14. What is the difference between a check valve (By – Pass Valve) and a non-return?

A check valve and a non-return valve are essentially the same thing and are used interchangeably. Both terms refer to a valve that allows fluid or gas to flow in only one direction and prevents backflow. The purpose of a check valve is to ensure that the flow of fluid or gas is unidirectional, preventing any reverse flow or backflow. This is important in various applications where backflow can cause damage or disrupt the system's operation. So, there is no difference between a check valve and a non-return valve; they are different names for the same type of valve.