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VALVE for flows in two pipes

VALVE for flows in two pipes

VALVE for flows in two pipes

I have two pipes of equal diameter running alongside each other, as part of different circuits. Sometimes the fluid inside each pipe will be flowing in 'opposite' directions and sometimes the fluid in each will flow in the same direction.

Is there a valve in existence that I could use to stop the flows in both pipes whenever the flow directions (and presumably the pressures causing these flows) are 'opposite', but allow both flows whenever the flows are in the same direction?

RE: VALVE for flows in two pipes

Yes, they are called check valves...or non-return valves.

RE: VALVE for flows in two pipes

non-return valves will only stop the flow in one way. The way Anthony described it makes me think the flow can be in either direction, it just has to be the SAME direction in both pipes.

Try to draw what it is exactly you want to achieve in a schematic, and bring that to your hydraulics supplier (or post it here). I think that's the best way to get a result.  

NX 7.5
Teamcenter 8

RE: VALVE for flows in two pipes

Hard to tell what is required from the description...

Possibly Pilot Operated Check Valves then...

RE: VALVE for flows in two pipes

No single valve that I know of.

I think you could get there with a pilot operated valve in each line, and some check valves to control the pilots from each process line.

Slightly more difficult if you cannot allow cross-contamination via the pilot circuit.

RE: VALVE for flows in two pipes

What are the fluids and pressure drops allowable? Need more information.

Two rotary gear or vane motors/pumps, with the shafts coupled together, will do what you want. One fluid through each positive displacement section. They could be in one housing, or if cross contamination is not allowed, two separate housings with the shafts coupled externally.

The pressure drops would be quite high, guessing 50 to 200 psi to get them turning.

Other than that, I can only think of two flow meters, electrical controls, and a solenoid valve in each line to shut things off.

RE: VALVE for flows in two pipes

Kcj, I like that idea.  If they can add controls, even 2 full port ball valves would work and flow monitors.

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