California ICC UST Inspector Practice Exam

Where should a single check valve be located in suction piping?

1. Anywhere approved by a local agency

2. Below the drain valve

3. Close to the pick-up tube

4. Close to the suction pump

The correct answer is: Close to the suction pump

The appropriate location for a single check valve in suction piping is close to the suction pump. This positioning helps ensure that the check valve can effectively prevent backflow of the liquid from the pump into the piping system, which could potentially lead to loss of prime and operational issues. Installing the check valve near the suction pump minimizes the risk of cavitation and maintains the efficiency of the pumping system. By placing it close to the pump, the check valve is better able to respond to changes in pressure and flow, providing optimal performance and safeguarding the integrity of the system. This strategic positioning also aligns with best practices and guidelines for system design, which focus on ensuring that check valves function effectively and reliably in maintaining one-way flow in suction applications.