Burkert 20023660 Type 2861 is an extremely compact direct-acting 2-way solenoid proportional control valve. It features an orifice of 0.80 mm and is based on the standard variant of Type 2871. It is used as an actuator in closed control loops (pressure, flow, temperature, etc.). Compared with the standard variant, the valve is essentially of simpler construction and assembly and testing procedures are optimized, easing high volume series production with shorter delivery times.

General Technical Data

Product properties
Seal material	FKM
Body material	Stainless steel
Circuit function	A (2/2-way solenoid proportional control valve, Direct-acting, Normally closed)
Hysteresis	< 5%
Repeat accuracy	< 1% FS
Response sensitivity	< 1% FS
Setting range	1:25
Actuating time (10...90%)	< 15 ms
Pressure range	-1...12 bar
Operating voltage	24 V DC
Power consumption	Max. 5 W
PWM frequency	800 Hz
Operating medium	Neutral gases, liquids on request
Medium temperature	-10 °C...+90 °C (with FKM)
Degree of protection	IP65

Approvals and Conformities

• FDA: All wetted materials are compliant with the Code of Federal Regulations published by the FDA (Food and Drug Administration, USA) according to the manufacturer’s declaration.
• EC Regulation 1935/2004: All wetted materials are compliant with EC Regulation 1935/2004/EC according to the manufacturer’s declaration.
• Oxygen: Optional suitability for use with gaseous oxygen. The products are suitable for use with gaseous oxygen, according to the manufacturer's declaration.

Dimensions

Note

Dimensions are in mm.

Sub-base body

Threaded body G 1/8, NPT 1/8

Performance Specifications

Characteristic Curve Note

The dimensioning of the nominal diameter is very important for proportional valves to function properly within the application. The nominal diameter must be selected so that, on the one hand, the desired flow range is achieved and, on the other hand, when the valve is fully open, a sufficient portion of the total pressure drop occurs across the valve.

Reference value: Δp valve > 25% of the total pressure drop.

Otherwise, an ideal, linear valve characteristic is deformed into a curved system characteristic. If the differential pressure (difference between inlet and outlet pressure) exceeds half the value of the nominal pressure discontinuities may occur.

Product Operation

Valve control takes place through a PWM signal (pulse-width modulation). The duty cycle of the PWM signal determines the coil current and hence the position of the plunger.

The Bürkert control electronics Type 8605 converts an analogue signal to a reference value corresponding to the valve type PWM signal and provides additional functions such as temperature compensation (coil heating), ramp function and the adjustment of minimum and maximum duty cycle/coil current for the control range.