Introduction

This example is done on a MARCO P1/2-E but applies to any horn that needs an electric valve to operate. These valves need periodic cleaning due to dirt in the pressure system.

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Image 1/2: Image 2/2:
  • Use the socket wrench to rotate the valve.

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Image 1/3: Don't lose the pieces:  put them in order in a safe place. A good example is a white sheet of paper. Image 2/3: Don't lose the pieces:  put them in order in a safe place. A good example is a white sheet of paper. Image 3/3: Don't lose the pieces:  put them in order in a safe place. A good example is a white sheet of paper.
  • Unscrew the fixing nut using the wrench.

  • Don't lose the pieces: put them in order in a safe place. A good example is a white sheet of paper.

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Image 1/3: Carefully unscrew the head of the valve: it could be hard to remove due to the threadlocker. Image 2/3: Use the Rib Jonit plier and apply a counterclockwise rotation on it. Image 3/3: Finish the unscrewing by hand.
  • Remove the solenoid (the black plastic box).

  • Carefully unscrew the head of the valve: it could be hard to remove due to the threadlocker.

  • Use the Rib Jonit plier and apply a counterclockwise rotation on it.

  • Finish the unscrewing by hand.

  • Don't lose the head: put it, again, in a safe place.

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Image 1/2: Inspect them for cleanliness and put them in a safe place. Image 2/2: Inspect them for cleanliness and put them in a safe place.
  • Gently tilt the whole thing and the spring and piston should exit the valve.

  • Inspect them for cleanliness and put them in a safe place.

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Image 1/2: Blow on the piston and other pieces, if dirty, as well. Image 2/2: Blow on the piston and other pieces, if dirty, as well.
  • Blow in the valve with compressed air to clean it

  • Blow on the piston and other pieces, if dirty, as well.

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Image 1/2: Then put the spring in the piston's hole. Image 2/2: Then put the spring in the piston's hole.
  • Place the piston, first.

  • Then put the spring in the piston's hole.

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Image 1/3: '''Don't exceed:''' you may permanently damage the device! Image 2/3: Screw the head on the valve. Image 3/3: Use the plier to tighten valve's head: there's no need to tighten it too much.
  • Put some threadlocker on the thread

  • Don't exceed: you may permanently damage the device!

  • Screw the head on the valve.

  • Use the plier to tighten valve's head: there's no need to tighten it too much.

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Image 1/3: Finally, screw the nut with the wrench. Image 2/3: Set the valve back in blace, using the wrench. Image 3/3: Set the valve back in blace, using the wrench.
  • Insert the solenoid and put the washer on the top.

  • Finally, screw the nut with the wrench.

  • Set the valve back in blace, using the wrench.

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Conclusion

Keep your valves checked, if you want them to last longer!

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Marco Spa

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