BURKERT 20022289 (Type 2000 CLASSIC) is an externally piloted 2/2-way pneumatic angle seat valve designed for shut-off control of liquids, gases, and steam in hygienic and industrial process applications. The valve incorporates a cast CF3M stainless steel body with ASME BPE clamp ends (DN 15, 1/2" tube specification, 25.0 mm clamp outer diameter) and a size 50 (D) polyamide (PA) pneumatic piston actuator. Configured in Control Function A (normally closed, NC), the valve closes against the medium flow by internal spring force and opens when pilot air between 4.1 bar and 10 bar is applied to the lower pilot air port.

Flow enters underneath the valve seat, utilizing fluid pressure to assist opening while preventing hydraulic water hammer in liquid pipework. Tight shut-off is ensured across a 0 to 16 bar operating pressure range by a durable PTFE seat seal and a self-adjusting PTFE V-ring packing gland with spring compensation. Certified to DIN EN 12266-1 Leakage Rate A and compliant with PN 25 / Class 150 pressure boundaries, article 20022289 is CIP and SIP cleanable, rated for medium temperatures from -10 °C to +185 °C, and supplied with an EN 10204 3.1 inspection certificate.

Product Architecture and Operating Principle

BURKERT 20022289 consists of a pneumatic piston actuator and a flow-optimized 2/2-way angle seat valve body. The actuator housing is molded from durable polyamide (PA) and features an integrated optical position indicator visible through a clear polycarbonate cover.

Item	Description	Function
1	Transparent cover with position indicator	Provides visual optical indication of valve open/closed position
2	Actuator cover	Encloses the preloaded actuator spring package
3	Actuator housing (Polyamide PA)	Houses the pneumatic piston and return spring
4	Relief bore (overflow leak port)	Enables visual leak detection if stem packing gland requires service
5	Pipeline connection	ASME BPE clamp ferrule for sanitary pipe coupling
6	Flow direction arrow	Cast body marking indicating flow under the seat
7	Valve body (CF3M / 316L)	High-flow Y-pattern angle seat fluid chamber
8	Body neck connection with spanner flats	Threaded mechanical interface between body and actuator
10	Lower pilot air connection (G 1/4)	Air inlet for opening stroke in Control Function A
11	Upper pilot air connection (G 1/4)	Vent/exhaust port in single-acting Control Function A

Control Function and Flow Under Seat

In Control Function A (SFA / CFA), the valve is held in the closed position by an internal stainless steel spring (1.4310) when no pilot pressure is present. The closing force is transmitted through a stainless steel spindle (1.4401 / 1.4404) directly to the CF3M swivel plate fitted with a precision PTFE seat seal.

Flow direction below the seat is specified for liquids, steam, and gases. Because media pressure acts on the underside of the swivel plate, line pressure assists in lifting the valve disc during opening. Closing against the oncoming flow avoids line shock and water hammer. Stem sealing is accomplished by a self-adjusting packing gland comprising filled PTFE V-rings energized by a stainless steel compensation spring, maintaining long-term sealing without manual maintenance.

Technical Specifications

Parameter	Specification	Source Standard / Condition
Article Number	20022289	Burkert Master Catalog
Model Family	Type 2000 CLASSIC	2/2-way angle seat valve
Nominal Diameter	DN 15 (NPS 1/2")	Seat orifice diameter: 15 mm
Port Connection Type	Clamp connection	ASME BPE / DIN 11866 series C
Clamp Flange Outer Diameter	25.0 mm (0.984")	ASME BPE clamp size
Tube Dimensions	OD 12.7 mm x ID 9.4 mm	Wall thickness: 1.65 mm (0.065")
Control Function	Function A (NC)	Normally closed by spring force
Flow Direction	Below valve seat	Closes against flow, flow to open
Water Flow Coefficient Kv	1.6 m³/h	+20 °C water, 1 bar Δp, free discharge
Operating Pressure Range	0 to 16 bar(g)	SFA with PTFE seal, actuator 50 (D)
Nominal Pressure Rating	PN 25 / Class 150	DIN EN 1333 / DIN EN 1759
Pilot Pressure Range	4.1 to 10 bar(g)	Single-acting Control Function A
Pilot Air Port	G 1/4 internal thread	360° stepless rotatable connection
Control Medium	Instrument air, neutral gases	Filtered, non-lubricated or lubricated
Medium Temperature	-10 °C to +185 °C	Continuous process fluid limit
Ambient Temperature	-10 °C to +60 °C	Derated to +40 °C at +185 °C medium
Seat Leakage Rate	Leakage Rate A	DIN EN 12266-1 (air test medium)
Valve Body Material	Stainless steel CF3M	Precision cast 316L equivalent
Actuator Material	Polyamide (PA)	Size 50 (D), housing OD 64 mm
Seat Seal Material	PTFE	Polytetrafluoroethylene
Protection Rating	IP67 / NEMA 4X	EN 60529 / IEC 60529
Sound Pressure Level	< 70 dB(A)	Operating noise limit
Fluid Viscosity	Max. 600 mm²/s	Dynamic process media
Cleanability	CIP and SIP capable	Steam-in-place and clean-in-place
Inspection Certificate	EN 10204 3.1 enclosed	Manufacturer material and test report

Materials of Construction

Item No.	Component	Material Specification
1	Transparent cover	Polycarbonate (PC)
2	Pilot air connection inserts	Stainless steel 1.4305
3	Actuator housing	Polyamide (PA)
4	Piston seal	NBR
5	Packing gland	PTFE V-rings (filled) with spring compensation
6	Actuator spring	Stainless steel 1.4310
7	Guide tube	Stainless steel CF8 / CF3M
8	Wiper ring	Solid PTFE
9	Body seal	Graphite (PTFE optional)
10	Valve spindle	Stainless steel 1.4401 / 1.4404 (316 / 316L)
11	Retention pin	Stainless steel 1.4401 / 1.4404
12	Valve seat seal	PTFE (virgin polytetrafluoroethylene)
13	Valve body	Stainless steel CF3M (cast 316L)
14	Swivel plate (seat disc)	Stainless steel CF3M / 1.4404 / 1.4401

Dimensions and Installation Geometry

Dimension Parameter	Value (mm)	Description
DN / NPS	DN 15 / NPS 1/2"	Nominal process line size
Face-to-face length LC	130 mm	Total body length between clamp ferrule faces
Center-to-port length CC	49.0 mm	Centerline of stem to inlet clamp face
Clamp outer diameter ∅ D1 C	25.0 mm	Ferrule collar diameter (ASME BPE 1/2")
Tube outer diameter ∅ D2 C	12.7 mm	Tube outer diameter
Tube wall thickness SC	1.65 mm	Tube wall thickness (0.065")
Tube inner diameter	9.4 mm	Calculated process bore (12.7 mm - 2 × 1.65 mm)
Actuator size	50 (D)	Piston actuator designation
Actuator outer diameter ∅ A	64 mm	Actuator housing diameter
Actuator height B / H	145 mm	Centerline of body to top of actuator cap
Pilot port height K / M	129 mm	Centerline of body to pilot air port center
Disassembly clearance BS / HS	216 mm	Vertical clearance required for actuator removal
Pilot air connection P	G 1/4	Internal thread for pneumatic hose fitting
Body tightening torque	45 Nm (+10/-5 Nm)	Spanner flat tightening torque to body neck

Operating Limits and Temperature Derating

Operating pressure limits are governed by the mechanical ratings of the CF3M valve body and the thermal limits of the PTFE seat seal according to DIN EN 12516-1 PN 25 and ASME B16.34 Class 150:

Medium Temperature (°C)	DIN EN 12516-1 PN 25 Limit (bar)	ASME B16.34 Class 150 Limit (bar)	20022289 Maximum Operating Pressure (bar)
-10 to +38 °C	25.0	19.0	16.0
+50 °C	25.0	18.4	16.0
+100 °C	24.5	16.2	16.0
+150 °C	22.4	14.8	14.8
+185 °C	20.9	14.0	14.0

For polyamide (PA) actuators in size 50 (D), process heat conducted through the spindle into the actuator assembly requires ambient temperature derating. While the valve operates up to +60 °C ambient at low-to-medium fluid temperatures, process fluid at +185 °C restricts maximum permissible ambient temperature to +40 °C to prevent actuator overheating.

Operating Limits Caution

Operating pressures must remain below the saturation curve of steam to avoid cavitation and fluid flashes. If process temperature reaches +185 °C, ensure ambient temperature around the actuator does not exceed +40 °C.

Installation and Pneumatic Connection

Prior to installing BURKERT 20022289, flush the piping thoroughly to eliminate swarf, welding slag, and particulate contamination. Ensure connecting sanitary clamp gaskets and pipe ends are aligned without mechanical strain.

• The valve can be mounted in any orientation, but upright positioning with the actuator facing upwards is recommended.
• Confirm media flow follows the direction arrow cast into the valve body (inlet below seat).

Stepless 360° Actuator Orientation

The control air connection can be aligned steplessly through 360° to accommodate tight piping layouts:

1. Clamp the CF3M valve body securely in a vice or holding fixture.
2. Apply 5.0 bar compressed air to the lower pilot port (10) to lift the PTFE seal off the seat disc, preventing seat tearing during rotation.
3. Place an open-end wrench on the hexagon flats of the actuator neck and rotate only in the direction shown in the diagram until reaching the desired port position.
4. Ensure the body connection torque remains tightened to 45 Nm (+10/-5 Nm).

Actuator Rotation Precaution

Rotate the actuator only in the direction indicated on the housing. Turning in the opposite direction risks loosening the body-to-actuator connection, causing external leakage.

Pneumatic Connection

• Connect clean, dry compressed air (or neutral gas) to the lower pilot connection (marked 10). Operating pressure must be maintained between 4.1 bar and 10 bar.
• The upper port (11) vents air during stroke cycling. In aggressive or washdown environments, connect a pneumatic hose to port 11 to vent into clean ambient air.

Commissioning, Maintenance and Troubleshooting

Prior to pressurizing process lines, test actuator switching by cycling pilot air pressure. Verify rapid stroke response via the transparent visual position indicator.

Regular Inspection Schedule

Inspection Point	Observation	Corrective Action
Media Clamp Connection (1)	Fluid seepage at clamp ferrule joint	Re-seat gasket or replace sanitary clamp seal
Relief Bore / Overflow Port (2)	Moisture or media discharge at weep hole	Spindle packing gland worn: replace packing seal kit
Seat Disc / Swivel Plate (3)	Internal leakage past closed seat	PTFE seal worn or fouled: clear debris or replace seat disc
Body Neck Joint	Fluid leakage at body-actuator interface	Check graphite gasket, re-torque neck joint to 45 Nm

Troubleshooting Guide

Symptom	Probable Cause	Remedial Action
Actuator does not switch	Pilot air connected to wrong port	Connect pilot supply to lower port (10) for Control Function A
	Pilot pressure below 4.1 bar	Increase pilot air supply pressure to 4.1–10 bar
	Media pressure exceeds 16 bar	Regulate process fluid pressure within 0–16 bar range
	Reversed process flow direction	Verify line flow matches cast body arrow (below seat)
Valve seat does not seal	Debris trapped between seat and disc	Flush line; install upstream strainer (mesh < 1 mm)
	PTFE seat seal worn or damaged	Replace valve swivel plate assembly
Leakage at relief bore	Spindle V-ring packing gland worn	Install replacement packing gland set with assembly tool

Ordering and Accessory Reference

BURKERT 20022289 can be accessorized with direct-mount automation units to support discrete process automation:

• Direct-Mount 3/2-Way Pilot Solenoid Valves: Type 7012 (banjo connection with G 1/4 hollow bolt, Part No. 20077514 for 24 V DC, Part No. 20077519 for 230 V/50 Hz; matching Type 2507 Form B cable plug Part No. 423845 / 423849).
• Electrical Position Feedback Unit: Type 8697 integrated position indicator designed for hygienic CLASSIC valves, featuring mechanical or inductive limit switches with optical LED status (IP65/IP67).
• Proximity Switch Adaptation: Type 2XXX inductive proximity sensor mounting brackets for external position sensing.
• Stroke Limiters: Type 2XXX mechanical minimum and maximum stroke limiting devices with optical position indicators.
• Original Maintenance Spares: Valve swivel plate seal set and packing gland maintenance kit. Actuator cover spanner tool Part No. 639175 (for size 50 (D)) and gland sleeve tool Part No. 639166 (spindle ∅ 8 mm, D = 6 mm). Recommended thread grease: Klüberpaste UH1 96-402.