The KaoLu QKL-B1HF is an ultra-high resolution electronic proportional pressure regulator that converts an electrical command signal into a precisely controlled pneumatic output pressure. Its closed-loop architecture uses a single solenoid valve, an integral pressure sensor, and a microcontroller to maintain the setpoint with ±0.1% F.S. accuracy and ±0.03% F.S. resolution — suitable for applications requiring fine pressure control such as medical device testing, leak detection, and laboratory automation.

How does the single-valve closed-loop design achieve high resolution?

Unlike conventional dual-valve regulators that use separate fill and vent solenoids, the QKL-B1HF employs a single proportional valve with an integrated pressure sensor and PID control circuit. The sensor continuously measures output pressure and the microprocessor adjusts the valve orifice in real time to compensate for supply pressure fluctuations, downstream leaks, and temperature drift. This architecture eliminates the crossover deadband inherent in dual-valve designs while achieving a hysteresis of ±0.1% F.S. and repeatability of ±0.05% F.S.

What versions are available for different flow requirements?

The regulator is offered in two configurations: with built-in bleed for dead-ended (non-consuming) applications, and without built-in bleed for flow-through applications. The no-bleed version uses interchangeable ruby orifices ranging from 0.2 to 1.0 mm to set the flow characteristic — from 820 mL/min (0.2 mm at 2 bar) to 77,270 mL/min (1.0 mm at 10 bar). The orifice size determines both the flow range and the minimum controllable flow, allowing the regulator to be matched to the application's specific dynamic range.

How is the QKL-B1HF integrated into automated systems?

Three command interfaces are supported: 0-10 VDC analog voltage, 4-20 mA current loop, and RS485 Modbus RTU for digital control. The M12 8-pin connector carries power (24 VDC), command input, and monitor output on dedicated pins. An output monitor signal (0-10 V or 4-20 mA) provides real-time pressure feedback to the host controller. CE, SGS, RoHS, and ISO 13485 certifications qualify the regulator for medical device and laboratory instrumentation use.