BURKERT Type 2104 is an externally controlled diaphragm T-valve consisting of a pneumatically operated piston actuator, a diaphragm, and a T-valve body. The proven and robust actuator with a stainless steel housing ensures reliable use in hygienic or aggressive ambient conditions. The flow-efficient valve bodies with minimal dead space enable high flow rates and a wide range of possible uses. The actuator features a compact, autoclavable design with gap-free seals, making it highly suitable for decentralised automation in the food, beverage, biotechnology, and pharmaceutical industries.

It is a highly integrated system consisting of a valve and an automation unit with integrated pilot air ducts (no intake of ambient air). The integration of automation units Type ELEMENT is possible in all configuration levels, and a fieldbus interface can also be integrated. The valve offers IP65/67 and NEMA Type 4X protection degrees and displays high chemical resistance.

Product Overview

Component	Description
1	Pilot air port 1 for CF A, CF B and CF I
2	Pilot air port 2 for CF I, exhaust port for CF A and CF B
3	Transparent cap with position
4	Actuator cover
5	Actuator housing
6	Relief bore
7	Diaphragm
8	Port connection
9	Valve body
10	Diaphragm bonnet
11	Body screw

Approvals and Conformities

• 3-A Sanitary Standards: The products comply with 3-A Sanitary Standards Inc (3-A SSI) as per certificate.
• FDA: The diaphragms made of EPDM, PTFE/EPDM, Advanced PTFE/EPDM, and laminate of GYLON® and EPDM comply with the Code of Federal Regulations published by the FDA.
• USP: The diaphragms are tested according to USP Class VI.
• EC Regulation 1935/2004: Suitable for use with food and beverages.
• Explosion Protection: ATEX (II 2G Ex h IIC T4…T2 Gb / II 2D Ex h IIIC T135 °C…T300 °C Db) and IECEx approved variants available.

Material Specifications

No.	Element	Material
1	Ground terminal	Stainless steel 1.4301/1.4305 (only for ATEX/IECEx variant)
2	Transparent cap	Polysulfone PSU
3	Pilot air ports	Push-in connector PP (standard), Thread G 1/8" stainless steel 1.4305
4	Actuator	Polyphenylene sulphide PPS
5	Cover	Stainless steel 1.4561 (316Ti)
6	Piston seal	FKM
7	Diaphragm	EPDM (AD), PTFE/EPDM (EA), advanced PTFE/EPDM (EU), laminate of GYLON® and EPDM (ER)
8	Valve body	Stainless steel block material 1.4435 or 316L

Technical Data

General Operating Conditions

Property	Value
Maximum pilot pressure	10 bar (7 bar for actuator size 130, 225)
Pilot air port	Push-in connector for outer diameter, ∅ 6 mm or 1/4" (standard), thread G 1/8"
Operating medium	Neutral gases and liquids, highly purified, sterile, aggressive or abrasive mediums
Control medium	Neutral gases, air
Ambient temperature	-10 °C to +60 °C (autoclavable)

Medium Temperature for Diaphragms

Diaphragm material	Medium temperature [°C]	Comments
EPDM (AD)	-10...+143	Steam sterilisation max. +150°C for 60 min
FKM (FF)	0...+130	No steam, dry heat max +150°C for 60 min
PTFE (EA)	-10...+130	Steam sterilisation max. +140°C for 60 min
Advanced PTFE (EU)	-5...+143	Steam sterilisation max. +150°C for 60 min
GYLON® (ER)	-5...+130	Steam sterilisation max. +140°C for 60 min

WARNING

The specified medium temperatures only apply to media that do not attack the diaphragm materials or cause it to swell up. Do not use the diaphragms as a steam shut-off element.

Determination of Actuator Size

∅ A [mm]	Corresponds to actuator size
64.5	50 (D)
91	70 (M)
120	90 (N)
159	130 (P)
245	225 (L)

Control Functions

• Control function A (CF A): Pneumatically operated T-valve. Normally closed by spring force.
• Control function B (CF B): Pneumatically operated T-valve. Normally opened by spring force.
• Control function I (CF I): Pneumatically operated T-valve on either side. Switching position dependent on external control.

Installation Notes

TIP

For pipelines, the inclination angles specified in the valid ASME BPE standard are recommended. The device and relief bore must be accessible for inspection and maintenance. One of the relief bores in the diaphragm bonnet for monitoring leakages must be at the lowest position.

DANGER

Damage to the diaphragm or the actuator during welding: The diaphragm and actuator can be damaged when welding the valve body into the pipeline. In the case of devices with a welded connection, remove the actuator and diaphragm from the valve body before installation.

Tightening Torques for Body Connection

Diaphragm size	EPDM, FKM [Nm]	PTFE, advanced PTFE, GYLON® [Nm]
8	2	2.5
15	3.5	4
20	4	4.5
25	5	6
40	8	10
50	12	15
65	20	30
80	30	40
100	40	50

(Tolerance: +10 %)

Maintenance and Inspection

The device actuator is maintenance-free if the instructions in the operating instructions are followed. Components subject to natural wear are seals and the diaphragm.

Inspection intervals:

• After the first steam sterilisation and when required: Tighten the body screws crosswise.
• After 10^5 switching cycles at the latest: Check the diaphragm for wear.
• Shortened inspection intervals are required for muddy and abrasive media.