Question 130Refrigeration & AC - QMED

The correct answer is D) suction valve. When starting a reciprocating refrigeration compressor that has been shut down for a period of time, you should manually throttle the suction valve. This is because the compressor can experience liquid slugging if the suction valve is opened fully, which can damage the compressor. Throttling the suction valve allows the compressor to gradually build up pressure and draw in refrigerant, preventing liquid refrigerant from entering the compressor too quickly. The other options are incorrect because the expansion valve, king valve, and sea water valve are not directly involved in the process of starting up a reciprocating compressor. Manipulating those valves would not prevent liquid slugging in the compressor.