• proportional pressure regulator
High Pressure Proportional Regulator (0-18bar.0-70bar)
Product Serial: QKL-B4H

This series is a complete closed loop servo system consisting of two solenoid valves, an internal pressure
transducer, and electronic controls. Based on analog signal, the pressure is controlled by two solenoid
valves to maintain precise pressure; one valve functions as inlet control, the other as exhaust. The pressureoutput is measured by an internal or an external feedback pressure transducer that provides a feedbacksignal to the electronic controls. The regulator is suitable for industries that require precise pressure changes at any time and monitor pressure values.
Available with 3 selections of input signal: 0-10VDC, 4-20mA, or RS485 Modbus. Monitor signal can be
chosen from 0-10V, or 4-20mA. Our special design offers high pressure and high flow capability electronic pressure regulator in uni-body design.
All our products have CE, SGS, RoHS certification with ISO13485 quality system.

◆ Small Size
◆ High Precision
◆ High Sensitivity
◆ Wide Pressure Range

Industrial application
◆ Laser Cutter
◆ Leak Tester
◆ Tension Control
◆ PET bottle molding machine
◆ Multi-Stage Pressure Control
Type B4H-P18(261psi) B4H-P60(870psi) B4H-P70(1015psi)
Input Signal 0-10V / 4-20mA /RS485
Output Range 0-18bar (260 psi) 0-60bar (870 psi) 0-70bar(1015 psi)
Supply Pressure Max 20bar (290 psi) 65bar (942 psi) 74bar(1073 psi)
Monitor Output 0-10V / 4-20mA
Supply DC24V (≦4W)
Response 4S
Medium Clean compressed air or with 5 μm filter
Repeatability ±0.1% F.S. ±0.3% F.S. ±0.3% F.S.
Hysteresis ±0.3% F.S. ±0.3% F.S. ±0.3% F.S.
Linearity ±0.1% F.S. ±0.1% F.S. ±0.1% F.S.
Accuracy ±0.2% F.S. ±0.3% F.S. ±0.3% F.S.
Sensitive 0.1bar 0.5bar 0.5bar
Flow Rate 800L/min @ 60bar 150L/min @ 60bar 180L/min @ 70bar
Temp. Range(Operating) -196 ~ 70 ⁰C ( -320 ~ -158 ⁰F)
Port Size 1/8"PT
Manifold Material Aluminum
Electrical Connection M12 Connector(2m)
Ingress Protection IP 65
Weight 800 g
Series Type   Input Signal   Monitor Output   Mounting Bracket   Dislay Unit   Display Unit
QKL- B4H - E - C - M - P70 - U
  B4H: Low flow with internal feedback   *E: 0-10V   C:0-10V   M:M type   P18:0 - 18 bar, 80LPM   S:psi
  A: 4-20mA A:4-20mA L:L type P60:0 - 60 bar, 160LPM U:bar
  R: RS485 Modbus     P70:0 - 70 bar, 200LPM  

*For Command Signal type 0-10V, the minimum driving current is 50mA.
★Please consult us for customized pressure range.

The wiring diagram shows from top view.

No. Color Function
1 Blue 24V DC Power (-)
Output monitor (-)
2nd loop transducer 0 -10 V (-)
2 Brown 24V DC Power (+)
2nd loop transducer 4 - 20 mA (+)
3 Black Monitor output (+)
4 White 0-10 V Command (+)
4-20 mA Command (+)
5 Gray RS485(D-)
6 Green 2nd loop transducer 0 -10 V (+)
2nd loop transducer 4 - 20 mA (-)
7 purple - Command (-)
8 Red RS485(D+)

** Warning: Do not rotate the connection socket when connected, to avoid damage to the internal sensor.