A collegue told  that Lift Plug valves are, in some processes, good alternatives for ball or gate valves as they are full bore, pressure tight and do not wear whilst being turned. It is hard to determine how pressure tight a valve is in all conditions, but these are said to shut off better than gate valves.Other pumps

Anyone experienced with these lift plug valves or knows in which industries/process they are commonly used?Cast Gate, Globe, Check Valves

This is similar to what is happening in double eccentric ball valves. Except that here the the closing element is a full bore ball, with seat sealing ring mounted on the ball itself. In full open position the sealing is turned 90 degrees away from main flow, and the ball has both a full port and in addition a flow around the ball against the wall to get grit away.forged Gate, Globe, Check Valves

The eccentric plug valve is a available on the market, althoug not that common, the use mainly restricted by sealing properties and cost.Ball Valves The soft sealings will have good and waterthight properties, when metal poorer.

Mostly other types of quality valves will be selected as 'good enough' and cheaper. The price of the valves will often be above other types of valves.

One segment of use is large valves for waste water with large gate valves or knife-gate valves as competitors.

The plug valve will cost considerably more, but will have (in top quality) a very long standtime.

Just stumbled accross your thread deep into a Google search for something else ... I'm a valve guy ... albeit Non-Industrial, i.e. Municipal Water & Wastewater and Hydro.  Been around a long time.  I believe what your colleague was likely referring to is the metal to metal conical plug valve more commonly known as the cone valve.  Been around since 1926 as a pump control/check valve for controlling discharge of large pumps used in the water and wastewater industries.Resilient Seated Gate Valves  Employs a traveling nut type valve operating mechanism that firsts lifts the conical plug off its seats, then rotates the plug 90 degrees and finally lowers the plug back into the seats.  It's close cousin is the AWWA ball valve both metal to metal seated as well as rubber seated.

MORE NEWS