BURKERT 20032698 (Type 2100) is a pneumatically operated 2/2-way angle seat valve of the ELEMENT series configured for decentralized process automation. This execution is supplied with control function B (normally open by spring force), port connection DN 40 (NPS 1 1/2") with weld ends compliant with ASME BPE and DIN 11866 Series C, a precision-cast CF3M stainless steel valve body, and a PTFE seat seal. The valve is engineered for operating pressures from 0.00 bar(g) up to 25.00 bar(g) and fluid temperatures ranging from -10.00 °C to +185.00 °C. It supports full CIP and SIP cleaning routines.

The angle seat construction combines high flow coefficients with a self-adjusting v-ring spindle packing gland. Integrated pilot air routing and seamless interfaces allow direct assembly of automation heads and position feedback modules without external tube loops, retaining enclosure protection to IP65/IP67 and NEMA 4X.

Technical Specifications

Technical Attribute	Specification
Product Type	Type 2100 Angle Seat Valve ELEMENT
Article Number (MPN)	20032698
Circuit Function	2/2-way, normally open (Control Function B)
Flow Direction	Flow to open (under seat)
Port Size DN / NPS	DN 40 / NPS 1 1/2"
Pipe Interface Standard	ASME BPE / DIN 11866 Series C
Pipe Dimensions	Outer Ø 38.1 mm (1.50"), Inner Ø 34.8 mm, Wall 1.65 mm (0.065")
Operating Pressure Range	0.00 bar(g)...25.00 bar(g)
Fluidic Nominal Pressure	PN 25 (DIN EN 1333), Class 150 (DIN EN 1759)
Pilot Pressure Range	2.5 bar(g)...10.0 bar(g) (dependent on operating pressure)
Fluid Temperature Range	-10.00 °C...+185.00 °C
Ambient Temperature Range	-10 °C...+60 °C (push-in) / -10 °C...+100 °C (threaded bushing)
Permissible Fluid Viscosity	Max. 600 mm²/s
Seat Leakage Rate	Leakage rate A (DIN EN 12266-1), air test medium
Operating Media	Water, steam, alcohols, neutral gases, oils, fuels, hydraulic fluids, alkalis, saline solutions, organic solvents
Control Medium	Clean dry compressed air, neutral gases
Pneumatic Port Connection	Push-in connector for Ø 6 mm or 1/4" external diameter hose
Protection Class	IP65 / IP67, NEMA Type 4X

Materials of Construction

Item	Component	Material
1	Ground terminal	Stainless steel 1.4301 / 1.4305 (ATEX variants)
2	Optical position indicator	Polysulfone (PSU)
3	Pilot air ports	Polypropylene PP push-in connector (G 1/8" stainless steel 1.4305 optional)
4	Actuator cover	Polyphenylene sulfide (PPS)
5	Actuator casing	Stainless steel 1.4561 (316Ti)
6	Piston seal	Fluoroelastomer (FKM)
7	Return spring	Stainless steel 1.4310
8	Tube / Actuator stem guide	Stainless steel 1.4401 (316) / 1.4404 (316L)
9	Spindle packing gland	PTFE V-rings (filled), spring-compensated
10	Spindle	Stainless steel 1.4401 (316) / 1.4404 (316L)
11	Spindle guide	Polyetheretherketone (PEEK)
12	Body seal	Graphite (PTFE optional)
13	Swivel plate	Stainless steel 1.4401 (316) / 1.4404 (316L)
14	Seat seal	Polytetrafluoroethylene (PTFE)
15	Valve body	Stainless steel CF3M

Lubricant Compliance

Lubricants applied to the spindle packing gland and actuator mechanism meet NSF H1 registration standards for incidental food contact.

Dimensions and Welded End Geometry

Dimensions for welded bodies according to ASME BPE / DIN 11866 Series C:

Port Connection NPS	Seat Size DN	ES [mm]	CS [mm]	LS [mm]	Outer Ø DS [mm]	Wall Thickness WS [mm]
1/2"	15	30	46	135	12.7	1.65
3/4"	20	30	52	145	19.05	1.65
1"	25	30	51	152	25.4	1.65
1 1/2" (DN40)	40	30	60	182	38.1	1.65
2"	50	30	64	210	50.8	1.65
2 1/2"	65	26	56	230	63.5	1.65
3"	80	26	88.5	266	76.2	1.65

For DN40 with Actuator Size 70 (M):

• Actuator envelope diameter (Ø A): 91 mm
• Dimension B (valve centerline to top of visual indicator): 204 mm max
• Dimension H: 201 mm max
• Centerline to body connection (K/M): 178 mm max

Control Function and Operating Principle

BURKERT Type 2100 with Control Function B is normally open in the de-energized rest state. The actuator internal springs push the spindle and seal disk upward away from the valve seat. Operating medium entering below the seat assists opening.

To close the valve, pilot pressure is applied to pilot air port 1 on top of the actuator piston, overcoming spring force and fluid pressure to seal against the orifice. When pilot air is vented, spring force immediately returns the valve to its open state.

Operating Safety: Flow Direction

Valves specified with flow direction below the seat (flow to open) prevent water hammer in liquid applications. Do not reverse flow over the seat when conveying liquid media; liquid pressure surges above the seat can cause rupture of piping and valve equipment.

Operating Limits and Pressure Derating

Operating pressure ratings are bounded by the nominal pressure curve according to DIN EN 12516-1 (PN25) and ASME B16.34 (Class 150):

Temperature [°C]	DIN EN 12516-1 / PN25 [bar]	ASME B16.34 / Class 150 [bar]	JIS B 2220 10K [bar]
-10...+38	25.0	19.0	14.0
+50	25.0	18.4	14.0
+100	24.5	16.2	14.0
+150	22.4	14.8	13.4
+185	21.0	14.1	12.8
+200	20.3	13.7	12.4
+230	19.0	12.7	11.7

Installation and Actuator Alignment

Prior to welding the valve body into the process line, the actuator assembly must be separated from the body to protect the internal seals from excessive heat.

Welding Disassembly

Because 20032698 is configured as Control Function B, the valve is held open by spring force in its unpressurized state. The actuator can be unscrewed directly from the body connection using an open-end wrench across the body interface flats without applying pilot pressure.

1. Secure the valve body in an appropriate holding fixture.
2. Apply an open-end wrench to the body connection wrench flat and unscrew the actuator assembly.
3. Weld the valve body into the pipeline adhering to hygienic welding procedures.
4. Prior to reassembly, inspect the body seal and lubricate the connection threads (e.g., Klüber paste UH1 96-402).
5. Screw the actuator back into the body. Tighten to the specified torque:

Valve Size DN	Compatible Actuator Sizes	Body Connection 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	70 (M), 90 (N), 130 (P)	65	+10 / -5
DN 50	70 (M), 90 (N), 130 (P)	70	+10 / -5
DN 65	90 (N), 130 (P)	70	+10 / -5
DN 80	130 (P)	120	+10 / -5

Actuator 360° Orientation

The pneumatic ports can be rotated 360° to facilitate pipe routing. Hold the body hexagon flat stationary with an open-end wrench while turning the actuator hex nut clockwise as viewed in the technical diagram. Turning in the wrong direction may loosen the body connection.

Commissioning, Maintenance, and Troubleshooting

During routine service, inspect the following critical points for external leakage:

• Media connection joints (1)
• Spindle relief bore (2)
• Valve seat closure integrity (3)

Troubleshooting Guide

Fault Condition	Probable Cause	Corrective Action
Actuator fails to close	Pilot air connected to incorrect port	Connect pilot pressure to port 1.
	Pilot pressure insufficient	Verify minimum pilot air requirement on the device diagram.
	Operating fluid pressure too high	Check line pressure against valve maximum rating.
	Reverse flow orientation	Confirm medium flows into port 1 and below seat as marked.
Seat leakage in closed position	Pilot pressure too low	Increase pilot control pressure within rated envelope.
	Debris caught between seat and disk	Flush line and install an upstream strainer.
	Worn PTFE seat seal	Replace the swivel plate and seat assembly.
Medium leaking from relief bore	Spindle packing gland worn	Replace the PTFE packing gland kit using tool 683221.

Compatible Automation Modules

Type 2100 integrates directly with Bürkert ELEMENT decentralized control heads and position indicators without external piping:

• Type 8691: Control head with non-contact inductive position sensor and high-brightness optical status display for actuator Ø 70 mm.
• Type 8690: Pneumatic control unit with mechanical or inductive feedback switches and integrated pilot solenoid valve.
• Type 8695 / 8697: Compact control heads and position indicators designed for smaller actuator sizes (Ø 50 mm).
• Fieldbus Integration: Supports AS-Interface, IO-Link, and Bürkert system bus (büS).