8 1 2015 BRG PREMANT district heating pipe PRE Subject to technical changes Fittings installed in the ground Description installation and operating instructions 6 325 General We only provide systematic heat insulation for ball valves if they are suitable for direct installation in the ground with or without pre stressing i e A if they fulfil the requirements acc EN 488 B if there are no screwed connectors in the insulated area Range of applications Up to 160 C 16 bar or 140 C 25 bar Processed deminer alized clean tap water with low oxygen content not suitable for installation in the area of bends and expansion limbs Material Housing made of steel forged and welded Ball in stainless steel Switching spindle in stainless steel Seals in reinforced Teflon Ball seal spring supported Spindle seal multiple Monitoring wire foamed in Heat insulation made of rigid PUR foam HDPE casing Delivery and storage Ball valves in open position Protective caps on both pipe ends Assembly installation Only weld in the ball valves in the open position and protect the housing against overheating while doing so Install expansion pads in the area of the dome as per the instructions Pay special attention to ensure that the dome has sufficient freedom of movement The upper uninsulated section of the spindle must not stand in the groundwater other water The first switching operation must only take place after the pipe has been flushed through open the gate valve first If there is a risk of frost uncovered fittings must be completely emptied Thoroughly grease the steel parts on the dome If there is a provisional pipe end the free pipe end must be welded shut Position indicator Milled in notch on switch spindle square and pointer Activation Close by turning to the right clockwise as far as the stop 90 for ball valve Operation Matching socket wrenches must be used for switching Plug on gears with matching receiver components can be supplied for ball valves our recommendation for DN 200 and above Do not apply force to the switching shaft Do not overtighten the end stops Intermediate positions are not allowed for ball valves due to the possbility of wear on the ball seals The processed tapwater must not contain any solid particles because they could damage the sealing surfaces Maintenance Periodically clean the steel parts on the dome and grease them thoroughly Switch between OPEN and CLOSED several times at least every 3 months until smooth running is achieved Check the freedom of movement of the dome Check the groundwater level and condition Important It is essential to follow the above instructions We and or the fittings manufacturer cannot provide any warranty for damage due to incorrect installation handling and maintenance

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