RU2603223C2 - Differential pressure control device - Google Patents

Abstract

FIELD: production of fittings.

SUBSTANCE: differential pressure control device includes housing with detachable bottom, cover with overlapped opening, gate with through hole located between housing and cover, lever acting on gate via roller, spacer ring arranged between cover and detachable housing bottom. In housing bottom and cover seats sealing couplings of gate and cover, gate and bushing housing bottom from rigid antifriction material, at ends of which forming sealing surfaces labyrinth seal grooves are made. Coupled with gate bushings edges have edge angle α≤60 degrees. Bushings made from rigid antifriction material with labyrinth seals floating in housing bottom and bushing cover corresponding seats are spring-loaded with stiff springs on end faces relative to seats bottom on side opposite to labyrinth seals and thus pressed by labyrinth sealing surfaces to gate plane. Round cross-section sealing rings, which are made from elastomer, are installed on cover and detachable housing bottom diametrical surfaces contacting with bushings. Device is equipped with spring-loaded hydraulic cylinder, which is fixed in position relative to device housing, and spring-loaded hydraulic cylinder rod is articulated with flat lever via lug and tie rod arranged in plane of detachable bottom slot with possibility of rotation torque transmission through hexagon and roller to gate.

EFFECT: invention is aimed at preventing of emergency situation occurrence at sharp increase of pressure drop with sudden increase of product working flow rate.

1 cl, 5 dwg

Description

The invention relates to valves, designed to control the pressure drop of a liquid or gas medium and can be used in the oil and gas industry to control the level of a liquid medium in gas separators, as well as shutoff valves on production lines to shut off the flow or create a given pressure drop.

Known valve with a rotating plate (patent No. DE 3538404 A1, F6K 3/06, 04/30/1987), comprising a housing with a blocked passage opening, consisting of two parts, between which a valve plate with a passage moves along the sealing surface with antifriction properties along an arc .

A disadvantage of the known gate valve is its short service life due to the rapid wear of the sealing surface with antifriction properties and, as a result of this, a partial loss of tightness of the interface between the plate and the sealing surface caused by the abrasive action of solid particles of natural gas or oil contaminants on the sealing surfaces. Solid particles are captured by blunting the edges of the plate, mating with the sealing surfaces, when moving relative to the sealing surfaces, are held there and when moving cause deep scratches and grooves on the sealing surfaces.

A device for regulating the differential pressure (RU, patent No. 2191308 C2, F16K 3/06, 10/20/2002), comprising a housing with a blocked opening, a lid, a gate with a through-hole of a profiled shape located between the housing and the lid, sealing elements, a lever, acting on the gate through the roller.

The disadvantages of the known device are:

- irrational design of the device, expressed in that the accuracy of the gap between the housing and the cover, designed to accommodate the gate between them, is not automatically ensured by the assembly of the mating elements, but requires adjustment;

- not enough technological design of the case for manufacture in small-scale production, the grinding process in the blind hole of the end face of the case mating with the gate is difficult;

- wear of the gate and, as a result, a partial loss of sealing between the gate and the sealing elements, caused by the fact that solid particles of natural gas or oil contaminants are caught by the blunting of the edges of the sealing elements mating with the surface of the gate and are brought under the sealing surface of the sealing element mating with with a gate, they partially penetrate into the body of the sealing element and are held in it, thereby forming, as it were, an abrasive tool that causes deep risk and on the sealing surface of the gate. This is possible due to the introduction of solid particles from the outside due to the significant flexibility of the material of the sealing elements, for example, an elastomer, determined by the functional purpose of the elements.

A device for adjusting the differential pressure (RU, patent No. 2330202 C1, F16K 3/06, 10/05/2006), comprising a housing with a removable bottom and a cover with holes to be blocked therein, a gate with a through hole, sealing elements, a lever, a roller . A distance ring is installed between the housing and the cover. The gates of the gate and cover, gate and bottom of the housing are sealed with floating sealing elements. They are made in the form of bushings made of hard antifriction material. The bushings are spring-loaded with O-rings made of elastomer. At the ends of the bushings, grooves of the labyrinth seal are made. The edges of the bushings mating with the gate have a point angle a≤60 degrees.

A disadvantage of the known device is the loss of reliability, resource, tightness of the device during its operation. The disadvantage is that in the known device, the floating bushings with diametrical and axial clearances relative to the seats of the removable bottom and the cover are spring-loaded relative to the bottom of the seats by O-rings of elastomer, which during operation and contact with contaminants change their rigidity, shape and characteristics during transition the gate position between the Full Pass and Locked device states. This negatively affects the operation of the gate, leads to a change in torque on the lever associated with the gate, loss of reliability, resource and tightness of the known device.

A device for regulating the differential pressure (RU, patent No. 2466319 C1, F16K 3/06, F16K 3/30, 10.11.2012), comprising a housing with a removable bottom, a cover with overlapping holes in them, a gate with a through hole located between the housing and a cover, a lever acting on the gate through the roller, a spacer ring installed between the cover and the removable bottom of the housing. In the nests of the bottom of the body and cover, the sealing mates of the gate and cover, the gate and the bottom of the body, the sleeve of hard antifriction material, at the ends of the labyrinth seal. The edges of the bushings mating with the gate have a point angle α≤60 degrees. The floating in the corresponding sockets of the bottom of the body and the cover of the sleeve made of hard antifriction material with labyrinth seals are spring-loaded at the ends relative to the bottom of the nests from the side opposite the labyrinth seals, with end hard springs and thereby pressed by the labyrinth sealing surfaces to the gate plane. On the diametrical surfaces of the cover and the removable bottom of the housing in contact with the bushings, O-rings of elastomer are installed.

A disadvantage of the known device is the lack of timely warning of a sharp increase in pressure drop with a sudden increase in the flow rate of the working product, which leads to the possibility of an emergency.

This known device is the closest in technical essence and the achieved results to the claimed invention.

The objective of the invention is to increase the reliability and resource of the device.

The technical result is a warning of the possibility of an emergency with a sharp increase in pressure drop with a sudden increase in the flow rate of the working product.

The problem is solved, and the technical result is achieved by the fact that the device for regulating the differential pressure, comprising a housing with a removable bottom, a cover with holes to be blocked in them, a gate with a through hole located between the housing and the cover, a lever acting on the gate through the roller, remote a ring installed between the cover and the removable bottom of the case, and in the slots of the bottom of the case and cover the sealing mates of the gate and cover, the gate and the bottom of the case, the bushings of hard antifriction material, in the ends of which, forming evasive surfaces, grooves of the labyrinth seal and the cover of the bushings mating with the gate are made, have an angle of sharpening α≤60 degrees and floating in the corresponding sockets of the bottom of the housing and cover, the bushings of hard antifriction material with labyrinth seals at the ends are spring-loaded relative to the bottom of the sockets with side opposite to the labyrinth seals, end hard springs and pressed thereby labyrinth sealing surfaces to the plane of the gate, and on the diametrical surfaces the cover and the removable bottom of the housing in contact with the bushings, O-rings of elastomer are installed, according to the invention is equipped with a spring hydraulic cylinder, which is fixed motionless relative to the device body, and the spring cylinder rod through the eye and the rod is pivotally connected to a flat lever located in the plane of the removable slot bottom with the possibility of transmitting torque through the hexagon and the roller to the gate, while the spring is installed in the spring hydraulic cylinder with the possibility of reverse izheniya piston with a rod and turn the gate to close.

The invention is illustrated by drawings.

FIG. 1 - general view of the device;

FIG. 2 is a section AA in FIG. one;

FIG. 3 is a cross section of the BB in FIG. one;

FIG. 4 - callout B in FIG. 3;

FIG. 5 is a diagram of the use of the device in a technological installation.

A device for regulating the differential pressure comprises a housing 1 (Fig. 1, 2) with a removable bottom 2 with a blocked hole 3 (Fig. 3), a gate 4 with a through hole 5 (Fig. 2), a cover 6 with a blocked opening 7. Cover 6 and a removable bottom 2 are fixed in the housing 1 by persistent flat spring rings 8. A spacer ring 9 is installed between the cover 6 and the removable bottom 2, a slide 4 is installed mounted in the gap between the cover 6 and the removable bottom 2 of the housing 1, determined by the thickness of the spacer ring 9 the ability to transmit torque through the hex ik 10 on the roller 11, at the end of which a torque arm 12 is mounted with the possibility of transmitting torque, located in the plane of the slit of the removable bottom 2. The gaps between the housing 1, the cover 6 and the removable bottom 2 are sealed with round rings of elastomer 13, the gap between the roller 11 and the removable bottom 2 is also sealed with a round ring of elastomer 14. The set screw 15 and the pin 16 are used to fix the relative position relative to each other: the housing 1, the removable bottom 2, the cover 6 and the distance ring 9. In the sockets 17 of the removable bottom 2 and the cover 6 are installed with diametrically and axial clearances relative to the nests 17, providing the possibility of "swimming", the sealing elements 18 in the form of bushings 19 of hard antifriction material, for example of antifriction bronze or composites based on fluoropolymers. The bushings 19 are spring-loaded relative to the bottom of the sockets 17 (Fig. 4) with end hard springs 20 and are pressed by the sealing surface 21 to the gate 4. At the end of the sleeve 19, forming the sealing surface 21, grooves 22 of the labyrinth seal are made. The edges 23 of the bushings 19 have a point angle α≤60 degrees. On the diametrical surfaces of the cover 6 and the removable bottom 2 of the housing 1 in contact with the bushings 19, O-rings 24 of round cross-section are made of elastomer.

The device is equipped with a spring hydraulic cylinder 25, which is fixed stationary relative to the housing 1 of the device, and the rod 26 of the spring hydraulic cylinder 25 through the eye 27 and the rod 28, connected by an axis 29, is pivotally connected to a flat lever 12 located in the plane of the slot of the removable bottom 2 with the possibility of transmission through the hexagon 10 and a roller 11 of torque on the gate 4.

A spring 30 is installed in the spring hydraulic cylinder 25, under the action of which the piston 31 moves back with the rod 26 and the gate 4 rotates to close.

The application diagram of the device in the technological installation (Fig. 5) shows the connection of the device with the separation capacity 32 of the differential pressure sensor 33 and the hydraulic actuator 34 through the microcontroller 35.

Under the ends of the hexagon 10, support washers 36 of antifriction material are installed, which absorb the axial load from the roller 11 (Fig. 3).

The device operates as follows. The gate 4 with a flat lever 12 is rotated in the gap between the cover 6 and the removable bottom 2. The passage hole 5 of the gate 4 is combined with the overlapping holes 3 and 7 and thereby open the full passage of the working medium through the device. When turning to the other side of the gate 4, the passage hole 5 is first partially aligned with the overlapping holes 3 and 7, thereby adjusting the cross-section of the channel for the passage of the working fluid flow, providing resistance to create the necessary pressure drop of the working fluid flow in the device. With a further rotation of the gate 4, the openings 3, 7 are blocked by the blind portion of the gate 4. The device is locked. The magnitude and accuracy of the gap between the removable bottom 2, the cover 6 and the gate 4 is formed by the difference in thicknesses and tolerances of the distance ring 9 and the gate 4 and is realized when assembling the device. The size of the gap, on the one hand, should provide free movement and coordination of the position of the gate 4 in space, and on the other hand, to prevent the penetration of contaminants into the cavity of the device at transitional positions of the gate 4 between the states of the All Wheel Drive and Locked devices. The suction effect of the flow of the working medium through a partially open passage channel also prevents the penetration of contaminants into the cavity of the device. The implementation of the removable bottom 2 of the housing 1 as a separate part facilitates the processing by grinding its surface mating with the gate 4. The sleeve 19 of the sealing elements 18 with the sealing surface 21 is pressed against the gate 4 by the differential pressure of the medium on the sleeve 19 and the elastic force of the end hard springs 20.

O-rings 24 of round cross-section made of elastomer, mounted on the diametrical surfaces of the cover 6 and the removable bottom 2 of the housing 1, seal the interface with the bushings 19. The ability of the sleeve 19 to “swim” in the socket 17 provides a force of uniform pressure on the gate 4 of the sleeve 19 and its uniform grinding to the mating surface, which leads to a backlash-free fit, which guarantees reliable sealing of the mating of the gate 4 and the bushings 19. Grooves 22 of the labyrinth seal but increase the reliability of the seal.

The edges 23 of the sleeve 19 are self-sharpening and constantly remain sharp in the future when rubbing the sleeve 19 to the gate 4 due to the fact that the angle of sharpening of the edge 23 is α≤60 degrees. The acute-angled edge 23 tightly adjoins the surface of the gate 4, cleans all contaminants carried away by the flow of the working medium from the surface of the gate 4, and prevents the penetration of contaminants into the joint between the sleeve 19 and the gate 4.

When the liquid level in the adjustable separation tank 32 increases, the working fluid from the hydraulic actuator 34 is supplied to the spring hydraulic cylinder 25 under pressure, which is switched on by the command of the microcontroller 35 from the differential pressure sensor 33 to reduce the differential pressure.

In the spring hydraulic cylinder 25, under the influence of the working fluid pressure, the spring 30 is compressed and the rod 26 is extended, acting on the articulated flat lever 12, turning the gate 4 to open and increase the passage opening 5, reducing the pressure drop.

With a decrease in the differential pressure from the signal of the differential pressure sensor 33, the microcontroller 35 gives a command to the hydraulic actuator 34 to stop the flow of the working fluid and, under the influence of the compressed spring 30, the piston 31 moves back with the rod 26 and the gate 4 rotates to close, which leads to closing by the gate 4 bore 5 and maintaining the pressure drop at a set level.

When the device is withdrawn from the differential pressure control mode using the spring hydraulic cylinder 25, the gate 4 is controlled in manual mode, while the spring hydraulic cylinder 25 is taken out of operation by removing the axis 29 connecting the flat lever 12 through the rod 28 with the rod 26 of the spring hydraulic cylinder 25.

The present invention, compared with the prototype, increases the reliability, life, efficiency of the device for regulating the differential pressure and prevents the possibility of an emergency with a sharp increase in differential pressure with a sudden increase in the flow rate of the product due to the installation of a spring hydraulic cylinder as a drive gate connected with the separation tank, differential pressure sensor and hydraulic drive through a microcontroller.

The proposed device can be used to control the differential pressure when measuring the flow rate of the well as shutoff valves on production lines during transportation of natural gas and oil products.

Claims (1)

A device for controlling the differential pressure, comprising a housing with a removable bottom, a cover with holes to be blocked in them, a gate with a through hole located between the body and the cover, a flat lever located in the plane of the slot of the removable bottom with the possibility of transmitting torque through the hexagon and the roller to the gate , a spacer ring installed between the cover and the removable bottom of the housing, and in the sockets of the bottom of the housing and cover the sealing mates of the gate and cover, the gate and the bottom of the sleeve housing are made of hard antifriction of the material, at the ends of which forming sealing surfaces, labyrinth seal grooves and the edges of the bushings mating with the gate are made, have a taper angle α≤60 degrees and floating in the corresponding sockets of the bottom of the housing and the sleeve cover of hard antifriction material with labyrinth seals at the ends are spring loaded relative to the bottom of the nests from the side opposite the labyrinth seals, end hard springs and pressed thereby labyrinth sealing surfaces to the plane of the gate, and on the diameter On the surfaces of the cover and the removable bottom of the housing in contact with the bushings, O-rings of elastomer are installed, characterized in that the device is equipped with a spring hydraulic cylinder, which is fixed motionless relative to the device body, and the spring cylinder rod is pivotally connected to the flat lever through an eye and a rod, wherein the spring is installed in the spring hydraulic cylinder with the possibility of reverse movement of the piston with the rod and the rotation of the gate to close.

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