BURKERT Type 2104 externally controlled diaphragm valve consists of a pneumatically operated piston actuator, a diaphragm, and a T-valve body. The flow-efficient valve bodies with little dead space enable high flow rates and a wide range of possible uses. 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, and a fieldbus interface can also be integrated. An explosion-proof ATEX/IECEx device variant is available.

General Technical Data

Product Properties	Specification
Block body (VH)	Stainless steel block material 1.4435 according to DIN EN 10088 and 316L according to ASTM A479 / A479M
Block body (VI)	Stainless steel block material 1.4435 according to DIN EN 10088 and 316L according to ASME BPE
Diaphragm	EPDM (AD), PTFE/EPDM (EA), Advanced PTFE/EPDM (EU), laminate of GYLON® and EPDM (ER)
Actuator	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); Internally mechanically polished: Ra ≤ 0.5 μm (ASME BPE SF1)
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"

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 / II 2D Ex h IIIC T135 °C…T300 °C Db) and IECEx (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 the variable code PE05).
• 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: The diaphragms are suitable for use with food and beverages.

Operating Conditions

Permissible Temperatures

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

Diaphragm material	Medium temperature [°C]	Comments
EPDM (AD)	-10...+143	Steam sterilisation 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

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.

Installation

WARNING

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

Without applying pressure, tighten the body screws in three stages (approx. 1/3, then 2/3 and then full tightening torque), in each case crosswise. The diaphragm should be positioned and pressed evenly all around the actuator and valve body.

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