Maintaining an accurate and stable boiler drum water level is one of the most critical safety and efficiency requirements in power plants and industrial boilers. Even a small deviation in drum level can cause carryover, water hammer, turbine damage, or dry-firing , leading to severe equipment failures. To protect the boiler from such risks, many systems use a highly reliable device known as the Morbey Switch . In this article, we will explain what a Morbey switch is , how it works , and how it controls boiler drum level . What Is a Morbey Switch? A Morbey Switch is a mechanical, float-operated level switch commonly used in boilers to sense low water level or very low water level (LL, LLL) . It is also known as a Marshalling or Morbey switch , depending on the manufacturer. It provides critical safety interlock signals for boiler trip or feedwater control based on drum water level. Key Features Simple mechanical design High reliability in harsh boiler environment...
The Morbey Switch (popularly known as the Murphy Switch ) is a highly reliable engine safety shutdown device widely used in diesel engines , generator sets , compressors , and industrial machinery. Its job is simple but extremely critical — protecting equipment from damage by shutting down the machine during abnormal operating conditions . What Is a Morbey Switch? A Morbey Switch is a mechanically or electro-mechanically operated safety switch designed to monitor engine parameters such as: Lube oil pressure Water temperature Lubrication oil temperature Fuel level Coolant level When the monitored parameter crosses the preset safe limit, the switch trips and triggers: Engine shutdown Alarm activation Safety interlock This makes the Morbey Switch a key component in engine protection systems. How Does a Morbey Switch Work? The working principle of a Morbey Switch is based on a spring-loaded latching mechanism : The switch continuously senses pressure, temperature,...