Valve for hold of ship

Abstract

A valve device for a hold is provided to prevent the inflow of seawater and to prevent the opening and closing work of a hatch cover or various kinds of works from being obstructed because the valve device is not protruded upward from the hatch cover. A valve device(1) for a hold comprises a valve box(2), a first valve body(10), a second valve body(20), a gas discharge port(3), and an outdoor air inlet port(4). When the pressure of gas guided to the valve box is a first set value, the first valve body is opened by the gas pressure. When the pressure of gas guided to the valve box is a second set value lower than the first set value, the second valve body is opened by the gas pressure. The gas discharge port discharges the gas of the valve box when the first valve body is opened. Outdoor air flows into the valve box through the outdoor air inlet port when the second valve body is opened. The valve box comprises a flange(5) attached to the side surface of a hatch cover; a communication port(5a) which communicates with the hold; and a large diameter part(23).

Description

technical field [0001] The present invention relates to a valve device for a cabin which is installed on a hatch cover for opening and closing a hatch of a cabin and controls the pressure of gas in the cabin. Background technique [0002] A ship having a hatch for loading cargo into the hold is equipped with an openable hatch cover that covers the hatch. [0003] The hatch cover is usually made of metal, and the folding and sliding types are the mainstream, but most of them fully consider the watertightness and airtightness. [0004] For example, in bulk carriers such as grains, the ingress of water through the hatch covers has a significant impact on the loaded cargo. Therefore, a function of reliably maintaining the watertightness and airtightness of the hatch covers is required. [0005] In such ships, for the purpose of lowering the waterline when the ship is empty, work is performed to inject seawater into the ballast tanks or to discharge seawater in the ballast tanks...

AI Technical Summary

Problems solved by technology

[0012] However, like a bulk carrier such as grain, the seawater in the ballast tank that is filled with water during a storm is discharged after the weather recovers, but there is a problem in that it is necessary to keep the ventilator of the ballast tank closed. During this operation, the inside of the ballast tank becomes negative pressure, and the hatch cover bends and deforms toward the inside of the ballast tank.

[0016] In the method of installing a vacuum valve that automatically opens and closes on the hatch cover, since the position of the vacuum valve is higher than the deck, it seems to be effective in preventing the ingress of seawater. However, the vacuum valve itself is placed on the hatch cover. Since it protrudes greatly, it causes problems that hinder various operations.

[0017] In addition, when the hatch cover is foldable or sliding as described above, there is also a problem that the vacuum valve itself becomes an obstacle when the hatch cover is opened or closed, or smooth opening and closing operations cannot be performed.

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