A Pressure Adjustment Apparatus

A pressure adjustment apparatus comprising a compartment () and a valve arrangement () for controlling the pressure of the compartment (). The valve arrangement () comprises an inlet (), for connecting the valve arrangement to a pressurised fluid source (), and an inlet valve (), for controlling the flow of fluid from the fluid source () into the valve arrangement (); an outlet (), for releasing fluid from the valve arrangement (), and an outlet valve (), for controlling the flow of fluid out of the valve arrangement (); a compartment port () by which the compartment () is connected to the valve arrangement (); and a compartment valve () for controlling the flow of fluid into and/or out of the compartment (). The compartment valve () is configured for simultaneous actuation to an open position with the inlet valve () and/or the outlet valve (), such that when either the inlet valve () or the outlet valve () is in an open position, the compartment valve () is in an open position, such that the flow of fluid into and/or out of the compartment () is allowed.