FP74E DIFFERENTIAL PRESSURE CONTROLS

FP74E pressure differential controller is equipped with two highly sensitive bellows pressure sensing elements, which
are positioned face-to-face. When the pressure at either end of these elements changes, it triggers the switch mechanism to control equipment such as motor drivers or valve actuators. The switch mechanism provides a SPDT (Single-Pole Double-Throw) non-rapid action (floating) operation. A movable common contact will either make contact with one of the two fixed contacts or remain between the two fixed contacts.

FP74E differential pressure control is usually used in the water system of central conditioning. It controls the pressure difference between water supply pipe and return pipe. According to the differential pressure, the movement of floating-point will connect the contact plate to open or close the operating valve of motor drive.

One typical application is to mount the valve on the by-pass line near the system's water pump. When the pressure
differential between the system's feeding and return pipes is over the setpoint of the controller, the valve turns up and more water will flow through the by-pass valve and hereby reduces the pressure differential between feeding and return pipes.

On the opposite, the pressure differential will increase between these two pipes of the water system.