Page 47 - Bürkert

2/2-way Proportional Valve

2871 G 1/8”, DN0.3-2.0 mm

• Excellent range
• Very good repeatability
• Compact Design

2 (A)

1 (P)

The direct-acting solenoid control valve, Type 2871 (20 mm installa- Dimensions [mm] (see datasheet for further Details)
tion width), is used as the regulating unit in control loops. Due to an
elastomeric seat seal the valve closes tight, up to the DN specific nominal
pressure.
The operation lever of the valve is suspended frictionless, which leads
to an extraordinary adjustment characteristic. Valve control takes place
through a PWM signal (see control electronics, Type 8605).

Technical data C

Body material Brass, stainless steel
Medium Neutral gases, liquids on request
Span 1 : 200
Responsivity 0.25% of full scale
Response sensitivity 0.25% of full scale A
B
PWM frequency 1500 Hz
Max. coil current 220 mA
(Maximum value, value depends on the operating Size A B C
pressure)
Medium temperature -10 °C to 90 °C G 1/8” 25 20 49.5
Duty cycle 100% continuously rated
Ambient temperature Max. 55 °C
Seal material FKM
Operating voltages 24V DC
Power consumption 2 W (to DN0.6), 5 W (from DN0.8) Options/Accessories
Electrical connection Cable Plug Type 2507 acc. to Form B Industrial
standard (not included) • Seal material EPDM
Typical control data at • 12V coil
1)
PWM control
Hysteresis • Coil with 30 cm flying leads
Repeatability < 5% • Oxygen versions
Sensitivity < 0.25% F.S. 2) • Parts oil-, fat- and silicon free
Span < 0.25% F.S. – <0.1% F.S. with DN <0.8 mm 2)
Response time (10-90%) 1:200 (DN0.8-2), 1:500 (DN0.05-0.6) • Flange
<15 ms
Protection class IP65 (with cable plug)
1) Characteristic data of control behaviour depends on process conditions
2) by flow measurement

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