BURKERT 20032009 (Type 0121) is a direct-acting, media-separated 3/2-way pivoted armature solenoid valve engineered for controlling aggressive acids, alkaline lyes, salt solutions, and waste gases. Built with a solid PVC body, chemical-resistant FKM seals, and an internal G 3/8 port connection, this valve delivers complete hermetic isolation between fluid channels and the electromagnetic actuator.

Operating in Circuit Function C (normally closed), the valve accommodates operating pressures from 0 to 0.3 bar across liquid media and gases. It provides an 8.0 mm (5/16") orifice with a water flow capacity of 1.0 m³/h (Kv) and a normalized gas flow rate of 1,000 l/min (QNn). The epoxy-encapsulated coil runs on 24 V AC/DC (50/60 Hz) and features an integrated manual override for commissioning, functional testing, and emergency cycling.

Design and Operating Principle

Type 0121 isolates fluid contact via an elastomer diaphragm interposed directly between the valve body and the pivoted armature mechanism. Because process media cannot enter the armature cavity or contact metallic magnetic components, internal chemical buildup and corrosion are eliminated.

The pivoted armature design delivers fast direct action without requiring differential operating pressure. The coil system is molded with chemically resistant epoxy and firmly screwed into a rigid block construction to maintain alignment under mechanical vibration.

Item	Component	Material
1	Coil	Epoxy (insulation class H)
2	O-ring	FKM
3	Toggle pin	PTFE
4	Isolating diaphragm seal	FKM (70 Shore A)
5	Valve seat	PVC (polyvinyl chloride)
6	Valve body	PVC (polyvinyl chloride, DIN 8062/8061)

Fluidic Circuit Function and Port Assignment

Model 20032009 is configured in Circuit Function C (normally closed 3/2-way valve). Fluid flow enters below the valve seat, providing steady shutoff against positive backpressure.

Circuit Function	Connection 1	Connection 2	Connection 3	Flow Path De-energized	Flow Path Energized
CF C (Normally Closed)	P (Pressure inlet, NC)	R (Exhaust / return, NO)	A (Working outlet, OUT)	Port 1 (P) closed; Port 3 (A) vents to Port 2 (R)	Port 1 (P) opens to Port 3 (A); Port 2 (R) closed
CF D (Normally Open)	R	P	B	Port 2 (P) flows to Port 3 (B); Port 1 (R) closed	Port 2 (P) closed; Port 3 (B) vents to Port 1 (R)
CF E (Mixing Valve)	P1	P2	A	Port 2 (P2) flows to Port 3 (A); Port 1 (P1) closed	Port 1 (P1) flows to Port 3 (A); Port 2 (P2) closed
CF F (Distribution Valve)	A	B	P	Port 3 (P) flows to Port 2 (B); Port 1 (A) closed	Port 3 (P) flows to Port 1 (A); Port 2 (B) closed

Technical Specifications

Parameter	Value
Burkert Article Number	20032009
Valve Type Family	Type 0121
Valve Configuration	Complete direct-acting 3/2-way pivoted armature valve
Circuit Function	C (normally closed)
Orifice Size	DN 8.0 mm (5/16")
Port Thread Size	G 3/8 internal thread (DIN ISO 228/1)
Flow Capacity Kv (Water)	1.0 m³/h
Flow Capacity QNn (Gas)	1,000 l/min
Pressure Range (Liquids & Gases)	0...0.3 bar gauge
Body & Seat Material	PVC (polyvinyl chloride)
Seal Material (Internal & External)	FKM (fluororubber, 70 Shore A)
Nominal Operating Voltage	24 V AC/DC (50/60 Hz)
Voltage Tolerance	±10%
AC Power Consumption	Inrush: 30 VA; Hold: 15 VA (8 W)
DC Power Consumption	Cold: 11 W; Warm: 8 W
Permissible Duty Cycle	10% ED (10 min base cycle) with standard 8 W coil on PVC body
Maximum Switching Frequency	100 cycles/min (AC)
AC Response Times	Opening: 20 ms; Closing: 11 ms
DC Response Times	Opening: 11 ms; Closing: 8 ms
Fluid Temperature Range	-10 °C...+50 °C
Maximum Ambient Temperature	+50 °C
Maximum Kinematic Viscosity	37 mm²/s
Total Net Weight	0.38 kg

Thermal Duty Cycle Limitation with PVC Housing

Due to the lower thermal conductivity of PVC compared to metallic materials, standard 8 W coil assemblies installed on PVC housings are restricted to a 10% operating duty cycle (within a 10-minute cycle window) under continuous energization. Where 100% continuous duty (continuous energization) is required on PVC bodies, valves must be specified with high-performance electronic power-reduction coils (Option CZ05: 60 W inrush, 3 W nominal holding) or a 5 W reduced-power coil.

Dimensions and Mounting

Model 20032009 standard variant features a compact body footprint with an overall length of 65 mm.

Body Material	Thread D	Total Height B [mm]	Width E [mm]	Overall Length F [mm]
PVC (Item 20032009)	G 3/8	91	35	65
Stainless Steel 1.4401	G 1/4	89	32	76
PTFE	G 3/8	91	35	76

Mechanical mounting is accomplished via M4 × 5 mm female threaded holes located on the bottom face of the valve body, spaced according to a 38 mm × 24 mm pattern.

Electrical Connection and Compatible Accessories

The standard coil terminates in three male spade contacts conforming to DIN EN 175301-803 Form A. The matching cable plug is not included with the bare valve body and must be ordered separately.

Accessory Description	Type / Model	Voltage Range	Article Number
Cable Plug Form A without circuitry	Type 2518	0...250 V AC/DC	314802
Cable Plug Form A with status LED	Type 2518	12...24 V AC/DC	314812
Cable Plug Form A with LED and varistor	Type 2518	12...24 V AC/DC	314820
Cable Plug Form A with rectifier, LED, varistor	Type 2518	12...24 V AC/DC	314816
Standard Cable Plug Form A without circuitry	Type 2509	0...250 V AC/DC	137943
Solid-State Timer (Form A DIN EN 175301-803)	Type 1087	12...24 V AC/DC	Specification dependent
Anti-Tamper Circlip for Manual Override	Locking clip	—	013372

Manual Override Locking Clip

The manual override allows manual opening or testing without electrical power. To safeguard against accidental mechanical activation in safety-critical dosing or chemical lines, install the optional circlip (Part No. 013372).

Installation and Operation Guidelines

Piping and Position Recommendations

• Mount the valve in any spatial orientation; positioning the solenoid actuator upright is preferred to minimize particle accumulation on the seal face.
• Ensure the process piping is depressurized and flushed clean of particulate contaminants, pipe shavings, and excess thread sealant prior to installation.
• Thread G 3/8 fittings into the PVC body using compatible sealing tapes (such as PTFE tape); do not over-torque threaded connections to prevent cracking the thermoplastic port bosses.
• Verify the protective earth conductor (PE) is securely grounded through the DIN EN 175301-803 Form A plug connector.