Red Seal Plumbing Practice Exam

Where is a non slam check valve used or placed?

1. On the main water line

2. Bolted between two flanges

3. At the outlet of a pump

4. Inside the tank

The correct answer is: Bolted between two flanges

A non slam check valve is typically used in situations where abrupt slamming of the valve is undesired, such as in a water line, where pressure changes occur frequently. Placing the valve between two flanges allows for easy installation and removal for maintenance purposes. Option A, on the main water line, is incorrect because it does not specify where on the main water line the valve should be placed. This could lead to confusion and improper installation. Option C, at the outlet of a pump, is incorrect because not all pumps require a non slam check valve at the outlet. It would depend on the specific pump and its function. Option D, inside the tank, is incorrect because a non slam check valve would not be necessary or effective inside a tank. Tanks are typically used for storage and do not have pressure changes that would require a non slam check valve.