Which of the following actions is unnecessary after installing a non-surge check valve?

After installing a non-surge check valve, adjusting the opening rate is unnecessary because this type of valve is designed to allow fluid flow in one direction and automatically closes in response to backflow. Non-surge check valves typically do not require manual adjustment of their opening mechanism, as they are engineered to function effectively at their specified flow conditions. Instead, they respond to the pressure of the fluid when it moves in the intended direction.

In contrast, testing the flow rate, inspecting for leaks, and ensuring the correct orientation are critical steps after installation. Testing the flow rate verifies that the valve is operating as expected and not restricting flow excessively. Inspecting for leaks helps to ensure that there are no issues with the integrity of the installation, which could lead to fluid loss or system inefficiency. Ensuring the correct orientation is essential since check valves are directional devices; installing one backwards could prevent it from functioning properly, potentially causing system failure.