BURKERT 20078458 (Type 2100) is a pneumatically operated 2/2-way angle seat valve engineered for decentralized process automation in hygienic and industrial fluid networks. Configured with control function B (normally open), the valve opens via internal spring force in its rest position and shuts off when compressed air is supplied to the pilot port. The process connection conforms to the ASME BPE clamp standard in nominal size DN65 (2 1/2 in), featuring a precision cast CF3M stainless steel body, PTFE seat seal, and a self-adjusting packing gland with spring-compensated PTFE V-rings. Delivering a water flow coefficient Kv of 85 m³/h across an installation face-to-face length of 286 mm, the assembly handles media pressures up to 16 bar and temperatures ranging from -10 °C to +185 °C.

Compatibility with CIP and SIP cleaning regimens, compliance with EC 1935/2004 and FDA food contact standards, and mechanical ATEX / IECEx certification (II 2 G Ex h IIC T4...T2 Gb, II 2 D Ex h IIIC T135°C...T300°C Db) allow deployment in pharmaceutical processing, food and beverage lines, and potentially explosive Zone 1/21 and 2/22 plant environments. The ELEMENT platform architecture integrates pilot air routing directly into the PPS actuator housing and supports the mounting of decentralized automation heads and position indicators.

Technical Specifications

Specification Parameter	Value
Article Number	20078458
Valve Type / Platform	Type 2100 ELEMENT
Construction	2/2-way complete angle seat valve
Control Function	Control function B (CFB), normally open (NO)
Fluidic Ports	2 ports, 2 switching positions
Nominal Diameter (DN)	DN 65 (2 1/2")
Seat Diameter	65 mm
Flow Coefficient Kv (Water)	85 m³/h
Process Connection Type	Hygienic Clamp connection
Pipe Standard / Sizing	ASME BPE (Clamp OD 77.5 mm / 3.047", Tube OD 63.5 mm / 2.5", Tube ID 60.2 mm, Wall 1.65 mm)
Face-to-Face Installation Length	286 mm
Body Material	Cast stainless steel CF3M
Seat Seal Material	PTFE (Polytetrafluoroethylene)
Spindle / Swivel Plate Material	Stainless steel 1.4401 / 1.4404
Spindle Guide Bushing	PEEK
Packing Gland	Self-adjusting PTFE V-rings with spring compensation (lubricated with silicone grease)
Actuator Housing Material	PPS (Polyphenylene sulphide) and stainless steel
Actuator Size	130 (P)
Pilot Air Connection	Push-in connector 6/4 mm (Interface ELEMENT)
Operating Pressure Range	0 to 16 bar (PN 25 / ASME Class 150 derating applies)
Pilot Pressure Range	2.5 to 7.0 bar
Control Medium	Neutral gases, air
Permissible Process Media	Water, alcohol, oils, fuels, hydraulic fluids, saline solutions, lyes, organic solvents, steam, neutral gases
Medium Temperature Range	-10 °C to +185 °C
Ambient Temperature Range	-10 °C to +100 °C (threaded ports) / -10 °C to +60 °C (push-in connector)
Storage Temperature	-20 °C to +65 °C
Enclosure Protection Rating	IP67 (EN/IEC 60529), NEMA 4X
Sound Pressure Level	< 70 dB(A)
Hygienic Compliance	CIP capable, SIP capable, EC 1935/2004, FDA compliant
Explosion Protection	ATEX / IECEx: II 2 G Ex h IIC T4...T2 Gb, II 2 D Ex h IIIC T135°C...T300°C Db

Principle of Operation and Flow Path

BURKERT Type 2100 with control function B utilizes pilot pressure to overcome the actuator spring force and close the valve swivel plate against the valve seat. In the unpressurized rest position, the pre-tensioned actuator springs hold the spindle and swivel plate in the fully open state.

The unit is configured exclusively for flow direction below the seat. Medium enters from under the swivel plate, allowing operating pressure to assist the opening stroke and preventing hydraulic pressure surges (water hammer) in liquid piping lines:

• Closing Stroke: Compressed air at 2.5 to 7.0 bar is admitted to pilot air port 1. The pneumatic piston drives the spindle downward, sealing the PTFE swivel plate against the body orifice.
• Opening Stroke: Venting pilot air port 1 releases pneumatic chamber pressure. Internal spring force pushes the actuator piston and spindle upward into the full 100% stroke open position.

Operating Pressure and Pilot Air Requirement

For control function B with flow direction below the seat, operating pressure opposes the closing force. To ensure shut-off tightness across the valve seat, pilot pressure must be maintained within the specified range (2.5 to 7.0 bar) and verified against actual line operating pressures.

Temperature and Pressure Limits

The operating pressure and permissible ambient temperatures depend on the medium temperature and the type of pneumatic port fittings installed.

Ambient and Medium Temperature Limits

Pilot Air Port Connection	Permissible Medium Temperature (PTFE Seal)	Permissible Ambient Temperature
Push-in connector (6 mm)	-10 °C to +230 °C	-10 °C to +60 °C
Threaded bushing (G 1/4)	-10 °C to +230 °C	-10 °C to +100 °C

Operating Pressure Derating Curves

Temperature	DIN EN 12516-1 / PN25 Pressure Rating	ASME B16.5 / B16.34 Cl. 150 Pressure Rating	JIS B 2220 10K Pressure Rating
-29 °C to +38 °C	-	19.0 bar	-
-10 °C to +50 °C	25.0 bar	18.4 bar (at 50 °C)	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

Application Limits

For article 20078458, the maximum continuous medium temperature is rated at +185 °C with a maximum rated operating pressure of 16 bar. The pressure must not exceed the ASME BPE clamp coupling limits or the derating curves specified in the table above.

Mechanical Installation and Actuator Alignment

The valve can be installed in any orientation, with the actuator pointing vertically upward being preferred. The flow arrow cast onto the CF3M valve body must match pipeline fluid flow.

• Flush pipelines thoroughly before connecting the valve body to remove debris, scale, and welding beads.
• Connect the DN65 ASME BPE clamp connections using standard sanitary gaskets and clamps certified for process parameters.
• When installing in gas burner lines subject to DIN EN 161 approval, install a pipeline strainer upstream capable of retaining a 1 mm mandrel.

Actuator Disassembly and Body Connection Tightening Torques

When separating the pneumatic actuator from the CF3M valve body for maintenance or clamp installation, the valve must remain in the open position to prevent mechanical damage to the seat seal. Because control function B valves are held open by spring force, no pilot pressure is required during unthreading.

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

Before re-screwing the actuator into the body, inspect the body seal ring and coat threads with food-grade lubricant paste (Klüber paste UH1 96-402).

Turning the Actuator 360°

The pilot air interface can be indexed 360° to accommodate pipe runs and control head cabling.

1. Secure the valve body in a vice or holding device.
2. Ensure the valve remains open (spring-open rest state for CFB).
3. Place an open-end wrench on the hexagon flat of the body connection to hold it stationary.
4. Apply an open-end wrench to the drive connection hexagon nut and turn only in the counterclockwise direction shown in the drawing until aligned.

Rotational Direction Constraint

Rotate the actuator only in the specified direction. Turning the actuator in the opposite direction can loosen the body connection thread, causing media leakage.

Pneumatic Connection and Commissioning

Connect pilot air lines to pilot port 1 located on the actuator housing. The standard configuration uses 6 mm outer diameter pneumatic hoses inserted into the push-in connector.

• Supply fresh, uncontaminated compressed air or neutral gas. Do not use plant exhaust air containing lubricants or chemical solvents.
• Exhaust air from pilot port 2 vents through a supplied silencer. In aggressive industrial atmospheres, pipe free ports to a neutral atmosphere.
• Hose ratings must meet or exceed the maximum pilot pressure (7 bar) and ambient temperatures.

Commissioning Sequence

To prevent uncontrolled movement during initial system pressurization or after plant shut-downs: first connect and pressurize the pneumatic pilot system (2.5 to 7.0 bar), and only then charge the piping system with fluid media.

Maintenance and Troubleshooting

Perform regular visual inspections during scheduled maintenance intervals to ensure external and internal tightness.

Visual Leakage Inspection

Inspection Point	Observed Fault	Corrective Action
1. Media connectors	Fluid leakage at ASME BPE clamp interface	Inspect gasket, check clamp tightening torque, align piping
2. Relief bore	Fluid or pilot air leaking from actuator relief bore	Replace packing gland seal kit or complete actuator
3. Swivel plate / seat	Internal bypass leakage across valve seat	Replace worn PTFE swivel plate assembly

Troubleshooting Guide

Problem	Root Cause	Corrective Action
Actuator fails to switch	Pilot air port reversed	Connect pilot air supply exclusively to Port 1 for CFB
Actuator fails to switch	Insufficient pilot pressure	Increase pilot pressure to meet 2.5 to 7.0 bar specification
Actuator fails to switch	Line pressure exceeds limit	Verify pipeline operating pressure does not exceed 16 bar rating
Actuator fails to switch	Valve installed against flow	Align installation with body flow arrow (flow below seat)
Valve seat passes fluid (leaking)	Pilot pressure insufficient to hold closed	Increase pilot pressure to overcome seat counter-pressure
Valve seat passes fluid (leaking)	Particulates lodged on seat	Flush line; install upstream strainer (DIN EN 161)
Valve seat passes fluid (leaking)	PTFE swivel plate worn or deformed	Install a new Bürkert replacement swivel plate set
Leakage at actuator relief bore	Packing gland V-rings worn	Replace spindle packing gland using dedicated socket wrench

Packing Gland Replacement Tooling

Replacing the spindle packing gland requires the specialized deep socket wrench to avoid damaging guide bushings.

Spindle Diameter	Valve Nominal Diameter (DN)	Width Across Flats (AF)	Article Number
10 mm	DN 15 to DN 50	19 mm	683221
14 mm	DN 32 to DN 80	21 mm	683223

For DN65 (20078458), socket wrench article 683223 (AF 21 mm) is used.

Potentially Explosive Atmosphere (ATEX / IECEx) Requirements

Under supplemental standard code PX51, Type 2100 is approved as Category 2 non-electrical equipment for use in Zones 1/21 and 2/22 (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).

Temperature Class Boundaries

Temperature Class	Maximum Permissible Surface Temperature	Ambient Temperature Range	Maximum Medium Temperature
T2	300 °C	-40 °C to +130 °C	285 °C
T3	200 °C	-40 °C to +130 °C	185 °C
T4	135 °C	-40 °C to +100 °C	125 °C

Potential Equalization and Grounding

To prevent electrostatic discharge ignition hazards in classified areas:

1. Electrically bond the stainless steel CF3M valve body to the plant piping system via conductive clamp joints or bonding straps.
2. Ground all isolated conductive metal components using the grounding strap clamp or grounding terminal lug.
3. Clean the actuator housing surfaces only with a damp or antistatic cloth to prevent triboelectric charging.

Static Discharge Hazard

Accumulation of electrostatic charge on plastic actuator parts or insulated piping components presents an explosion hazard. The operator must ensure potential equalization across all conductive parts and prohibit dry wiping of the device in explosive gas or dust atmospheres.