The Burkert 20111221 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 PPS actuator ensures reliable use in hygienic or aggressive ambient conditions. The flow-efficient stainless steel valve body features minimal dead space, enabling high flow rates and a wide range of possible uses. It is a compact, smooth-surfaced, and highly integrated system offering IP65/67 and NEMA Type 4X protection, with wetted surfaces polished to Ra ≤ 0.38 µm...≤ 1.6 µm.

General Technical Data

Product properties	Description
Block body material	Stainless steel block material 1.4435 according to DIN EN 10088 and 316L according to ASTM A479 / A479M
Diaphragm material	EPDM (AD), PTFE/EPDM (EA), Advanced PTFE/EPDM (EU), laminate of GYLON® and EPDM (ER)
Actuator material	DN 08...65, PPS; DN 65...100, stainless steel 1.4308
Actuator casing	DN 08...65, stainless steel 1.4561 (316Ti); DN 65...100, stainless steel 1.4308
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...+ 60 °C, autoclavable

Control Functions

Control Function	Description
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.

Approvals and Conformities

• Explosion Protection: ATEX (EPS 18 ATEX 2 008 X II 2G Ex h IIC T4…T2 Gb) and IECEx (IECEx EPS 18.0007X).
• 3-A Sanitary Standards: The products comply with 3-A Sanitary Standards Inc (3-A SSI) as per certificate.
• FDA: Diaphragms comply with the Code of Federal Regulations published by the FDA.
• USP: Diaphragms are tested according to USP Class VI.
• EC Regulation 1935/2004: Diaphragms are suitable for use with food and beverages.

Materials

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

Dimensions

Actuator

Diaphragm size	Actuator size ∅	∅ A	H+M (MT86)
8	50 (D)	65	138
15	50 (D)	65	146
15	70 (M)	92	166
20	70 (M)	92	166
25	70 (M)	92	172
25	90 (N)	120	205
40	90 (N)	120	221
50	130 (P)	160	282

T-Body with Welded Connection

(Dimensions in mm. Excerpt for DIN EN ISO 1127 / ISO 4200 / DIN 11866 series B)

Diaphragm size	Port 1 – Port 2 DN	∅D1	s1	∅D2	s2	A	B	C	E	F	G	H	I
15	15...15	21.3	1.6	21.3	1.6	93.0	20.0	56.0	20.0	71.0	35.0	21.0	6.5
15	20...15	26.9	1.6	21.3	1.6	103.0	25.0	59.8	20.0	78.0	42.0	25.0	11.5
20	20...20	26.9	1.6	26.9	1.6	114.0	25.0	70.3	25.0	87.0	40.0	24.0	6.0
25	25...25	33.7	2.0	33.7	2.0	124.5	25.0	78.6	25.0	98.0	53.0	33.0	13.0

Operating Conditions

Permissible Temperatures

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

Risk of bursting due to overpressure

If the device bursts, escaping media may cause injuries, burns or scalds. Observe the values indicated on the type label. Valves with reduced spring force require reduced pilot pressure.

Maximum Permissible Operating Pressure for Control Function A

Diaphragm size	Actuator size	Pilot pressure [bar]	Max operating pressure (EPDM, FKM) Dynamic [bar]	Max operating pressure (EPDM, FKM) Static [bar]
8	50 (D)	3.7...10	10	10
15	50 (D)	5.0...10	7.5	10
15	70 (M)	4.8...10	10	10
20	70 (M)	4.8...10	10	10
25	70 (M)	5.5...10	6.5	10
25	90 (N)	5.0...10	10	10

Installation Notes

Installation Recommendations

• Protect the device against electromagnetic interference, UV rays and, when installed outdoors, the effects of climatic conditions.
• Installation site must be easily accessible and provide sufficient space for installation, disassembly and maintenance.
• 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.

Damage to the diaphragm or the actuator

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.