VPR pneumatic valve common fault treatment

First, the VPR pneumatic valve works Input signal increases, the bellows expansion to promote the baffle (ie, lever) * near the nozzle end. 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 produced 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. Second, the VPR pneumatic valve fault types and causes a positioner no output pressure Failure reasons: 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 supply pressure is too low. 4, plug the throttle orifice, use less than 0.2mm diameter wire to clear. 5, Locator zero position is not properly adjusted, that is, the gap between baffle and nozzle is too big. Use tools to readjust. 6, the 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, the baffle and the nozzle face is not vertical, the baffle and the nozzle face contact is still 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. Fault signal to reduce the second, the output pressure does not reduce the cause of the malfunction: 1, zero position adjustment is not appropriate, that nozzle gap is too small. 2, the relay diaphragm at the throttle aperture is too small or blocked, the use of 0.3mm wire to clear. 3, the bypass mechanism switch position error, the switch should be located in the "ON" position. 4, the deviation spring is too hard or wrong choice, supply pressure 0.22MPa wire diameter of 1.3mm, 0.28 ~ 0.5MPa when the spring wire diameter of 1.4mm. 5, the cam installation location is wrong. Failure of three gas, no signal, the control valve has completed most of the trip failure reasons: 1, the relay valve seat and the valve core SR2.3 out of contact or poor seal. 2, in the initial position, baffle and the nozzle face has been in close contact. Fault four basic error (linear) failed Failure reasons: 1, feedback spring force or zero adjustment spring force is not properly adjusted. 2, the wrong position of the cam or the installation of the wrong travel pointer. 3, the relay valve seat and valve seat Verne unsealed. 4, the bellows stiffness is too low, the design requirements of 4.9N / mm. 5, the output pipe or actuator leak. 6, adjust the packing compression is too large. Fault adjustment error between the initial point of large failure reasons: 1, cam follower sleeve and the cam is not in contact. 2, the feedback spring selection error, the standard stroke of the spring wire diameter of 0.8mm, 0.7mm split signal. Failure six locator back to the poor (worse) failure reasons: 1, zero position or stroke adjustment is not proper. 2, the arm assembly fasteners loose. 3, zero position adjustment is not tighten the locking screw. 4, bellows poor flexibility, positive and negative displacement of the amount of slight differences. 5, cam follower bushing hole and cylindrical coaxiality beyond the design requirements. 6, the relay deviation spring poor parallelism between the two ends. 7, shaft and bearing radial or axial clearance is too large. 8, the gas pressure instability. 9, bushings and camshaft radial or axial gap. 10, the feedback spring has not been set to deal with.

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