BURKERT 20014131 (Type 2101) is a pneumatically operated 2/2-way globe valve configured with a DN 25 DIN EN 1092-1 PN 25 flange connection, normally closed control function A, and flow direction below the seat. Built within the modular ELEMENT architecture, this valve is engineered for decentralised process automation, accommodating demanding media such as steam, water, alcohols, fuels, hydraulic fluids, saline solutions, and organic solvents. The assembly combines a precision-cast stainless steel 316L body with a 70 mm diameter polyphenylene sulphide (PPS) actuator, delivering tight shut-off up to 16 bar(g) and a water flow coefficient (Kv) of 13 m³/h.

Sealing integrity relies on a self-adjusting PTFE V-ring packing gland with spring compensation and a pivoting stainless steel swivel plate fitted with a PTFE seat seal. The valve meets DIN EN 12266-1 leakage rate A requirements. The actuator housing provides IP65/IP67 ingress protection, NEMA 4X classification, and chemical washdown resistance. The device complies with Regulation (EC) 1935/2004 for food contact and supports both clean-in-place (CIP) and steam-in-place (SIP) thermal decontamination cycles.

Technical Specifications

Specification Parameter	Value / Range
Product Model / Series	20014131 / Type 2101
Valve Construction	Complete 2/2-way globe valve
Nominal Diameter (Seat & Connection)	DN 25 (NPS 1), Seat Diameter 25 mm
Flange Standard & Pressure Rating	DIN EN 1092-1, PN 25 (Face-to-face FTF 1 per DIN EN 558-1)
Control Function	Control function A (CFA): Normally closed (NC) by spring force
Flow Direction	Against closing direction (below seat)
Operating Pressure Range	0.00 bar(g) to 16.00 bar(g) (derated at elevated temperatures)
Nominal Pressure Class	PN 25 (DIN EN 1333) / Class 150 (DIN EN 1759)
Pilot Pressure Range	4.8 bar(g) to 10.0 bar(g)
Flow Coefficient (Kv water)	13.0 m³/h (measured at +20 °C, 1 bar Δp)
Seat Leakage Class	Leakage rate A per DIN EN 12266-1 (Air test medium)
Medium Temperature Range	-40 °C to +185 °C (standard PTFE seat seal)
Ambient Temperature Range	-10 °C to +100 °C (with push-in pilot air port)
Maximum Medium Viscosity	600 mm²/s
Control Medium	Neutral gases, compressed air
Pilot Air Connection	Push-in connector for hose external Ø 6 mm (G 1/8 available)
Ingress Protection & Rating	IP65 / IP67 according to IEC 529 / EN 60529, NEMA Type 4X
Conformity & Directives	Pressure Equipment Directive 2014/68/EU, Machinery Directive 2006/42/EC
Food Contact Compliance	Regulation (EC) 1935/2004, FDA compliant materials, CIP / SIP capable

Control Functions and Flow Direction

Type 2101 uses a pneumatic piston actuator acting directly on a valve spindle and swivel plate. In control function A, internal spring sets press the swivel plate against the screwed-in valve seat when de-energised. Supplying pilot pressure (minimum 4.8 bar) beneath the actuator piston lifts the spindle to open the flow path.

In model 20014131, flow enters below the seat. Operating pressure acts on the underside of the swivel plate, assisting the opening stroke and preventing pressure spikes.

WATER HAMMER HAZARD ON FLOW-ABOVE-SEAT VARIANTS

Do not use valves configured with flow direction above the seat for liquid mediums. In liquid services, closing with the medium flow induces water hammer, leading to fractured pipework and device destruction. Flow-above-seat configurations are restricted strictly to dry gases and steam.

Materials of Construction

All wetted metallic components are manufactured from stainless steel 316L (CF3M) and 1.4404. Non-metallic seals contacting media are certified virgin PTFE and fluoroelastomers.

Item No.	Component Description	Material Specification
1	Ground Terminal (ATEX variant)	Stainless steel 1.4301 / 1.4305
2	Optical Position Indicator	Polysulfone (PSU)
3	Pilot Air Ports	Polypropylene (PP) push-in standard; G 1/8 stainless steel 1.4305 optional
4	Actuator Cover	Polyphenylene sulphide (PPS)
5	Actuator Casing	Stainless steel 1.4561 (316Ti)
6	Piston Seal	Fluoroelastomer (FKM)
7	Actuator Spring Set	Stainless steel 1.4310
8	Spindle Packing Tube	Stainless steel 1.4401 (316) / 1.4404 (316L)
9	Spindle Packing Gland	Filled PTFE V-rings with Belleville spring compensation
10	Valve Spindle	Stainless steel 1.4401 (316) / 1.4404 (316L)
11	Spindle Guide Bushing	Polyetheretherketone (PEEK) for DN 15–65
12	Body Flange Seal	Graphite (PTFE optional)
13	Swivel Plate	Stainless steel 1.4401 (316) / 1.4404 (316L)
14	Valve Seat Seal	PTFE (Polytetrafluoroethylene)
15	Screwed-in Valve Seat	Stainless steel 1.4571 with EPDM O-ring
16	Valve Body	Cast stainless steel CF3M / forged 316L

All lubricants applied to the actuator piston seal and spindle packing are classified according to NSF H1 for incidental food contact.

Dimensional Data

Model 20014131 features a DN 25 flanged body conforming to DIN EN 1092-1 PN 25, face-to-face dimension FTF 1 (DIN EN 558-1). The Ø 70 mm PPS actuator provides necessary thrust while maintaining a compact vertical profile.

Flange Dimensions (DIN EN 1092-1 PN 25)

Connection DN	Outer Flange Ø DF [mm]	Face-to-Face LF [mm]	Pitch Circle Ø BF [mm]	Flange Thickness AF [mm]	Hole Diameter Ø D [mm]	Bolt Pattern A x α	Raised Face Ø MF [mm]
10	90	130	60	16	14	4 × 90°	13.6
15	95	130	65	16	14	4 × 90°	18.1
20	105	150	75	18	14	4 × 90°	23.7
25 (Model 20014131)	115	160	85	18	14	4 × 90°	29.7
32	140	180	100	18	18	4 × 90°	38.4
40	150	200	110	18	18	4 × 90°	44.3
50	165	230	125	20	18	4 × 90°	56.3

Actuator Dimensions (Ø 70 mm Code M)

• Actuator Outer Diameter (Ø A): 91 mm
• Total Height (H) for DN 25 Body with Actuator: 259 mm
• Total Height with Control Head Type 8691 / 8695: 356 mm
• Total Height with Pneumatic Control Unit Type 8690 / 8697: 323 mm

Operating and Temperature Limits

The maximum permissible working pressure decreases with increasing operating temperature in compliance with DIN EN 12516-1.

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

Medium Temperature [°C]	Permissible Operating Pressure [bar]
-10 °C to +50 °C	25.0 bar
+100 °C	24.5 bar
+150 °C	22.4 bar
+185 °C (Upper limit for PTFE seat)	21.0 bar
+200 °C	20.3 bar
+230 °C (PEEK seat variant only)	19.0 bar

AMBIENT AND MEDIUM TEMPERATURE INTERDEPENDENCE

When operating at a maximum medium temperature of +185 °C, ensure ambient temperature does not exceed +60 °C when using polymer push-in pneumatic fittings, or +100 °C when using metallic threaded pilot connections. When an electrical pilot solenoid is mounted directly on the actuator, ambient temperature is limited to +55 °C.

Installation and Actuator Alignment

Before mounting, ensure pipelines are fully blown down, free of weld spatter, slag, and debris. Cleanliness protects the ground seat sealing face from scoring.

• Position: The valve operates in any orientation, but vertical upright mounting with the actuator facing upwards is recommended.
• Flange Mounting: Tighten bolts crosswise in calibrated torque increments.
• Tightening Torque: For DN 25 body-to-actuator connection, torque to 60 ± 3 Nm.

360° ACTUATOR POSITIONING

The pneumatic actuator can be rotated 360° independently of the valve body to orient pilot air connections and cable glands away from obstructions:

1. Ensure the valve is depressurised.
2. For Control Function A, apply 5 bar compressed air to pilot port 1 so the valve is held fully open.
3. Apply an open-end wrench to the body connection hexagon.
4. Rotate the actuator counter-clockwise (viewed from below) to the desired orientation.
5. Release pilot pressure.

RELIEF BORE LEAKAGE MONITORING

The bonnet tube features an integrated relief bore between the primary spindle packing and actuator wiper seals. An optional adapter kit converts this port to an M4 or M5 thread, allowing users to fit leak detection pressure transmitters or drainage piping. Never seal this port with a closed plug, as backpressure can force process fluid directly into the pneumatic chamber.

Maintenance and Wearing Parts Replacement

Under normal service conditions, the actuator requires no lubrication or internal maintenance. Routine preventative checks include periodic inspection of the relief bore for weeping fluid, which signals early packing gland wear.

Replacement of the Screwed-in Valve Seat

1. Depressurise the fluid line and discharge medium.
2. Apply 5.0 bar pilot air to port 1 to shift the valve into the open position.
3. Unscrew the actuator from the body using an open-end wrench.
4. Engage assembly tool 652 606 into the notched profile of the DN 25 valve seat.
5. Unscrew the worn seat, clean internal body threads, and apply Klüberpaste UH1 96-402.
6. Screw in the replacement seat and tighten to 40 ± 5 Nm using a calibrated torque wrench.
7. Reinstall actuator with a new body seal and tighten body joint to 60 ± 3 Nm.

Packing Gland Seal Replacement

The packing gland seal set contains 1 support ring, 7 chevron V-rings, 2 thrust collars, 1 Belleville compression spring, 1 PEEK spindle guide, and body seals.

• Spindle guide tightening torque (10 mm spindle diameter): 6 Nm.
• Special tool required: Modified socket wrench AF 19 (Article 683 221).

Spare Part Numbers for Model 20014131 (DN 25, Actuator Ø 70 mm)

Description of Spare Part Set	Orifice / Size	Bürkert Order Number
Valve Set (Swivel plate with PTFE seal, pin, body seal)	DN 25	160 737
Seal Set for Packing Gland (Standard PTFE V-rings)	DN 15–50, Actuator Ø 70 mm	216 433
Seal Set for Packing Gland (Hot water variant up to +200 °C)	DN 15–50, Actuator Ø 70 mm	372 661
Seal Set for Packing Gland (High temp variant up to +230 °C)	DN 15–50, Actuator Ø 70 mm	372 662
Valve Seat Set (Seat, O-ring, body seal)	DN 25	262 170
Seat Assembly Tool	DN 25	652 606
Modified Socket Wrench for Spindle Guide	DN 15–50 (Spindle Ø 10 mm, AF 19)	683 221

Automation and Modular Accessories

Model 20014131 integrates directly with Burkert ELEMENT control tops without external pipework, routing pneumatic pilot air through internal channels:

• Type 8691 Control Head: Non-contact inductive position sensor with bright colored diagnostic LEDs, integrated pilot valve with manual override, teach function for stroke limits, and AS-Interface or IO-Link communications.
• Type 8690 Pneumatic Control Unit: Integrated mechanical or inductive limit switches for discrete position feedback.
• Combining model 20014131 with Type 8691 forms the factory-assembled valve system on/off ELEMENT Type 8801-GC.