BURKERT 51577 Type 0121 is a direct-acting, media-separated pivoted armature solenoid valve designed for controlling, shutting off, and dosing neutral and aggressive media. As a 3/2-way normally closed valve (Circuit Function C), it features a PVC body and an EPDM seal, making it highly suitable for critical and aggressive media such as alkalis, acids to medium concentrations, and alkaline washing lyes. The solenoid coil is molded with a chemically resistant epoxy, and the coil system is separated from the medium by a diaphragm.

This specific configuration (Article No. 51577) includes a 6.0 mm orifice, operates at 230 V / 50 Hz, and utilizes a gluing sleeve port connection. It is equipped with a robust, service-friendly manual override for easy start-up and testing.

General Technical Data

Property	Value
Orifice	DN 6.0 mm
Circuit function	C (3/2-way, normally closed)
Body material	PVC (resistant according to DIN 8062, 8061)
Seal material	EPDM
Weight (PVC body)	0.38 kg
Thermal insulation class	Epoxy coil class H
Duty cycle (PVC)	10 % duty cycle (10 min)
Switching frequency	Max. 100/min with AC
Voltage	230 V 50 Hz (Tolerance ±10%)
Power consumption (AC)	Inrush: 30 VA, Hold: 15 VA / 8 W
Medium temperature	-30 °C to +50 °C
Ambient temperature	Max. +50 °C
Viscosity	Max. 37 mm²/s
Degree of protection	IP65 with cable plug
Installation	As required, preferably with actuator upright

Circuit Function

Circuit function C (CF C): 3/2-way solenoid valve, direct-acting, normally closed.

Materials

No.	Element	Material
1	Coil	Epoxy
2	O-ring	EPDM
3	Toggle pin	PTFE
4	Seal	EPDM
5	Seat	PVC (resistant according to DIN 8062, 8061)
6	Valve body	PVC (resistant according to DIN 8062, 8061)

Dimensions

Body material	D	B	E	F
PVC	G 3/8	91 mm	35 mm	65 mm

(Note: The 51577 configuration utilizes a gluing sleeve connection, but shares the general PVC body dimensions shown above.)

Installation and Safety

DANGER!

Risk of injury from high pressure in the system/device ▶ Before working on equipment or device, switch off the pressure and deaerate/drain lines.

Risk of injury from electric shock ▶ Before working on the system or device, switch off the power supply and secure against reactivation. ▶ Observe the applicable accident prevention and safety regulations for electrical devices.

Installation Recommendations

• Dirt trap: For safe operation of the solenoid valve, a dirt trap (≤ 500 µm) must be installed before the valve inlet.
• Installation position: The installation position is flexible, but preferably with the actuator at the top.
• Caution with PVC bodies: Do not use the coil as a lever arm. Determine the maximum screw-in depth of the connection threads as these do not comply with any standard. Hold the device on the body using the appropriate tool (open-ended spanner) and screw into the pipeline.