1. For a plug and socket connection, select a plug and socket with the same body size. If their body sizes are different, they cannot be connected. This will cause leakage, damage, and disconnection of the plug. Inserting a plug other than the specialized plug into the socket may result in equipment damage. 2. Do not use in locations where the connecting threads and tubing connection will slide or rotate. The connecting threads and tubing connection will come apart under these conditions. 3. Do not use couplers with flammable, explosive, or toxic substances, such as gas, gas fuel, and refrigerant. They may leak from inside the tubing to the outside. 4. Operate with a surge pressure of no more than the maximum operating pressure. If the surge pressure exceeds the maximum operating pressure, it will cause damage to couplers and tubing. 5. Do not use the S coupler with steam. Corrosion of the metal material and deterioration of the sealing material may result from long-term use with steam. 1. Make sure to confirm the specifications. Please do not use with pressures or temperatures outside the range of specifications, as this may result in damage and malfunction (Refer to specifications). SMC takes no responsibility for damage incurred by use in excess of the specification range. 2. Prohibition of disassembly and modification Do not disassemble or modify (including additional machining) the main body. False use may cause an injury or accident. 3. Confirm that PTFE can be used in application. Thread sealant contains PTFE (polytetrafluoroethylene) powder. Confirm if the use of it may cause any adverse effect in the system. 4. Cannot be used as a stop valve that requires zero leakage. A certain amount of leakage is allowed during operation. 5. Series KK and Series KKH cannot be connected with Series KKA. Also, SMC’s S coupler cannot be connected with quick couplers of other brands. This will cause leakage, damage, and disconnection of the plug. With series KK13, manufactured by RECTUS AG, verify the manufacturer of applicable couplers before use. 6. Do not couple or uncouple the S coupler during pressurization or while residual pressure remains. The coupler may shoot out under the influence of the pressure. 7. Never apply pressure to an S coupler without check valve when it is uncoupled. The piping may move violently and cause danger. 8. An S coupler without check valve experiences leakage of fluid inside piping when it is uncoupled. Pay special attention in using fluid that can cause danger such as fluid of a high temperature and pressure. Additional use of a stop valve is recommended. 9. The S coupler is heated when used at a high temperature. Take precautions not to touch it since touching it can cause burns. 1. Mount and operate the product after reading the instruction manual carefully and understanding its contents. Also, keep the manual where it can be referred to as necessary. 2. Ensure sufficient space for maintenance. Be sure to allow the space required for maintenance and inspection. 3. Tightening torque When installing the products, please tighten the screw with the recommended tightening torque. 4. During use, tube deterioration or damage to fitting can result in disconnection of the tube from the fitting and uncontrollable behavior of the tube. To stop the tube from going out of control, use a protective cover or fix the tube in place. 5. Do not use couplers where rotation normally occurs. The couplers may be damaged. 6. Avoid applications in which vibration or shock is directly applied to the fittings. 7. Fittings with sleeve lock mechanism must be locked during operation in order to prevent sudden disconnection. 8. Install a stop valve at the supply pressure side of the socket. Emergency shutdown may not be possible without it. 1. Preparation before piping Before piping is connected, it should be thoroughly blown out by air (flushed) or washed to eliminate cutting chips, cutting oil, and other debris from inside the pipe. 2. Wrapping of pipe tape When screwing in the pipes or fittings, make sure to prevent cutting chips or the sealing material on the threaded portion of the pipe from entering the piping. Also, if pipe tape is used, leave about 1 thread ridges exposed at the end of the threads. 3. Before mounting confirm the model and size, etc. Also, confirm that there are no blemishes, nicks or cracks in the product. 4. When connecting a tube, consider factors such as changes in the tubing length due to pressure, and allow sufficient leeway. 5. Mount so that couplers and tubing are not subjected to twisting, pulling or moment loads. This can cause damage to couplers and flattening, bursting or disconnection of tubing, etc. 6. Mount so that tubing is not damaged due to tangling and abrasion. This can cause flattening, bursting or disconnection of tubing, etc. Wrapping direction Pipe tape Leave approximately one length of screw exposed S Couplers Specific Product Precautions 1 Be sure to read before handling. Refer to front matter 56 for Safety Instructions and pages 13 to 16 for Fittings and Tubing Precautions. Selection Mounting Warning Warning Caution Caution 181 KQ2 KQB2 KS KX KM KF M H/DL L/LL KC KK KK130 DM KDM KB KR KA KQG2 KG KFG2 MS KKA KP LQ MQR T