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1. (WO2018078338) FUEL TANK PRESSURE RELIEF VALVE

Pub. No.:    WO/2018/078338    International Application No.:    PCT/GB2017/053162
Publication Date: Fri May 04 01:59:59 CEST 2018 International Filing Date: Fri Oct 20 01:59:59 CEST 2017
IPC: F16K 17/196
F16K 17/36
F16K 24/00
B60K 15/035
Applicants: FAIRFAX 3D DESIGN LIMITED
Inventors: POULTER, Trevor John
Title: FUEL TANK PRESSURE RELIEF VALVE
Abstract:
A fuel tank pressure relief valve (100) for relieving a pressure difference between the interior pressure of a fuel tank (190) and an exterior pressure external to the fuel tank, comprising: first (120) and second (122) sealing surfaces for mating to form an openable seal between the interior (196) and exterior (194) of the fuel tank; a housing (110) provided with the first sealing surface; a first plunger (126); a second plunger (128); and a venting port (112), wherein the first plunger is provided with the second sealing surface, wherein the first plunger is flexibly sealed to the housing by a first membrane (130) providing a first diaphragm area (A1) to open the seal formed between the first and second sealing surfaces when the interior pressure is above the exterior pressure by more than a first threshold differential pressure; wherein the second plunger is flexibly sealed to the housing by a second membrane (132) providing a second diaphragm area (A2) that is greater than the first diaphragm area, wherein the second plunger is engaged with the first plunger to bias the first plunger towards an open configuration of the first and second sealing surfaces when the interior pressure is lower than the exterior pressure to open the seal formed between the first and second sealing surfaces when the interior pressure is lower than the exterior pressure by more than a second threshold differential pressure; and wherein the first plunger is biased towards a closed configuration of the first and second sealing surfaces by a resiliently deformable member (140) to maintain the seal formed between the first and second sealing surfaces in a closed configuration when the interior pressure is not above the exterior pressure by more than a first threshold differential pressure and is not lower than the exterior pressure by more than a second threshold differential pressure.