A, VPR pneumatic valve after the increase of the working principle of input signals, bellows expansion to push the flap ( The lever) * close to the nozzle end face. Gap decreases the nozzle back pressure increases, through relay diaphragm push down valve core. Air inlet on large vent off small increase output pressure, so the actuator push rod moves down the regulator Industrial Valves core is turned on or off. With rotational Industrial Valves core, the CAM rotation, through the CAM follower boost feedback spring, make the baffle tend to leave the nozzle, the torque developed until the bellows and feedback spring torque balance each other. Due to this kind of moment balance, ensure the valve opening and the corresponding relationship between the input signal accurately, implements the correct valve core positioning. Second, the VPR pneumatic valve fault types and reasons of the failure a locator without output pressure failure reason: 1, no signal pressure, pneumatic regulator malfunction; (2) signal of pipeline leak a lot. 2, corrugated pipe, a large number of air leakage, repair soldering or replace 3, no gas pressure or gas supply pressure is too low. 4, and blockage of the corrugated pipe orifice, the use of diameter of less than 0. Unblock 2 mm wire. Adjust the wrong 5, locator zero position, namely baffle and nozzle gap is too big. Use tools to adjust. 6, CAM installation position error. Because a CAM respectively containing gas with open and closed type of breath, percentage; Gas open and closed type linear characteristic gas, there are four mounting holes, easy to misplace. 7, baffle, and the nozzle end face is not vertical, the baffle is still a large number of exhaust after contact with the nozzle end face. 8, nozzle hole end there are potholes, need to change. Face a burr, regrinding. 9, a nozzle and a base stick it leak. Fault 2 signal decreases, and output pressure does not reduce the cause of the problem: 1, the zero position adjustment is not appropriate, the nozzle baffle gap is too small. Unblock the 3 mm wire. 3, bypass switch position error, switch should be located in the 'ON' position. 22 mpa spring wire diameter is 1. 3毫米,0。 28 ~ 0. 5 mpa spring wire diameter is 1. 4mm。 5, CAM installation position error. Fault three gas supply, no signal, the regulator has completed most of the trip the cause of the problem: 1, relay valve seat and valve core SR2. 3 spherical from contact or seal is not good. 2, in the initial position, the baffle is close contact with the nozzle end face. Four basic fault error ( Linear) Unqualified failure reason: 1, the feedback spring force or zero adjust the spring force. 2, CAM installation position error or the wrong pointer. 3, relay valve core and valve seat valve line is not sealed. 4, corrugated pipe stiffness is too low, the design requirements 4. 9N/mm。 5, output pipeline leak or actuator. Adjust the volume of packing compression between June and is too big. Fault five adjusting the initial point error between the cause of the problem: 1, the shaft sleeve and the CAM CAM follower did not contact. 2, feedback spring select error, the standard of spring wire diameter of 0. 8 mm, cheng signal is 0. 7mm。 Failure six locator return difference ( Variation) Unqualified failure reason: 1, the zero position or improper travel adjustment. 2, derrick components of loose fasteners. 3, after the zero position adjustment screw lock screw. 4, corrugated pipe flexibility is poor, and stroke displacement has a tiny difference. 5, the CAM follower shaft sleeve hole and cylindrical coaxial degree beyond the design requirements. 6, relay deviation spring two parallel is poor. 7, shaft and bearing radial or axial clearance is too large. 8, gas supply pressure is not stable. 9, shaft sleeve and the CAM shaft radial or axial clearance. 10, feedback spring without processing.
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