Burkert Type 2873 (Article No. 327402) 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 ranges and dry gases.

Key Features

• Excellent control range (1:100 operating range)
• Very good response sensitivity (< 0.25% FS)
• Compact valve design
• Frictionless assembled plunger for precise adjustment
• Optional explosion-protected coil (Type 06xx)

General Technical Data

Property	Value
Circuit Function	A - normally closed - inlet port 1 (P/NC)
Body Material	Stainless steel
Seal Material	FKM (Fluor rubber)
Port Connection	G 1/4 Internal thread
Orifice Size	4.0 mm
Operating Voltage	24 V DC
Pressure Range	-1 to 2 bar (Differential pressure max: 2 bar)
Medium Temperature	-10 °C to +90 °C
Ambient Temperature	-10 °C to +55 °C
Kv Value (Water)	0.32 m³/h
QNn Value (Gas)	345 l/min
PWM Frequency	600 Hz (min) to 800 Hz (max)
Degree of Protection	IP65 (with suitable connector)

Performance Specifications

Flow Characteristic

Determination of the Kv value:

Pressure drop	Kv value for liquids [m³/h]	Kv value for gases [m³/h]
Sub-critical $p_2 > \frac{p_1}{2}$	$= Q \sqrt{\frac{\rho}{1000\Delta p}}$	$= \frac{Q_N}{514}\sqrt{\frac{T_1\rho_N}{p_2\Delta p}}$
Supercritical $p_2 < \frac{p_1}{2}$	$= Q \sqrt{\frac{\rho}{1000\Delta p}}$	$= \frac{Q_N}{257p_1}\sqrt{T_1\rho_N}$

Note: $T_1$ in Kelvin [(273 + t) K]. Absolute pressure is used for calculations.

Exemplary Characteristic Curve

Note on Sizing

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 the valve is 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.

Product Operation

Control Unit Recommendation

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) and ramp functions.

Dimensions (Threaded Version)

Dimensions in mm. For G 1/4 thread, dimension A is G 1/4 and dimension B is 12 mm.

Safety and Explosion Protection (Optional Type 06xx Coil)

When equipped with the optional Type 06xx explosion-proof coil, the device is suitable for potentially explosive areas.

Basic Safety Instructions

• Danger – high pressure: Before loosening the lines and valves, turn off the pressure and vent the lines.
• Risk of electric shock: Before reaching into the device, switch off the power supply and secure to prevent reactivation.
• Risk of explosion: Following assembly, the solenoid coil is part of a closed system. If used in a potentially explosive area, there is a risk of explosion if the system is opened during operation. Do not remove or open the system during operation.
• Electrostatic discharge: Take suitable measures to ensure that no electrostatic discharges can build up in the explosion-risk area. Clean the device surface by gently wiping it with a damp or antistatic cloth only.