A specification for control valves on water pipes (600mm to 800mm dia) working to control flow into a tank with up to 100m upstream pressure (cavitating conditions) calls for "Piston Type Valves" (this refers to valve type not the actuator type). What is a "Piston Type Valve" ?
It never ceases to amaze me the denominations that people use for valves, it seems that people out there just pick arbitrarily names to describe valves or they use a non technical dictionary to traduce a valve name into English.
Fortunately the valve industry in America is well developed and has standardized on generic names for all types of valves.
A piston valve has its rooters in a piston pump and later developed into a valve.
Today this design, originally developed in 1922, by Richard Klinger who invented the piston valve by replacing the disk and seat of a conventional globe valve with a cylindrical piston and two resilient, replaceable
To my knowledge the above design of Piston valves are not manufactured above 12" (300mm.)
In waterworks sometimes Plug or Cone valves are referred as piston valves. The most recognize manufacturer for this type of applications is Henry Pratt, they make both a Cone and a Plug valve. Although in my opinion their Cone valve is a plug and their Plug valve is relay not a True Plug, but more like a C-Ball Valve or you can call it a C-Plug.

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