Boiler Surface Blowdown Valves

Surface blowdown valves (also known as a continuous blowdown valves) are critical to the efficient functioning of boilers and steam systems. These valves must discharge enough boiler water to prevent accumulating dissolved solids from causing carry-over into the steam distribution system. Because the surface blowdown valve is releasing high pressure boiler water, it is critical that it withstand damage from flashing and wiredraw.

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What is the purpose of Boiler Surface Blowdown Valves?

A surface blowdown valve (also known as a continuous blowdown valve) removes total dissolved solids (TDS) from inside boilers.

Dissolved solids are introduced to the boiler through raw makeup water. As the water flashes into steam within the boiler, it leaves behind dissolved solids. High concentrations of dissolved solids prevent steam bubbles from bursting as they reach the water surface in the boiler causing bubbles and foam to carry-over into the steam distribution system. Carry-over water contains suspended solids causing scale in heat exchangers, valves, regulators, and steam traps. Carry-over water in steam distribution piping can also cause water hammer damage.

Media and Case Studies

Whitepaper

Maximizing System Efficiency through Effective Blowdown

Ensuring high quality steam, reliable, and long-lasting boiler

Proven Result

State-Owned Oil & Gas Company Streamlines Shutdown, Turnaround and Outage EventsSaves on Maintenance and Manhours Costs with the Yarway Hy-Drop® 5800 Throttling Valve

The Yarway Hy-Drop 5800 throttling valve is specifically designed for continuous blowdown application, learn more here

Video

HRSG Feedwater and Steam Valve Operation Overview

Overview of HRSG operation from the boiler feed pumps through the high pressure steam outlet with a brief discussion on critical control valve applications in each system.

Additional Resources

Product Brochure: Blowoff and Blowdown Valves Flier

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Brochure: Liquid Analytical Solutions

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Brochure: Improve Boiler and Steam Distribution Efficiency

Realize large savings in fuel usage and emissions reductions by improving your boiler and steam system performance