Patent ID: 9638081
Date: 2017-05-02
CPC Classifications: F01N,F16K,G05D

Claim:
1. A fluid metering unit comprising: a housing comprising an inlet port and an outlet port; a first solenoid valve having an inlet and an outlet at opposite ends of a central longitudinal axis; a second solenoid valve having an inlet and an outlet at opposite ends of a central longitudinal axis; a flow path within the housing from the inlet port to the inlet of the first solenoid valve, from the outlet of the first solenoid valve to the inlet of the second solenoid valve, and from the outlet of the second solenoid valve to the outlet port; a first sensor having a central longitudinal axis at one end of which a sensing tip of the first sensor is exposed to the flow path at a location between the inlet port and the inlet of the first solenoid valve; a second sensor having a central longitudinal axis at one end of which a sensing tip of the second sensor is exposed to the flow path at a location between the outlet of the second solenoid valve and the outlet port; the housing comprising multiple cavities having central longitudinal axes which are mutually parallel; the first solenoid valve, the second solenoid valve, the first sensor, and the second sensor each being disposed in a respective cavity coaxial with the central longitudinal axis of the respective cavity; and an electric-operated temperature control element in thermally conductive contact with the housing for controlling temperature along at least a portion of the flow path.