TAC Venta is said to be the market's first range of HVAC valves to IEC 534. Compliance with this standard means that the valves are sufficiently accurate that heat transfer is always considered to be proportional to the valve's control signal.
Such a high degree of accuracy soon pays off in terms of reduced energy usage as in both short and long term, it is the accuracy of the valve's control characteristic that determines how effectively it can control operating costs.
Ultimately, achieving the correct level of optimisation of the equipment that, in turn, controls and monitors the indoor climate in the building, is dependent upon the performance of the valve. TAC believes that changing the existing valves in a system to TAC Venta valves can therefore be an investment that pays off in the short term.
The new valves require only limited maintenance as all valves in the range are self-cleaning, insensitive to solid particles in the water and corrosion-resistant.
The range includes both 2-way and 3-way valves. Together, they replace all valves available on the market with capacities from Kvs 0,25 up to Kvs 38 (Cv 0,29 to 44,5).
Easy to install and remove, threaded, soldered or welded connections are available, and all valves can also be controlled by one and the same actuator, the TAC Forta.
The stem, the crown plug and the valve seat are all made of stainless steel, which contributes to both the accuracy of control and to the long life of the valves.
TAC Venta makes it easy to select the right valve for any application.
This saves time in specifying, ordering and the actual installation work.
IFC 534 compliance
IEC 534 is an industrial standard that specifies that the valves should maintain high control accuracy throughout their operating range. The purpose of this valve standard is to restrict the actual performance deviation from the specified characteristic.
TAC Venta is the first range of HVAC valves that has sufficiently high control accuracy to be approved to IEC 534.
Suitable for replacing all valves in applications up to Kvs 38 (Cvs 44,5)
TAC Venta valves replace all older types of valves used in HVAC applications. The range extends from size DN 15 to DN 50 (1/2" to 2"), with Kvs 0,25-38 (Cvs 0,25 to 44,5) and a control range up to R 200.
Accurate valve performance characteristics for optimum operating costs
The valve has an EQM characteristic (ie, equal percentage, modified). This means that the valves match the characteristics of the heat exchanger or heating coil so that heat transfer is proportional to the control signal. This in turn means that the input to the climate control and supervision system is correct. The valve characteristic fulfils the requirements of IEC 534, ensuring precision throughout the control range from 0 to 100%. Much of this accuracy is due to the design of the crown plug.
Stainless steel crown plug, stem and seat for long life and high performance
The valves have a high finish and long life. The robust design withstands severe stresses. The valves are also insensitive to cavitation, largely due to the design of the crown plug for which patents have been applied.
All valves are self-cleaning and have a highly polished stem for minimum wear of the stuffing box. This simplifies maintenance, reduces service requirements and, if necessary, permits rapid replacement of the stuffing box. TAC Venta valves are silicon-free.
Valves made of bronze for use with media temperatures from -20 to +150°C
The valve body is made of precision-cast bronze with a stainless steel valve seat. Operation is quiet (Xfz = 0,6) with excellent shut-off (<0,02%).
The long stroke (20 mm (3/4")) of TAC Venta valves contributes to their high-precision control characteristics. Valves are available from size DN 15 to DN 50 (1/2" to 2", with Kvs (Cvs) values of 0,25-38 (0,29-44,5) and pressure class PN16 (rating 230 PSI).
Actuators for optimally adjusted control circuits
The TAC Forta is an electromechanical valve actuator with an integral microprocessor and stepping motor to provide fast, exact valve positioning.
Used in combination with TAC Venta valves, the high accuracy of the actuator and valve makes it possible to optimise the control and supervisory system for indoor comfort in the building, reduce operating costs and minimise maintenance. As a result, investments in both new and existing installations pay off rapidly.
The fast response time (15 s) and accurate valve positioning performance of the actuators mean that they can provide accurate control. The integral microprocessor enables the actuator to be matched to the particular application: running time is therefore always the same, regardless of the stroke of the valve.
For more information contact Dennis Esmonde-White, TAC Africa, 031 767 0201, [email protected]
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