Counterbalance valve, a kind of valve that plays a key role in hydraulic conditions, can dynamically and statically adjust the balance of the system. It is divided into three main types:
Static balancing valves, dynamic balancing valves and differential pressure independent balancing valves. Static balancing valve: precise regulation of system flow Static balancing valve, also known as manual balancing valve, digital locking balancing valve or two-position adjustment valve, its working principle is to adjust the spool and seat gap (i.e., opening), to change the valve’s flow capacity (Kv value), so as to regulate the resistance to flow through the valve, to achieve precise control of the flow rate of the purpose. Its main role is to balance the resistance in the system, to eliminate resistance imbalance phenomenon, to ensure that the new water can be balanced in accordance with the design ratio of distribution to the branches, and the branches can be in proportion to the simultaneous increase or decrease in water. Static balancing valves are widely used in mains, risers, horizontal branches and the end of the system, and their effect is comparable to that of the same pipe.
Guidelines for the correct installation and use of balancing valves
- Selection of installation position:
- The balancing valve can be flexibly installed in the water supply pipeline or return pipeline (only one installation is required for each loop). On the sub-loop side of the heat station, it is recommended to be installed on the return water line where the water temperature is lower in order to facilitate the balancing debugging.
- Balancing valve on the mains should be installed after the water supply mains pump to prevent low pressure before the pump leading to cavitation.
- Straight pipe section installation priority:
- In order to ensure the stability of the water flow through the valve before and after the flow, to improve the accuracy of measurement, balancing valves should be installed in the straight section of the pipe as far as possible.
- Balancing considerations for new and old systems:
- When the new system (balancing valve has been installed) access to the original heating (cooling) pipe network, special attention should be paid to the balance of water distribution between the old and new systems, to avoid the new system due to high water resistance and insufficient flow. 4.
- Avoid adjusting the opening degree of the balancing valve arbitrarily:
- After the installation of the pipe network system is completed, a special intelligent instrument should be used to debug and adjust all the balancing valves and lock the valve opening. In the normal operation of the pipeline network, the opening of the balancing valve should not be arbitrarily adjusted, especially the locking device. 5. There is no need to install additional shut-off valves:
- When overhauling a loop, the balancing valve on the loop can be closed directly, acting as a shut-off valve. Therefore, there is no need to install an additional shut-off valve after installing a counterbalance valve. 6.
- Recommissioning in case of changes in system loops:
- In the pipeline network system to add or cancel the loop, in addition to increasing or closing the corresponding balancing valve, in principle, all the new balancing valve and the original system loop in the balancing valve need to be recommissioned and adjusted (the original loop in the pipeline balancing valve does not need to be re-adjusted).
In summary, the balance valve with its accurate flow control ability and a wide range of application scenarios, play an important role in the balance of hydraulic conditions regulation. Correct installation and use of counterbalance valves will help improve system efficiency and ensure the balance and stability of hydraulic conditions.
