Safety discharge valve

Abstract

A safety discharge valve includes a siphon-type open / close device (1), a valve cover assembly (2), a valve rod (3), a valve body (4), an extensible side-sealing top-pressing assembly (5), side rotary sealing plates (6), a tapered bottom valve plug (7) and a side water inlet emergency plug (10).

Description

technical field [0001] The invention relates to a valve, in particular to a safety discharge valve used in ballast water tanks of submarines and oil platforms. Background technique [0002] The applicant disclosed a bilge valve in 2005, the application number is 200510045517.3, the disadvantages of this valve in practical application are: [0003] 1. The middle section of the valve stem and the upper section of the valve stem are exposed to the seawater in the cabin when the valve is open. Due to the erosion of marine microorganisms, the shellfish biosorption accumulates and proliferates, causing serious opening and closing failures, or even failure to open and close. At the same time, due to the bottom valve port and side valve The mouth is closed and sealed at the same time, seawater remains in the valve cavity, and shellfish in the seawater are biosorbed on the valve stem and other internal parts of the valve, resulting in failure to open and close. [0004] 2. The valve...

AI Technical Summary

Problems solved by technology

[0004] 2. The valve plate is opened or closed by sliding up and down in the guide groove. Since the valve stem, the tensioner, the valve plate and the guide plate are all linked by pin sleeves, when the valve stem is lifted up, any node of the linkage structure If the valve is stuck or damaged, the valve cannot be closed. Similarly, when the valve needs to be opened in the closed state, the valve cannot be closed because any node of the pin-sleeve linkage structure is stuck or damaged.

[0005] 3. When the valve needs to be closed under the open working condition, the bottom valve disc and the side valve plate cannot be closed automatically when the drive mechanism switch indication fails, the connection between the valve and the drive is disconnected, disconnected, etc., or the closing is not in place due to human error. When the check is closed, seawater enters the valve cavity through the bottom valve port and pours into the cabin through the side valve port, endangering the safety of the submarine or platform;

[0006] 4. When the valve needs to be closed, if there is a foreign object between the side valve plate and the side water inlet to support the jamming fault and cannot be closed, due to the linkage structure of the valve stem, the expander and the side valve plate, the valve stem cannot go down, and the bottom valve disc It cannot be closed with the bottom port of the valve, and seawater will pour into the cabin, causing major marine hazards;

[0007] 5. When the valve needs to be closed, if there is a foreign object between the bottom disc and the bottom outlet, the valve stem cannot move down to drive the bottom disc to close the bottom outlet. It is also impossible to close the side water inlet downwards. Seawater enters the valve cavity through the bottom valve port and pours into the cabin through the side valve port, endangering the safety of the submarine or platform;

[0008] 6. When the space between the bottom disc and the bottom water outlet, and between the side valve plate and the side water inlet are blocked by foreign objects and cannot be closed at the same time, the bottom water outlet or the side water inlet channel has no emergency blocking device to block the backflow of sea water. The tank will make the ballast unbalanced, and the maritime accident of the capsizing of the oil platform is inevitable;

[0009] 7. When the valve bottom and the bottom disc are damaged by marine impact, the valve stem will be twisted and deformed. Due to the linkage of the structure, the seal between the side valve plate and the side water inlet will also fail to prevent seawater from pouring into the cabin.

[0010] The fatal defect that the above-mentioned prior art scheme exists still does not have the technical scheme that solves at present

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