b'WAFER PATTERN CHECK VALVES - ASG & AGW STYLE1 . 0 I N S T A L L A T I O NPiping should be properly aligned and supported to reduce mechanical loading on the end connections.Install valve in system using proper size and type of mating flanges and appropriate gaskets (for FF or RF)or ring joint gaskets (for RTJ). Observe the following precautions:Do not install ASG/AGW series wafer check valves directly against another valve whereby the check valve discharges downstream directly into another valve. Do not install the valve whereby it directly discharges downstream into a tee or elbow fitting. Refer to Diagram 1. ASG/AGW check valves are not suitable for vertical downflow installations.1.1 INSTALLATION POSITIONS Check valves are unidirectional and have the direction of flow indicated on the valve body.Supercheck dual flap check valves are recommended for use only in horizontal lines and vertical lines for upwards flow only.1.2 PREPARATION FOR INSTALLATIONRemove protective end caps or plugs and inspect valve ends for damage to flange faces.Thoroughly clean adjacent piping system to remove any foreign material that could cause damage to seating surfaces during valve operation.Verify that the space available for installation is adequate to allow the valve to be installed.1.3END CONNECTIONS1.3.1 Flanged EndsCheck to see that mating flanges are dimensionally compatible with the flanges on the valve body and ensure sealing surfaces are free of debris.Install the correct studs and nuts for the application and place the gasket between the flange facings.Stud nuts should be tightened in an opposing criss-cross pattern in equal increments to ensure even gasket compression. See Diagram 5.4 Australian Pipeline Valve - Installation, Operation and Maintenance Manual'