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Winding direction Pipe tape Expose approx. 1 thread Connection thread size (R, NPT) 3 to 5 8 to 12 15 to 20 20 to 25 28 to 30 36 to 38 40 to 42 48 to 50 48 to 50 Proper tightening torque (N・m) 1 1 1 2 1 8 1 4 3 8 1 2 3 4 1 4 1 2 1. Refer to the Fittings and Tubing Precautions (pages 44 to 47) for handling One-touch fittings. 2. Preparation before piping Before piping is connected, it should be thoroughly blown out with air (flushing) or washed to remove chips, cutting oil and other debris from inside the pipe. 3. Wrapping of pipe tape When screwing piping or fittings into ports, ensure that chips from the pipe threads or sealing material do not enter the piping. Also, if pipe tape is used, leave 1 thread ridge exposed at the end of the threads. 4. Closed center and double check valve types For closed center or double check valve types, check the piping to prevent air leakage from the piping between the valve and the cylinder. 5. Connection of pipings and fittings When screwing the piping or fitting into the valve, tighten it as follows. 1) When using SMC’ s M3, M5, M6, or 10-32UNF fitting, follow the procedures below to tighten it. Connection thread: M3 First, tighten by hand, then use a wrench appropriate for the hexagon flats of the body to tighten an additional 1/4 turn. A reference value for the tightening torque is 0.4 to 0.5 N・m. Connection thread: M5 and 10-32UNF First, tighten by hand, then use a wrench appropriate for the hexagon flats of the body to tighten an additional 1/6 to 1/4 turn. A reference value for the tightening torque is 1 to 1.5 N・m. M6 First, tighten by hand, then use a wrench appropriate for the hexagon flats of the body to tighten an additional 1/6 to 1/4 turn. Note) Excessive tightening may damage the thread portion or deform the gasket and cause air leakage. Insufficient tightening may loosen the threads, or cause air leakage. When using a fitting other than SMC fitting, follow the instructions given by relevant fitting manufacturer. 2) For the fitting with sealant R or NPT, first, tighten it by hand, then use a wrench appropriate for the hexagon flats of the body to tighten it a further two or three turns. For a tightening torque guide, refer to the table below. Caution Caution Design/Selection Piping Warning 1. Operation manual Install the products and operate them only after reading the operation manual carefully and understanding its contents. Also, keep the manual where it can be referred to as necessary. 2. Ensure sufficient space for maintenance activities. When installing the products, allow access for maintenance. 3. Tighten threads with the proper tightening torque. When installing the products, follow the listed torque specifications. 4. If air leakage increases or equipment does not operate properly, stop operation. Check mounting conditions when air and power supplies are connected. Initial function and leakage tests should be performed after installation. 5. Painting and coating Warnings or specifications printed or affixed to the product should not be erased, removed or covered up. Please consult with SMC before applying paint to resinous parts, as this may have an adverse effect due to the solvent in the paint. Mounting 6. Operation in a low temperature condition It is possible to operate a valve in extreme temperature, as low as .10°C. Take appropriate measures to avoid freezing of drainage, moisture etc. in low temperature. 7. Operation for air blowing When using a solenoid valve for air blowing, use an external pilot type. Use caution because the pressure drop caused by the air blowing can have an affect on the internal pilot type valve when the internal pilot type valves and external pilot type valves are used on the same manifold. Additionally, when compressed air within the pressure range of the established specifications is supplied to the external pilot type valve’s port, and a double solenoid valve is used for air blowing, the solenoids should normally be energized when air is being blown. 8. Mounting orientation Rubber seal: Refer to the specifications of each series. Please consult with SMC for models not indicated in the specification column. Metal seal: Mounting orientation of a single solenoid is universal. No specific orientation is necessary. When installing a double solenoid or a 3-position configuration, mount the valve so that spool valve is horizontal. 9. Initial lubrication of main valve The following initial lubricant has already been applied to the main valve. Rubber seal, spool valve: Grease Please consult with SMC, as there are some standard valve products that use fluorine grease for food processing equipment (NSF H-1). Metal seal, spool valve: Turbine oil Turbine oil is applied to the spool valve of a metal seal type. Therefore, turbine oil may seep out when a new product is delivered, or while the valve is stored. 3/4/5 Port Solenoid Valves Precautions 4 Be sure to read this before handling. 5 B