BURKERT 20009661 (Type 7012) is a direct-acting 3/2-way plunger solenoid valve engineered for blocking, dosing, filling, and venting neutral gaseous and liquid media such as compressed air, water, hydraulic oil, and technical vacuum. Configured in Circuit Function C (normally closed), the valve maintains pressure port 1 (P/NC) shut while connecting outlet port 2 (A/OUT) to exhaust port 3 (R/NO) in the de-energized state. Upon electrical actuation, the internal plunger lifts against the core spring, opening flow from port 1 to port 2 while isolating exhaust port 3.

Constructed with a brass valve body, internal NPT 1/8 process connections, and an internal orifice of DN 1.6 mm (1/16"), the unit operates across a pressure span from 0.00 bar up to 7.50 bar (0 to 109 psi) without requiring differential pilot pressure. The stopper and core guide tube are welded together to increase pressure resistance and internal leak tightness. The valve is driven by a 24 V DC epoxy-encapsulated coil (insulation class H) featuring a form B plug connection according to industrial standards, achieving an ingress protection rating of IP65 when coupled with an appropriate cable plug.

Technical Specifications

Specification Parameter	Value
Manufacturer Type	7012
Ident Number (Article / SKU)	20009661
Circuit Function	C (3/2-way, direct-acting, normally closed)
Fluidic Ports	3 ports, 2 switching positions
Nominal Orifice (DN)	1.6 mm (1/16")
Flow Factor Kv (Water)	0.06 m³/h
Flow Coefficient Cv (Water)	0.07 gpm
Operating Pressure Range	0.00 – 7.50 bar (0 – 109 psi)
Port Connection	NPT 1/8 internal thread
Nominal Operating Voltage	24 V DC (tolerance ±10%)
Nominal Power Consumption	7 W cold, 5.5 W warm (DC)
Duty Cycle	100% ED continuous operation
Switching Time (DIN ISO 12238:2001)	Opening: 8–12 ms; Closing: 8–12 ms
Medium Temperature Range	-10 °C to +100 °C (+14 °F to +212 °F)
Ambient Temperature Range	-10 °C to +55 °C (up to +75 °C depending on coil power)
Maximum Medium Viscosity	21 mm²/s (21 cSt)
Body Material	Brass
Seat & External Seal Material	FKM (fluororubber)
Solenoid Thermal Insulation Class	Epoxy coil class H
Electrical Connection Sort	Plug pattern form B according to industrial standard
Protection Type	IP65 (with properly attached cable plug)
Conformity & Certifications	cURus Recognized (UL 429, CAN/CSA-C22.2 No. 139), CE

Circuit Function & Flow Geometry

BURKERT 20009661 is designated as Circuit Function C (CF C), functioning as a direct-acting three-way normally closed valve. The flow path is routed below the valve seat.

• De-energized position: Port 1 (P) is closed by the lower valve seal. Working port 2 (A) vents directly into exhaust port 3 (R).
• Energized position: The solenoid draws the magnetic core up toward the fixed stopper. Port 3 (R) is sealed by the upper plunger seal, opening fluid delivery from supply port 1 (P) to working port 2 (A).

Materials of Construction

Every fluid-wetted and structural component in the Type 7012 standard variant is selected for mechanical endurance and chemical compatibility with neutral industrial media.

Item	Component	Material
1	Lock nut	DIN 176, surface thick-film passivated (KOSA0101)
2	Stopper	Stainless steel 1.4113 / AISI 434
3	Shading ring	Copper (silver optional)
4	Core (plunger)	Stainless steel 1.4113 / AISI 434
5	Core guide tube	Stainless steel 1.4303 / AISI 305L (welded to stopper)
6	Core return spring	Stainless steel 1.4310 / AISI 301
7	Housing O-ring	FKM (fluororubber)
8	Seat seal	FKM (fluororubber)
9	Valve body	Brass
10	Flange plate	Surface thick-film passivated (KOSA0101)
11	Solenoid coil body	Epoxy encapsulation

Dimensions and Port Connections

The standard threaded variant features a compact footprint. For the NPT 1/8 brass body configuration, the unit weight is approximately 146 g (with 24.5 mm coil).

Port Connection	Thread Depth A [mm]	Thread Depth A [in]	Body Width B [mm]	Body Width B [in]	Body Length C [mm]	Body Length C [in]	Port Center Height D [mm]	Port Center Height D [in]
M5	5	0.19	20	0.78	14	0.55	—	—
G 1/8	8	0.31	25	0.98	19.5	0.74	—	—
NPT 1/8	7	0.31	25	0.98	19.5	0.74	—	—

Fluid Port Identification

Port connections on the body correspond to the circuit function markings cast into the valve housing.

Circuit Function	Connection Position *	Connection Position **	Connection Position ***
Function C (WW C)	1 (P) - Pressure Inlet	3 (R) - Exhaust / Return	2 (A) - Working Outlet
Function D (WW D)	3 (R) - Exhaust / Return	1 (P) - Pressure Inlet	2 (B) - Working Outlet
Function A (WW A)	1 (P) - Pressure Inlet	To lock (plugged)	2 (A) - Working Outlet
Function B (WW B)	To lock (plugged)	2 (B) - Working Outlet	1 (P) - Pressure Inlet

Electrical Connection & Matching Accessories

BURKERT 20009661 utilizes contact pins arranged according to industrial standard form B (contact gap 11 mm). The valve is delivered without a cable plug. To complete the electrical installation and maintain IP65 sealing, pair the valve with a Type 2507 cable plug.

Plug Model	Circuit Configuration	Voltage Rating	Article Number
Type 2507 Form B	Without wiring (Standard)	2...250 V AC/DC	423845
Type 2507 Form B	With LED status indicator	24 V AC/DC	423849
Type 2507 Form B	With LED and free-wheeling diode	12...24 V AC/DC	423851
Type 2507 Form B	With rectifier, LED, and varistor	2...250 V AC/DC	423854
Type 2507 Form B	With rectifier, LED, and varistor	12...24 V AC/DC	423853

Cable Plug Delivery

Each Type 2507 cable plug assembly includes a flat elastomer gasket and a center fastening screw. The fastening screw must be tightened to a maximum torque of 0.3 Nm to safeguard terminal threads.

Coil Rotation Procedure

The solenoid coil can be indexed in four directions at 90° intervals (or two 180° positions during manifold block installations) to facilitate cable dressing.

1. Disconnect the electrical power supply and vent system pressure.
2. Loosen the top lock nut (item 1) using an open-end wrench.
3. Rotate the solenoid coil (item 2) to the required orientation over the armature tube (item 3).
4. Retighten the lock nut to a maximum torque of 2.8 Nm.
5. Verify electrical continuity between the protective earth terminal and the valve body before re-energizing.

Installation and Safety Guidelines

Pressure and High-Voltage Hazards

Isolate the system pressure and depressurize all connected process lines before attempting mechanical installation or disassembly. Disconnect the power supply and prevent accidental reactivation before touching electrical terminals. Prolonged activation causes elevated coil surface temperatures; do not handle hot coils with bare hands.

Operating Restrictions

• Do not use the solenoid valve outdoors.
• Connecting the coil to electrical power without the internal armature assembled causes immediate overheating and functional destruction of the coil winding.
• Never use the solenoid coil body as a lever arm when threading the valve into piping.

Piping & Filtration Recommendation

• Check process pipelines for particulate contaminants prior to assembly.
• Install a dirt trap upstream with a mesh width of 0.2 to 0.4 mm to prevent debris from fouling the plunger seal seats.
• Seal NPT 1/8 male threads with PTFE sealing tape, holding the brass valve body securely with an open-end wrench.

Assembly Torque Limits

• Coil fastening top nut: Maximum 2.8 Nm
• Type 2507 cable plug fastening screw: Maximum 0.3 Nm

Maintenance and Spare Parts

Type 7012 valves operate maintenance-free under specified medium and ambient limits. When servicing or replacing worn subassemblies, only genuine BURKERT spare parts should be utilized.

• Lock nut (1): Maximum tightening torque 2.8 Nm
• Solenoid coil (2): Orderable via device identification number 20009661
• Armature set (3): Includes internal plunger, core spring, and guide tube assembly