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 or PPS housing ensures reliable use in hygienic or aggressive ambient conditions. The flow-efficient valve bodies with zero dead volume enable high flow rates and a wide range of possible uses in sterile applications. The valve body and the diaphragm are available in all common materials and variants. The actuator has a compact, autoclavable design with gap-free seals. The integration of automation units Type ELEMENT is possible in all configuration levels, and an explosion-proof ATEX/IECEx device variant is available.

It is a compact, smooth-surfaced, and highly integrated system consisting of a valve and an automation unit with integrated pilot air ducts (no intake of ambient air). The valve offers degrees of protection IP65/67 and NEMA Type 4X and displays high chemical resistance.

Control Functions

Symbol	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

• ATEX/IECEx: 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 EPS 18.0007X.
• 3-A Sanitary Standards Inc.: The products comply with 3-A Sanitary Standards Inc (3-A SSI) as per certificate (valid for variable code PE05).
• FDA: The diaphragms made of EPDM (AD), PTFE/EPDM (EA), Advanced PTFE/EPDM (EU), and laminate of GYLON® and EPDM (ER) 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.

Material Specifications

Actuator with PPS Housing

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 / 316L

Actuator with Stainless Steel Housing

No.	Element	Material
1	Transparent cover	Polysulfon PSU
2	Drive cover	Stainless steel 1.4308
3	Barrel liner	Stainless steel 1.4404
4	Piston seal	FKM
5	Nut	Stainless steel 1.4301
6	Diaphragm base	Stainless steel CF3M
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 / 316L

Technical Data

Permissible Ambient Temperature

Actuator housing material	Actuator size	Permissible ambient temperature [°C]
PPS	50 (D), 70 (M), 90 (N), 130 (P)	-10...+60 (Standard) / -10...+100 (Optional)
Stainless steel	225 (L)	-10...+100

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

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)

Installation Notes

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.

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

Explosion Hazard due to Electrostatic Charge (ATEX/IECEx)

If statically charged devices or persons discharge suddenly, there is an explosion risk in the potentially explosive area.

• Take appropriate measures to ensure that no electrostatic charge can build up in the potentially explosive area.
• Only clean the device surface by wiping it gently with a damp or antistatic cloth.
• Ground the actuator and the valve body.
• If a plastic valve body is used, ground the actuator separately.