Australian Pipeline Valve - Installation, Operation and Maintenance Manual 8 API6D THROUGH CONDUIT EXPANDING GATE VALVE - AP400-405 SERIES f- APV’s preference is that through conduit gate valves be installed in the vertical direction. The horizontal orientation is acceptable as shown below. g- During commissioning and pipeline flushing, the valve must remain in the full-OPEN position to prevent damage to the internal parts. Impurities and foreign debris entering the valve body may cause damage to sealing surfaces resulting in malfunction. Install the gate valve with the gate segments in the OPEN POSITION. The preferred pressure side of the valve MUST BE INSTALLED TO THE UPSTREAM PIPE as shown below. Note It may be necessary to adequately support valve actuation in order to protect the valve and/or actuator from improper weight distribution and excess stress. To ensure actuation mounting and supports are adequate during operation, please contact APV before mounting and installation. Thermal Relief Assembly MUST vent to the UPSTREAM side of the valve. DOWNSTREAM PREFERRED FLOW DIRECTION UPSTREAM CORRECT CORRECT INCORRECT CORRECT CORRECT INCORRECT CORRECT CORRECT INCORRECT