Sprinkler Valve Modification (Not an Orbit)

[OvaR8ed]

I need to convert this solenoid valve to pnuematic, but it is slightly different to the Orbit one that everybody uses...

I'll add a couple more pics to explain the inner workings

[mark.f]

The principle is the same... Drill a hole in the cover and tap it to accept a threaded pilot valve/plumbing.

You can just leave the solenoid attached or remove it and plug the hole with epoxy.

[OvaR8ed]

That was the plan, but this calve has a guide pin that is fixed to the top lid and not the bottom part of the valve body (See image, flow from left to right)

I'm afraid if I drill the top out that there might be too much movement on the seal and that it might render the valve useless

[jrrdw]

The principle is the same... Drill a hole in the cover and tap it to accept a threaded pilot valve/plumbing.

You can just leave the solenoid attached or remove it and plug the hole with epoxy.

Yup, and pull the guide pin and seal the hole in diaphram.

[OvaR8ed]

The principle is the same... Drill a hole in the cover and tap it to accept a threaded pilot valve/plumbing.

You can just leave the solenoid attached or remove it and plug the hole with epoxy.

Yup, and pull the guide pin and seal the hole in diaphram.

Pulling the pin might be ok since the cylinder on the diaphram doesn't have that much play on it.

If I seal the hole in the diaphram, how will the pressure from the main chamber equelize to the small chamber above the diapham to keep it closed? Else it's only the spring keeping the valve closed, or am I missing something...?

[OvaR8ed]

I decided to swop the valve out for another model. This one has a guide pin (more like a tube) coming up from the bottom and much more meat in the middle of the top cover to tap my trigger valve / nozzle.