![]() ![]() Main valves are usually operated from system pressure but if it is insufficient to actuate the valve, auxiliary hydraulic or pneumatic actuation is added. ![]() ![]() The float rides the rod between low water and high water stops allowing for the tank to empty somewhat between actuation of the main valve. Weighted chains are sometimes used as well. Such systems are often fitted with vertical rods attached to the floats to extend the reach into deep tanks. Such valves can be on/off or modulating, depending on the system requirements. When faster fill rates beyond what the float valve produces are necessary, or where a main valve is fitted outside and near the bottom of the tank, the float valve can serve as a pilot valve, providing a control “signal” of fluid to the main valve. These systems often couple a valve mounted on the outside of the tank with the ball mechanism at the top of the tank through a linking rod. Some direct-acting valves offer dual functions that can top up a tank at different rates depending on demand.ĭirect-acting valves sometimes use trunnion mounts to scale down the large movement of the float to the smaller movement needed to open and close the valve.įloat valves are also used for drainage control where the rise of the float detects high fluid level and directly opens an outlet, or dump, valve. The float diameter and lever arm may be varied to provide sufficient closing force depending on the system pressure. Old-style toilet fill valves typify this setup. These are controlled through the rising and lowering float via a lever, producing a mechanical advantage that holds the valve shut. Direct-acting valves typically use cylindrical slides or diaphragms for their inlet control/shut-off. Valve designįloat valves can be direct-acting, such as those used in toilet tanks, or, in some industrial incarnations, used as pilot valves to direct the operation of larger control valves. For information on other valves, please see our Valves Buyers Guide. Float valves are employed to create completely mechanical level control systems. The ball, or “float,” rides on, near, or beneath the surface of the fluid and its up and down motion is transferred mechanically to the valve, opening it or closing it, depending on the position of the float with respect to the tank. In addition to the valve body, a typical float valve has a spherical or similarly shaped hollow ball attached to the valve through a lever or arm. Image credit: Yuthtana artkla/įloat valves, or ballcocks, are used to regulate fluid levels in tanks. Float valves regulate the fluid level in a tank. ![]()
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