When it comes to maintaining precise temperature control in liquid systems, flow control valves play a crucial role. These valves provide a means to regulate the temperature of coolant at specific points within a system, ensuring it remains at a defined value. PDT, a trusted provider of thermal control valves, offers passive, thermostatic-type valves that do not require electrical power or a control circuit to operate. In this article, we will explore the reasons why flow control valves are essential and the advantages they bring to liquid systems.
1. Precise Temperature Control: One of the primary reasons to use flow control valves is to achieve precise temperature control in liquid systems. PDT's thermal control valves utilize high-output linear actuators to move a sliding spool or poppet element. This movement selectively opens or closes fluid passages within the valve, allowing for precise control of coolant temperature. By maintaining a consistent temperature, these valves contribute to the optimal performance and efficiency of liquid systems.
2. Flexibility in System Design: Flow control valves from PDT offer flexibility in system design, as they can be used in both diverting and mixing applications. This versatility allows system designers to tailor the valve's configuration to meet specific requirements. Whether you need to redirect the flow of coolant or blend different temperatures, thermal control valves can be integrated accordingly. PDT can also incorporate additional features such as temperature sensors, supplemental fluid ports, and relief valves, streamlining system plumbing and reducing costs.
3. Actuator Options for Various Applications: PDT offers two different actuator types for thermal control valves, allowing for customization based on usage and system considerations. The sealed paraffin actuator is a popular choice for airborne and ground vehicle applications. It comes with elastomeric seals selected for compatibility with most coolants or oils. For critical applications like long-duration spacecraft, PDT provides thermal control valves with an all-welded design, eliminating the need for elastomeric seals. These valves utilize a flexible metal bellows filled with a high-expansion liquid as the actuator, ensuring reliability and longevity.
4. Compatibility with a Range of Coolants: PDT's thermal control valves are designed to be compatible with various coolants or oils. The valves' performance is specified by the nominal control temperature and the control band. Standard paraffin actuators cover nominal control temperatures ranging from 35°F to 210°F (2°C to 98°C) with a control band of ±8°F (±5°C). Additionally, PDT has produced thermal control valves with nominal control temperatures from 32°F to 77°F (0°C to 25°C) and a control band of ±18°F (±10°C). This broad range ensures suitability for diverse liquid system applications.
Conclusion: Flow control valves, such as PDT's thermal control valves, offer numerous advantages in liquid systems. They enable precise temperature control, ensuring optimal performance and efficiency. The flexibility of these valves allows for tailored system design, accommodating both diverting and mixing applications. With different actuator options and compatibility with various coolants, PDT's thermal control valves cater to a wide range of requirements. Whether for airborne, ground vehicle, or critical space applications, utilizing flow control valves enhances temperature regulation and contributes to the overall reliability and performance of liquid systems. Contact PDT's application engineers to explore how their thermal control valves can benefit your specific liquid system needs.