Automatic emergency shutdown of the pipeline if it is damaged

 

(57) Abstract:

The invention relates to a valve and can be used for the transportation of gases by pipelines. Automatic emergency shutdown of the pipeline solves the problem of increasing the safe operation of pipelines and reduce gas losses with their injuries. When in operational mode, the pressure in the pipeline is changed from low speed. The distribution valve 16 by a spring 23 is drawn in to the body 1, and the liquid 3 flows through the annular channel 29 of the throttle device between the cavity 25 and the tank 2 without creating a differential pressure on the piston 12 of the hydraulic dampers. When the damage to the gas pressure therein begins to decline sharply. The hydraulic resistance of the annular channel 29 prevents rapid movement of the piston 12 and to reduce the force of the spring 14, which moves down the plate 15 with the distribution valve 16. The latter breaks the membrane 18, and opens up access gas from the cavity 20 in the flange 19 to the outlet chamber 22 and cavity control stop valve on the gas pipeline. A stop valve is closed by turning off the damaged area. A distinctive feature of the machine is that throttle calcev the creation of a processing machine at the same rate of pressure drop in the pipeline in winter and summer. The rate of pressure drop, which must operate the machine, can be tuned by adjusting the length of the throttle channel. C.p. f-crystals, 5 Il.

The invention relates to a valve and can be used for the transportation of gases by pipelines.

Known machines for emergency shutdown of the pipeline if it is damaged, which includes a distribution device for drive control stop valve on the gas line and the sensors are responsive to changes in the rate of fall of pressure containing cylinders associated with the gas pipeline through the holes of small cross section (see the prospectus of the company Samego and Andreev, A. Shutoff valves. Leningrad: Nedra, 1974, S. 171).

There are also known machines emergency shutdown of the pipeline if it is damaged, containing switchgear, reacting to changes in the velocity of the gas stream (see, for example ABT. St. USSR N 189271, CL F 16 K 17/34, 1961).

The main disadvantage of these structures is the presence of holes of small cross section for the flow pumped by pipeline gas, which in operational terms clogged liquid or mechanical impurities present in the gas, which leads to nasrabadi who is improving the reliability of the machine. Expected from the use of the effect is as follows. First, the distribution valve provides the passage to the actuator of the locking member only upon rupture of the membrane, which prevents leakage of gas to the actuator of the locking member on the pipeline. Secondly, the throttle device for hydraulic dampers allows you to ensure stable operation of the machine at different ambient temperatures. Thirdly, there is the possibility of opening the tubes to a throttle device for adjusting the length of the annular channel that allows you to adjust the boundary of the rate of pressure drop at the desired value. Fourth, install the piston return valve ensures that when connecting the machine to the gas quick installation into position and secure fill the machine nonfreezing liquid. Fifthly, use one of the tareley for the spring as the piston of the hydraulic dampers greatly simplifies the design and improves the manufacturability of the machine.

The invention consists in that the machine containing the dispenser is installed in the valve body, the first and second control chambers connected to the pipeline, which has thornylee spring of the first piston, fitted in the lower end of the body at the upper end of which has a second piston associated with placed in the bore of the housing with a piston of hydraulic dampers, spring-loaded, connected via a plate with the first piston, and a reservoir filled with a nonfreezing liquid and coupled with podpornoy cavity hydraulic dampers, nadporshnevaya cavity which is connected to the tank through the throttle annular channel of small cross section, formed reinforced on the bottom of the tank upper and lower disks, between which is located the inner disk thickness equal to the height of the throttle annular channel made of a material with a coefficient of linear expansion greater coefficient of linear expansion of the material of the upper and lower disks, moreover, the larger and the smaller diameters of the throttle ring channel is limited, respectively, the lower and inner disks, and its cavity communicates with the tank through openings in the upper disk, close the tubes with the possibility of changing the length of the flow part throttle annular channel. While the first and second control chambers respectively formed under the bottom end of the first and above the upper end face of the second piston, and the output chamber is formed about ARCOM, the first piston is supported on a thin metal membrane, sandwiched between the lower end of the body and mounted on the end flange with the provision of rupture of the membrane at the bottom position of the piston.

Automatic emergency shutdown of the pipeline shown in Fig. 1; Fig. 2-5 depicts the throttle device of hydraulic dampers.

The machine is assembled in the cylindrical housing 1, a closed top cover 2, combined with a reservoir, which flooded the nonfreezing liquid 3. In the bore of the center of the cover 2 (tank) pressed Buchs 4 inside of the piston 5 with the sealing ring 6. The cavity 7 above the piston 5 through the flange 8 is connected to the pipeline. The tank is closed by a cover 9. The force on the piston 5, the pressure of the gas in the pipeline is transmitted by a rod 10, which is located in the bore of the cover 2 with the sealing ring 11, the piston 12, is placed in the internal bore of the housing 1. The gap between the housing 1 and the piston 12 is sealed with a ring 13. Spring 14 mounted under the piston 12, perceives the force transmitted from the piston 5. The lower end of the spring 14 supported on the plate 15, propped up by the distribution valve 16 located in the bore of the housing 1, condensed rings 17. The bottom end of the spool 16 having the same diameter, and then the 20 which is also connected to the pipeline, as the cavity 7, the pipeline 21. To the distribution valve 16 connected to the output chamber 22, soamsawali driven stop valve installed in the pipeline. The distribution valve 16 is pressed against the plate 15 additional spring 23. The cavity 24 below the piston 12 and the cavity 25 above the piston 12 is filled nonfreezing liquid. The cavity 24 is communicated with a reservoir in the lid 2 by a pipe 26. The piston 12 is integrated non-return valve 27 to allow the free flow of liquid filled from the cavity 24 in the cavity 25. The flow of fluid from the cavity 25 in the tank through the opening 28 in the cover 2 and through the throttling device. The throttle device is made in the form of an annular channel 29 small section formed by the upper 30 and lower 31 discs, between which enclosed the inner disk 32. The upper 30 and lower 31 discs made of a material having a smaller linear expansion coefficient than the inner disk 32. The gaps between the disks condensed rings 33 and 34. The fluid from the holes 28 flows into the hole 35 in the lower disk 31 with a sealing ring 36. It then passes through the annular channel 29 of small cross section and flows into the tank through the opening 37 in the upper disk 30. Holes 35 and 37 separated by a short resident who claim 32 and provides jamming in the channel 29 harness 38. The release of liquid from the channel 29 in the tank can be carried out not only at the end of the channel 29 through the opening 37, and previously through the hole 40 provided that the removal of the tube 41. Holes such as hole 40 located along the channel 29, you can adjust the length of the throttle channel. Mount the throttle device at the bottom of the tank is performed by the screws 42.

When in operational mode, the pressure in the pipeline is changed from low speed. The distribution valve 16 by a spring 23 is drawn in to the body 1, and the liquid 3 flows through the annular channel 29 of the throttle device in the tank without creating a differential pressure on the piston 12 of the damper. When the damage to the gas pressure therein begins to fall sharply. The hydraulic resistance of the annular channel 29 prevents rapid movement down the plate 15 with the distribution valve 16. The latter breaks the membrane 18 on which it is based, and open access gas from the cavity 20 in the flange 19 to the outlet chamber 22 and cavity control stop valve on the gas pipeline. A stop valve is closed.

1. AUTOMATIC EMERGENCY SHUTDOWN of the PIPELINE IF IT is DAMAGED, containing the dispenser is installed in the Cabinet zolotnikovskoy drive, the control cavity which is connected to the output chamber, wherein the valve is made in the form of a spring-loaded first piston fitted in the lower end of the body, on the top end which has a second piston associated with placed in the bore of the housing with a piston of hydraulic dampers, spring-loaded, linked through the plate with the first piston, and a reservoir filled with a nonfreezing liquid and coupled with podpornoy cavity hydraulic dampers, nadporshnevaya cavity which is connected to the tank through the throttle annular channel of small cross section, formed reinforced on the bottom of the tank upper and lower disks, between which is located the inner disk thickness, equal to the height of the throttle annular channel made of a material with a coefficient of linear expansion greater coefficient of linear expansion of the material of the upper and lower disks, the greater and lesser diameters throttle annular channel is limited to the lower inner rims, and its cavity communicates with the tank through the holes in the upper disc, sealed tubes, with the possibility of changing the length of the flow part throttle annular channel, while the first and second opravlyaushi, and the output chamber is formed by the opening in the lower end of the body, United in the lower position of the first piston with a cavity beneath its bottom end.

2. Machine under item 1, characterized in that the first piston is supported on a thin metal membrane, sandwiched between the lower end of the body and mounted on the end flange with the provision of rupture of this membrane in the lower position of the first piston.

 

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