The flapper indicator, also known as the flap check valve, is a necessary accessory to observe the flow of the medium in the pipeline. Backstop sight glass is widely used in petroleum, chemical, chemical fiber, cooling system and other industrial production to observe the flow reaction of liquid, gas, steam and other media, and is an indispensable accessory to ensure normal production. The flap indicator is equipped with a needle valve to adjust the flow size and control.
The flap indicator, which can be installed on the main water supply pipe or the branch water pipe, gives the medium flow value in a small area of a certain sub-area, which is convenient for observing the flow rate in the pipe.

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