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Keckley Style TDV triple duty valves are primarily required on the discharge side of a centrifugal pump in a hydronic heating or cooling system. The Style TDV functions as a shut-off valve, spring loaded silent check valve, and balancing valve. Read more.

The Keckley Style TDV has an automatic and silent operation. The disc will open when the line pressure is approximately 1/4 PSI. As the line pressure approaches zero, the spring will close the disc to prevent flow reversal and water hammer. The flow through the valve can be adjusted from bubble tight shut-off to full flow by the acme rising stem.

The center guided soft seal disc ensures that there is no leakage. The rising stem design includes an adjustable position indicator for accurate disc positioning for throttling service. The unit comes with a standard gauge taps at both the inlet and outlet sides and a NPT drain plug.

Keckley Style TDV’s are constructed from rugged cast iron castings that are machined to exacting specifications. These bodies have drilled flanges that are in accordance with ASME B16.1. Keckley Style TDV’s can be supplied in other body materials: Carbon Steel and Stainless Steel upon request.

Triple Duty Valves

Cast Iron (ASTM A 126, Class B)

Image	Size Range	Pressure Class	End Connection	Style	Catalog Page	Submittal Drawing	Pressure Drop Chart	IO&M
	2" - 20"	125	Flange	TDV