Came across a few Double check valves failing recently. Washing machine no water errors and outside tap with long hose connected same no water. Remove hose and open tap water flows ok. Re-connect hose ...no water. No blockage, no kink. Replaced washing machine valve to one without check valve and problem solved. Water pressure to property shows nearly 7 bar static. Pressure linked to check valves not working/locking up? Took hose off Washing machine and ran into a bucket fine, reconnect and locks up again. Changed 3 so far due to these issues on different properties. New valves too. Anyone came across this?