BURKERT 20079888 is a Type 7011 direct-acting 2/2-way plunger valve designed for shut-off, dosing, filling, and ventilating neutral gaseous and liquid media. Operating in circuit function A (normally closed, NC), the valve features an orifice diameter of 1.2 mm (DN 1.2) and a calibrated water Kv flow rate of 0.045 m³/h. Built with a wetted stainless steel 1.4305 / 303 body and FKM (fluor rubber) seals, article 20079888 connects via NPT 1/8 female threaded ports and controls pressures from 0 to 16 bar. It is powered by a 24 V DC solenoid coil and engineered specifically for oxygen service, incorporating BAM-tested non-metallic components and specialized cleaning and packaging to remain completely free of oil, grease, and silicone according to DIS 1000020797.

Key Technical Specifications

Specification Parameter	Value / Technical Rating
Manufacturer Model / Type	Type 7011
Article Number (MPN)	20079888
Circuit Function	A (2/2-way valve, normally closed)
Fluidic Connection Ports	2 ports, flow over seat from 1(P) to 2(A)
Port Connection Size	NPT 1/8 internal thread
Orifice Size (DN)	1.20 mm (3/64")
Kv Factor (Water acc. to DIN EN 60534-2-3)	0.045 m³/h
Nominal Operating Pressure	0 to 16 bar (0 to 1.6 MPa)
Operating Voltage	24 V DC (±10% voltage tolerance)
Body Material (Wetted)	Stainless steel 1.4305 / 303
Seat & External Sealing	FKM (Fluor rubber)
Medium Temperature Range	-10 °C to +60 °C (design limit up to +100 °C)
Permissible Ambient Temperature	-10 °C to +55 °C
Viscosity Rating	Max. 21 mm²/s
Duty Cycle	100% ED continuous operation
Switching Times (DIN ISO 12238)	Opening: 8 to 15 ms, Closing: 10 to 17 ms
Electrical Interface	Form B industrial standard plug pins (for Type 2507 plug)
Enclosure Ingress Protection	IP65 according to EN 60529 (with mounted cable plug)
Cleanliness & Application Rating	Oxygen version (BAM tested), free of oil and grease (DIS 1000020797)

Design and Materials of Construction

Type 7011 valves employ a direct-acting plunger design. The core guide tube and the stopper are welded together into a single hermetic assembly to ensure superior pressure containment, structural rigidity, and leak tightness under cyclic operation.

Item No.	Component Part	Standard Material
1	Nut	Steel DIN 176, thick-film passivated (KOSA0101)
2	Stopper	Stainless steel 1.4113 / 434
3	Core guide tube	Stainless steel 1.4303 ST / 305L (welded to stopper)
4	Shading ring	Copper (optional silver for aggressive media)
5	Core / Plunger	Stainless steel 1.4113 / 434
6	Return spring	Stainless steel 1.4310 / 301
7	Core seal / Seat seal	FKM (fluor rubber)
8	Valve body	Stainless steel 1.4305 / 303 (for article 20079888)
9	O-ring	FKM (fluor rubber)
10	Flange / Body base plate	Nickel-plated surface finish (stainless steel models)
11	Solenoid coil	Epoxy encapsulation, class H insulation

Dimensional Details

BURKERT 20079888 features an in-line threaded valve body with NPT 1/8 connections conforming to industrial standard form B interface geometry. Dimensions are provided in millimeters.

Port Connection	Thread A	Dimension B [mm]	Dimension C [mm]	Dimension D [mm]
Thread CF A (Circuit Function A)	M5	5	20	10
Thread CF A (Circuit Function A)	G 1/8	8	25	15
Thread CF A (Article 20079888)	NPT 1/8	7	25	15
Thread CF B (Circuit Function B)	G 1/8	8	34	14
Thread CF B (Circuit Function B)	NPT 1/8	7	34	14

The slipped-over solenoid coil can be loosened by unscrewing the upper hex nut and rotated through 4 x 90° increments (or 2 x 180° increments when mounted on block manifolds), allowing flexible cable plug positioning within confined instrumentation enclosures.

Electrical Connection and Accessories

Article 20079888 is supplied with industrial standard form B plug pins and is designed to mate with BURKERT Type 2507 cable plugs. The delivery excludes the cable plug, which must be selected separately according to control voltage and indicator requirements.

Cable Plug Variant	Voltage Rating	Features / Protective Circuit	Ordering Article No.
Type 2507 Form B	2 to 250 V AC/DC	Without internal wiring (standard version)	423845
Type 2507 Form B	24 V AC/DC	With integrated operational LED indicator	423849
Type 2507 Form B	12 to 24 V AC/DC	With LED and free-wheeling protective diode	423851
Type 2507 Form B	12 to 24 V AC/DC	With full-wave rectifier, LED, and varistor	423853
Type 2507 Form B	2 to 250 V AC/DC	With full-wave rectifier, LED, and varistor	423854

Operating Performance and Response Times

Valve response times are measured according to DIN ISO 12238:2001 at +20 °C using 6 bar air pressure at the valve outlet. Opening corresponds to a pressure build-up from 0% to 10%, while closing corresponds to a pressure decay from 100% to 90%.

• Opening time: 8 to 15 ms
• Closing time: 10 to 17 ms
• Continuous rating: 100% ED (continuous duty) at ambient temperatures up to +55 °C
• DC coil power consumption: Nominal 5.5 W to 7 W (cold: 7 W, stabilized warm: 5.5 W)

Installation and Maintenance Instructions

Installation Guidelines

• Clean and flush all process piping prior to installing the valve. Trapped particles can compromise seal seating.
• Mount a fine inline strainer or dirt trap (mesh width 0.2 mm to 0.4 mm) upstream of the valve inlet.
• Ensure media flow matches the valve body marking: inlet port 1(P) to outlet port 2(A).
• Threaded connections should be sealed using PTFE tape. Do not use the solenoid body as a lever when tightening into the pipework.
• Maintain an upright coil position whenever practical.

Electrical Safety

• Verify that the power supply is disconnected and locked out before establishing electrical connections.
• Always attach the protective grounding conductor and confirm electrical continuity between the ground pin and the valve body / core guide tube.
• Never energize the solenoid coil when it is detached from the core guide tube or without the armature assembled; dry energization leads to rapid overheating and irreversible coil burnout.
• Tighten the top fastening nut to a maximum torque of 2.8 Nm. Tighten the Type 2507 plug center screw to 0.3 Nm.

Oxygen and High-Purity Service

• BURKERT 20079888 is certified under variable code NL02 for gaseous oxygen service, featuring non-metallic materials tested by BAM (Bundesanstalt für Materialforschung und -prüfung).
• The valve is processed, degreased, and hermetically packaged under specification DIS 1000020797 to eliminate residual oils, greases, and silicones.
• Unpack the valve only immediately before installation in a clean environment to prevent hydrocarbon contamination.

Ordering Configurations and Related Variants

While article 20079888 specifies an NPT 1/8 threaded stainless steel configuration, Type 7011 is available in related body materials and connection geometries sharing the same functional platform.

Article No.	Circuit Function	Orifice DN [mm]	Kv (Water) [m³/h]	Connection	Body Material	Seal Material	Voltage / Duty	Pressure Range
20079888	CF A (NC)	1.2	0.045	NPT 1/8	Stainless steel	FKM	24 V DC / 100%	0 to 16 bar
375828	CF A (NC)	1.2	0.045	G 1/8	Stainless steel	FKM	24 V DC / 100%	0 to 23 bar
375821	CF A (NC)	1.2	0.045	G 1/8	Brass	FKM	24 V DC / 100%	0 to 23 bar
389721	CF A (NC)	1.2	0.045	M5	Stainless steel	FKM	24 V DC / 100%	0 to 23 bar
380543	CF A (NC)	1.2	0.045	M5	Brass	FKM	24 V DC / 100%	0 to 23 bar
375844	CF A (NC)	1.2	0.045	Flange (FK01)	Stainless steel	FKM	24 V DC / 100%	0 to 23 bar
375836	CF A (NC)	1.2	0.045	Flange (FK01)	Brass	FKM	24 V DC / 100%	0 to 23 bar