Poppet valve

A poppet valve for regulating a pressure of a fluid in a passage, the valve including:

• a casing arrangeable such that the fluid in the passage flows over an outer side thereof;
• a piston axially slidably positionable within the casing, and configured such that the axial position of the piston regulates the fluid pressure in the passage downstream of the poppet valve, an annular clearance being provided between the piston and the casing;
• a dynamic seal located between the piston and the casing to seal an end of the annular clearance;
• and
• a piston chamber located on an opposing side of the dynamic seal to the annular clearance such that a leakage flow of the fluid may cross the dynamic seal between the annular clearance and the piston chamber, the pressure of fluid in the piston chamber being usable to vary the axial position of the piston within the casing;
• wherein a diversion path formed in the casing diverts fluid for the leakage flow into the annular clearance from the fluid flow in the passage, the diversion path having a filter to filter debris from the diverted fluid.