This is a Burkert direct operating 2/2 way solenoid valve with G 1/8 inch threads and a 24 V AC/DC coil. Designed for proportional flow control through a PWM signal. The duty cycle of the signal determines the coil current, which directly correlates to the plunger position. Optionally, the valve can also be driven with DC voltage. The valve has a brass housing with FKM sealing and an orifice size of 2 mm. The circuit function of the solenoid valve is normally closed, which means the valve opens when voltage is applied. As it is direct operating, no pressure differential over the valve is needed to open the valve. Suitable for a pressure of -1 – 6 bar (-15 – 87 psi) and a maximum temperature of 90 °C (194 °F). The valve has a Kv-value of 0.1 m3/h, this translates to a flow rate of 2 l/min at a differential pressure of 1 bar (for water). In imperial units: Cv = 0, which means 0 GPM @ 1 psi pressure drop. For many applications it is enough to select a valve based on the thread size and orifice diameter. For more accurate sizing, use the Kv-value with our easy to use valve sizing calculator. The brass housing is durable, suitable for neutral fluids and resistant to many chemicals. The FKM (fluorine rubber or Viton) sealing has excellent chemical properties, is suited for most oils and solvents but it cannot handle hot water or steam. Please note that the internal valve parts, such as the stainless steel plunger and springs, are also in contact with the medium and must be chemically compatible. Consult our chemical resistance chart to verify compatibility of housing and seals with the medium. The valve can be proportionally controlled by using a digital controller such as, for example, the Bürkert 8605 or 8611 types. Thanks to the ATEX and IECEx certification, this solenoid valve is suited for explosive environments. The valve has an IP65 rating if properly connected.
Pros:
- ATEX-certified
- Good protection against the environment thanks to the IP65 rating
- Solenoid valves open and close very fast compared to many other valve types
- Compact valve design
- Response time less than 20 ms
- Control enabled with PWM signal
Cons:
- Solenoid valves are very sensitive to dirt and can only be used with clean liquids and gases
- The coil may get hot when energized. A well ventilated environment is recommended
Series:
The Bürkert 2873 is a direct-operated plunger solenoid valve and is primarily used for applications where flow rate control is necessary (proportional control). Depending on the model, the valve works from 0 up to 16 bar and has a 1/8 inch or 1/4 inch port size with BSPP or NPT thread or can be mounted on sub-base flange. The orifice sizes ranges from 0.8 to 6 mm. The flow can be controlled using a digital controller (for example the Bürkert 8605 or 8611 types). Please note that the correct sizing of the valve (Kv) is critical in flow control setups. For smaller flow rates, type 2871 provides a solution. For larger flow rates, please consider 2875. For advice on which valve to choose and if the 2873 valve is right for you, please read our article about proportional solenoid valves or contact our technical support.
Please note: this product is made to order and can unfortunately not be returned.
Specifications
Connection size : 1/8 inch
Connection type : Inner thread cylindrical BSPP-G
Function : Normally closed
Voltage : 24 V AC,24 V DC
Material : Brass
Seal material : FKM (FPM)
Operation : Direct
Recommended for : Water,Air,Oil,Fuel,Lubricant
Min pressure difference (bar) : -1
Max pressure (bar) : 6
Kv value [m3/h] : 0.1
Features : Proportional control
Approval : Atex Zone 1,Atex Zone 21,Atex Zone 2,Atex Zone 22,IECEx Zone 1,IECEx Zone 21,IECEx Zone 2,IECEx Zone 22
Valve bore (mm) : 2
Min temperature (°C) : -10
Max temperature (°C) : 90
Electrical connection : Cable
Degree of protection (IP) : IP65
Nominal power (W) : 9
Freq. input voltage (Hz) : 50 Hz to 50 Hz
Valve ports/positions : 2/2 way
Duty cycle : 100%
Max. ambient temp. (°C) : 45
Cable length (m) : 3
Min. ambient temperature (°C) : -10
Actuation : Plunger
QNn value (gas) (l/min) : 108
Sealing toward outside material : FKM (FPM)
PWM frequency (max) (Hz) : 800
PWM frequency (min) (Hz) : 600
PWM control span : 1:100
Flow direction : Below seat
Explosion safety code : IECEx – II 2 G Ex mb IIC T4 Gb,ATEX – Ex mb IIIC T130°C Db,IECEx – II 2 G Ex mb IIC T5 Gb,IECEx – II 2 D Ex mb IIIC T130°C Db,ATEX – Ex mb IIC T4 Gb,ATEX – Ex mb IIC T5 Gb
Explosion safety : Ex-Zone 1
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