Patent ID: 8327880

Claim:
A fluid control system comprising: a main fluid path; at least two sensors for determining a state of fluid within the main fluid path; an isolation valve; fluid-filled connection paths between the main fluid path and each of the at least two sensors; wherein the connection paths comprise: first sensing tubes connected between the main fluid path and the isolation valve; the isolation valve; and second sensing tubes connected between the isolation valve and the at least two sensors; wherein the first and second sensing tubes are connected to inlet and outlet ports in closed ends of hollow cylinders in the isolation valve; wherein the inlet and outlet ports associated with each cylinder are non-communicating with the inlet and outlet ports of the other cylinders; wherein pistons are positionable in the cylinders so that free ends of the pistons engage with the closed ends of the cylinders to produce closure of the isolation valve; and wherein, upon closure of the isolation valve, the connection paths are interrupted so that the sensors are isolated from the main fluid path.