SU1222955A1 - Hydraulic back-pressure valve - Google Patents

Description

The invention relates to reinforcement and can be used, for example, in shipbuilding as a means of automatically preventing the backflow of petroleum product vapors from cargo tanks under pressure into engine rooms or other fireproof rooms in which inert gas supply installations are located.

The purpose of the invention is to increase reliability, simplify the design and reduce energy consumption by providing a more reliable automatic dry operation during the gas supply period, independent of the plant capacity.

FIG. 1 shows the shutter, a general view; in fig. 2 - the same plan view; in fig. 3 shows the closure from the side of control devices, a general view, in FIG. 4-principle circuit of the shutter when the inert gas installation is turned off; in FIG. 5-principle circuit of the shutter in the mode of gas supply.

The valve is a tank consisting of a rectangular shaped body 1 with a base frame 2. For connecting to the gas pipeline, pipes 3 are provided for supplying and discharging 4 gases. The container is divided into two chambers: the top one is gas 5 and the bottom one is liquid 6. The cylindrical part of the gas chamber 5 is the cup 7 together with the inner end of the nozzle 3 and the gases are lowered into the liquid chamber 6. At the bottom of the cup 7 there is a reflector 8 on top of which is located 9 dehumidification chamber. Between the wall of the cup 7 and the reflector 8 there is an annular opening 10. The fluid chamber 6 is divided into two parts: an inlet with a water inlet and a valve 11 and a drainage with a nozzle 12 of the outlet. Water is poured from one part to another through a partition 13, the height of which is determined by the operating level of the shutter. The hydraulic shutter has a rotary dehumidifier rotating around the axis 14 and consisting of a rotary damper 15 that blocks the gas chamber 5 and counterweight. Osuschitel 16, located on the side of the liquid chamber 6, rigidly interconnected. The shutter is also equipped with a movable type drain device, which by means of

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flexible pipe 17 communicates the inlet of the fluid chamber 6 with the pipe 12 of the fluid outlet. The end of the flexible pipe 17, where the drain hole 18 is located, is attached to the rotator. The mount is made at a distance from the axis 14 by means of a bracket 19. In order to avoid freezing of water, the liquid chamber 6 of the shutter has a steam coil 20. For monitoring and inspecting the state of the shutter during operation, viewing glasses 21 and throat 22 are provided on the body 1. and fluid temperature is produced using an index column 23 and remote alarm sensors: the upper 24 and lower 25 levels and the temperature 26.

The shutter works as follows.

When the inert gas installation is turned off, when there is no gas passing through the gate, the gas path automatically closes by filling the drying chamber 9 with water (Fig. 4). In this case, due to the overpressure maintained in cargo tanks, the water level in the inlet 3 will be superior to the level of the liquid chamber 6 by the amount of overpressure. In the liquid chamber 6, in this position, an operating level is set equal to the height of the baffle 13 of its drainage part. This is due to the position of the rotating device, which, under the action of gravitational forces, is in a vertical position, and the end of the flexible pipe 17 with the drain hole 18 attached to the rotating device is at the top point above the working level.

The water layer installed in this case in the locking device creates a reliable barrier to the backflow of gases.

At the moment when the supply of gases begins, the dynamic pressure displaces the liquid from the drying chamber 9 and at the same time the rotator will move to the horizontal position (Fig. 5). In result 5 of this, the volumetric counter-drier 16 will exit the liquid and the water level in the closure will decrease. Then the liquid in the drying chamber 9 is col.

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The vent hole 10 will flow under the reflector 8, the gas path will be completely freed from the liquid and the gases will be supplied to the cargo tanks in a dry way, without contact with the liquid. Simultaneously with moving the rotator to a horizontal position, the end of the flexible pipe 17 with a drain hole 18 attached to it will fall down. Due to this, the water will be drained to a minimum. The selection of the optimal values of the volume of the counterweight drier 16, the width of the annular hole

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10 and the diameter of the flexible pipe 17, the decrease in the level of the gate can be carried out almost instantly.

When you stop the supply of gas rotator under the action. The gravitational forces of the counterbalance drier 16 will return to their original position. Then the volumetric anti-dryer 16, immersed in water, raises the water level in the gate. Together with the pivoting device, it will raise: the flexible pipe 17, the drain hole 18 will be at the top, and the operating level will be maintained in the gate.

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Claims (2)

1. HYDRAULIC SHUT-OFF, comprising a housing consisting of gas and liquid chambers with nozzles for supplying and discharging gases and liquids, a shut-off device for gas flow and an automatic drainage device in the gas flow mode, characterized in that, in order to increase its reliability in operation to simplify the design and reduce energy consumption, the drainage device is made in the form of a rotary damper installed in the gas chamber, and a rotary submersible counter-dryer installed in the liquid chamber, and rotary shutters and counterbalance dryer are rigidly interconnected and fixed on the same axis. 2. Shutter pop. 1, characterized in that the counter-dryer is made with a remote bracket, at the end of which is attached _{with a} flexible pipe connected with sweat. 1S with a fluid chamber and a fluid outlet. SU "., 1222955