VALVE ARRANGEMENT AND TRAFFIC CALMING DEVICE INCORPORATING SUCH AN ARRANGEMENT

摘要

VALVE ARRANGEMENT AND TRAFFIC CALMING DEVICE INCORPORATING SUCH AN ARRANGEMENT A fluid flow control valve arrangement comprising at least a first and a second valve wherein the first valve includes a first valve closure, movable against a first biasing means from its natural open state to a closed state, and wherein the second valve includes a second valve closure, movable against a second biasing means from its natural closed state to its open state such that the application of fluid pressure on the control valve assembly below a first lower threshold level or above a second higher threshold level allows a flow of fluid through the valve arrangement but an application of fluid pressure on the control valve between said first and second threshold levels allows substantially no fluid to flow through the valve arrangement.