Pressure reducer for animal drinking troughs, and method for adjusting at least one pressure reducer for animal drinking troughs

A pressure reducer (15) for animal drinking troughs, comprising:

• a housing (16) in which a membrane (17) is provided, said membrane dividing the housing (14) into
• a liquid chamber (20) for liquid for supplying the animal drinking troughs, and
• a chamber (21) having an adjustable regulating device (33) acting on the membrane (17);
• and
• a regulating valve which is actuatable by the membrane (17) and is assigned to an inlet (27), opening in the liquid chamber (20), for liquid from a liquid supply,
• wherein the regulating device (33) is actuatable and/or adjustable with the liquid of the liquid supply, and
• wherein the regulating device (33) has at least one hydraulically prestressable spring member having an upper end (35) and a lower end (36), wherein the lower end (36) of the at least one hydraulically prestressable spring member is hydraulically prestressable by the liquid of the liquid supply, and the upper end (35) of the at least one hydraulically prestressable spring member acts on the membrane (17) by pressing against the membrane (17).