03107 - Introduction 36min Which device is used to prevent the reverse flow of refrigerant? flow switch check valve pressure-relief valve receiver

## Step 1<br />The problem is asking us to identify the device that is used to prevent the reverse flow of refrigerant in a refrigeration system. The options provided are: flow switch, check valve, pressure-relief valve, and receiver.<br /><br />## Step 2<br />A flow switch is a device that is used to detect the flow of refrigerant in a refrigeration system. It does not prevent the reverse flow of refrigerant.<br /><br />## Step 3<br />A pressure-relief valve is a safety device that is used to release excess pressure in a refrigeration system. It does not prevent the reverse flow of refrigerant.<br /><br />## Step 4<br />A receiver is a storage tank for refrigerant in a refrigeration system. It does not prevent the reverse flow of refrigerant.<br /><br />## Step 5<br />A check valve, on the other hand, is a device that is used to prevent the reverse flow of refrigerant in a refrigeration system. It allows refrigerant to flow in one direction only, preventing it from flowing back in the opposite direction.