• Low Pressure Proportional Regulator(0-8bar)
Low Pressure Proportional Regulator(0-8bar)
Product Serial: QKL-B1T.B2T/QKL-B3-1.B3-2/QKL-B3-1A

This series is a complete closed loop servo system consisting of two solenoid valves, an internal pressuretransducer, and electronic controls. Based on analog signal, the pressure is controlled by two solenoidvalves 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 pressurechanges 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 1-5V, 0-10V, or 4-20mA. Internal pressuretransducer comes with B1T, B3-1, and B3-1A series, whereas B2T and B3-2 uses an external pressuretransducer for feedback (ideal for when the vessel is distant away from the regulator).
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  B1T、B2T B3-1、B3-2 B3-A
Input Signal 0-10V / 4-20mA/ RS485 0-10V / 4-20mA
Output Range 0-2bar
(29 psi)
(58 psi)
(58 psi)
0-8bar (116 psi)
Suggesting Supply Pressure Max 3bar
(43 psi)
(73 psi)
(131 psi)
(73 psi)
(131 psi)
9bar (131 psi)
Max working pressure 9 bar(131 psi)
Monitor Output 1-5V / 0-10V / 4-20mA 0-10V / 4-20mA
Power Supply DC24V (≦4W)
Response 0.8S
Medium Clean compressed air or with 5 μm filter
Repeatability ±0.1% F.S. ±0.5% F.S.
Hysteresis ±0.1% F.S. ±0.2% F.S. ±0.2% F.S. ±0.3% F.S. ±0.5% F.S.
Linearity ±0.1% F.S. ±1% F.S.
Accuracy ±0.3% F.S. ±0.5% F.S.
Flow Rate 8L/min
320L/[email protected] 640L/[email protected]
Temp. Range(Operating) 0-70⁰C ( 32-158 ⁰F)
Port Size G1/8" G1/4"
Manifold Material Aluminum
Electrical Connection M12 Connector(2m)
Ingress Protection IP 65
Life Cycle Over 1 Billion Times
Weight 420 g 550 g 430 g
Series Type   Input Signal   Monitor Output   Mounting Bracket   Pressure and Flow   Display Unit
QKL- B1T - E - C - M - P8 - U
  B1T: Low flow with internal feedback   **E: 0-10V   C:0-10V   M:M type   For B1T, B2T
P2:0 - 2 bar, 8LPM
P4:0 - 4 bar, 10LPM
P8:0 - 8 bar, 20LPM
B2T: Low flow with external feedback A: 4-20mA A:4-20mA L:L type U:bar
B3-1: High flow with internal feedback R: RS485 Modbus D:1-5V   For B3-1, B3-2
P4:0 - 4 bar, 320 LPM
P8: 0 - 8 bar, 640 LPM
B3-2: High flow with external feedback        
*B3-A: High flow with internal feedback       For B3A
P8:0 - 8 bar, 640 LPM

*B3-A is an economic type, only with 8 bar. B3-A does not have RS485 modbus interface and does not have 1-5V monitor output.
** 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 (-)
Command (-)
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 0-5 V Command (+)
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 - -
8 Red RS485(D+)

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

Product Precautions

The valve can be mounted in any position. For very low pressure control, works best when mounted upright.
And Ensure a minimum closed end volume of 40c.c. to allow proper functioning.

※Preparation Before Piping
Before piping is connected, it should be thoroughly blown out with air (flushing) or washed to remove chips, cutting oil and other debris from inside the pipe.
Wrapping of Sealant Tape
When screwing together pipes and fittings, etc., be certain that chips from the pipe threads and sealing material do not get inside the piping. When sealant tape is used, leave 1.5 to 2 thread ridges exposed at the end of the threads.

Operating Environment
  1. Do not operate in locations having an atmosphere of corrosive gases, chemicals, sea water, or where there will be contact with the same.
  2. In locations where the body is exposed to water, steam, dust, etc., there is a possibility that moisture or dust could enter the body through the EXH port, solenoid valve EXH port and/or built-in regulator EXH port, thereby causing problems.
  3. In locations which receive direct sunlight, provide a protective cover etc.
  4. In locations near heat sources, block off any radiated heat.
  5. Employ suitable protective measures in locations where there is contact with water droplets, oil or welding spatter, etc.

Air Supply
  1. Compressed air, nitrogen, oxygen or argon can be used as a fluid.
  2. Do not use compressed air which includes chemicals, synthetic oils containing organic solvents, salt, or corrosive gases, etc., as this can cause damage or malfunction.
  3. If oxygen is used as the fluid, it can lead to serious and unforeseen risks. However, it is possible to manage and control the risk of hazards and economic loss. In order to use the product safely, it should only be handled by personnel with appropriate knowledge, with support from a suitably qualified specialist.
  4. Oxygen gas increases the susceptibility of substances to burning; Oxygen gas can be ignited by frictional heat and static electricity. If oxygen is ignited, the metal and seal materials burn. Therefore, flush the piping thoroughly and mount a suitable filter to prevent foreign matter such as metal powder and dust from entering the product.
  5. Take safety measures by installing safety devices (e.g. a circuit that stops the supply of oxygen gas) to prevent fire and explosion in the event of failure, taking flameproof safety standards into consideration.
  6. Since there are some exhaust ports on the product, connect the piping in order to exhaust oxygen. Do not block the exhaust port.

KaoLu Ent. Co. Ltd. products are warranted to the original purchaser only against defects in material or workmanship for 6 months from the date of manufacture. The extent of KaoLu’s liability under this warranty is limited to repair or replacement of the defective unit at KaoLu’s option. KaoLu shall have no liability under this warranty where improper installation or filtration occurred.