Sealing moving with piston in a high-pressure pump

摘要

A piston member (200) for a high-pressure pump (20) for pumping fluid in a sample separation apparatus (10), wherein the piston member (200) comprises a piston (202) configured for being mountable to reciprocate in a piston chamber (204) for displacing fluid, and a sealing (206) for sealing between the piston member (200) and the piston chamber (204) when the piston member (200) is mounted in the piston chamber (204) to reciprocate, wherein the sealing (206) is mounted on the piston (202) so as to reciprocate together with the piston (202).