Constant velocity buffering exhaust valve

Abstract

The invention relates to a constant-speed buffer discharge valve, which comprises a lower valve body, middle valve body, float rod, small valve pin, cover plate, lower slide rod, upper slide rod, compress sensitive spring, film, and valve cover, wherein the float is hinged with one end of float rod; the float rod via the axle of middle valve body is hinged to the middle valve body; the float is inside the protective cylinder inside the lower valve body; the cover plate is connected to the lower sliding rod; the upper sliding rod, the film lower compress rod, the film and the film upper compress plate are integrated, to form control element with the compress sensitive spring; the film is compressed via valve cover on the middle valve body; the tube via current-limit connector is through to the inner chamber of hydraulic cylinder on the middle valve body and the valve cover; the small discharge cap is screwed on the middle valve. The invention is characterized in that: it uses float lever to control the switch of large gas outlet, whose open degree changes along the pressure of tube, to realize full-automatic stable-pressure ventilation.

Description

technical field [0001] The invention relates to a pipeline exhaust and water hammer protection device, in particular to a constant-speed buffer exhaust valve generally used on water supply pipelines. Background technique [0002] Existing exhaust valves are divided into three types. That is, the full-pressure high-speed exhaust valve, single-port exhaust valve, high-speed exhaust valve and the combination of these two valves are called double-port exhaust valves. The exhaust valve is generally installed on the pressured water supply pipeline buried underground. The function is to discharge the gas in the pipeline to prevent the pipeline from bursting. [0003] In order to discharge gas under any conditions, the exhaust port of a single-port exhaust valve is generally very small, which cannot meet the needs of a large pipeline for large-scale exhaust. Its working principle is that when the gas in the main pipeline enters the exhaust valve, the floating ball loses its buoyan...

AI Technical Summary

Problems solved by technology

Its characteristics are: when the gas in the pipeline enters the exhaust valve, the buoy hanging on one end of the buoy rod in the valve body loses buoyancy and falls, causing the small valve core at the other end of the buoy rod to rise, open the small valve port, and close the small exhaust The exhaust port on the cap allows the gas to enter the hydraulic cylinder through the conduit, and the diaphragm assembly in the hydraulic cylinder is affected by the air pressure to open the cover plate on the large exhaust port on the valve body to achieve high-speed exhaust, and when water enters the exhaust valve After the body, the buoy rises, the small valve core descends, the small valve port is closed, and the exhaust port on the exhaust cap is opened at the same time, so that the hydraulic cylinder can be directly connected to the atmosphere through the conduit and the exhaust port on the exhaust cap, the diaphragm loses pressure, and the large The cover plate on the exhaust port is closed under the action of the water pressure of the pipeline, and the large exhaust port blocks the water flow, realizing the goal of opening the large exhaust port to exhaust when there is gas in the exhaust valve body, and closing when there is water. Although the valve solves the problem of poor pipeline exhaust, it also has technical defects that when the pipeline pressure is high, the exhaust speed is too fast, and when the exhaust is completed, the valve is closed and the water hammer boosts the pressure too high, which may cause the pipeline to burst.

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