Return valve maintenance
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The backflow valve is very important in the hot melt machine and hot melt spraying system, hot melt adhesive spraying equipment. The Walte hot melt machine has been adjusted to the appropriate application range when the factory is out of the factory. The main function of the return valve device is to protect the gear pump and drive device to prevent the system from operating under excessive pressure. If you need to adjust the return valve, first of all to ensure the hot melt glue machine, hot melt pipe and the hot melt glue gun is working at a given temperature, then loosen the locking screw, the reflux valve on the valve is opened, so that automatic hot melt into the hot melt glue gun, then turn off the valve, let the glue in back flow and pressure observation (detectable pressure gauge), straight into a suitable pressure so far, the best lock nut.
Return valve adjustment
The return valve is the function of overload operation to prevent overvoltage protection system in the state of the gear pump and the driving device, the factory is set to 27 bar (400 psi) is the most suitable application range, but can be adjusted according to the different requirements.
The application should be regulated in the placement of melt pressure gauge, pressure measuring device to change, if the pressure measuring instrument malfunction can lead to a voltage level.
1. check system equipment, pipework, and spray gun to ensure that they are in an ideal equipment temperature condition.
2. loosen the lock nut that is fixed on the return valve adjusting screw.
3. rotating motor, refer to the fifth chapter operation, and adjust the speed.
4. open the spray gun valve to allow the adhesive to flow freely.
5. turn off the spray gun valve to stop the flow of adhesive.
6. apply a wrench, rotate the adjusting screw erclockwise to lower the pressure, or rotate the adjusting screw clockwise to increase the pressure of the throat.
7. tighten the locking nut until the desired pressure is achieved, and the system completes the adjustment step.