Burkert 20100064 (Type 2101) is a pneumatically operated 2/2-way globe valve configured for on/off isolation of liquid and gaseous media. Built with a cast stainless steel body (316L) and a polyphenylene sulphide (PPS) piston actuator, this specific unit provides a nominal orifice diameter of DN 25 (25 mm seat diameter) and welded pipe ends conforming to ISO 4200, DIN 11866 Series B, and DIN EN ISO 1127 (outer diameter 33.7 mm, inner diameter 29.7 mm, wall thickness 2.0 mm). Operating under control function A (normally closed by spring force), the valve shuts off tight against media flow introduced below the seat, delivering a flow factor Kv of 13 m³/h and an operating pressure range of 0 to 25 bar (PN 25 / Class 150).

Engineered for high hygienic and industrial standards, this execution is CIP and SIP capable, supports steam sterilization, and is cleaned oil- and grease-free for oxygen service according to standard DIS 1000020797. The spindle is sealed via self-adjusting PTFE V-rings with spring compensation, and the valve disc incorporates a stainless steel swivel plate with a PTFE seat seal to maintain high seat tightness without sticking.

Structure and Operating Principle

Type 2101 comprises a pneumatic piston actuator mounted directly onto a 2-way globe valve body. The mechanical link between actuator piston and closing element is established through a stainless steel spindle guided in PEEK bushings. Spring force (control function A) acts downward through the spindle to press the swivel plate against the screwed-in valve seat.

In this configuration, process media flows below the seat. Medium pressure acts on the underside of the swivel plate, assisting the opening motion when compressed air is supplied to pilot port 1. When the pilot chamber is vented, heavy-duty internal springs drive the swivel plate closed against the medium stream, eliminating water hammer risks typical of flow-above-seat configurations on liquid lines.

Definition of DN

In Burkert Type 2101 documentation, DN designates the nominal diameter of the internal orifice seat (25 mm for article 20100064), rather than the pipeline connection size.

Technical Data and Operating Parameters

Specification Parameter	Value / Material
Valve Type	Type 2101 2/2-way globe valve
Burkert Article Number	20100064
Control Function	CFA (Normally closed in rest position by spring force)
Flow Direction	Below seat (closing against medium flow)
Nominal Diameter (DN)	DN 25 (Seat ø 25 mm)
Kv Value (Water)	13 m³/h
Body Material	Stainless steel 316L
Actuator Housing Material	Polyphenylene sulphide (PPS)
Spindle Material	1.4401 / 1.4404 stainless steel
Spindle Guide	PEEK (for sizes up to DN 65)
Swivel Plate Material	Stainless steel with PTFE seal insert
Packing Gland Seals	Self-adjusting PTFE V-rings with spring compensation
Process Connection	Weld end: ISO 4200 / DIN 11866 B / DIN EN ISO 1127
Weld Dimensions	Outer ø 33.7 mm, Inner ø 29.7 mm, Wall thickness 2.0 mm
Operating Pressure Range	0.00 bar to 25.00 bar (PN 25 / Class 150)
Pilot Pressure Range	5.0 bar to 10.0 bar
Medium Temperature Range	-10 °C to +60 °C (device specific per datasheet)
Ambient Temperature Range	-10 °C to +60 °C
Enclosure Rating	IP67 per IEC 529 / EN 60529
Oxygen Cleanliness	Yes, oil- and grease-free per DIS 1000020797

Pressure Derating by Operating Temperature

Operating pressure limits must be derated according to the applicable piping standard when process temperatures exceed room ambient:

Temperature Range	PN 25 (DIN EN 12516-1)	Class 150 (ASME B16.5 / B16.34)	JIS B 2220 10K
-10 °C to +38/+50 °C	25.0 bar	19.0 bar	14.0 bar
+100 °C	24.5 bar	16.2 bar	14.0 bar
+150 °C	22.4 bar	14.8 bar	13.4 bar
+200 °C	20.3 bar	13.7 bar	12.4 bar
+230 °C	19.0 bar	12.7 bar	11.7 bar

Pressure Equipment Directive Limits

According to the Pressure Equipment Directive (PED), specific pressure limitations apply for compressible fluids of Group 1 (hazardous gases and vapors): DN65 is capped at 15 bar, DN80 at 12.5 bar, and DN100 at 10 bar.

Installation and Assembly

The valve can be installed in any orientation, though an upright actuator orientation is recommended for optimal drainability and seal longevity. Before fitting, piping lines must be flushed clean of welding residue, scale, and foreign matter.

Actuator Disassembly for Welding

When welding the valve body into the pipeline, the actuator and any attached control unit must be detached from the stainless steel body to protect polymer housings and elastomer/PTFE seals from heat damage.

1. Clamp the valve body in an appropriate holding collet or fixture.
2. For control function A, supply pilot air port 1 with compressed air at 5 bar to lift the swivel plate into the fully open position.
3. Apply a properly sized open-end wrench to the body connection hexagon (do not use pipe wrenches).
4. Unscrew and lift the actuator mechanism clear of the valve body.
5. Weld the valve body into the pipe system following standard orbital or TIG procedures.
6. After cooling, inspect the body seal (replace if compromised), grease body connection threads using Klüberpaste UH1 96-402, reopen the actuator with 5 bar pilot pressure, and screw the actuator into the body.

Connection Size (DN)	Body Tightening Torque
DN 15	45 ± 3 Nm
DN 20	50 ± 3 Nm
DN 25 (Article 20100064)	60 ± 3 Nm
DN 32 / DN 40	65 ± 3 Nm
DN 50	70 ± 3 Nm
DN 65	100 ± 3 Nm
DN 80	120 ± 5 Nm
DN 100	150 ± 5 Nm

Spring Tension Hazard

The actuator housing contains a preloaded internal spring under mechanical tension. Never attempt to disassemble or pry open the actuator housing; violent release of the internal spring can cause severe physical trauma.

Lubricant Compatibility

Article 20100064 is prepared for oxygen applications. In oxygen or purity-critical systems, only use certified lubricants compatible with oxygen. Inappropriate greases present acute combustion or explosion risks.

Actuator Port Alignment

The actuator body can be steplessly rotated 360° to orient pneumatic supply lines away from structural interferences. Pressurize pilot port 1 with 5 bar air (keeping the valve open), engage the body connection hexagon with an open-end wrench, and rotate the actuator counterclockwise (viewed from below) to the target orientation.

Pneumatic Connection and Relief Bore Monitoring

Pneumatic pilot air is connected to port 1 using standard 6/4 mm or 1/4" hose connections. On single-acting CFA valves, venting occurs through port 2, where an unattached silencer is supplied to minimize acoustic noise. In corrosive ambient environments, exhaust port 2 can be ducted away to prevent atmospheric contaminants from entering the actuator chamber.

The intermediate valve tube features an external relief bore located between the actuator seal and the spindle packing. This bore provides immediate visual indication of packing gland wear or seat bypass.

Relief Bore Sensor Option

Under option code NA99, an adapter can be threaded into the relief bore (M4x0.35 thread adapted to M5x0.8) to connect automated leakage detectors. Do not attach closed vessels or allow back pressure to develop in this port, as escaping media forced into the actuator can cause total device failure.

Maintenance, Servicing, and Spare Parts

Under regular operational parameters, the Type 2101 actuator is maintenance-free. Visual inspections should regularly confirm body joint tightness and check the relief bore for fluid weeping.

Replacing Valve Set and Seat

When seat bypass occurs due to particulate damage or cycle wear, the swivel plate and screwed-in seat ring can be replaced independently.

1. De-energize and de-pressurize piping; drain media completely.
2. Open the valve with 5 bar pilot pressure on port 1 and unscrew the actuator from the valve body.
3. Support the swivel plate on a cylindrical prism and knock out the retaining pin using a ø 3 mm pin punch (for 10 mm spindle diameter).
4. Mount the new swivel plate, align pin boreholes, insert the new pin, and caulk both borehole openings using a center punch.
5. If the body seat requires replacement, use the dedicated assembly key (order no. 652 606) to unscrew the damaged seat, clean body threads, apply approved lubricant, and torque the replacement seat to 40 ± 5 Nm.

Valve Seat Orifice	Seat Assembly Torque
DN 15	20 ± 3 Nm
DN 20	28 ± 3 Nm
DN 25 (Article 20100064)	40 ± 5 Nm
DN 32	65 ± 5 Nm
DN 40	85 ± 8 Nm
DN 50	120 ± 8 Nm
DN 65	150 + 10 Nm
DN 80	180 + 10 Nm
DN 100	220 + 10 Nm

Factory Spare Part Kits for DN 25

Spare Part Kit Designation	Included Components	Order Number
Valve Set DN 25 (PTFE)	Swivel plate with PTFE seal, retaining pin, body seal	160 737
Valve Seat Set DN 25	Coated valve seat ring, O-ring, body seal	262 170
Packing Gland Seal Set (10 mm spindle)	Support ring, 7 chevron V-rings, thrust collars, spring, guide, lubricant	216 433
Seat Assembly Key DN 25	Tool insert for seat extraction and torquing	652 606
Modified Socket Wrench (10 mm spindle)	Socket wrench AF 19 for packing gland spindle guide	683 221

Troubleshooting

Symptom	Root Cause	Corrective Action
Actuator fails to switch	Pilot air connected to wrong port	For CFA, verify pilot pressure is applied strictly to port 1.
	Pilot pressure below minimum limit	Verify pilot pressure is at least 5.0 bar (max 10 bar).
	Operating medium pressure too high	Compare line pressure against type label limits (max 25 bar).
Valve leaks across the seat	Foreign particulate trapped in seat	Disassemble and install upstream dirt trap (DIN EN 161 strainer).
	PTFE seat seal worn or deformed	Install replacement valve set (order no. 160 737).
Medium leaking from relief bore	Spindle packing gland worn	Replace packing gland seal kit (order no. 216 433) using tool 683 221.

Hazardous Area Operation (PX51 Mechanical Ex Equipment)

For versions operating under ATEX/IECEx mechanical certification EPS 18 ATEX 2 008 X / IECEx EPS 18.0007 X (Ex h IIC T4...T2 Gb / Ex h IIIC T135 °C...T300 °C Db), equipotential bonding is mandatory. Connect the stainless steel valve body to the pipe grounding system and ground conductive actuator components via dedicated grounding strap clamps. Wipe exterior surfaces with damp or antistatic cloths only to avoid electrostatic discharge hazards.