Ultra High Resolution Proportional Pressure Regulator Ultra High Resolution Proportional Pressure Regulator


Ultra High Resolution Proportional Pressure Regulator

QKL-B1TR/QKL-B4HR is ultra high resolution electro-pneumatic proportional pressure control valves provides a step control of ±0.005% F.S., ideal for very sensitive applications. This series is a complete closed loop servo system consisting of two solenoid valves, an internal pressure transducer, and electronic controls.

A bleed orifice of 0.1mm (M5 exhaust) comes with this series. Based on input signal, the pressure is controlled by two solenoid valves and the bleed to maintain precise pressure; one valve functions as inlet control, the other as exhaust, and a constant bleed. This series features fast and high resolution pressure change. The pressure output is measured by an internal feedback pressure transducer that provides a feedback signal to the electronic controls. There are 3 selections of input signal and monitor signal: 0-10VDC, 4-20mA or RS485 ModBus.

All our products have CE, SGS, RoHS certification with ISO13485 quality system.


  • Compact
  • High Precision
  • High Sensitivity
  • Wide Pressure Range


  • Leak Testing At Low Pressure
  • Microfluidics Flow Control
  • Dispensing
  • Multi-Stage Pressure Control
Output Range 2 / 5 / 10 bar ( 29 / 72 / 145 psig)
Supply Pressure Max 11.5 bar (165 psi)
Input Signal 0-10V / 4-20mA / RS485
Monitor Output 0-10V / 4-20mA / RS485
Supply DC24V (≦3W) DC24V (≦5W)
Medium Clean compressed air or with 5 µm filter
Repeatability ±0.02% F.S. ±0.05% F.S.
Resolution (max) ±0.005% F.S. ±0.01% F.S.
Accuracy ±0.1% F.S. ±0.1% F.S.
Hysteresis ±0.01% F.S. ±0.1% F.S.
Flow Rate 2.5L/min @ 1bar (orifice: 0.45mm) 3L/min @ 1bar (orifice: 0.5mm)
120L/min@1bar(orifice: 3.0mm)
Temp. Range (Operating) 0 ~ 70 ⁰C ( 32 ~ 158 ⁰F)
Port Size 1/8" PT
Manifold Material Aluminum
Wetted Materials Aluminum, Stainless steel, Brass, FKM
Electrical Connection M12 Connector (2m)
Ingress Protection IP 65

* For Command Signal type 0-10V, the minimum driving current is 3mA.