What type of couplings connect piping in hydraulic elevator systems?

Flanged couplings are the correct choice for connecting piping in hydraulic elevator systems due to their ability to provide a strong, leak-proof connection that is essential for the high-pressure conditions typically present in hydraulic systems. These couplings consist of two flanges that are bolted together, allowing for easy assembly and disassembly when maintenance or inspection is required. This convenience is particularly important in elevator applications where accessibility and reliability are critical aspects of safety and performance.

Additionally, flanged couplings accommodate thermal expansion and various alignment issues that can arise in hydraulic systems. They allow for a secure joint without compromising the integrity of the piping under dynamic operational conditions. This is why flanged couplings are widely preferred in hydraulic elevator installations over other types of couplings that may not offer the same level of reliability or ease of access.