Burkert 2104 externally controlled T-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 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 actuator has a compact, autoclavable design with gap-free seals. The integration of automation units Type ELEMENT is possible in all configuration levels; a fieldbus interface can also be integrated. 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.

Product Overview

No.	Description	No.	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 / ASME BPE
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); 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"
Operating medium	Neutral gases and liquids, highly purified, sterile, aggressive or abrasive mediums
Ambient temperature	-10 °C...+ 60 °C (PPS actuator), -10 °C...+ 100 °C (Stainless steel actuator)

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

Approvals and Conformities

• ATEX / IECEx: II 2G Ex h IIC T4…T2 Gb / II 2D Ex h IIIC T135 °C…T300 °C Db
• 3-A Sanitary Standards Inc.: The products comply with 3-A Sanitary Standards Inc (3-A SSI) as per certificate.
• FDA: The diaphragms 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.

Dimensions

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)

T-Body with Welded Connection

(Note: Dimensions vary extensively by standard (DIN EN ISO 1127, ASME BPE, SMS 3008, etc.) and nominal diameter. Please refer to the full technical datasheet for comprehensive dimensional tables.)

T-Body with Clamp Connection

(Note: Clamp dimensions must be added to the welded connection dimensions.)

Installation

Installation for leakage detection

One of the relief bores in the diaphragm bonnet for monitoring leakages must be at the lowest position.

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.

Aligning the Actuator

On valves with a stainless steel diaphragm bonnet, the actuator can be rotated continuously through 360° relative to the valve body.

Turn the actuator using a hook wrench. Turn the actuator only as far as necessary (max. 360°).

Actuator size [ø mm]	Recommended hook wrenches (A) as per DIN 1810
50 (D)	A 52...55
70 (M)...130 (P)	A 68...75

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

Maintenance and Repair

Risk of injury from sudden discharge of pressure and escaping medium

Disassembling a pressurised device can cause medium to escape unexpectedly or a sudden discharge of pressure. This can cause serious injuries. Before disassembly, shut off the pressure and vent all lines. Completely drain the lines.

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.

Types of diaphragm fastening:

Diaphragm size	PTFE and advanced PTFE	EPDM, FKM and GYLON®
≤8	Diaphragm fastening using buttons	Diaphragm fastening using buttons
15, 20	Diaphragm fastening using bayonet catch	Diaphragm fastening using bayonet catch
≥25	Diaphragm fastening using bayonet catch	Diaphragm fastening using threaded connection