Yamatake Corporation has developed an HVAC control valve for heat source applications – the ACTIVAL™ motorized two-way valve, high differential pressure series (large diameter). Sales will commence in February.

Valves for heat source applications must offer advanced flow rate control and the high performance/quality necessary for them to operate for extended periods in environments with high pressure differentials. With its high rangeability, this newly developed product is capable of operating reliably under such conditions thanks in part to the adoption of a design that resists erosion caused by cavitation.

Moreover, this new valve is extremely compact (approximately 50% of the height and weight of current Yamatake products). This not only saves space for installation but also contributes to a reduction in the raw materials used in the manufacturing process.

The new product is a large-diameter version of the high-pressure differential ACTIVAL two-way valve that was launched in June 2007; it thus completes the lineup of the ACTIVAL Series of HVAC valves. The ACTIVAL Series will be sold not only in Japan but also aggressively in overseas markets.

• Cavitation erosion resistant mechanism
Valves used in heat source applications can experience cavitation as a result of the high pressure difference. This phenomenon can damage both the control valve and the inside of the pipes. To help prevent this occurring, Yamatake has developed a cone-shaped diffuser, designed so that it can be integrated within a conventional ACTIVAL unit. The cone-shaped diffuser effectively modifies the flow of liquid within the valve, serving to prevent excessive pressure drops, and thus inhibiting cavitation-induced erosion.

Courtesy of Yamatake