Quotation for semi-automatic valve positioner

working principle3730-2/3The digital electrical valve positioner is assembled onto the pneumatic control valve. The valve positioner receives electric control signals output by the control system or controller, and assists the pneumatic actuator in adjusting the valve position and achieving accurate positioning according to pre-set relationships. The valve positioner will input control signals (given parameters)w）Control valve position stroke or rotation angle (adjustable parameter)x）Compare and process feedback, and then output corresponding pneumatic control signals (output parameters)y）Provide pneumatic actuators.3730-2/3The digital electrical valve positioner is mainly composed of a microprocessorElectronic units, analog electrical converters, output pneumatic amplifiers, and electronic valve position sensor systemsform.When the input control signal changes or there is a valve position deviation, the pneumatic actuator is pressurized or depressurized. If necessary, the output gas volume can be adjusted to improve the signal pressure effect, and the output signal pressure limit value can also be set by software1.4、2.4or3.7barGas volume regulator with fixed set valueCan maintain a constant gas volume for emptying, used for positive pressure blowing inside the valve positioner housing and optimizing the output capacity of the pneumatic amplifier. Gas source pressure regulatorTo the electrical converterProvide a constant pressure gas source that is not affected by changes in external gas source pressure.

operationThe valve positioner is operated by a single knob button that is easy for users to master and use. By turning the knob button, parameters can be selected, and pressing the knob button activates the desired settings. All parameters are listed on the same level within the menu, without any submenus. This machine can check and modify all parameters.LCDCan display all parameters, and its reading direction can be180°Flip, no need to change the hardware position, just press the configuration parameter settings button to achieve it. On the valve positioner, use the sliding switch "air on" to set it/Qi Guan（Air to open/Air to close）”To correspond to the closing direction of the control valve and agree that when the control valve is in the "closed" position,LCDThe valve position display reading is0.INITThe key is used to activate initialization and start according to the configured parameters. After initialization is completed, the valve positioner immediately enters the closed loop operation state.SAMSONconfiguration softwareTROVIS-VIEWThe valve positioner can be configured, and a digital interface is also provided for the valve positioner to communicate withPCmachineRS-232Interface connection. In addition,3730-3All parameters of the digital electrical valve positioner can be usedHART®Communication access.