What is Float Ball Valve and its Working Principle?

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What is Float Ball Valve and its Working Principle?

What is Float Ball Valve and its Working Principle?

Apr 27, 2021

Float ball valve is a kind of valve composed of crank arm and float ball, which can be used to automatically control the liquid level of water tower or pool. It has the characteristics of simple maintenance, flexible and durable, high accuracy of liquid level control, water level not disturbed by water pressure, and tight opening and closing without water leakage.

The ball of the float ball valve has no supporting shaft, and the ball is clamped by two valve seats, which is in a "floating" state. It is mainly used to cut off, distribute and change the flow direction of the medium in the pipeline. Float ball valve mainly has seat sealing design, reliable inverted sealing valve sealing rod, fire and static function, automatic pressure relief and locking device and other structural features.

Float ball valve is suitable for chemical, petroleum, natural gas, metallurgy and other industries, as well as long-distance natural gas pipeline with hydrogen sulfide medium, many impurities and serious corrosion.

The main structural features of float ball valve are as follows:

1. The valve is equipped with open and close position indication;

2. Locking device;

3. Anti flying structure of valve stem;

4. Anti static device;

5. Fire protection structure;

6. Unique valve seat sealing structure;

7. The middle flange (connecting part of valve body and left body) has no leakage structure.

According to different requirements, floating ball valve is divided into ordinary carbon steel series (WCB & A105) based on shell material; Stainless steel series (304316); Low temperature steel series (LCB, LCC); Sulfur resistant series, etc.

Float ball valve is suitable for general industrial use.

Working principle of float ball valve:

Floats always float on the water. When the water surface rises, floats also rise. When the float rises, the connecting rod will also rise. The connecting rod is connected with the valve at the other end. When it rises to a certain position, the connecting rod supports the rubber piston pad to close the water source. When the water level drops, the float also drops, and the connecting rod drives the piston pad to open.

The float ball valve regulates the liquid supply by controlling the liquid level. The full liquid evaporator requires a certain height of liquid level, which is generally suitable for the use of floating ball expansion valve. The working principle of floating ball valve is to control the opening or closing of a valve by reducing and increasing the floating ball in the floating ball chamber under the action of liquid level. The floating ball chamber is placed on one side of the full liquid evaporator, and the upper and lower parts are connected with the evaporator by the balance tube, so the liquid level height of the two is the same. When the liquid level in the evaporator drops, the liquid level in the floating ball chamber also drops, so the floating ball drops. Depending on the lever action, the opening degree of the valve increases and the liquid supply volume increases. vice versa.