Drain Control Valve

Function

Drain control valves are engineered to safely and efficiently remove water or boiling water from the boiler flash tank during startup or low-load operations. In Benson boilers, the valve functions as a startup valve, precisely maintaining a constant water level within the startup flash tank. To maximize efficiency, the discharged water can be reintegrated into the system cycle via three distinct pathways:

Recirculation system: Seamlessly routed through the recirculation pump and the recirculation control valve.
Atmospheric expansion: Discharged into the flash tank at atmospheric pressure.
Feedwater integration: Directed straight into the feedwater tank.

Design

Forged angle-pattern valves, featuring butt-weld ends in compliance with DIN, ANSI, or other international standards.

Benefits

Designed for minimal cavitation and erosion.
Customized, high-precision flow characteristics tailored to your specific application.
Engineered for near-zero oscillation and vibration.
Unbalanced valve design
(Please note: Balanced valves are not recommended for flashing applications, as flashing within the balancing area can lead to severe component damage.)
Angle-pattern design
(The angle configuration actively prevents the two-phase flow from impacting the bottom of the valve body, significantly reducing wear and tear.)
Expanded valve outlet
Outlet size is 2 to 3 nominal sizes larger than the inlet diameter.
(This expanded outlet area effectively reduces the velocity of the two-phase mixture and facilitates the smooth discharge of the steam volume.)
Application-specific material selection for all wetted internals, combined with specialized design features for the valve seat and trim to maximize service life.
Fully replaceable internals for quick and easy maintenance.