WLHL

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WLHL (Water Level High Limit) are most commonly used in residential water heaters, water softeners and other water pressure applications. They are designed to stop water flow during low pressure events that can occur when water pressure drops below a predetermined limit. The WLHL will open as the water pressure drops, allowing the flow to resume when the pressure returns to the predetermined limit.

Although the design varies slightly between different manufacturers, the basic components remain the same. Typically, the WLHL consists of a pressure switch, a tube/pipe connection, a pressure gauge/meter, check valves, an adjustable pressure regulator, and a mounting bracket.

The pressure switch is the most important part of the WLHL, as it is responsible for detecting the pressure at the low level and shutting off the flow of water. This switch is activated when the pressure on the output side of the pressure switch falls below a setpoint, such as 15psi. When this happens, the switch opens and the flow of water stops.

The tube/pipe connection is used to connect the pressure switch to the water pipe or to the pressure chamber of a water heater. This helps to ensure that the switch is able to detect the pressure accurately and to prevent contamination of the water supply. If the connection isn’t tight, there is a risk that air or dirt could enter the system, resulting in a faulty reading.

The pressure gauge/meter is used to monitor the water pressure at the low level and to reset the WLHL after the pressure drops. This helps to ensure that the system is properly regulated to protect against low pressure events.

The check valves are used to help limit the amount of water that can flow back into the pressure chamber once the pressure switch has been activated. They also help to prevent contamination of the water supply by preventing contaminants from entering the system from downstream.

The adjustable pressure regulator is used to adjust the pressure setpoint and to ensure that the WLHL is working correctly. The adjustable pressure regulators can be adjusted to different pressure setpoints to help protect against sudden changes in water pressure.

The mounting bracket is used to securely mount the WLHL onto the water pipe or pressure chamber. This helps to ensure that the WLHL is in the correct position and is able to detect the pressure accurately.

These are the basic components of a WLHL and they work together to safely and quickly detect and shut off water flow during a low pressure event. This helps to protect against potentially catastrophic flooding, damage to equipment, and other costly problems associated with low water pressure.

The WLHL can be classified into the categories of Snap Action and Limit Switches depending on the type of switch mechanism used. A Snap Action switch is a type of switch that is designed to quickly change states when the pressure reaches a predetermined limit. A Limit Switch is a switch that is designed to remain closed until the pressure reaches a specific limit and then opens. Both types of switches are used in the WLHL to detect low pressure events and shut off water flow.

In conclusion, the WLHL is an important safety device that is used in residential and commercial settings to ensure the safety of the inhabitants and their equipment. It works by sensing and react to low pressure events by shutting off the flow of water and protecting the equipment from potential flooding and damage. The components of a WLHL work together to ensure that the switch is able to detect the pressure accurately and to shut off the water flow when necessary. The WLHL can be classified into Snap Action and Limit Switches depending on the type of switch mechanism that is used.

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