BURKERT 20026190 (Type 2100) is a pneumatically operated 2/2-way angle seat valve designed for decentralized process automation. Built with an investment cast stainless steel CF3M valve body and a PPS/stainless steel 1.4561 piston actuator, this configuration incorporates DN50 (NPS 2") ASME BPE clamp process connections, a 50 mm seat orifice diameter, an installation length of 230 mm, and a water flow coefficient Kv of 49 m³/h. The valve utilizes Control Function A (normally closed, closed by spring force in the unpressurized rest position) and is set up with flow direction above the seat (flow-to-close) for shutting off compressible media including steam, neutral gases, and industrial vapours.

Operating capabilities span vacuum conditions down to -0.9 bar(g) and positive operating pressures up to 12.0 bar(g), within a fluid temperature span of -10 °C to +185 °C. The valve assembly complies with EC Regulation 1935/2004 and FDA food contact regulations, ships with an EN 10204 3.1 inspection certificate, and is fully CIP/SIP capable. Pilot control is routed through an external 6 mm (1/4") push-in pneumatic connector, requiring a control pressure between 2.7 bar(g) and 7.0 bar(g) into the Ø 70 mm (Size M) actuator.

Operational Safety Restriction: Flow Above Seat Prohibited for Liquids

Risk of severe personal injury and equipment rupture caused by water hammer when fluid flows above the seat. In liquid service, sudden valve closure induces hydraulic pressure shockwaves that can burst pipes and the valve body. Bürkert Type 2100 valves configured with flow direction above the seat must never be used with liquid media. Use this valve only with steam, neutral gases, and gaseous media.

Operating Pressure and Pilot Limits

Operating pressure must not exceed 12.0 bar(g) for the DN50 seat with Ø 70 mm actuator in flow-above-seat configuration. Pilot pressure must be set within 2.7 to 7.0 bar(g). Operating outside the specified medium temperature range of -10 °C to +185 °C or ambient temperature range of -10 °C to +60 °C (governed by the push-in pneumatic fitting) will degrade seals and compromise valve performance.

Principle of Operation and Flow Direction Above Seat

Burkert 20026190 functions as a single-acting on/off valve. In the rest position without pilot air, the internal stainless steel 1.4310 spring pack exerts continuous closing force through the spindle to push the swivel plate onto the valve seat. Because the process fluid enters above the swivel plate, line pressure actively assists the spring in pressing the PTFE seal firmly against the seat orifice. This flow-to-close design enhances seat tightness (Leakage rate A in accordance with DIN EN 12266-1) against compressible steam and gases.

Opening the valve requires supplying compressed air to pilot air port 1. When pilot pressure exceeds the counteracting spring force and process line pressure, the actuator piston travels upward, lifting the swivel plate away from the seat. Evacuating pilot air port 1 vents the lower piston chamber, allowing the spring force and medium pressure to return the valve to the closed position.

Position	Component Name	Function / Description
1	Transparent cap	Visual position indicator display housing
2	Actuator cover	Polyphenylene sulphide (PPS) top casing
3	Actuator housing	Stainless steel 1.4561 (316Ti) cylinder
4	Relief bore	Atmospheric leakage monitoring port for packing gland
5	Valve body	Stainless steel CF3M investment cast angle seat body
6	Flow direction marking	Directional arrow cast into the body wall
7	Port connection	ASME BPE hygienic clamp connection
8	Body connection	Hexagonal interface connecting body and bonnet
9	Actuator connection	Hexagonal drive connection nut
10	Pilot air port 1	Pneumatic control air inlet (valve opening chamber)
11	Pilot air port 2	Exhaust / spring chamber vent (fitted with silencer)

Materials of Construction

Long-term spindle sealing is maintained by a self-adjusting PTFE V-ring packing gland loaded by spring compensation. Spindle guidance is provided by a virgin PEEK bush to prevent galling under high-cycle industrial actuation. All wetted components meet sanitary design guidelines, and lubricants applied to the packing gland and actuator internals are certified NSF H1.

Item	Component	Material
1	Ground terminal	Stainless steel 1.4301 / 1.4305 (supplied with ATEX variants)
2	Optical position indicator	Polysulfone (PSU)
3	Pilot air ports	Polypropylene (PP) push-in fitting (external Ø 6 mm / 1/4")
4	Actuator cover	Polyphenylene sulphide (PPS)
5	Actuator casing	Stainless steel 1.4561 (316Ti)
6	Piston seal	Fluoroelastomer (FKM)
7	Spring	Stainless steel 1.4310
8	Pipe	Stainless steel 1.4401 (316) / 1.4404 (316L)
9	Packing gland	Filled PTFE V-rings with spring compensation
10	Spindle	Stainless steel 1.4401 (316) / 1.4404 (316L)
11	Spindle guide	Polyether ether ketone (PEEK)
12	Body seal	Graphite (standard) / PTFE (option)
13	Swivel plate	Stainless steel 1.4401 (316) / 1.4404 (316L)
14	Seat seal	Polytetrafluoroethylene (PTFE)
15	Valve body	Stainless steel CF3M (cast 316L equivalent)

Operating Conditions and Pressure-Temperature Ratings

Maximum working pressure for article 20026190 is 12.0 bar(g). The structural valve body pressure integrity corresponds to PN 25 per DIN EN 1333 and Class 150 per DIN EN 1759 / ASME B16.34. Permissible operating pressure derates at elevated process temperatures according to pressure vessel directives.

Pressure Derating per DIN EN 12516-1 (PN 25)

Medium Temperature [°C]	Maximum Permissible Operating Pressure [bar(g)]
-10 to +50	25.0
+100	24.5
+150	22.4
+200	20.3
+230	19.0

Pressure Derating per ASME B16.34 Class 150

Medium Temperature [°C]	Maximum Permissible Operating Pressure [bar(g)]
-29 to +38	19.0
+50	18.4
+100	16.2
+150	14.8
+200	13.7
+230	12.7

Vacuum Variant Specification

Article 20026190 is constructed without an external atmospheric relief bore on the packing gland zone. This sealed execution enables leak-tight process operation under vacuum conditions down to -0.9 bar(g) without ingress of ambient air.

Process Connection and Dimensional Data

The valve body has hygienic clamp ends certified to ASME BPE (DIN 11866 Series C pipe dimensions). Clamp connections provide tool-free sanitary installation using tri-clamp gaskets and clamp bands.

Body Dimensions for ASME BPE Clamp (DIN 11866 Series C Pipe)

Nominal Port Size (NPS)	Nominal Diameter (DN)	Face-to-Face Length LC [mm]	Centerline Height CC [mm]	Clamp Flange Outer Ø D1 C [mm]	Pipe Outer Ø D2 C [mm]	Pipe Wall Thickness SC [mm]
1/2"	DN 15	130	49.0	25.0	12.70	1.65
3/4"	DN 20	150	56.5	25.0	19.05	1.65
1"	DN 25	160	58.0	50.5	25.40	1.65
1 1/2"	DN 40	200	69.0	50.5	38.10	1.65
2" (Article 20026190)	DN 50	230	77.5	64.0	50.80	1.65

Actuator Dimensions for Type 2100 on DN50 Body

Actuator Size	Actuator Outer Ø A [mm]	Dimension B [mm]	Dimension H [mm]	Dimension K/M [mm]
70 mm (Size M) - 20026190	91	223	219	196
90 mm (Size N)	120	262	261	236
130 mm (Size P)	159	312	312	273

Note: Dimensions B, H, K, and M represent maximum dimensions and may be up to 6 mm less depending on process connection orifice size and manufacturing tolerances.

Overall Height with Mounted ELEMENT Automation Modules

Actuator Size	Body Size	Overall Height B/H with Type 8690 / Type 8697 [mm]	Overall Height B/H with Type 8691 / Type 8695 [mm]
70 mm (Size M) - 20026190	DN 50	274	297
90 mm (Size N)	DN 50	313	337
130 mm (Size P)	DN 50	351	374

Pneumatic Connection and Actuator Positioning

Pilot air supply lines connect to the actuator via integrated push-in fittings accommodating 6 mm (or 1/4") outer diameter flexible pneumatic tubing. Port 1 is the control air inlet for opening the valve. Port 2 vents the spring chamber during opening strokes and is supplied with a screw-in porous bronze silencer to reduce exhaust air discharge noise below 70 dB(A). In corrosive industrial environments, Port 2 should be piped into a clean neutral atmosphere.

The actuator body rotates through 360° to adjust pneumatic ports toward incoming air tubing or automation cabling.

Mandatory Actuator Rotation Procedure

When rotating the actuator to adjust pilot air port alignment, apply open-end wrenches simultaneously to the actuator drive hexagon nut and the body connection hexagon nut. Rotate the actuator only in the direction shown on the actuator casting arrow. Rotating in the opposite direction can unscrew the body connection, resulting in medium leakage and seal destruction during process pressurization.

Decentralized Automation Combinations

Burkert Type 2100 forms part of the modular ELEMENT valve architecture. The actuator interface permits direct coupling of automation heads without external air tubing:

• Type 8690: Compact pneumatic control unit with mechanical or inductive position limit switches for actuator size Ø 70 mm.
• Type 8691: Microprocessor-controlled control head featuring non-contact inductive position sensing, automatic teach-in end position adjustment, and integrated high-luminosity colored status LEDs.
• Type 8695: Compact sanitary control head with integrated pilot solenoid valve and IO-Link / AS-Interface / büS communication interfaces.
• Type 8697: Pneumatic control unit with integrated pilot valve, designed for explosive atmosphere installations.
• Type 8801-YE: Complete automated on/off valve assembly combining Type 2100 with Type 8690 or Type 8691 control modules.

Installation, Assembly, and Maintenance Procedures

Ensure process pipework is aligned axially and cleared of debris prior to clamping the valve body. Clamp connection ferrule gaskets must be positioned squarely to avoid turbulent flow disturbances.

Body Connection Tightening Torques

Nominal Diameter (DN)	Applicable Actuator Sizes	Tightening Torque [Nm]	Tolerance [Nm]
DN 15	40 (C), 50 (D), 63 (E)	45	+10 / -5
DN 20	40 (C), 50 (D), 63 (E), 80 (F)	50	+10 / -5
DN 25	50 (D), 63 (E), 80 (F)	60	+10 / -5
DN 32	63 (E), 80 (F), 100 (G)	65	+10 / -5
DN 40	63 (E), 80 (F), 100 (G), 125 (H)	65	+10 / -5
DN 50 (Article 20026190)	63 (E), 70 (M), 80 (F), 90 (N), 100 (G), 125 (H)	70	+10 / -5
DN 65	80 (F), 100 (G), 125 (H)	70	+10 / -5
DN 65	175 (K), 225 (L)	100	+10 / -5
DN 80	125 (H), 130 (P)	120	+10 / -5
DN 100	125 (H), 175 (K), 225 (L)	150	+10 / -5

Actuator Removal and Reassembly Instruction

When unscrewing or reinstalling the actuator onto the stainless steel valve body, the valve must be in the fully open position. For Control Function A, apply 5.0 bar(g) compressed air to pilot air port 1 to retract the swivel plate. Removing or screwing down the actuator while the seat seal is resting against the body seat causes rotational friction that destroys the PTFE seal ring.

Leakage Inspection and Maintenance Points

Perform periodic visual inspections on the three primary sealing zones illustrated below.

Inspection Point	Observed Fault	Remedial Action
1: Media connectors	Flange leakage at ASME BPE clamp ferrule	Replace clamp gasket and re-tighten clamp band
2: Relief bore / packing zone	Fluid weeping from spindle gland area	Replace packing gland seal kit or actuator subassembly
3: Swivel plate seat	Internal cross-seat leakage in closed position	Replace swivel plate assembly with fresh PTFE seal

Troubleshooting Guide

Symptom	Probable Cause	Corrective Measure
Actuator fails to switch	Control air connected to incorrect port	Connect pilot supply line to Pilot Port 1 (CFA)
	Pilot air pressure below 2.7 bar(g)	Increase control pressure to specified 2.7–7.0 bar(g)
	Operating line pressure exceeds 12.0 bar(g)	Reduce upstream system pressure within allowable limit
	Medium flow reversed	Verify flow enters above seat per directional body arrow
Internal seat leakage	Debris trapped between PTFE seal and seat	Flush pipeline; install upstream particulate strainer
	Worn or gouged PTFE seat seal ring	Install replacement swivel plate kit (Art. No. on inquiry)
	Operating pressure exceeds actuator spring rating	Adjust line pressure or pilot control parameters
External leakage at relief bore	Spindle packing gland V-rings worn	Replace PTFE packing gland using socket wrench Art. 683221
Actuator loose on valve body	Thermal cycling or vibration loosened threads	Re-torque body connection nut to 70 Nm (+10/-5 Nm)