Z-tide Elite-Line is a Taiwan-based company that provides various valves for water treatment systems. Some specific features are important. First of all the connection sizes, up to 2 "wire connection but especially up to 14" flanged version. But also the design, a house with various functions: pressure reducing, relieving, and holding pressure function.
In addition, Z-tide provides, among other things, water hammer dampers and direct-acting pressure reducing valves.
Pilot Operated Valves with Piston
Pilot Operated Valves with Diaphragm