Analysis of Floating Ball Exhaust Valve Structure by PTFE lined Valve Merchants

PTFE lined valve Merchant analysis of floating ball exhaust valve structure construction

The floating ball exhaust valve has a floating ball on the casing inside its valve body. When there is no water in the valve body, the floating ball falls into the casing, and the exhaust port opens for exhaust. When there is water, the floating ball floats up and blocks the exhaust port, blocking the water flow. This type of exhaust valve has a simple structure,

But there are the following technical defects:

1> When the water and gas phases are alternating, the large exhaust port can only discharge the gas section and cannot continuously exhaust. clamp-on Fluorine-lined Butterfly Valve When the slope of the water pipeline is not large, check valve In most pipelines, there is a slug flow state of one section of water and one section of gas. The buoyancy of the floating ball exhaust valve is only a few kilograms. After the gas is exhausted, the water lifts the floating ball, and the second section of gas has pressure. Assuming the pressure is 0.2 PMa, the gas's support force on the floating ball is equal to the exhaust port area multiplied by the pressure inside the pipeline. The calculated support force for the DN100 exhaust valve is about 150 kg, and the support force for the DN300 exhaust valve is about 1400 kg. Therefore, the large exhaust port cannot automatically open the exhaust and lose its exhaust function in the slug flow state.

2> Small exhaust ports generally have a diameter of 3-5mm and can only provide minimal exhaust. If the performance of the large exhaust port is poor, relying solely on micro hole exhaust is extremely dangerous for large diameter water pipes.

3> If the float does not move for a long time during operation, it is prone to failure due to sticking.

Cylinder exhaust valve is a type of valve that uses a float lever to control the action of the pneumatic diaphragm inside the cylinder, thereby opening and closing the large and small exhaust ports on the valve body, Fluorine lined DC globe valve It is a full pressure high-speed exhaust valve. Under any pressure and water flow state, as long as the gas in the pipeline enters the exhaust valve, the exhaust valve will open the large and small exhaust ports to exhaust. When water enters the exhaust valve, the large and small exhaust ports are closed and there is no water leakage. Or in other words, the valve can achieve high-speed discharge upon seeing air and close upon seeing water, and can continuously discharge a large amount of air multiple times. The main characteristics of this type of exhaust valve structure are: the effective exhaust diameter of the large or small exhaust port or only the large exhaust port is not less than 70% to 80% of the nominal diameter of the exhaust valve, the exhaust diameter is large, the exhaust speed is fast, and high-speed exhaust can be achieved in any situation.

Generally, designers calculate the exhaust volume based on the nominal diameter of the exhaust valve when selecting it. Cylinder type exhaust valves can meet design requirements and truly prevent water hammer and pipe bursting in pipelines.

The article is written by Fluorine lined valve factory Provided, please indicate when reprinting http://www.lierduofm.com/