SU724871A2 - Apparatus for protecting pipelines from hydraulic impacts - Google Patents

Description

one

The invention can be used in valve industry.

According to the main author. St. No. 464751, a device for protecting pipelines from hydraulic shocks is known.

The proposed device for protection of pipelines against hydraulic shocks differs from that known in that a control stop in the cylinder is displaceable, made in the form of a knob with an external thread, and the cylinder is provided with an internal thread interacting with the external thread of the stop.

In such an embodiment, the device protects the pipelines against smooth increases in pressure, which makes the application area less clear.

The drawing shows the proposed device for protection of pipelines from hydraulic shocks. It contains a buffer tank 1, inside which is filled with a control medium, such as oil, elastic chamber 2, forming a closed system, with an actuating device. The latter is made in the form of a cylinder 3 with a plunger pair consisting of a piston 4, which receives pressure from the control medium, and a rod 5. Inside the cylinder 3 there is an adjustable stop 6, which is movable along a generator. The adjustable stop 6 is made in the form of a washer having an external thread and a central hole larger than the diameter of the rod 5. The cylinder in the lower part has an internal thread along which the stop 6 is screwed to the required depth 6. There are holes for a special key for fixing the door from turning with oil paint (a locknut can also be used for this purpose).

The piston 4 through the rod 5, the cup 7, the spring 8 and the rod 9 is connected to the relief valve 10, which closes the saddle I. The supply device through a one-way throttle 12 is connected by means of the sleeve 13 to the media separator 14. The proposed device is connected to the pipeline to be protected through valves, which are mounted on the connecting flanges 15 and 16. To put the device into operation, it is necessary first to open the valve under the media separator 14, if the protected pipeline is not filled with the transported medium, then the order from ryti valves is not critical.

The device works as follows.

When the valve is opened, the iodine separator of the medium 14 transports the medium into its internal cavity and compresses the control medium, which in the sleeve 13 flows into the chamber 2 and moves the piston 4 down. The piston 4 through the cup 7, the spring 8 and the rod 9 presses the waste valve: Пю 10 to the element P. Further, the valve 10 continues to remain closed and compacted, since the area of the piston 4 is larger than the area of the bore hole in the saddle 11.

With a sharp increase in pressure in the protected pipeline, the control medium, flowing into chamber 2 through the opening in one-way throttle 12, does not have time to leak in such a quantity as to compress the spring 8 to a force equal to the pressure force of the working medium on the discharge valve 10. It therefore opens, providing hydraulic shock absorption in the pipeline. As the control medium leaks into the chamber 2, the piston-spring system — the valve goes down and the valve closes.

With slow pressure rises (this is typical, for example, with hydraulic shocks on long pipelines caused by the high inertia pump assembly shutting down), the pressure almost simultaneously changes in chamber 2 above piston 4 and under the relief valve 10. The latter is in the closed position until until the pressure reaches the maximum permissible value, which is preceded by the moment of contact of the adjustable stop 6 by the piston 4. Since the force transmitted by the spring 8 to the rod 9 does not increase further, the pressure increase or under the valve 10 leads to its opening. The discharge of the transported medium begins, and the pressure increase in the pipeline to be protected stops.

If the hydraulic impact in the pipeline began with a pressure drop, then

during the reduction of the pressure of the transported medium and, accordingly, of the control medium in the separator 14 and the sleeve 13 by the force of the previously compressed spring 8 to the piston 4, the control medium, while opening the valve of the one-way throttle 12, flows from the chamber 2 to the separator of the medium 14. Spring 8 unclenched to a force corresponding to the minimum

pressure in chamber 2, which decreases to the minimum pressure in the pipeline to be protected. With a subsequent increase in pressure, the device operates as previously described.

The presence of an adjustable stop restricting piston movement allows the device to limit the maximum possible pressure increases in the pipeline to be protected. This in some cases will allow the device to expand its application area (for long pipelines), in others it will be rejected to use safety valves in parallel (for example, on systems with piston pumps). In any conditions, the use of the proposed device increases the reliability of the protected pipelines.

Claims (1)

Invention Formula Device for protection of pipelines against hydraulic shocks St. JMb 464751, characterized in that, in order to expand the field of application, an adjustable stop made in the form of a washer with an external thread is disposed in the cylinder, and the cylinder is provided with an internal thread interacting with the external thread of the stop. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 464751, cl. F 16K 47/00, 1970.