2 Port Solenoid Valve For Dust Collector Series VXF2/VXFA2 Series VXF2/VXFA2 Specific Product Precautions 1 Be sure to read before handling. Refer to front matter 41 for Safety Instructions and pages 17 to 19 and the Operation Manual for 2 Port Solenoid Valves for Fluid Control. Please download it via our website, http://www.smcworld.com Silencer Caution 1. The silencer’s response properties do not change in the initial stage, but will change due to the blockage after long use. Replace it after using about 500,000 times. This number is subject to change based on fluid quality and energizing time. 2. When using a silencer, make space for silencer replacement. Design Warning 1. Cannot be used as an emergency shutoff valve etc. The valves presented in this catalog are not designed for safety applications such as an emergency shutoff valve. If the valves are used in this type of system, other reliable safety assurance measures should also be adopted. 2. Extended periods of continuous energization The solenoid coil will generate heat when continuously energized. Avoid using in a tightly shut container. Install it in a well-ventilated area. Furthermore, do not touch it while it is being energized or right after it is energized. 3. When the conduit type is used as equivalent to an IP65 enclosure, install a wiring conduit etc. Selection Warning 1. Air quality 1. Use clean air. Do not use compressed air that contains chemicals, synthetic oils including organic solvents, salt or corrosive gases, etc., as it can cause damage or malfunction. 2. Install an air filter. Install an air filter close to the valve on the upstream side. A filtration degree of 5 μm or less should be selected. 3. Install an aftercooler or air dryer, etc. Compressed air that contains excessive drainage may cause malfunction of valves and other pneumatic equipment. To prevent this, install an aftercooler or air dryer, etc. 4. If excessive carbon powder is generated, eliminate it by installing a mist separator on the upstream side of valves. If excessive carbon powder is generated by the compressor, it may adhere to the inside of the valves and cause a malfunction. Refer to Best Pneumatics No. 5 for further details on compressed air quality. Selection Warning 2. Ambient environment Use within the allowable ambient temperature range. Check the compatibility between the product’s composition materials and the ambient atmosphere. Be certain that the fluid used does not touch the external surface of the product. 3. Countermeasures against static electricity Take measures to prevent static electricity since some fluids can cause static electricity. 4. Low temperature operation 1. The valve can be used in an ambient temperature of between .20 to .10°C. However, take measures to prevent freezing or solidification of impurities, etc. 2. When using valves for water application in cold climates, take appropriate countermeasures to prevent the water from freezing in tubing after cutting the water supply from the pump, by draining the water etc. When warming by a heater etc., be careful not to expose the coil portion to a heater. Installation of a dryer, heat retaining of the body is recommended to prevent a freezing condition in which the dew point temperature is high and the ambient temperature is low, and the high flow runs. 5. Fluid properties Use a general compressed air with a filter of 5 μm or less mounted on the inlet of the piping. (Excluding dry air) AC coil: 5% or less of rated voltage DC coil: 2% or less of rated voltage Caution 1. Leakage voltage Particularly when using a resistor in parallel with a switching element and using a C-R element (surge voltage suppressor) to protect the switching element, take note that leakage current will flow through the resistor, C-R element, etc., creating a possible danger that the valve may not turn off. 2. The response performance and start-up speed deterriorate in case of air operated type (VXFA2) as compared with a solenoid type (VXF2) case. Refer to the data for pilot piping. 3. Note that for DC units, idle time and return time increase if the voltage is lowered. If a surge voltage suppressor is installed, the return speed decreases. R SOL. OFF Switching element C Leakage current Leakage voltage Power supply 301 VX2 VXK VXD VXZ VXS VXE VXP VXR VXH VXF2 VX3 VXA A