This is a Burkert direct operating 2/2 way solenoid valve with 45×45 mm SFB flange 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 stainless steel housing with EPDM sealing and an orifice size of 4 mm. SFB is a Burkert specific flange design that enables compact mounting of multiple valves on a manifold. 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 – 7 bar (-15 – 102 psi) and a maximum temperature of 90 °C (194 °F). The valve has a Kv-value of 0.45 m3/h, this translates to a flow rate of 8 l/min at a differential pressure of 1 bar (for water). In imperial units: Cv = 1, which means 1 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 stainless steel housing is very durable, strong and resistant to a wide range of chemicals with the exception of chloride solutions. The EPDM (ethylene propylene diene monomer rubber) sealing is suited for neutral fluids and many chemicals, but it has poor resistance to oils and fats. 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
- Silicone free, so the valve does not contaminate the medium
- Solenoid valves open and close very fast compared to many other valve types
- Compact valve design
- Response time less than 25 ms
- Control enabled with PWM signal
- SFB flange design enables compact mounting of multiple valves on a manifold
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 2875 is a direct operated plunger solenoid valve and is primarily used for applications where flow rate control is necessary (proportional control). The valve works from 0 to 25 bar and has a 3/8 inch or 1/2 inch port size (BSP or NPT). The orifice sizes ranges from 2 to 9.5 mm. For smaller flow rates, types 2871 and 2873 provide a solution. The flow can be controlled using a digital controller (for example the Bürkert 8605 or 8611 types). Explosion-protected coils are optional. Please note that the correct sizing of the valve (Kv) is critical in flow control setups. For advice on which valve to choose and if the 2875 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 : 45×45 mm SFB
Connection type : Flange SFB
Function : Normally closed
Voltage : 24 V AC,24 V DC
Material : Stainless steel
Seal material : EPDM
Operation : Direct
Recommended for : Water,Carbon dioxide,Alcohols,Demineralized water
Min pressure difference (bar) : -1
Max pressure (bar) : 7
Kv value [m3/h] : 0.45
Features : Silicone free,Proportional control
Approval : Atex Zone 1,Atex Zone 2,IECEx Zone 1,IECEx Zone 2
Valve bore (mm) : 4
Min temperature (°C) : -30
Max temperature (°C) : 90
Electrical connection : Cable
Degree of protection (IP) : IP65
Nominal power (W) : 16
Freq. input voltage (Hz) : 50 Hz to 50 Hz
Valve ports/positions : 2/2 way
Duty cycle : 100%
Max. ambient temp. (°C) : 40
Cable length (m) : 3
Min. ambient temperature (°C) : -30
Actuation : Plunger
QNn value (gas) (l/min) : 485
Sealing toward outside material : EPDM
PWM frequency (max) (Hz) : 500
PWM frequency (min) (Hz) : 400
PWM control span : 1:100
Flow direction : Below seat
Explosion safety code : IECEx – II 2 G Ex mb IIC T4 Gb,ATEX – Ex mb IIC T4 Gb
Explosion safety : Ex-Zone 1
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