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2 psi relief valve with low head loss?

2 psi relief valve with low head loss?

2 psi relief valve with low head loss?

(OP)
I'm designing a fuel tank with a draw tube at the bottom of the tank. Fuel is "pulled" out of the tank by transfer pump which is mounted far from the fuel tank. The fluid in the tank itself never has more than 2psi of head. The rest of the "pull" is provided by the pump. I would like to put a valve in the line directly below the fuel tank so that if the line is broken between the tank and the pump, the entire tank of fluid does not drain onto the ground.

A 2 psi relief valve doss the trick, because once the line is broken and the pump is essentially disconnected, the fluid head in the tank is not enough to pop the valve. However, the pressure drop across the valve of 2 psi is more than my system can accommodate due to flow restrictions in other places in the line (there are filters between the tank and the pump).

Is there such a thing as a valve that:
- doesn't allow flow below 2psi of pressure, and:
- allows flow above 2psi with less than 2psi of head loss.

Thanks!

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