Burkert Type 2104 externally controlled diaphragm valve consists 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 little dead space enable high flow rates and a wide range of possible uses. The valve body and the diaphragm are available in all common materials and variants.

The actuator has a compact, autoclavable design with a large stainless steel housing and gap-free seals. The integration of automation units Type ELEMENT is possible in all configuration levels (can be retrofitted); a fieldbus interface can also be integrated. It is a highly integrated system consisting of a valve and an automation unit with integrated pilot air ducts (no intake of ambient air).

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

General Technical Data

Property	Value
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
Standard surface quality	Internally electrically polished: Ra ≤ 0.38 μm (ASME BPE SF4 / DIN HE4)
Operating medium	Neutral gases and liquids, highly purified, sterile, aggressive or abrasive mediums
Control medium	Neutral gases, air

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/IECEx variants available (II 2G Ex h IIC T4…T2 Gb / II 2D Ex h IIIC T135 °C…T300 °C Db).
• 3-A Sanitary Standards: The products comply with 3-A Sanitary Standards Inc (valid for the variable code PE05).
• FDA: Diaphragms comply with the Code of Federal Regulations published by the FDA.
• USP: Diaphragms are tested according to USP Class VI.
• EC 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, PTFE/EPDM, advanced PTFE/EPDM, laminate of GYLON® and EPDM
8	Valve body	Stainless steel

Operating Conditions

Risk of bursting due to overpressure

If the device bursts, escaping media may cause injuries, burns or scalds. Observe the maximum pilot and operating pressure values indicated on the type label.

Medium Temperature for Diaphragms:

• EPDM (AD): -10 °C...+143 °C (Steam sterilisation max. +150 °C for 60 min)
• PTFE/EPDM (EA): -10 °C...+130 °C (Steam sterilisation max. +140 °C for 60 min)
• Advanced PTFE/EPDM (EU): -5 °C...+143 °C (Steam sterilisation max. +150 °C for 60 min)
• GYLON® and EPDM (ER): -5 °C...+130 °C (Steam sterilisation max. +140 °C for 60 min)

Installation Notes

Installation Position

The valve can be installed in any position, preferably with the actuator facing up. For pipelines, the inclination angles specified in the valid ASME BPE standard are recommended to ensure the valve is self-draining.

Weld the valve body into the pipeline: 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. After welding the surface of the valve body, smooth by sanding if necessary and clean the valve body carefully before reinstalling the actuator.