Full Pressure release valve

[deval vyas]

TL;DR Summary

Pressure release valve that operates to release all the pressure

A mechanical pressure release valve opens at pre designed pressure and then automatically closes once pressure drops to a lower point generally around 5 to 10% of the designed release pressure.

However I need a mechanical pressure release valve which opens automatically at pre designed pressure around 10 to 15 bars... but does not close until All the pressure is released.

The valve can could then reset automatically once all the pressure is released.

It has to be a mechanical valve and Electricity can't be used.

The valve has to ideally reset automatically. However if automatic reset is not possible then manual reset has to happen without replacement of any parts... So a rupture disk or breaking pin etc can't be used.

May be it has a stopper pin or something which will not allow the pressure release valve to close automatically.. Unless it's reset...

Is there any way to design such a valve?

 

[Tom.G]

Summary:: Pressure release valve that operates to release all the pressure

Is there any way to design such a valve?

Yes.
A spring-loaded pin that blocks the valve from closing. Manual reset by pulling the pin and closing the valve.

A possible Auto- reset could be substituting a spring loaded diaphragm (sensing the tank pressure) pushing the pin in and a weak spring retracting the pin. Note that this would not allow the valve to close under partial tank pressure without manual intervention (as may be needed for testing purposes).

Cheers,
Tom

 

[deval vyas]

Yes.
A spring-loaded pin that blocks the valve from closing. Manual reset by pulling the pin and closing the valve.

A possible Auto- reset could be substituting a spring loaded diaphragm (sensing the tank pressure) pushing the pin in and a weak spring retracting the pin. Note that this would not allow the valve to close under partial tank pressure without manual intervention (as may be needed for testing purposes).

Cheers,
Tom

Thanks Tom. Does it go by any particular name or Is it available in market with any company? I Can directly talk with them and source it.

 

[Baluncore]

Is there any way to design such a valve?

The problem here is that the valve must withstand up to 225 psi before it cracks, to full open. It must then stay open until the flow stops. I don't think there is an available product that satisfies your requirement.

I would consider a hanging flap valve, held shut by a magnet. When pressure reaches the trigger pressure, the magnet let's go, the valve opens and the flap is held open by the flow. As the flow reduces the flap gradually sinks against the flow, until the magnet gets close enough to re-seal the valve.

 

[russ_watters]

Do pneumatic controls count as "mechanical"? What exactly/why is that constraint?