Types of Float Valves / Ballcock Valve
Different types of ballcock/float valves are available in market based on fitting orientation,use,working principle,size etc.
Horizontal and Vertical float Valves
Vertical Float Valve
Here the float is oriented and moves in vertical direction as shown in figure. The float is directly or indirectly act on the valve seat for closing and opening the valve. The force of buoyancy is directly acting on the seating area. The buoyancy force should be higher than the effective force due to inlet pressure for fully closing requirement of valve, So the float size is depends on the inlet pipe pressure,the more the inlet pressure higher the float size required. Vertical float valves are most suited in deep tanks/sumps where the horizontal spacing is limited mainly in industrial application like oil and chemical industry tanks for automatic shut off/filling operation.
Horizontal Float Valve
Horizontal float valve is works based on the principle of force of buoyancy and principle of lever and fulcrum. As shown in figure below. Float arm acts as a lever and pivoted on body act as a fulcrum. The buoyancy force exerted on the float is transferred to the valve seating by the lever which gives more effective force on valve seating, so the more lengthier the float arm, smaller the required float size.