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What are the commonly used valves in HVAC water systems? Illustrate various application methods of regulating valves with pictures and text

2021-10-23 02:11:52
a

Design and layout principles of manual balancing valves
It should be installed in a graded manner, that is, on the main, riser, and branch pipelines; Each parallel branch pipeline should be installed simultaneously. Branch balance valve, riser balance valve, main balance valve

Pneumatic butterfly valve

Automatic balancing valve
Generally used in situations with fixed flow. When designing layout, the following principles should be noted: it should be installed on end devices such as fan coils and air handling units;
For systems with automatic balancing valves installed at the end, there is no need to install automatic balancing valves in branches and risers; An automatic balance valve should be installed at the outlet of the refrigerator or boiler to avoid overcurrent of these devices.
Self operated differential pressure controller
It is a proportional pressure difference controller with a certain proportional pressure difference range to adapt to the needs of variable flow rates; When combined with a manual balance valve, it can stabilize the pressure difference while accurately setting the flow rate. Online teaching of HVAC design for Tree Bird Education, Teacher Du.
Self operated differential pressure controllers are usually used in conjunction with manual balancing valves, known as flow/differential pressure balancing valve groups or flow/differential pressure regulator combinations, also known as dynamic balancing valve groups or automatic differential pressure balancing valve groups, and are classified as automatic balancing valves and are a very accurate balancing device; When each control valve is matched with this type of valve, its valve weight is close to 1.

Pneumatic butterfly valvePressure difference between stable risers
Pneumatic butterfly valvePressure difference between stable branches
Differential pressure on stability control valve

Comparison of Three Application Methods
In the above three applications, from the perspective of balance effect, c>b>a, especially c. If each control valve in the system is connected to a self operated differential pressure controller, from a control perspective, this is a good solution because the valve weight of the control valve is close to 1; From the perspective of performance price ratio, the application of method b is the most common.
Electric balanced two-way valve
This is a valve suitable for end-of-life equipment such as fan coil units and water loop heat pump units. It is a valve that integrates a manual balance valve or an automatic balance valve with an electric two-way valve. Its function is the same as when the two valves are separated, and the flow rate needs to be set in advance. This combination method can effectively save installation space and cost.

Arrangement of electric balanced two-way valves

Dynamic balance electric regulating valve
Dynamic balance electric control valve is a valve that integrates automatic balance valve and electric control valve. After simply setting a high flow value, its flow can be adjusted between zero and high according to actual needs;Moreover, within the working pressure difference range, the pressure difference changes in the pipeline system have no impact on the set value (only affected by the control temperature), and the valve weight of the control valve part is good, making it a highly automated balancing device.
Dynamic balance electric control valves are generally used in variable flow systems and are commonly used in large end equipment such as fresh air units and air handling units.

Adjusting characteristics of dynamic balance electric control valve
动态平衡电动平衡调节阀排布

Dynamic balance electric balance regulating valve layout



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