sleeve 5 in the saddle 4 and assemble the cover 1 with the housing 2 or replace the sleeve 5 and restore (repair) the sealing field of the plate 11.

The valve is ready for operation again.

Thus, due to the fact that the plates are mounted on a removable sealing sleeve, and the axis does not fall out, it is guaranteed by bosses, between which the clamp eyes with a lever are placed, it became possible to repair the valve without dismantling it from the process equipment with less time, which undoubtedly increases the degree of maintainability check valve.

Claims (1)

A non-return valve comprising a cover and a housing with a saddle fixed therein coaxially to the longitudinal channel and a plate mounted on a lever pivoting relative to the axis, characterized in that a sealing sleeve is disposed coaxially in the seat, interacting when the valve is closed with its sealing field and the counter plate field, the axis the pivot arm is installed in the eyes of a clamp covering the sealing sleeve and is placed between the bosses of the housing.

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