Differential pressure valve with reduced spring-surge and method for reducing spring surge
OwnerRiccardo Bagagli, Leonardo Tognarelli +2inventors
InventorsRiccardo Bagagli, Leonardo Tognarelli, Carmelo Maggi, Alberto Babbini
Life of this patent
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Abstract
Disclosed is a differential pressure valve comprising: a valve body, the valve body having at least one flow inlet and one flow outlet: at least one shutter, the shutter being movable between an open position and a closed position under a differential pressure across the valve; at least one flow passage from the flow inlet to the flow outlet; at least one biasing member configured to bias the shutter towards a closed position so as to block the flow passage through the flow inlet. The biasing member is a non-linear biasing member.
Claims18
A differential pressure valve comprising:
- a valve body, the valve body comprising at least one flow inlet and one flow outlet;
- at least one shutter, the shutter being movable between an open position and a closed position under a differential pressure across the valve;
- at least one flow passage from the flow inlet to the flow outlet;
- at least one biasing member configured to bias the shutter towards a closed position so as to block the flow passage through the flow inlet, wherein the biasing member comprises a first non-linear helical spring and a second non-linear helical spring arranged in parallel;
- at least one shutter guide fixedly arranged inside the valve body, the shutter being slidingly guided by the shutter guide;
- and
- a flow passage from the flow inlet to the flow outlet, the flow passage being formed between an inside surface of the valve body and an outside surface of the shutter guide and of the shutter, wherein the biasing member is housed at least partially in the shutter guide.
A differential pressure poppet valve comprising:
- a valve body, the valve body comprising at least one flow inlet and one flow outlet;
- at least one shutter guide fixedly arranged inside the valve body;
- at least one poppet shutter slidingly guided by the shutter guide;
- a flow passage from the flow inlet to the flow outlet, the flow passage being formed between an inside surface of the valve body and an outside surface of the shutter guide and of the poppet shutter;
- at least one biasing member at least partially housed in the shutter guide and configured to bias the poppet shutter towards a closed position so as to block the flow passage through the flow inlet, wherein the biasing member comprises a first non-linear helical spring and a second non-linear helical spring arranged in parallel;
- a surge-suppression arrangement configured to suppress or mitigate surge phenomena in the biasing member.
A method for mitigating or suppressing spring surge in a differential pressure valve, the method comprising:
- providing the differential pressure valve, wherein the differential pressure valve is a poppet valve comprising:
- a valve body, the valve body comprising at least one flow inlet and one flow outlet;
- at least one shutter, the shutter being movable between an open position and a closed position under a differential pressure across the valve;
- a flow passage from the flow inlet to the flow outlet;
- at least one biasing member configured to bias the shutter towards a closed position so as to block the flow passage through the flow inlet, wherein the biasing member comprises a first non-linear helical spring and a second non-linear helical spring arranged in parallel;
- at least one shutter guide fixedly arranged inside the valve body, the shutter being slidingly guided by the shutter guide;
- and
- a flow passage from the flow inlet to the flow outlet, the flow passage being formed between an inside surface of the valve body and an outside surface of the shutter guide and of the shutter, wherein the biasing member is housed at least partially in the shutter guide;
- and
- suppressing a propagation of resonance compression waves in the biasing member by a non-linear deflection of the biasing member.
A method for operating a reciprocating compressor, the compressor comprising a cylinder, a piston sliding in the cylinder, a suction duct with a suction valve and a discharge duct with a discharge valve, each valve comprising at least one shutter, the method comprising:
- providing for each shutter at least one non-linear biasing member configured to bias the shutter toward a closed position, wherein the at least one non-linear biasing member comprises a first non-linear helical spring and a second non-linear helical spring arranged in parallel;
- reciprocatingly moving the piston in the cylinder to suck a gas in the cylinder at a suction pressure and discharge the gas from the cylinder at a discharge pressure;
- and
- selectively opening and closing the suction valve and the discharge valve by differential pressures across the valves.
Dependencies are inferred from the claim text.