Uncover the Balance Valves: How to Accurately Regulate Fluid Pressure?

Balance valve is a kind of valve with the special function, which plays a dynamic and static balance adjustment role in the hydraulic working conditions. This article will do a detailed introduction to the balance valves.

Definition

In some industries, the balance valve is used to regulate pressure and flow in pipelines or containers. This is due to the fact that different parts of the system may experience significant pressure or flow differences. The valve is installed to ensure a consistent pressure or flow rate across the entire system.

Classification

Balance valves can be classified into two main categories: static balance valves and dynamic balance valves.

1. Static Balance Valves：

The static balance valve works to change the resistance of fluid flowing through valves by regulating opening that is related to the gap between the valve disc and seat. In this way, flow is regulated. That is, the balance valve serves as a throttle control with adjustable local resistance. For non-compressible fluid, the flow formula is shown as follows:

Q=KV×√(ΔP)

In the formula, Q stands for flow passing through the balance valve (m³/h); Kv stands for valve resistance coefficient, adjustable; ΔP stands for differential pressure (bar) between both ends of valve.

Balance valve resistance coefficient (Kv) means the flow (m³/h) through balance valve when the differential pressure between both ends of valve is 1 bar (1.02 kgf/cm²). When the opening of the balance valve remains unchanged, Kv will remain the same. That is, Kv depends on the opening of the valve. If Kv values are known under different opening conditions beforehand, flow will be figured out by measuring pressure differential between both ends of the valve. Therefore, the balance valve can be used as the throttle control to regulate flow quantitatively.

Taloar small-sized brass balance valve adopts low-resistance Y-shaped structure, and its orifice plug is of V-shaped design for better linear regulation. Flow measuring fittings on both ends feature good self-sealing performance and easy adjustment. The highly precise valve disc and favorable sealing performance ensure measurement precision and persistence.

Taloar ductile iron flow balance valve adopts low-resistance Y-shaped structure, the shell is coated with epoxy resin. Flow measuring fittings on both ends feature good self-sealing performance and easy adjustment. The highly precise valve core and favorable sealing performance ensure measurement precision and persistence.

2. Dynamic Balance Valves：They can be divided into auto-flow balance valves, dynamic differential pressure control valves and pressure independent control valves.

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Auto-flow Balance Valves: When system pressure fluctuates within working differential pressure range or when end devices are added or changed, leaving the flow in pipeline remains constant. In case of differential pressure increase, the auto-flow balance valve keeps flow unchanged by narrowing the orifice hole in the cartridge. In case of differential pressure decrease, the orifice hole in the cartridge opens up, leaves the flow remains constant.

Taloar small-sized brass balance valves can automatically maintain the flow of the water systems constant under normal working differential pressure range, which does not require field or site commissioning. The shell is of low-resistance Y structure. The detachable bottom bonnet makes it easy to inspect, repair, replace the cartridge and sewage draining. Measuring ports on both ends enjoy good self-sealing performance. High-precision valve disc ensures correct and persistence of constant flow.

Taloar ductile iron wafer-type auto-flow balance valves can automatically maintain the flow of water systems constant within normal working differential pressure range, which does not require field or site commissioning. The shell is coated with epoxy resin. Measuring ports on both ends enjoy good self-sealing performance. High-precision valve core ensures correct and persistence of constant flow.

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Dynamic Differential Pressure Control Valves: Adjust the opening of the valve with differential pressure by using the pressure drop change of the spool to compensate for the change in pipeline resistance. This allows the differential pressure to remain basically unchanged when the working conditions change. The principle is effective in a certain flow range, allowing for the control of the differential pressure in the controlled system to remain constant.

Taloar PC320 bronze differential pressure control valve, designed with a low-resistance Y-shaped structure, provides more accurate and stable control in the variable flow system, automatically and keeps the differential pressure between both ends of the control valve at a relatively stable value, with no external power source needed. The high-precision disc and reliable sealing performance ensures precision and durability in flow measurement. PC320 is mainly used in the HVAC system.

PC1000 ductile Iron differential pressure control valve, designed with a low-resistance Y-shaped structure, provides more accurate and stable control in the variable flow system, automatically and keeps the differential pressure between both ends of the control valve at a relatively stable value, with no external power source needed. The high-precision disc and reliable sealing performance ensures precision and durability in flow measurement. PC1000 is mainly used in the HVAC system.

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Pressure Independent Control Valves: Allow presetting at the maximum flow, pressure-independent balancing and electric control. Flow control is only related to the opening of the electric actuator, regardless of system pressure differential fluctuation. The authority reaches 100%. The actual and ideal flow characteristic curves keep consistent provides precise and fast control, reduces actuator operating frequency, bringing stable energy saving effect.

Function and application:

Balance valves serve three key functions: load holding, load control and safety. They are used in a diverse range of applications.

Load Holding: The actuator is capable of lifting and lowering heavy loads at a specified speed while maintaining a fixed position (braking in place).

Load control: It is important to limit the speed of the actuator in order to prevent it from stalling and losing pressure. This is particularly relevant in situations where the load is heavy and moving at high speeds. Additionally, maintaining stability in the speed of the circuit is essential.

In the event of an oil circuit malfunction or leakage, the balance valve integrated into the actuator can effectively prevent the uncontrolled movement of the load.

The balance valve is typically employed in large-scale heating and air conditioning water systems. It effectively ensures the static hydraulic and thermal balance of the pipe network, eliminating the imbalance between the hot and cold levels. It can adapt to system quality or quantity adjustments and achieve energy savings. Additionally, it is a popular choice in the water treatment and industrial refrigeration sectors.

Installation

When installing the balance valves, please note the following points:

Balance valves can be installed on both the supply pipe and the return pipe. However, the return pipe is the preferred location, particularly for high-temperature loops. This is because it facilitates debugging.

The installation of a balance valve for the supply (return) water pipe eliminates the need for a shut-off valve.

Once the balance valves have been installed in the piping system, it is necessary to make adjustments in order to ensure that the system piping characteristics, including resistance and the number of ratios, are consistent with the design requirements.

Precautions

It is not possible to use a balance valve in a system with centralized regulation to change the volume of water in response to demand. This is because such a system will undergo changes in hydraulic condition, which will affect the performance of the balance valve.

In selecting a balance valve, it is important to consider not only the pipe diameter, but also the actual demand and system conditions. The balance valve should be selected with the same nominal pipe diameter specifications.

It is possible to adjust the parameters of the balance valve at any stage during the process. However, it is important to avoid making arbitrary changes to the balance valve opening, in order to maintain the stability and efficiency of the system.

The balance valve is a vital piece of fluid control equipment, playing an indispensable role in numerous industrial sectors. By precisely regulating the flow and pressure, the balance valve ensures the stable operation of the system, improves the efficiency of energy use, and also guarantees the safety and reliability of the equipment.

As science and technology advance and industrial development continues, the design, manufacture and application of balance valves are also evolving. Taloar is responding to market changes by transforming traditional balance valves into intelligent balance valves. This innovation is enhancing the performance, convenience and scope of application of balance valves. Taloar will continuously launch launching new products.

If you need to keep up with innovations and technological advancements in balance valves, Taloar will support you! For more details, please contact sales@taloar.com or WhatsApp 008618112507128.