BURKERT 20009833 (Type 2104) is an externally controlled pneumatic T-diaphragm valve configured in normally closed (NC) control function A, engineered for hygienic and process automation systems. The assembly integrates a pneumatically operated piston actuator encased in stainless steel with a high-integrity stainless steel block T-body. With nominal port size DN 40 and SMS 3008 pipe weld ends (outer diameter 38 mm, wall thickness 1.2 mm), the flow-efficient body profile minimizes dead space while supporting medium pressures from 0.00 bar to 10.00 bar (PN 16, Class 150) and medium operating temperatures between -5 °C and 130 °C.

Equipped with a high-performance sealing diaphragm fabricated from GYLON® laminated with an EPDM support backing (ER material code), the valve is CIP and SIP capable, supporting steam sterilisation cycles up to +140 °C for 60 minutes. The actuator construction combines polyphenylene sulphide (PPS) internals with a grade 1.4561 (316Ti) stainless steel outer casing and FKM dynamic piston seals. The pneumatic pilot interface follows the ELEMENT decentralized automation standard with push-in pneumatic connections for 6 mm outer diameter tubing.

Technical Specifications

Specification Parameter	Value
Article Number	20009833
Type Family	2104
Construction Type	Complete valve assembly
Fluidic Ports	3 ports, 2 switching positions (3/2-way T-valve)
Control Function	Control Function A (CF A, normally closed by spring force)
Nominal Diameter (DN)	DN 40 (40 mm)
Connection Standard	SMS 3008 weld end
Port 1 Outer Diameter (∅D1)	38.0 mm
Port 1 Wall Thickness (s1)	1.2 mm
Port 1 Inner Diameter	35.6 mm
Operating Medium Pressure	0.00 bar to 10.00 bar
Pressure Ratings	PN 16 (DIN EN 1333), Class 150 (DIN EN 1759)
Pilot Pressure Range	5.5 bar to 7.0 bar (SF A max rating 10 bar)
Pilot Air Interface	Interface ELEMENT, ∅ 6 mm push-in connector (G 1/8" optional)
Operating Medium Temperature	-5 °C to +130 °C
Ambient Temperature Limit	-5 °C to +55 °C (standard series -10 °C to +60 °C, autoclavable)
Valve Body Material	Stainless steel block 1.4435 (DIN EN 10088) / 316L (ASTM A479)
Internal Body Surface Finish	Electropolished Ra ≤ 0.38 µm (ASME BPE SF4) or mechanically polished Ra ≤ 0.5 µm
Diaphragm Material	GYLON® laminated with EPDM support membrane (ER)
Actuator Envelope Material	Stainless steel 1.4561 (316Ti)
Actuator Internal Material	Polyphenylene sulphide (PPS)
Piston Seal Material	FKM
Degree of Protection	IP65 / IP67, NEMA Type 4X
Cleaning Capabilities	CIP capable, SIP capable
Diaphragm Certificates	Factory certification 2.1 diaphragm, Manufacturer test report 3.1 enclosed

Control Function and Operating Parameters

Bürkert Type 2104 is operated using pneumatic pilot pressure directed into the ELEMENT actuator cap. For article 20009833, the operating mechanism is Control Function A:

• Control Function A (CF A): Pneumatically operated T-valve, normally closed by spring return force. Closing force is exerted mechanically via internal spring packs; pneumatic pilot air at 5.5 to 7.0 bar opens the seat port.
• Operating Medium Compatibility: Neutral gases and liquids, ultra-pure water, sterile media, and aggressive or abrasive process fluids.
• Pilot Media: Filtered air or neutral gases.

Steam Sterilisation Limit

The GYLON®/EPDM diaphragm (ER code) allows continuous fluid contact from -5 °C to +130 °C. Steam sterilisation is permitted up to +140 °C for a maximum duration of 60 minutes per cycle. Extending sterilisation cycle duration is permissible but reduces replacement maintenance intervals.

Material Specifications

Item No.	Component	Material
1	Ground terminal	Stainless steel 1.4301 / 1.4305 (supplied with ATEX / IECEx variants)
2	Transparent cap	Polysulfone (PSU)
3	Pilot air ports	Polypropylene (PP) push-in standard; threaded G 1/8" stainless steel 1.4305
4	Actuator core	Polyphenylene sulphide (PPS)
5	Actuator cover	Stainless steel 1.4561 (316Ti)
6	Piston seal	Fluoroelastomer (FKM)
7	Diaphragm	GYLON® laminated with EPDM support membrane (ER)
8	Valve body	Stainless steel block 1.4435 (DIN EN 10088) / 316L (ASTM A479)

All wetted diaphragm formulations for Type 2104 adhere to international hygienic regulations:

• FDA: Code of Federal Regulations title 21 compliance.
• USP: Tested and certified according to USP Class VI standards.
• EC Regulation 1935/2004: Certified for food contact and beverage media.

Dimensions and SMS 3008 Connection

Dimensions below reflect the SMS 3008 welded port configuration across diaphragm sizes:

Diaphragm Size	Port 1 – Port 2 DN	∅D1 [mm]	s1 [mm]	∅D2 [mm]	s2 [mm]	A [mm]	B [mm]	C [mm]	E [mm]	F [mm]	G [mm]	H [mm]	I [mm]	Product Key
25	25...25	25.0	1.2	25.0	1.2	124.5	25.0	75.0	25.0	95.0	43.0	27.0	7.0	SA60-SA60
25	40...25	38.0	1.2	25.0	1.2	124.5	25.0	81.5	25.0	103.0	58.0	36.0	16.0	SA62-SA60
25	50...25	51.0	1.2	25.0	1.2	134.5	30.0	88.0	25.0	118.0	72.0	42.0	22.0	SA63-SA60
40	40...40	38.0	1.2	38.0	1.2	152.0	25.0	95.6	25.0	121.0	58.0	35.0	6.4	SA62-SA62
40	50...40	51.0	1.2	38.0	1.2	162.0	30.0	102.1	25.0	131.0	73.0	44.0	15.4	SA63-SA62
50	50...50	51.0	1.2	51.0	1.2	188.0	30.0	120.2	30.0	154.0	82.0	48.0	2.5	SA63-SA63

For diaphragm size 40 on Type 2104, actuator dimensions depend on the specified drive diameter:

• Actuator Size 90 (N): Outer diameter ∅ A = 120 mm; total height H+M (MT86) = 221 mm; total height HS with 8691/8695 = 317 mm; total height HS with 8690/8697 = 285 mm.
• Actuator Size 130 (P): Outer diameter ∅ A = 160 mm; total height H+M (MT86) = 274 mm; total height HS with 8691/8695 = 370 mm; total height HS with 8690/8697 = 337 mm.

Explosion Protection and Grounding Requirements

Article 20009833 is qualified under ATEX and IECEx certificates for hazardous gas and dust zones:

• ATEX: EPS 18 ATEX 2 008 X — II 2G Ex h IIC T4…T2 Gb / II 2D Ex h IIIC T135 °C…T300 °C Db
• IECEx: IECEx EPS 18.0007X — Ex h IIC T4…T2 Gb / Ex h IIIC T135 °C…T300 °C Db

Temperature Class	Maximum Surface Temperature	Permissible Ambient Temperature	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

Electrostatic Hazard in Potentially Explosive Atmospheres

To prevent electrostatic charge discharge in ATEX/IECEx Zones 1/21 and 2/22, observe the fluid conductivity thresholds defined in IEC 60079-32-1:

1. Fluids with electrical conductivity ≤ 100 pS/m may only be conveyed if flow velocity does not exceed 1 m/s, or if pipeline dry-out is prevented by dedicated process monitoring.
2. Fluids with conductivity between 100 pS/m and 1,000 pS/m must be free of particulate matter, clean water vapour, or non-charging gases.
3. Media with conductivity > 1,000 pS/m can be transferred without fluid velocity restrictions.
4. Clean the external surfaces exclusively with a damp or anti-static cloth. Only use cleaning agents approved for hazardous locations.

Grounding Requirements

All metallic and conductive components must have separate grounding pathways:

1. Ground the stainless steel valve body directly to the plant pipework via conductive bonding.
2. Ensure exposed external metal components not integrated into the main equipotential bonding are connected via auxiliary earth connections.
3. Fit the grounding band clamp and ground terminal lugs securely to designated bonding points as illustrated in the ATEX instruction sheet.

Decentralised Automation Combinations

Type 2104 integrates directly with Bürkert ELEMENT top control heads and digital positioners through its internal air routing:

• Control Heads (Type 8691 / 8695): Optical status feedback via high-performance LEDs, contact-free inductive position sensor, and internal pilot solenoid with manual override.
• Pneumatic Feedback Units (Type 8690 / 8697): Mechanical or inductive limit switches for end-position signaling.
• Digital Positioners (TopControl Type 8692 / SideControl Type 8792): Continuous proportional control using contactless position feedback, automatic TUNE calibration, and fieldbus communication (IO-Link, büS, AS-Interface, PROFINET).
• Process Controllers (TopControl Type 8693 / SideControl Type 8793): Integrated PID loop control for flow, pressure, or temperature regulation directly on the valve actuator.

Modular Valve System Designations (8801-TB / 8802-TB)

When ordered as pre-tested integrated assemblies:

• Type 8801-TB-H: Type 2104 combined with control head Type 8691.
• Type 8801-TB-K: Type 2104 combined with pneumatic control unit Type 8690.
• Type 8802-TB-I: Type 2104 combined with digital positioner Type 8692.
• Type 8802-TB-J: Type 2104 combined with process controller Type 8693.