System for the control of a flow of liquid between a first reservoir and a second reservoir

System for controlling a flow of liquid from a first reservoir to a second reservoir when the system is in use, the system comprising:

• an intermediate reservoir having an inlet configured to be in fluid communication with the first reservoir and an outlet configured to be in fluid communication with the second reservoir when the system is in use,
• a valve arranged at the inlet and configured to move between:
• an open position in which liquid can flow from the first reservoir to the intermediate reservoir via the inlet when the system is in use, and
• a closed position in which liquid cannot flow from the first reservoir to the intermediate reservoir when the system is in use,
• wherein the outlet is designed and arranged so that the liquid level in the intermediate reservoir is the same as in the second reservoir when the system is in use,
• wherein the valve comprises a float that is configured to float on liquid present in the intermediate reservoir when the system is in use and thereby control the position of the valve dependent on the liquid level in the intermediate and second reservoirs, and
• wherein the valve is configured to, when the system is in use:
• open the inlet when the liquid level in the intermediate and second reservoirs is below a predetermined level, and
• close the inlet when the liquid level in the intermediate and second reservoirs is at or above the predetermined level, the closing being provided by the buoyant force of the float moving a closing surface of the valve into a liquid tight engagement with the inlet thereby providing a liquid tight closure between the first and intermediate reservoirs.