242 3. Notes for commissioning of pipe 1) General precautions ● Secure an adequate space for maintenance and inspection. ● Test completed items with hydraulic pressure. (Airtight test using air (gas) is very dangerous.) ● When a positive pressure gas is used for our resin pipe, note that a dangerous situation may occur due to the reaction force peculiar to compressed fluids even when the pressure is the same as the hydraulic pressure. Always take appropriate measures to ensure the safety of surrounding area, such as coating the pipe with a protecting material. If you have any uncertainty, please contact us. After the completion of piping work, perform a leak test of the conduit with hydraulic pressure. If it is inevitable to perform a test with air, be sure to consult our nearest sales office in advance. ● Avoid using in places that are constantly exposed to water, dust or direct sunlight. Or, cover the whole product. (The valve may become unable to work properly.) ● When using the valve in unfavorable conditions, it is recommended to cover the whole valve with a protective plastic bag. The automatic driving parts, in particular, may have a malfunction due to corrosion. ● When supporting the pipe with a U-band, be careful not to overtighten. (It may cause breakage.) ● Before starting the work, be sure to perform safety check of mechanical and electric tools to be used. ● During piping work, always use protective equipment appropriate for the work. (Failure to do so may cause injury.) ● During installation, be careful not to give a forcible stress, such as tension, compression, bending and impact, on the piping and valves. ● Before replacement of valve or parts, completely remove the fluid from the pipe. If the fluid cannot be removed, reduce the fluid pressure to zero. 2) Notes for connection of true union type ● During piping installation, assembly or disassembly, steady the end connector. ● Before a water flow test, be sure to check that the union nut is securely tightened. ● When tightening the union nut, pay attention to axial-center misalignment and face-to-face dimensions. ● When connecting a resin valve to a metal pipe, be careful that piping stress is given to the resin valve. ● Do not over-tighten the union nut. (It may cause breakage.) 3) Notes for connection of flange ● Ensure that the parallelism and axial-center misalignment dimensions do not exceed the values below. (Failure to do so may cause breakage due to the stress given on the piping.) ● Tighten the bolts and nuts of the connection flange diagonally according to the specified torque. (Failure to do so may cause leak or breakage.) ● The connection flanges recommended to be flat face type. ● Check that the flange standard of both sides are not different. ● Be sure to tighten the flanges using sealing gaskets (AV packings), bolts, nuts, and washers, according to the specified tightening torque (except for butterfly valves). 4) Notes for connection of socket (bonding) type ● During installation at low temperatures, be very careful because the solvent fume is difficult to evaporate and liable to remain. (It may cause a solvent crack and resulting breakage.) After piping work, open the both sides of the pipe and ventilate the inside using a blower (of low pressure type) to remove the solvent fume. ● Do not apply too much adhesive. (Doing so may cause a solvent crack and resulting breakage.) ( AXIAL-CENTER MISALIGNMENT) (PARALLELISM) a b ( AXIAL-CENTER MISALIGNMENT) (PARALLELISM) a b Tighten until snug SIZE (mm) AXIAL-CENTER MISALIGNMENT PARALLELISM 40 . 80 1.0mm 0.8mm 100 . 150 1.0mm 1.0mm 200 . 600 1.5mm 1.0mm