VNN 404 FC/FO

Description:

The VNN 404 FO/FC is a high-performance, fail-open/fail-close gas pressure regulator designed for large-scale energy, industrial, and transmission applications. With its pilot-operated design and robust diaphragm assembly, it provides dependable pressure control in systems operating at pressures up to 102 bar. Engineered for ease of maintenance and long service life, the VNN 404 FO/FC comes can be equipped with optional integrated silencers. Ideal for installations requiring guaranteed opening in case of failure (FO model), it delivers excellent control stability and accuracy under dynamic conditions.

Features:

• Fail-close function as standard version (fail-open by request)
• Safety mechanism according to EN 334 standard
• Rated for inlet pressures up to 102 bar
• Outlet pressure range from 2 to 80 bar
• Differential pressure as low as 2 bar required for regulation
• Top-entry design simplifies inspection and servicing
• Available in sizes DN 100 to DN 200
• Can be provided with an optional differential pressure pilot for Flow Limitation System
• Can be provided with an optional internal silencer