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This paper describes the development of a new sealing concept primarily targeted at steam turbines from concept development to testing in a rotating rig. The seal concept is a development of the spring back gland segment and features a pressurized pocket connected to the upstream face of the sealing segment. By a careful arrangement of the key dimensions of the seal segment a seal is produced that responds to rotor movement that it has a dynamic clearance that responds to rotor movement. This reduces the risk of contact between the rotating and stationary parts in a turbine and allows a lower clearance to be achieved reducing leakage losses. The seal was developed with steam turbine application as the design intent but the dynamic seal idea is a generic one and can be applied to other fields.