The ZL self-operated flow control valve is an energy-saving device that utilizes the energy of the regulated medium itself to maintain a constant flow rate without the need for external power. The valve primarily consists of a regulating body, an actuator, and an orifice plate with preset resistance. Its operating principle involves a built-in pressure compensation mechanism that senses the differential pressure across the orifice in real-time. By automatically adjusting the plug opening to maintain a dynamic balance between the medium pressure and spring force, it ensures the output flow remains at the set value despite fluctuations in network pressure. The ZL series is widely used in district heating, central air conditioning chilled/hot water systems, and industrial circulating water systems as key equipment for resolving hydraulic imbalance and improving energy efficiency.

Product Image of ZL Self-operated Flow Control Valve

Feature

1.No external power required:Directly utilizes the pressure energy of the medium for automatic regulation. Consuming no electricity or air supply significantly reduces supporting system costs and operating expenses, providing excellent energy-saving attributes.
2.Excellent pressure-independent characteristics:Equipped with high-sensitivity pressure-sensing diaphragms to effectively offset interference from network pressure fluctuations. Within the rated differential pressure range, the output flow remains stable regardless of upstream or downstream pressure changes.
3.High-precision constant flow control:Utilizes hydrodynamically optimized plug and cage structures for superior linearity and minimal dead zones. Flow error is typically maintained within ±5%, ensuring precise heat or cooling distribution across branches.
4.Simple and intuitive adjustment:Equipped with a clear flow setting dial or adjustment nut. Users can complete flow presetting on-site with simple rotation according to design requirements, eliminating the need for tedious manual pre-commissioning.
5.Durable and reliable material system:Bodies are available in cast steel or stainless steel. Key internals such as diaphragms, springs, and sealing pairs are made of corrosion-resistant and fatigue-resistant materials to ensure long-term sensitivity.
6.Significant noise reduction:Optimized flow path design and multi-hole throttling technology effectively reduce noise and vibration during high-velocity flow, extending the service life of the piping system and related instruments.
7.Intrinsic safety and low failure rate:The absence of complex electronic components or fragile moving parts results in a very low failure rate. The purely mechanical regulation ensures high reliability under harsh conditions.
8.Compact installation layout:The scientific connection between actuator and body ensures a small overall footprint. It can be flexibly arranged in heat exchange stations, building entrances, and terminal branches, greatly simplifying hydraulic balance design.