Patent ID: 11946438
Assignee: EATON INTELLIGENT POWER LIMITED
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F  B | IPC B  F

Claim 0:
1. A pilot valve assembly for operating a pressure relief valve disposed within a fuel tank, the pilot valve assembly comprising:
a) a housing including a first chamber and a second chamber;
b) a first port in fluid communication with the first and second chambers, the first port being configured to receive an atmospheric pressure;
c) a second port in fluid communication with the first and second chambers, the second port being configured to receive a fuel tank pressure;
d) a first pilot valve arranged within the first chamber and configured to open only when a predetermined positive pressure differential exists between the first and second ports; and
e) a second pilot valve arranged within the second chamber and configured to open only when a predetermined negative pressure differential exists between the first and second ports;
f) wherein the pilot valve assembly is coupled to a pressure relief valve, and the first pilot valve is arranged to open only when a predetermined pressure differential exists between an upper diaphragm chamber of the pressure relief valve and atmospheric pressure, wherein when in the open position, the pilot valve assembly blocks an orifice between the upper diaphragm chamber and a lower diaphragm chamber.