Non-Lubricated Plug Valves
Non-lubricated plug valves are quarter-turn isolation valves that achieve the plug-to-body seal without injected grease, using instead a non-metallic liner, sleeve or polymer-coated plug. Eliminating sealant removes the re-greasing routine and, more importantly, avoids any grease contamination of the medium, which makes these valves the natural choice for clean, corrosive, highly toxic and high-purity service where leakage is strictly limited.
The seal is most often formed by a PTFE or PFA sleeve that lines the body taper (the sleeved sub-type), but lift-plug and fully-lined designs are also used. Because the soft seal does the sealing, non-lubricated plug valves give bubble-tight shut-off on aggressive chemicals and are common in chemical, petrochemical and fine-chemical plants. Design and testing follow API 599, ISO 15760 and MSS SP-78, generally across ASME Class 150-600 / PN 16-100 and sizes from about 1/2" to 12".
Bodies are typically CF8M (A351 SS316) or WCB carbon steel, with the wetted seal in PTFE, RPTFE or PFA; higher-corrosion duty uses Alloy 20, Hastelloy, Monot or fully PFA-lined carbon-steel bodies. End connections include flanged ANSI B16.5 RF, butt-weld, socket-weld and threaded NPT/BSP.
Operation is by lever or worm-gear, with pneumatic and electric actuation for remote service; fire-safe variants to API 607 can be specified where the seal arrangement permits. Himalay's MSME partners manufacture non-lubricated plug valves with testing per API 598 / BS EN 12266-1 / ISO 5208, material traceability, and PED-CE (EU), SABER (Saudi Arabia) and NACE MR0175 (sour service) coordinated as part of the standard order flow.
