VPR pneumatic valve working principle and locator five fault repair

VPR pneumatic valve positioner (referred to as VPR positioner) is Japan Yamatake - Honeywell VFR cam deflection valve dedicated attachment. It is in accordance with the pneumatic regulator signal, the regulator valve quickly and accurately, so as to accurately regulate the valve flow and ensure flow characteristics. I plant the introduction of production in the mid-eighties, has been widely used in petrochemical, power, light industry and chemical industry automation systems. In order to properly use and repair, need to explain its working principle. After the input signal increases, the bellows expands to push the baffle (ie lever) * near the nozzle end face. When the clearance is reduced, the back pressure of the nozzle is increased and the valve core is pushed down by the diaphragm of the relay. The air inlet opens a large exhaust port to close the output pressure increases, so the actuator push rod to move down to make the valve spool open or closed. As the spool rotates, the cam also rotates and the feedback spring is pulled by the cam follower so that the baffle tends to leave the nozzle until the torque generated by the bellows is balanced with the feedback spring moment. As a result of this torque balance, to ensure that the valve opening and input signals corresponding relationship between the accurate, to achieve the correct spool positioning. The following analysis of common causes of failure and measures. Simple exclusions will be omitted. Fault a positioner no output pressure 1. No signal pressure, â‘  pneumatic regulator failure; â‘¡ large number of signal line leak. 2. A large number of bellows leak, repair solder or replacement 3. No gas pressure or gas pressure is too low. 4. Corrugated throttle orifice plugged, using a diameter of less than 0.2mm wire to clear. 5. Locator zero position adjustment is inappropriate, that the gap between the bezel and the nozzle is too large. Use tools to readjust. 6. Cam installation location is wrong. Because a cam contains air-open and air-off, respectively, and other percentages; open air and gas-off linear features, with four mounting holes, easy to install the wrong. 7. Baffle and nozzle end face is not vertical, the baffle and the nozzle face is still in contact after a lot of exhaust. 8. Nozzle hole end face pit, need to be replaced. Burr on the end surface, re-ground. 9. Nozzle and base adhesive leaks. More Keywords Search: Valve

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