Description: Consumable part of reciprocating‑compressor piston assembly. Installed into ring grooves of second‑stage piston. Reciprocates together with piston inside second‑stage cylinder to seal clearance between piston and cylinder liner, suited for second‑stage high‑pressure hydrogen compression.
Seals the clearance gap between piston and cylinder‑liner inner wall, preventing high‑pressure‑hydrogen leakage from compression chamber towards crankcase, securing second‑stage compression pressure and gas‑delivery capacity. It scrapes trace lubricating‑oil deposits off cylinder‑liner surface, reduces oil carry‑over within hydrogen stream and assists piston heat dissipation.
‑ Split open‑ring profile; reserved ring‑gap compensates thermal expansion.
‑ For high‑pressure hydrogen service: self‑lubricating filled‑PTFE composite material; wear‑resistant and hydrogen‑embrittlement‑resistant, suitable for high‑pressure alternating‑load service. Usually multiple rings are stacked in combined arrangement.
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