1. Valve position can not be away from the hardened zone, or planting of new green space irrigation can not close the valve. This is common in green design flaw.
2 choose a wrench or runner can take down the valve, and then take the runner in time to prevent outsiders from opening the valve.
3 valve well should be small, not large, with no effect on the replacement of the valve should be appropriate.
4 for winter antifreeze, the valve should be less than the valve well, so as to seal or fill in the insulation material.
5 valve vertical pipe to use cement inlay, to prevent the replacement of the lower part of the valve when the riser.