Liquid/Gas Shut Off - How to properly?

[masofon]

Maybe I'm just misunderstanding the use of this device...what I want to achieve is to stop liquid from dripping into a pool when said pool is full, via automation to a liquid shut off valve - without having to feed that water elsewhere instead. I feel like this should be fairly basic functionality - it's like a tap. However, in reality, unless the water is diverted elsewhere it still continues to drip through the shut off even if it is set to...shut off. The pump is a long distance away, otherwise I would just automate the pump instead, but I'd like to use this functionality elsewhere (e.g. feeding gas out of a gas reservoir) so I'd like to understand how to properly make it work. Additionally, I have tried looping the pipe around so the water is diverted back round on itself a bit, but this just ended up a confused mess of liquid going back and forth, even with the use of bridges to try and control direction - and still dripping through. I generally like to find solutions that are as clean and simple as possible. Any help would be appreciated!

[leoroy]

Maybe a screenshot could help?

 

[Decius]

When connected to an automation wire, the "shut off" acts like a "turn on", allowing flow when a signal is present and blocking flow when there is no signal.

You should not have a pipe connection between the input and output of the shutoff, you should have a pipe to the input and an unconnected pipe from the output.

[Soulwind]

Decius is right, you've probably got your automation set up backwards.  The shut-off valves are CLOSED by default and OPEN when receiving an automation signal.  Note that the valve does need to be powered.  If it's not powered, then it is CLOSED all the time.

If that info doesn't solve your issue, then post a screenshot of your piping and automation overlays and we'll try to help out further.

[Nitroturtle]

If you have a valve that's limiting flow, adding a shut-off can be tricky because of the way packets move through valves.  You have to make sure you have a relief that loops around and allows the excess to flow out of the valved part of the system.  A screenshot would help.

[Kabrute]

it sounds like your line is bridged over your valve, you can not insert a shut off into an existing line, you have to create a break then bridge the gap with the shut off to force the fluid through the shut off and not let it flow past

[Moggles]

Here's a simple set up I use with two shutoff valves. The first stops the incoming flow. The second shutoff loops the elements back in to an overflow tube which has priority next time the system turns on. You can insert a flow rate valve anywhere between the two shutoffs if you need to be more precise with numbers.

The bridge on the input line is only there to protect against potential back flow if you happened to have other T offs earlier along the main line. If the flow is guaranteed to be in one direction only you can lose the bridge. But the overflow and the main input line will trade turns rather than the overflow having full priority.

In action (gif):

Spoiler

Here's a valved example at 100gs per second. Normally the whole packet inside the valve would leak through in to the pool but I only go over the sensor threshold by 500g. Mostly due to sensor delay and the small length of pipe before the vent.

Spoiler

 

 

[Neotuck]

7 hours ago, Moggles said:

Here's a simple set up I use with two shutoff valves. The first stops the incoming flow. The second shutoff loops the elements back in to an overflow tube which has priority next time the system turns on. You can insert a flow rate valve anywhere between the two shutoffs if you need to be more precise with numbers.

The bridge on the input line is only there to protect against potential back flow if you happened to have other T offs earlier along the main line. If the flow is guaranteed to be in one direction only you can lose the bridge. But the overflow and the main input line will trade turns rather than the overflow having full priority.

In action (gif):

  Hide contents

Here's a valved example at 100gs per second. Normally the whole packet inside the valve would leak through in to the pool but I only go over the sensor threshold by 500g. Mostly due to sensor delay and the small length of pipe before the vent.

  Reveal hidden contents

 

 

Why use two shut-offs?  Seems overcomplicated when a single shut-off does the job just fine

[Moggles]

The second shutoff prevents the issue the OP was trying to resolve. Leakage. After the initial shutoff closes anything already in the output pipe will continue through. This contraption allows you to measure an element down to the gram with some tweaking.

[Neotuck]

20 minutes ago, Moggles said:

The second shutoff prevents the issue the OP was trying to resolve. Leakage. After the initial shutoff closes anything already in the output pipe will continue through. This contraption allows you to measure an element down to the gram with some tweaking.

But if the shut-off is before the vent... What leakage?

[ONIfreak]

I don't get it either why use two shuts off? 

I always use basic designs :

- 1 shutoff to stop liquid going to some pool

- 2 shuts off to split and stop liquid gping to two pools

- 1 shutt off and bridge to redirect water flow so it goes constantly either to first either to second pool ( this setup does not jace possibility to stop the flow unless you put extra shut off before setup) 

[The Flying Fox]

I believe Moggles is talking about a situation where, if you have a shut-off valve behind a normal valve and you turn-off the shut-off valve, the normal valve will continue to output packets until the pipe in-between it and the shut-off valve is fully cleared.  Even with the shut-off valve connected directly to the normal valve, there will be at least a 10KG packet sitting in the pipe that the normal valve will continue to clear until it's fully gone.

 

So, if you're wanting to accurately measure/limit liquid for some reason, below 10KG/s then you'd use either the setup Moggles posted in the 'Hidden contents' of his post, of use this:

 

It works basically the same way.  The last packet produced by the shut-off valve will pass the input of the normal valve, then flow away from it to be cycled back.

 

[ONIfreak]

12 minutes ago, The Flying Fox said:

I believe Moggles is talking about a situation where, if you have a shut-off valve behind a normal valve and you turn-off the shut-off valve, the normal valve will continue to output packets until the pipe in-between it and the shut-off valve is fully cleared.  Even with the shut-off valve connected directly to the normal valve, there will be at least a 10KG packet sitting in the pipe that the normal valve will continue to clear until it's fully gone.

 

So, if you're wanting to accurately measure/limit liquid for some reason, below 10KG/s then you'd use either the setup Moggles posted in the 'Hidden contents' of his post, of use this:

 

It works basically the same way.  The last packet produced by the shut-off valve will pass the input of the normal valve, then flow away from it to be cycled back.

 

Ok but on that picture there is hydro sensor. Just do on it -10kg and this shoild solve this issue.