The YCK-P5 model (formerly SG-A type) differential pressure switch is suitable for double-line centralized lubrication systems with a nominal pressure of 40MPa. It controls directional valves or monitors the lubrication system by utilizing the pressure difference between two pipes to send electrical signals. When the pressure difference reaches 5MPa, a signal is emitted to control the directional valve's direction or monitor the lubrication system. It is generally installed at the ends of the two main pipes in terminal-type double-line centralized lubrication systems.