Question

What is the function of check valves?

(a) To prevent the reversal of flow of liquid

(b) To reduce the pressure

(c) To reduce the flow rate

(d) To increase the flow rate

I got this question in an interview for internship.

The query is from Instrumentation and Control topic in portion Instrumentation and Control of Fermentation Technology

Answer 1

Right choice is (a) To prevent the reversal of flow of liquid

The best I can explain: The function of check valves is to prevent the accidental reversal of the flow of liquid. It consists of three basic types of valves: swing check, lift check, and combined stop and check.