Rotary shear injector valve with coated stator surface

摘要

A valve includes a rotor and a stator. The rotor and the stator each have seal surfaces for contacting and sliding against one another during operation of the valve. Either or both of the rotor and the stator have a seal-surface coating formed by depositing an at least partially amorphous interlayer on a substrate and depositing a surface layer, including diamond-like carbon, on the interlayer. The surface layer requires no mechanical polishing.

主权项

1. A chromatography valve, comprising:
a rotor comprising a rotor substrate; and a stator comprising a stator substrate, and having a contact surface in slidable contact with a contact surface of the rotor, wherein either or both the rotor and the stator further comprise a contact-surface coating comprising an at least partially amorphous interlayer adjacent to the contact surface, the interlayer comprising silica and having a thickness in a range of about 0.3 μm to about 0.5 μm, and a surface layer comprising diamond-like carbon on the interlayer, the surface layer having an unpolished contact surface, the unpolished contact surface having an average roughness (Ra) of approximately 0.025 μm or less.