The Reznor 257051 Venter Assembly (Model SHH350) is a critical OEM replacement component engineered for high-capacity power-vented gas-fired duct furnaces

This model includes a mechanical spring-wound carry-over

Built as a 1-phase (1Ph) component

Utilizing a robust diaphragm and high-grade electrical contacts

making it the standard path for modernization without repositioning field wiring

Siemens Building Technology 599-03078 Valve 318172-701 The Reznor 257051 Venter AssemblyThe Siemens 599 03078 is a high performance 1 1 4" NPT 2 way normally closed globe valve engineered for precise modulation in commercial HVAC and industrial steam applications. Built with a heavy duty UNS CA 844 bronze body and 316 stainless steel trim, this valve is designed to withstand the rigors of saturated steam and high temperature water systems up to 337F. With a 16 Cv flow coefficient and a linear flow characteristic, it provides stable