Solenoid Valve 20x20 mm SFB flange NC Stainless steel EPDM -1-8bar/-15-116psi 24VDC 2871 20013596

This is a Burkert direct operating 2/2 way solenoid valve with 20x20 mm SFB flange 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 stainless steel housing with EPDM sealing and an orifice size of 1.2 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 - 8 bar (-15 - 116 psi) and a maximum temperature of 90 °C (194 °F). The valve has a Kv-value of 0.038 m3/h, this translates to a flow rate of 1 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 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. The valve has an IP65 rating if properly connected.

Pros:

• 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 15 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 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.