A five way ball valve is a special type of valve that has five channels and can control complex flow directions, such as one in four out or other flow directions. The design and operation of this valve are relatively professional, and the reasons why it cannot be used casually include:

1. Professional design: The design structure of a five way ball valve is complex and needs to be selected and configured according to specific application scenarios. For example, it can switch between multiple flow directions, but incorrect configuration may lead to abnormal system operation.

2. High operational requirements: To operate a five way ball valve, it is necessary to understand its working principle and operating specifications. Incorrect operation may result in valve damage or system failure.

3. Specific application scenarios: Five way ball valves are suitable for specific industrial and control systems, such as refining, chemical, petroleum, natural gas, etc. Using a five way ball valve in inappropriate scenarios may not achieve the expected results and may even pose safety hazards.

4. Pressure and temperature limitations: Five way ball valves have different applicable ranges for pressure and temperature. Exceeding these restrictions may result in valve failure or safety accidents.

5. Maintenance and adjustment: Five way ball valves require regular maintenance and adjustment to ensure their sealing and operational performance. These maintenance operations require professional knowledge and skills.

6. Installation requirements: The installation of a five way ball valve needs to follow specific specifications, including the selection of connection methods (such as threads, socket welding, butt welding, etc.) and the correct installation steps. Incorrect installation may result in leaks or other issues.

Therefore, the five way ball valve should not be used casually, but should be selected, installed, operated, and maintained by professionals according to specific application requirements and specifications to ensure its safe and effective operation.