A valve arrangement with a differential pressure controller

A valve arrangement for controlling fluid flow, comprising:

• a valve body having a valve inlet and a valve outlet, and
• a differential pressure controller comprising a movable membrane having a first membrane side and a second membrane side arranged on an opposite side to the first membrane side, wherein the first membrane side is arranged in fluid communication with the valve inlet, and wherein the second membrane side is arranged in fluid communication with the valve outlet, the differential pressure controller further comprising a spring element arranged to exert a force on the movable membrane and arranged to hold the movable membrane in an end position when a differential pressure between the first and the second membrane sides is below a threshold value, wherein the differential pressure controller is configured such that the movable membrane is movable in response to the differential pressure when the differential pressure is above the threshold value, and such that movement of the movable membrane counteracts pressure variations between the valve inlet and a valve outlet,
• wherein the valve arrangement further comprises an inspection passage configured to receive fluid from the valve inlet or the valve outlet when the differential pressure is above the threshold value, and wherein the differential pressure controller is configured to close the inspection passage when the differential pressure is below the threshold value, wherein presence of fluid in the inspection passage is indicative of the differential pressure being above the threshold value.