The Burkert 20085271 (Type 2100) pneumatically operated 2/2-way angle seat valve ELEMENT is specially optimized for decentralized process automation and fulfills tough criteria in process environments. Its unique design allows easy integration of automation units in all expansion stages, from electrical/optical position feedback to pneumatic control and integrated fieldbus interfaces. Maximum service life and tightness are achieved by the proven self-adjusting V-seal packing gland. The highly integrated system of valve and automation unit is characterized by its compact and smooth design, integrated pilot air ducts, protection classes IP65/67, NEMA Type 4X, and high resistance to chemicals.

Key features include high flow rates, long service life, a flow-optimized stainless steel valve body, and suitability for steam and other demanding media.

Product Overview

Item	Description	Item	Description
1	Transparent cap with position	2	Actuator cover
3	Actuator housing	4	Relief bore
5	Valve body	6	Flow direction marking
7	Port connection	8	Body connection
9	Actuator connection	10	Pilot air port 1
11	Pilot air port 2

Technical Data

General Properties

Property	Value
Design	Angle seat valve
Nominal diameter	DN 10...DN 80, NPS 3/8...NPS 3 (Model 20085271 is DN 32)
Safety setting	Normally closed (control function A), normally open (control function B)
Flow direction	Flow to open (below seat), flow to close (above seat)

Performance Data

Property	Value
Operating pressure	0 bar(g)...25 bar(g), vacuum variants down to -0.9 bar(g)
Nominal pressure	PN 25 (DIN EN 1333), Class 150 (DIN EN 1759)
Pilot pressure	2.5 bar(g)...10 bar(g)
Seat leakage	Leakage rate A (DIN EN 12266-1), seat seal PTFE and PEEK, test medium air

Medium Data

Property	Value
Operating medium	Steam, water, neutral gases, alcohols, oils, fuels, hydraulic fluids, salt solutions, alkalis, organic solvents, oxygen and fuel gases
Medium temperature	-40 °C...+230 °C (Model 20085271: -10 °C to +185 °C)
Viscosity	Max. 600 mm²/s
Control medium	Air, neutral gases

Control Functions and Flow Direction

Flow Direction Below the Seat

Only use flow direction below the seat for liquid media, gases, and vapors. As the medium is present under the swivel plate, the operating pressure contributes to the opening of the valve.

Flow Direction Above the Seat

Only use flow direction above the seat for gases and vapors, and for valves with control function A (closed by spring force in rest position). As the medium is present above the swivel plate, the operating pressure contributes to the closing of the valve and supports the sealing of the valve seat.

WARNING

Risk of damage due to bursting pipes and bursting equipment when the flow is above the seat. In the case of liquid mediums, water hammer can occur causing pipes and the device to burst. Do not use valves with flow above the seat for liquid mediums.

Materials

No.	Element	Material
1	Ground terminal	Stainless steel 1.4301/1.4305 (only for ATEX variant)
2	Optical position indicator	Polysulfone PSU
3	Pilot air ports	Push-in connector PP (Standard)
4	Actuator cover	PPS
5	Actuator casing	Stainless steel 1.4561 (316Ti)
6	Piston seal	FKM
7	Spring	Stainless steel 1.4310
8	Pipe	Stainless steel 1.4401 (316)/1.4404 (316L)
9	Packing gland	PTFE V-Rings (filled), with spring compensation
10	Spindle	Stainless steel 1.4401 (316)/1.4404 (316L)
11	Spindle guide	PEEK
12	Body seal	Graphite, PTFE (Option)
13	Swivel plate	Stainless steel 1.4401 (316)/1.4404 (316L)
14	Seat seal	PTFE, PEEK (Option)
15	Valve body	Stainless steel CF3M

Note

The lubricants for the packing gland and actuator are classified according to NSF H1.

Dimensions

Actuator Dimensions

Nominal diameter DN	NPS	Actuator size ∅	∅ A [mm]	B [mm]	H [mm]	K/M [mm]
15	1/2	50 (D)	64.5	166	163	147
20	3/4	50 (D)	64.5	174	171	155
25	1	70 (M)	91	191	188	165
32	1 1/4	70 (M)	91	201	197	174
32	1 1/4	90 (N)	120	243	242	217
40	1 1/2	90 (N)	120	246	245	220
50	2	90 (N)	120	262	261	236

Body with Threaded Connection

DN	NPS	G (DIN ISO 228-1)	NPT (ASME B1.20.1)	RC (ISO 7-1)	CM	LM	AF
15	1/2	14	13.7	13.2	24	65	27
20	3/4	16	14.0	14.5	27	75	34
25	1	18	16.8	16.8	29.5	90	41
32	1 1/4	16	17.3	19.1	36	110	50
40	1 1/2	18	17.3	19.1	35	120	55
50	2	24	17.6	23.4	45	150	70

Operating Limits

Application Limits for Ambient and Medium Temperature

Pilot air port	Medium temperature for PTFE and PEEK seal [°C]	Ambient temperature [°C]
Push-in connector	-10...+230	-10...+60
Threaded bushing	-10...+230	-10...+100

Approvals and Conformities

• Explosion Protection: ATEX II 2G Ex h IIC T4…T2 Gb / II 2D Ex h IIIC T135 °C…T300 °C Db; IECEx EPS 18.0007X.
• Drinking Water: Suitable for use in drinking water applications (TrinkwasserV).
• Foods and Beverages/Hygiene: FDA, USP, EC Regulation 1935/2004, China food GB Standards.
• Others: DNV GL classification, Suitability for oxygen, Fuel gases (CE).

ATEX / IECEx Safety Instructions

For devices used in potentially explosive atmospheres (Zones 1/21 and 2/22):

• Electrostatic Hazard: Ensure the device is properly grounded to prevent electrostatic discharge. Ground the valve body to the piping system. If using a plastic valve body, ground the actuator separately.
• Cleaning: Only use cleaning agents certified for explosive environments.
• Media Restrictions: For media with conductivity ≤100 pS/m, ensure flow velocity does not exceed 1 m/s or prevent the piping system from running dry.