Burkert Type 2873 (Article No. 345492) is a direct-acting 2-way standard solenoid control valve used as the regulating unit in control loops. Due to an elastomeric seat seal, the valve closes tight (integrated shut-off function) up to the DN specific nominal pressure. The plunger of the valve is assembled frictionless, which leads to an extraordinary adjustment characteristic. This valve is particularly suitable for demanding control tasks, including high control range applications and dry gases.

Key Features

• Excellent range and very good response
• Compact valve design
• Orifice sizes ranging from 0.8 to 6 mm (2.0 mm for SKU 345492)
• Optional explosion-protected coil available

Technical Data

Property	Value
Circuit function	A (2/2-way proportional control valve, normally closed)
Hysteresis	< 5%
Repeat accuracy	< 0.5% FS
Response sensitivity	< 0.25% FS
Setting range	1:200
Actuating time (10...90%)	< 20 ms
Duty cycle	100% continuous operation
Degree of protection	IP65

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 adjustment of minimum/maximum duty cycle for the control range.

Performance Specifications

Characteristic Curve Dimensioning

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 the desired flow range is achieved and, when fully open, a sufficient portion of the total pressure drop occurs across the valve. Reference value: $\Delta p_{valve} > 25%$ of the total pressure drop.

Dimensions

The following dimensions apply to the sub-base version (FK01), which corresponds to the flange connection of this model.

Approvals and Conformities

Depending on the specific configuration, Type 2873 valves can be supplied with various approvals:

• Explosion protection: ATEX (II 2 G Ex mb IIC T4...T5 Gb, II 2 D Ex mb IIIC T130 °C Db) and IECEx.
• North America: UL Recognized for the USA (UL 429).
• Hygiene: FDA and USP compliant materials, EC Regulation 1935/2004.