Questions You Should Know about float valve for cooling tower

The mechanical float valve that EVAPCO uses operates with a makeup water pressure between 20 and 50 psi.  When the makeup water pressure exceeds the 50-psi limit, the makeup valve will not close.  The reason for this is that the buoyant force of the float ball and arm mechanism cannot overcome the force that the water pressure exerts on the valve.  Therefore, when the water pressure force is greater than the buoyant force, the float ball is forced down and the valve stays open flooding the cold water basin.  In addition, the excessively high water pressure will wear out the valve seat. 

For more information, please visit float valve for cooling tower.

The solution to this problem is to simply add a pressure reducing valve (PRV) to lower the makeup water pressure to below 50 psi.  Keeping the makeup water pressure to the cooling tower between 20 and 50 psi will ensure adequate operation of the mechanical float valve. 

For additional troubleshooting assistance, please contact your local EVAPCO sales representative.

Float switches are used for determining the liquid level inside of a tank. The switch could be found in a water storage tank, pump, indicator, low or high alarm, or various other devices.

A float switch can range in size, a simple mercury switch within a hinged float or a complicated system of conductance or optical sensors that produce the output data as liquid levels increase inside the tank.The most common form of a float switch may be a simple float that activates a rod when raised, activating a microswitch.

Float Switch Applications

Sump pumps contain common applications, as well as condensate pumps as switches determine an increase in water level in the tank or sump, energizing the pump to begin pumping out the liquid until it is back to a lower level. Then, the pump will switch off again. Also, float switches can be adjustable while including substantial hysteresis. This determines when the switch will turn on, which can be much higher than the turn off level to lower the pump’s on and off cycle.

There are float switches that have a two stage process. When liquid levels increase, the first stage is triggered where the pump gets activated. When water level continues to increase (in the even a pump ails, or blocked), a second stage gets triggered. The second stage could trigger alarms, or turn off the source of liquid, some do both.

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New Float Switches, What Are They? How Do They Work?

New float switches are referred to as water level controls or may be called water level switches, this is due to many of them no longer floating. Instead, they use probes for determining the water level by sensors rather than floats, and can be used in various storage tanks, such as oil, gas, water, etc.

The sensor probes are a self-efficient method that does not pass electric to probes which aids in them lasting longer, as it avoids deteriorating, fouling and degrading. The electronics are designed within the head so it can be connected straight to the control panel. When water levels are detected with a sensor, it will set off one of six alarms, including Fill Start, Fill Stop, Low Alarm, High Alarm, etc. A single or multiple point alarm gets triggered depending on your type of switch.

Various alarms help control the different start and stop mechanisms. For instance, triggered low alarms can do one of two things, and some setups do both.

Working Principle of New Float Switches

Generally, a float switch or water level control will begin in a closed position. This means no alarms are triggered due to the water being at the predetermined level.

1. When cooling towers begin to use water for an industrial process, water levels begin to drop. This would not trigger any alarms.
2. When water levels drop under the probes, conductive signals are sent from probe to trigger the low alarm.
3. Triggered low alarms can then be programmed to start filling to increase water level.
4. When water is at the predetermined level again, a fill stop is activated and the process resets.

When cooling tower float switches are properly maintained, they are able to last for many years. The majority of float switches fail due to deteriorating, degrading or fouling. Also, a cooling tower coating is able to add extra protection to your storage tank, but what protects the float switches?

Float Switch & Valve Supply

If your cooling tower needs a new float switch or float valve Universal Tower Parts has everything you need to help monitor and regulate the liquid used in your cooling towers.  We offer various designs so we are sure to be able to find an excellent solution for any of your float switch needs.  Give us a call today with any questions you might have or to order.

If you are interested in purchasing float switches or valve supplies in  Phoenix or anywhere else in the Valley call us today at 602-997-0403.

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