Tiansu (Tianjin) Valve Group Co., Ltd. is one of the leading manufacturers and suppliers of electric modulated dynamic balance valve in China. If you're going to buy wholesale customized electric modulated dynamic balance valve made in China, welcome to get quotation from our factory. Quality products and reasonable price are available.
Overview of Working Principle
The dynamic balance electric valve is an integrated product combining dynamic balancing with electric and manual regulation. It adopts a completely new design concept, enabling the regulating valve to dynamically balance system pressure fluctuations during actual operation. Therefore, the flow characteristic curve of this electric dynamic balance valve during operation matches the ideal flow characteristic curve without deviation. The special design ensures the valve's regulation is only affected by the standard control signal and not by system pressure fluctuations. Moreover, for any opening position of the electric valve, its flow rate is unique and constant. For HVAC systems, this means the heat (cool) delivered by the electric valve at any regulating position is stable. Consequently, this valve is particularly suitable for variable flow systems with significant load fluctuations, featuring strong anti-interference capability, stable operation, and high regulation accuracy. It overcomes the drawback of traditional electric regulating valves whose flow rate varies with system pressure even at the same opening position. The 20 inch dynamic balance valve maintains this flow rate constant. When the command changes, the electric valve opening changes to set a new flow rate value, and the balance valve then maintains this new flow rate constant. This ensures the unit's flow rate remains unchanged regardless of external influences, leading to more stable system regulation.
Technical Parameters
- Body Material: Ductile Iron
- Connection Size: DN50-DN500
- Nominal Pressure: 1.6 MPa
- Applicable Medium: Water
- Medium Temperature: 0～80℃
As shown in the figure above, in variable flow systems with large load fluctuations, when the system pressure changes, the differential pressure (P1-P3) across the dynamic balance electric valve also changes:
(1) When the inlet pressure P1 increases, (P1-P2) increases. The valve spool moves upward, reducing the opening between P1 and P2, and the spool pressure P2 decreases. When the inlet pressure P1 decreases, (P1-P2) decreases. The valve spool moves downward, increasing the opening between P1 and P2, and the spool pressure P2 increases. Thus, regardless of system pressure changes, the differential pressure between P2 and P3 remains constant due to the regulating action of the electric valve spool. Therefore, this electric dynamic balance valve has strong anti-interference capability and dynamic balancing function.
(2) When the electric actuator receives a control signal moving the valve stem along the A-B direction, the opening between P2 and P3 also changes. Since the differential pressure (P2-P3) always remains constant regardless of the system differential pressure (P1-P3) change, the water flow rate delivered corresponds uniquely to any opening position. Furthermore, the actual flow characteristic curve of this 20 inch dynamic balance valve matches its ideal flow characteristic curve without deviation. Hence, this electric regulating valve has better regulating characteristics compared to traditional ones. Manual adjustment of the valve opening is possible during power outages.
Product Application
The dynamic balance electric valve is primarily suitable for temperature control of terminal air-conditioning equipment (such as AHUs, FAHUs, and air handlers) in HVAC systems, demonstrating more advantages in variable flow systems with significant load fluctuations.
FAQ
Q: What is the main advantage of a dynamic balance electric regulating valve compared to a traditional electric regulating valve?
A: Its key advantage is maintaining a constant flow rate at any given opening regardless of system pressure fluctuations, ensuring stable heat/cool delivery and better control in variable flow systems. This dynamic balance electric valve is immune to pressure changes.
Q: Can the EDRV valve be operated manually?
A: Yes, the electric dynamic balance valve is designed with integrated manual override functionality. In case of a power outage or during maintenance, the valve opening can be adjusted manually using the handwheel or manual operator.
Q: In which type of HVAC system is the dynamic balance electric regulating valve most beneficial?
A: It is most beneficial in variable flow systems with large load fluctuations, such as complex commercial building HVAC systems. The 20 inch dynamic balance valve helps stabilize flow to terminal units despite pressure variations in the main system.
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