Apparatus and method for determining the characteristic of a flowmeter

摘要: A measuring cylinder has at its ends an inlet and outlet connected in a fluid system series with flowmeter. piston is adapted to travel through the as barrier. poppet valve on side of seal passage when closed so travels barrier, permit flow open. retracting having smaller cross-sectional area than rod between open close moves relative piston. The movement controlled hold upstream position prior test run, release run initiated, return after run. In one embodiment, during maintain constant difference pressure downstream sides