A self-supporting balancing valve automatically adjusts the flow rate in branch pipes based on changes in the pressure of the medium itself. It features opening indication, locking, and closing functions. A one-time adjustment before operation automatically eliminates hydraulic imbalances and resolves issues related to uneven heating/cooling and large flow rates with small temperature differences. Equipped with a flow display and PTFE seals, the flange connection dimensions conform to GB4216 standards. It is characterized by easy operation, reliable performance, and long service life. When used in water systems, it requires a minimum operating pressure differential of 20 kPa, and its automatic adjustment mechanism can maintain system flow balance over a long period.
I. Structural Composition
Dual Valve Design
Manual Adjustment Valve: Presets the flow rate value; the opening is adjusted via an external handwheel to lock the initial flow rate.
Automatic Adjustment Valve: Senses changes in system differential pressure and automatically adjusts the opening via a spring and diaphragm to maintain a constant flow rate.
Key Components
Pressure-Sensing Diaphragm: Converts the inlet and outlet pressure difference (ΔP) into mechanical force, driving the valve movement.
Balancing Spring: Provides a counterforce, working in conjunction with the medium pressure to control the valve position.
II. Working Principle
Constant Flow Mechanism
Flow Rate Formula: G = Kv·√(P2-P3), where Kv is the preset flow coefficient of the manual valve.
When the system flow rate increases: the automatic valve closes less, increasing resistance to maintain the set flow rate; conversely, it opens more.
Adaptive Differential Pressure Range
Effective operating differential pressure: 20–300 kPa. Exceeding this range may lead to control failure or noise.
III. Core Application Scenarios
Heating/Air Conditioning Water Systems
Solve the problem of uneven heating and cooling caused by insufficient pressure differential at the far end of the pipe network, and achieve flow distribution in each branch according to the design ratio.
Case Study: In a centralized heating system, the temperature difference at the user end decreased from ±5℃ to ±1℃ after installation.
Energy Saving Control
Prevent excessive pump operation, reduce system resistance, and reduce energy consumption by 15–30%.
ZL47F Self-Regulating Flow Balancing Valve: Utilizes the pressure changes of the medium itself for self-regulation.
Self-supporting Balancing Valve factory
