Patent ID: 7716993
Filing Date: 2010-05-18
Classification: G01F,Y10T

Abstract:
1. A gas flow rate verification unit to be mounted downstream of a flow rate control device, comprising: a first cutoff valve including a first input port to be connected to the flow rate control device for inputting a gas, a first output port for outputting the gas, and a first valve seat for communicating the first input port and the first output port; a second cutoff valve including a second input port to be connected to the first cutoff valve, a second output port for outputting the gas, and a second valve seat for communicating the second input port and the second output port; a communication member to be connected to the first output port and the second input port for communicating the first cutoff valve and the second cutoff valve with each other; a pressure detector for detecting a pressure of the gas supplied between the first cutoff valve and the second cutoff valve; a temperature detector for detecting a temperature of the gas supplied between the first cutoff valve and the second cutoff valve; and a control device for verifying a flow rate of the gas flowing through the flow rate control device by using a result of the pressure detected by the pressure detector and a result of the temperature detected by the temperature detector, wherein a volume of the gas from the first valve seat to the second valve seat is not more than a volume from an outlet of the flow rate control device to the first valve seat.