1. Selection Principles Of valves For Use In Water Supply Pipelines
1) When the diameter of the pipe is not more than 50mm, ball valve should be used, while when the diameter of the pipe is more than 50mm, gate valve and butterfly valve should be used
2) When flow and water pressure need to be regulated, use regulating valve and cut-off valve
3) Requests the water flow resistance small spot (like the water pump suction pipe on), appropriate uses the gate valve
4) The flow of water to the two-way flow of the pipe should be used on the gate valve, Butterfly Valve, not to use the cut-off Valve
5) Installation space small parts appropriate to Use Butterfly Valve, Ball Valve
6) In the regular opening and closing of the pipeline, the appropriate use of cut-off Valve
7) The multi-function valve should be used on the outlet pipe of large caliber water pump
2. The Valve Position On The Water Supply Pipeline
1) The water supply pipe of the residential quarter is from the leading pipe section of the municipal water supply pipe
2) Residential area outdoor ring pipe network node, should be set according to the separation requirements. When the annular pipe section is too long, the sectional valve should be set
3) The branch pipe or the household pipe which is connected from the main water supply pipe in the residential quarter
4) Inlet pipe, water meter and branch standpipes (bottom of Standpipe, top and bottom of vertical loop standpipe)
5) Branch pipe of ring pipe network and connecting pipe of branch pipe network
6) Indoor water supply pipe to the households, public toilets, etc. connected to the water distribution pipe start, water distribution branch on the water point in 3 and more than 3 set
7) Pump outlet pipe, self priming pump suction pumo
8) The inlet, outlet and outlet pipes of the water tank
9) Water supply pipes for equipment (E. G. Heaters, cooling towers, etc.)
10) Water distribution pipes for sanitary appliances such as urinals, toilets, washbasins, showers, etc.
11) Some accessories, such as automatic exhaust valve, pressure relief valve, water hammer eliminator, pressure gauge, sprinkler, etc. before and after the valve and backflow preventer
12) The lowest part of the water distribution system should be installed a drain valve
3. Selection Of Check Valves
Check valve should generally according to its installation site, valve before the water pressure, closed after the performance requirements and closed the water hammer caused by the size of factors to choose:
1) Before the valve water pressure hour, should choose swing type, ball type and shuttle type check valve
2) After the closure of the tight performance requirements, it is appropriate to choose a closed spring check valve
3) Request to weaken the closed water hammer, should choose the quick-closing sound-reducing check valve or damping device slow-closing check valve
4) Check Valve Valve or Spool, should be able to gravity or spring under the action of self-closing
4. Installation Of Check Valves In Water Supply Pipelines
On the inlet pipe; on the inlet pipe of a closed water heater or water-using device; on the outlet pipe of a pump; on the outlet pipe of a cistern, tower, or highland cistern where the inlet and outlet pipes share a single pipe.
Note: No check valve is required for pipe sections with piping backflow preventer.
5. The Location Of The Air Exhaust Device Installed In The Water Supply Pipeline
1) Intermittent use of water supply pipe network, the end of the pipe network and the highest point should be set up the automatic exhaust valve
2) The pipe section with obvious undulation and accumulation of air in the water supply network has been equipped with an automatic exhaust valve or manual valve at the peak point of the section
3) Air pressure water supply device, when the use of automatic air supply type air pressure water tank, the highest point of the water distribution network should be set up the automatic exhaust valve
Post time: Jul-28-2021