What are the available diaphragm materials and their maximum temperature limits for the Burkert Type 2104 valve?

The Burkert Type 2104 valve offers five diaphragm material options with varying temperature limits. EPDM and Advanced PTFE handle medium temperatures up to +143 °C and withstand steam sterilization up to +150 °C for 60 minutes. Other options include FKM (up to +130 °C, no steam), PTFE (up to +130 °C), and GYLON® (up to +130 °C).

What materials are used for the actuator and actuator casing on the Burkert 2104 T-diaphragm valve?

The actuator materials depend on the nominal diameter of the valve. For sizes DN 08 to DN 65, the actuator is made of Polyphenylene sulphide (PPS) with a stainless steel 1.4561 (316Ti) casing. For larger sizes from DN 65 to DN 100, both the actuator and casing are constructed from stainless steel 1.4308.

What are the standard surface finish options for the valve body interior?

The interior of the stainless steel block body is available in two standard surface qualities. The internally electrically polished option provides a surface roughness of Ra ≤ 0.38 μm (ASME BPE SF4 / DIN HE4). The internally mechanically polished option offers a surface roughness of Ra ≤ 0.5 μm (ASME BPE SF1).

What control functions are available for the pneumatic actuator on this valve?

The Burkert Type 2104 pneumatic actuator can be configured with three different control functions. Control function A (CF A) is normally closed by spring force, control function B (CF B) is normally opened by spring force, and control function I (CF I) is pneumatically operated on either side without a default spring position.

What is the maximum allowable pilot pressure for operating the actuator?

The maximum pilot pressure for the Burkert Type 2104 actuator is generally 10 bar. However, for larger actuator sizes 130 and 225, the maximum pilot pressure is limited to 7 bar.

What hygienic and hazardous area certifications does the Burkert Type 2104 valve hold?

The valve holds multiple certifications for both sterile applications and explosive environments. Hygienic approvals include FDA, USP Class VI, 3-A Sanitary Standards, and EC Regulation 1935/2004. For hazardous areas, an explosion-proof variant is available with ATEX and IECEx certifications.

What is the ambient temperature range for the Burkert 2104 valve, and can it be autoclaved?

The allowable ambient temperature range for the valve is -10 °C to +60 °C. The actuator features a compact design with gap-free seals and is fully autoclavable for use in sterile environments.

BURKERT 20077617 2104 ELEMENT T-Diaphragm Valve, Stainless Steel, Pneumatic Actuator

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 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. 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

BURKERT 20077617 Burkert 2104 product overview and component diagram

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

Product properties	Description
Block body (VH/VI)	Stainless steel block material 1.4435 according to DIN EN 10088 and 316L according to ASTM A479 / A479M / 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
Diaphragm size	8...100
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). Externally Ra ≤ 1.6 μm
Maximum pilot pressure (SF A)	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
Nominal diameter	DN 06...DN 100 (1/8"...4")
Ambient temperature	-10 °C...+ 60 °C, autoclavable

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

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

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, 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: Suitable for use with food and beverages.
TA Luft: Technical instruction on air quality control (valid for variable code PM01).

Materials

BURKERT 20077617 Burkert 2104 material specifications diagram

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

Dimensions

Actuator

BURKERT 20077617 Burkert 2104 actuator dimensions

Diaphragm size	Actuator size ∅	∅ A	HS with 8691 / 8695	HS with 8690 / 8697	H+M (MT86)
8	50 (D)	65	232	219	138
15	50 (D)	65	240	226	146
15	70 (M)	92	262	229	166
20	70 (M)	92	262	229	166
25	70 (M)	92	268	235	172
25	90 (N)	120	301	269	205
32	90 (N)	120	313	280	217
40	90 (N)	120	317	285	221
40	130 (P)	160	370	337	274
50	130 (P)	160	379	346	282
65	130 (P)	160	383	350	287
65	225 (L)	245	427	395	330
80	225 (L)	245	433	401	336
100	225 (L)	245	429	397	332

T-Body with Welded Connection

BURKERT 20077617 Burkert 2104 T-Body with welded connection dimensions

(Excerpt for DIN EN ISO 1127 / ISO 4200 / DIN 11866 series B, Diaphragm size 8-25)

Diaphragm size	Port 1 – Port 2 DN	∅D1	s1	∅D2	s2	A	B	C	E	F	G	H	I
8	8...8	13.5	1.6	13.5	1.6	78.0	20.0	47.2	20.0	60.0	24.0	15.0	5.0
8	15...8	21.3	1.6	13.5	1.6	78.0	20.0	51.1	20.0	64.0	34.0	21.0	11.0
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
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

Details

Additional dimensions for ASME BPE, SMS 3008, DIN 11850, and clamp connections are available in the full technical documentation.

Installation and Safety

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.

DANGER

Electric shock due to electrical components Touching live parts can result in severe electric shock. Before working on the device or system, switch off the power supply and secure it against reactivation.

TIP

Installation Position Any installation position is possible, preferably with the actuator facing up. For T-valve bodies in circular pipelines, specific inclination angles are recommended for optimal draining.

BURKERT 20077617 Burkert 2104 recommended installation position for supply of medium

Welding the Valve Body

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

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

Troubleshooting

Cause	Solution
Actuator does not switch
Pilot air port interchanged	Connect the pilot air correctly (CF A: Port 1; CF B: Port 1; CF I: Port 1 Open, Port 2 Close).
Pilot pressure too low	Observe pressure data on the type label.
Operating pressure too high	Observe pressure data on the type label.
Valve is not tight
Pilot pressure too low	Observe pressure data on the type label.
Operating pressure too high	Observe pressure data on the type label.
Flow rate reduced
Bulging PTFE diaphragm	Replace the diaphragm.

Parameter	Value
Nominal diameter	DN 06...DN 100 (1/8"...4")
Maximum pilot pressure	10 bar (7 bar for actuator size 130, 225)
Medium temperature	-10 °C to +143 °C (EPDM/Advanced PTFE)
Ambient temperature	-10 °C to +60 °C (autoclavable)
Valve body material	Stainless steel block material 1.4435 / 316L
Actuator material	PPS (DN 08...65) / Stainless steel 1.4308 (DN 65...100)

BURKERT 20077617 2104 ELEMENT T-Diaphragm Valve, Stainless Steel, Pneumatic Actuator

Product Overview