This is a Burkert direct operating 2/2 way solenoid valve with 1/8 inch NPT threads and a 24 V 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 – 3 bar (-15 – 44 psi) and a maximum temperature of 60 °C (140 °F). The valve has a Kv-value of 0.09 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. The valve is fat and oil free, meaning it won’t contaminate the media. Therefore, it’s suitable for laboratory use as well as oxygen. The valve has an IP65 rating if properly connected.
Pros:
- Oil and fat free, so the valve does not contaminate the medium
- Good protection against the environment thanks to the IP65 rating
- This valve is suitable for use with oxygen
- Solenoid valves open and close very fast compared to many other valve types
- Compact valve design
- Response time less than 15 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 2871 is a direct-operated plunger solenoid valve. The 2871 valve serves primarily for proportional control, ideal for applications requiring continuous flow rate control. Depending on the model, the 2871 valve operates from 0 to a maximum of 12 bar, has a 1/8 inch port size (BSP and NPT) and can also be mounted on a sub-base. The orifice sizes ranges from 0.05 to 2.0 mm. For larger flow rates type 2873 or 2875 provide a solution. 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. If uncertain about choosing the appropriate valve or whether the 2871 valve suits your needs, read our article on 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 conical (NPT)
Function : Normally closed
Voltage : 24 V DC
Material : Brass
Seal material : FKM (FPM)
Operation : Direct
Recommended for : Air
Min pressure difference (bar) : -1
Max pressure (bar) : 3
Kv value [m3/h] : 0.09
Features : For oxygen,Fat and oil free,Proportional control
Valve bore (mm) : 2
Min temperature (°C) : -10
Max temperature (°C) : 60
Electrical connection : DIN-B (11mm)
Degree of protection (IP) : IP65
Nominal power (W) : 5
Valve ports/positions : 2/2 way
Duty cycle : 100%
Max. ambient temp. (°C) : 55
Min. ambient temperature (°C) : -10
Actuation : Plunger
QNn value (gas) (l/min) : 97
Sealing toward outside material : FKM (FPM)
PWM frequency (max) (Hz) : 1500
PWM frequency (min) (Hz) : 1400
PWM control span : 1:200
Flow direction : Below seat
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