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US 8,136,547 B2Granted
Poppet valve with diverging-converging flow passage and method to reduce total pressure loss
AssigneeNuovo Pignones, P.A.
InventorsStefano Francini, Nicola Campo, Michele Bianchini
Life of this patent
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Abstract
A poppet valve is disclosed that include a valve body, a poppet guide disposed inside the valve body so as to form a flow passage from a flow inlet to a flow outlet of the valve, a poppet shutter disposed inside the poppet guide, and a converging-diverging flow passage formed by a portion of an outer surface of the poppet shutter and a corresponding portion of an inner surface of valve body. A method for reducing a closing pressure force acting on a poppet shutter of a poppet valve is also disclosed.
Claims20
A poppet valve, comprising:
- a valve body, said valve body having a central axis, a flow inlet, and a flow outlet;
- a poppet guide disposed inside the valve body so as to form a first portion of a flow passage from the flow inlet to the flow outlet, said flow passage being formed between an inside surface of the valve body and an outside surface of the poppet guide and passing through at least one hole in the poppet guide;
- a poppet shutter disposed inside the poppet guide so as to form a second portion of the flow passage between an outside surface of the poppet shutter and the inside surface of the valve body;
- and
- a converging-diverging flow passage formed by a portion of an outer surface of the poppet shutter and a corresponding portion of an inner surface of valve body,
- wherein the converging-diverging flow passage includes (i) a convergent portion, (ii) a minimum area portion, and (iii) a divergent portion.
3 more elements
A hyper compressor comprising a poppet valve that includes:
- a valve body, said valve body having a central axis, a flow inlet, and a flow outlet;
- a poppet guide disposed inside the valve body so as to form a first portion of a flow passage from the flow inlet to the flow outlet, said flow passage being formed between an inside surface of the valve body and an outside surface of the poppet guide and passing through at least one hole in the poppet guide;
- a poppet shutter disposed inside the poppet guide so as to form a second portion of the flow passage between an outside surface of the poppet shutter and the inside surface of the valve body;
- and
- a converging-diverging flow passage formed by a portion of an outer surface of the poppet shutter and a corresponding portion of an inner surface of valve body,
- wherein the converging-diverging flow passage includes (i) a convergent portion, (ii) a minimum area portion, and (iii) a divergent portion.
3 more elements
A poppet valve, comprising:
- a valve body, said valve body having a central axis, a flow inlet, and a flow outlet;
- a poppet guide disposed inside the valve body so as to form a first portion of a flow passage from the flow inlet to the flow outlet, said flow passage being formed between an inside surface of the valve body and an outside surface of the poppet guide and passing through at least one hole in the poppet guide;
- a poppet shutter disposed inside the poppet guide so as to form a second portion of the flow passage between an outside surface of the poppet shutter and the inside surface of the valve body;
- a biasing member disposed inside an inner chamber of the poppet guide, said biasing member being configured to bias the poppet shutter toward an inside surface of the flow inlet so as to block the flow passage;
- a converging-diverging flow passage formed by a portion of an outer surface of the poppet shutter and a corresponding portion of an inner surface of the valve body;
- and
- a purge flow passage configured to place an inner chamber of the poppet guide in flow communication with a minimum area portion of the converging-diverging flow passage,
- wherein the converging-diverging flow passage includes (i) a convergent portion, (ii) the minimum area portion, and (iii) a divergent portion.
5 more elements
A hyper compressor comprising a poppet valve that includes:
- a valve body, said valve body having a central axis, a flow inlet, and a flow outlet;
- a poppet guide disposed inside the valve body so as to form a first portion of a flow passage from the flow inlet to the flow outlet, said flow passage being formed between an inside surface of the valve body and an outside surface of the poppet guide and passing through at least one hole in the poppet guide;
- a poppet shutter disposed inside the poppet guide so as to form a second portion of the flow passage between an outside surface of the poppet shutter and the inside surface of the valve body;
- a biasing member disposed inside an inner chamber of the poppet guide, said biasing member being configured to bias the poppet shutter toward an inside surface of the flow inlet so as to block the flow passage;
- a converging-diverging flow passage formed by a portion of an outer surface of the poppet shutter and a corresponding portion of an inner surface of the valve body;
- and
- a purge flow passage configured to place an inner chamber of the poppet guide in flow communication with a minimum area portion of the converging-diverging flow passage,
- wherein the converging-diverging flow passage includes (i) a convergent portion, (ii) the minimum area portion, and (iii) a divergent portion.
5 more elements
A method for reducing a closing pressure force acting on a poppet shutter of a poppet valve, said poppet valve having a valve body with a central axis, a flow inlet, and a flow outlet, said poppet valve including further a poppet guide and a biasing member configured to bias the poppet shutter disposed inside the poppet guide against the valve body so as to close the poppet valve, the method comprising:
- as the valve starts to open and the poppet shutter is located near a seating surface of the valve body, increasing the total pressure loss at the location of a converging-diverging flow passage formed by a portion of an outer surface of the poppet shutter and a corresponding portion of an inner surface of the valve body so as to increase a force acting on the poppet shutter to cause the valve to open;
- and
- as the valve continues to open and the poppet shutter moves further away from the seating surface, decreasing the total pressure loss as a throat area of the converging-diverging flow passage increases,
- wherein the converging-diverging flow passage includes (i) a convergent portion, (ii) a minimum area portion, and (iii) a divergent portion.
1 more element
Dependencies are inferred from the claim text.