The advantage of smart relief valve positioner
2015-01-18 by bridge
Traditional positioner is 4 ~ 20mADC current input or output coil from the regulator
relief valve sent when the barrier that is located among the moving coil of ferromagnetic and work. Because the magnetic field of permanent magnets located movable iron produced, and therefore, the two interacting magnetic fields, generated for the movable iron yaw moment, making it the fulcrum as the center deflection. The signal of Gas Heater Control Valve is increased, the lever on the left should be the next movement. In this case the fixed fence on the lever will be closer to the nozzle, the back pressure increased the amplifier, amplified by the output air pressure in the relief valve membrane withered section head, so the stem down. The displacement of the relief valve stem through the rod axis and converting the angular displacement feedback feedback plate, and then by adjusting the feedback range fulcrum body movement. Fixed to the other end of the feedback lever spring is stretched, creates a negative feedback torque, the lever balance, while the relief valve stem is also stable in a corresponding position determination, in order to achieve the ratio between the signal Range Top Burner Valve current and position. However, the conventional relief valve positioner amplifier constant orifice prone to clogging, maximum back pressure amplifier relief valve stuck, strictly off the nozzle and flapper and other shortcomings.