RU229620U1 - AXISYMMETRIC CONTROL CHECK-SHUT VALVE - Google Patents

Abstract

The utility model relates to the field of mechanical engineering, in particular to valve engineering, namely to an axisymmetric adjustable check valve for pipeline valves and can be used in other industries, including during emergency power outages of power systems. The technical task of the utility model is to create an axisymmetric adjustable check valve with guaranteed tightness along the shutter. The stated task is achieved in that the axisymmetric regulating check valve contains a dismountable body with inlet and outlet flange channels, in the first of which a seat is installed with a sealing ring made of elastomer material, interacting with the sealing field of the plate, fixed on the axial rod, covered by a spring and controlled by an eccentric drive, the eccentric of which is located in the bore of the guide sleeve, connected to a base having windows for the working medium, installed in the outlet flange, the axis of which is normal to the axis of the axial rod and has two supports in the wall on the control sleeve.

Description

The utility model relates to the field of mechanical engineering, in particular to valve engineering, namely to an axisymmetric adjustable check valve for pipeline valves and can also be used in other industries, including in emergency power outages of power systems.

An axisymmetric check valve is known (see RU 208218 F16K 15/06), comprising a detachable body with inlet and outlet flanged channels. In the first, a seat is installed, interacting with a flexible ring made of elastomer material, fixed in a plate spring-loaded relative to the base, fixedly fixed on an axial rod.

The disadvantages of this technical solution include the lack of a locking mode in the valve.

Also known is an axial flow check valve (see RU 213846 F16K 15/06), comprising a housing with inlet and outlet flanged channels, in the first of which a seat is installed with a flexible sealing ring made of elastomer material, interacting with a spherical sealing field of a plate spring-loaded relative to the base, while the axial stem on both sides of the plate interacts with the guide bushings of the base and the inlet seat.

The disadvantages of this technical solution include the lack of a “locking” function.

Also known is a shut-off and check axially symmetric valve (see RU 201206 F16K 15/06), a prototype comprising a dismountable housing with input and output flanged channels, in the first of which a flat inclined sealing field is made, interacting with a mating flat field of a plate mounted on an axial rod, the opposite end of which is connected to a base having channels for the passage of the working medium, fixed in the output flange. A spring is installed outside between the plate and the axial rod, resting on a washer, interacting with an eccentric mounted on the end of the drive shaft, sealed relative to the wall of the housing and controlled from the outside by a handle.

The disadvantages of this technical solution include the difficulty of achieving the valve shutter tightness (when performing the “closed” function) according to class “A” of GOST 9544, especially when operating at high parameters of the working environment P _y and valve parameters D _y > 100.

This is due to the fact that the design solutions used, namely:

1. The console placement of the eccentric transmitting force from the control handle to the washer freely moving along the rod creates a skew of the latter;

2. The washer, in turn, transfers uneven force to the spring element, flexible in the axial direction, connecting the axial rod and the plate, also with a skew;

3. The flexible spring element, under the weight of the massive plate, in turn, strengthens the previously created distortion and tilts the plate, since the weight of the plate contributes to this.

These solutions facilitate the misalignment of the flat sealing fields of the plate and the inlet flange when performing the “closed” valve function.

The disadvantages of this solution include not only the lack of a hermetic locking mode in the valve, but also the lack of a regulation function.

The technical problem solved by this utility model is the creation of an axisymmetric regulating check valve with guaranteed tightness along the shutter.

The stated task is achieved in that the axisymmetric regulating check valve contains a dismountable body with input and output flange channels, in the first of which a seat is installed with a sealing ring made of elastomer material interacting with the sealing field of a plate fixed on an axial rod covered by a spring and controlled by an eccentric drive, the eccentric of which is located in the bore of a guide sleeve connected to a base having windows for the working medium, installed in the output flange, the axis of which is normal to the axis of the axial rod, and has two supports in the wall on the control sleeve.

Fig. 1 shows a longitudinal section of an axisymmetric regulating check valve; Fig. 2 shows view A in Fig. 1.

The valve comprises a detachable body 1 with an inlet flange channel 2 and an outlet flange channel 3. A flexible sealing element 4 is installed in channel 2, interacting with the spherical sealing field of plate 5, connected to an axial rod 7 covered by a spring 6, installed in a guided sleeve 8, connected to a base 9. A bore 10 is made in sleeve 8, in which a drive shaft 13 is installed in holes 11 and 12, sealed relative to the wall of the body by a sealing element 14 and provided with a tail 15 for a control key (not shown in the figure) eccentric 16. On the end of tail 15 an indicator 17 is applied for reading the positions of eccentric 16 from limb 18, from the positions of plate 5 applied to the latter in the valve operating modes: as a check valve "OB", as a shut-off valve "Z" and as a regulating valve with a certain flow rate working environment.

The assembly of the axially symmetric regulating check valve is carried out in the following sequence.

In bore 10 of guide sleeve 8 we place eccentric 16, after which we connect guide sleeve 8 with base 9, and place it in housing 1. Orienting eccentric 16 we insert drive shaft 13 through hole for seal 14 into housing of hole 12 in guide sleeve 8, hole in eccentric 16 and hole 11 also in guide sleeve 8. In this case, connection of eccentric 16 with drive shaft 13 can be square, splined or similar, excluding rotation relative to each other.

After this, we connect the output flange to the body. Then we assemble the assembled unit, plate 5 with axial rod 7 and spring 6 with guide bushing 8, bringing the end of axial rod 7 to contact with the smaller shoulder of eccentric 16.

After that we assemble the body with the seat and the inlet flange, the axially symmetrical regulating check valve is ready for operation. Operation in the check valve mode.

On the tailpiece 15 we install the indicator 17 on the marking “OB”, while the small shoulder of the eccentric 16 interacts with the end of the axial rod 7, forming a passage for the working medium between the sealing fields of the plate 5 and the sealing element 4 annular gap, the area of which is equal to the total area of the windows in the base 9.

When the working medium is in the opposite direction, under the action of spring 6, the plate closes the annular gap between sealing fields 5 and 4. The valve is closed.

Operation in the Shut-off Valve mode. On the tailpiece 15, set the indicator 17 to the "Z" marking, thereby interacting with the eccentric arm 16 with the end of the axial rod 6, pressing the plate with the sealing field 5 to the sealing element 4, closing the annular gap between them and creating a certain specific pressure necessary to seal the valve.

The valve is closed.

Valve operation in control mode.

On the tailpiece 15 we install the indicator on the required mark on the limb 18 corresponding to a certain flow rate of the working fluid depending on the gap between the sealing fields 4 and 5, respectively, between the seat and the plate.

To change the flow rate, it is necessary to move the indicator 17 on the tailpiece 15 to the required mark on the limb 18.

Thus, due to the fact that the axial rod is fixedly fixed with the plate and coaxially placed with a length of at least two diameters in the guide sleeve, which is rigidly connected to the base fixed in the housing, and the control of the plate is carried out by an eccentric fixedly-rotatably mounted on the drive shaft, controlled in accordance with the marking on the outside of the housing, a strictly rectilinear movement of the plate is achieved when performing all the functions of the valve: regulation of the working medium, locking from reverse flow and its complete closure.

Moreover, the difference in the eccentric shoulders determines the maximum stroke of the plate, and the area of the maximum opening of which is equal to the area of the base passage windows, and the combination of the interaction of the spherical sealing field of the plate with the flexible sealing element made of elastomeric material in the seat ensures guaranteed tightness of the valve shutter.

Claims (1)

An axisymmetric regulating check valve comprising a detachable body with inlet and outlet flanged channels, in the first of which a seat is installed with a sealing ring made of elastomer material, interacting with the sealing field of a plate secured on an axial rod, embraced by a spring and controlled by an eccentric drive, the drive shaft of which is sealed relative to the wall of the body, and in the second a base with windows for passing the working medium is installed, characterized in that the axial rod is coaxially placed in the channel of a guide sleeve connected to the base, provided with a bore, in which an eccentric is placed interacting with the end face of the axial rod, mounted on the drive shaft, the axis of which is normal to the axis of the axial rod and has two supports in the wall of the control sleeve.