which are preferred for permanent

the 100208491 is the manufacturer-designated replacement for the obsolete RLY2052 and RLY2052K series

As a direct replacement for 22-100000-551

Durable Construction: Rated for high-temperature water and chilled systems

Siemens Building Technology 599-02012 Valve 321894-709 which are preferred for permanentThe Siemens Building Technology 599 02012 is a professional grade 2 way normally closed globe valve designed for precision control in terminal unit applications. Built with a heavy duty forged brass body and brass trim, this 3 4" NPT valve is engineered for high demand HVAC systems utilizing hot water, chilled water, or 50% glycol solutions. For contractors requiring accurate modulation, the unit features a 6. 3 Cv flow coefficient with a modified