Novel FLVV

Abstract

The invention discloses a novel FLVV. The novel FLVV comprises a valve base and a flange part, wherein the valve base is fixedly connected to a fuel tank through the flange part, an O-shaped sealing ring is furthermore arranged between the valve base and the flange part, a large valve element assembly and a small valve element assembly are arranged on the valve base, the small valve element assembly is arranged inside the large valve element assembly, the upper end of the valve base is provided with a large ventilation hole and a small ventilation hole corresponding to the large valve elementassembly and the small valve element assembly, and sealing is achieved through a sealing assembly. A large valve element is more sensitive, can be switched off timely, and can reduce dynamic leakage to a great extent; a small valve element has a strong capacity to be reopened, and can maintain low pressure inside the fuel tank; and meanwhile, since the ventilation hole of a small floater is small,and the small floater is located inside a large floater, dynamic leakage generated by the hole corresponding to the small floater is also low.

Description

technical field [0001] The invention relates to the technical field of vehicle-mounted fuel recovery systems, in particular to a novel FLVV valve. Background technique [0002] The existing fuel tank valve is designed with a single spool, and a moving component moves up and down to realize the opening and closing of the vent hole. In order to ensure a large air flow, the large vent hole will be opened synchronously. Because the single-spool valve needs to ensure the re-opening ability of the spool, that is, under the condition of pressure, the spool can fall from the closed position in time to restore the ventilation ability, so the single-spool will be relatively slow, resulting in fuel It is easy to escape from the large vent hole, causing serious dynamic leakage; during the running of the vehicle, the single valve core is easy to close prematurely, blocking all the vent passages, resulting in excessive pressure in the fuel tank, so it needs to be improved. Contents of t...

AI Technical Summary

Problems solved by technology

Because the single-spool valve needs to ensure the re-opening ability of the spool, that is, under the condition of pressure, the spool can fall from the closed position in time to restore the ventilation ability, so the single-spool will be relatively slow, resulting in fuel It is easy to escape from the large air vent, causing severe dynamic leakage; the single spool is easy to close prematurely during vehicle running, blocking all the air passages, resulting in excessive pressure in the fuel tank, so it needs to be improved

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