Plastic sub-catchment and the valve device works in the application of warm (b)

1.2 Product Requirements



Plastic sub-catchment 1.2.1 Design requirements



The backbone of the design requirements of plastic pipe should be in accordance with GB/T18991-2003 "hot and cold water systems and the use of thermoplastic pipe fittings" and related material of pipe product standards.



Connection with the pipeline should choose welding, bonding or mosaic pieces of the way, should not restrict the use of machinery connected to heating heating network in China.



1.2.2 Plastic valve design requirements



a) If the pressure valve has only one direction, the external body should be marked with the arrow, symmetrical design of the valve should be suitable for two-way flow of fluid and isolation.



b) sealing components driven by the stem to the gate valve action, should be the end or intermediate position by the friction of any device or execution of positioning, fluid pressure can not change its position.



c) in accordance with EN736-3, the smallest cavity valve hole should be in accordance with the following two points: 1. the valve on the flow of any medium aperture, the valve should not be less than 90% of the value of DN; 2. For the structure of the circulation need to narrow the aperture of the valve media, manufacturers should indicate the actual size of the smallest hole.



d) between the valve stem seal and shall be in accordance with EN736-3.



e) resistance in the valve, the valve should be designed to consider the life of wear parts, or manufacturer should be specified in the operation guide book recommended the replacement of the entire valve.



f) all valves to operate at a flow rate of the application devices should reach 3m / s.



g) from the top of the valve, the valve handle or hand wheel clockwise direction for the closure of the valve. 

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