The Bürkert 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 minimal 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 features 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

Item	Description	Item	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

Product Identification

Type Label

Item	Description	Item	Description
1	Type	2	Control function
3	Diaphragm size (number) / actuator size (letter)	4	Diaphragm material
5	Valve body material	6	Pilot pressure
7	CE marking	8	Manufacture code
9	Port connection main dimensions	10	Operating pressure
11	Permitted medium temperature	12	Permitted ambient temperature
13	Article number

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)

General Technical Data

Product properties	Description
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 (Table MM- 2.1.1, Ed. 2024) BN2 available on request
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 (NO17) (ASME BPE SF4 / DIN HE4) (externally Ra ≤ 1.6 μm) Internally mechanically polished: Ra ≤ 0.5 μm (NO14) (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
Control medium	Neutral gases, air
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 Ex h IIC T4…T2 Gb / 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 (valid for the 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.

DANGER

Explosion Hazard due to Electrostatic Charging! If a statically charged device or person discharges 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 wipe the device surface gently with a damp or anti-static cloth. Ground the actuator and the valve body.

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 (AD), PTFE/EPDM (EA), advanced PTFE/EPDM (EU), laminate of GYLON® and EPDM (ER)
8	Valve body	Stainless steel

Dimensions

Actuator

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

(Dimensions in mm. Representative selection for DIN EN ISO 1127 / ISO 4200 / DIN 11866 series B)

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
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
40	40...40	48.3	2.0	48.3	2.0	152.0	25.0	100.0	25.0	128.0	68.0	41.0	12.4
50	50...50	60.3	2.0	60.3	2.0	188.0	30.0	120.2	30.0	154.0	82.0	48.0	12.5
65	65...65	76.1	2.0	76.1	2.0	210.0	30.0	144.4	30.0	186.0	97.0	55.0	12.9
80	80...80	88.9	2.3	88.9	2.3	255.0	30.0	163.1	30.0	212.0	119.0	71.0	20.0
100	100...100	114.3	2.3	114.3	2.3	290.0	30.0	209.1	30.0	270.0	133.0	72.0	8.5

T-Body with Clamp Connection

(Dimensions in mm. Clamp dimensions must be added to the welded connection dimensions. Representative selection for ASME BPE)

Port connection [mm]	Port connection [inch]	A	s	D3	E
8	1/4	6.35	0.89	25.0	28.6
10	3/8	9.53	0.89	25.0	28.6
15	1/2	12.7	1.65	25.0	28.6
20	3/4	19.05	1.65	25.0	28.6
25	1	25.4	1.65	50.5	28.6
40	1 1/2	38.1	1.65	50.5	28.6
50	2	50.8	1.65	64.0	28.6
65	2 1/2	63.5	1.65	77.5	28.6
80	3	76.2	1.65	91.0	28.6
100	4	101.6	2.11	119.0	28.6

Installation and Maintenance

TIP

Installation Position Any installation position is possible, preferably with the actuator facing up. For leakage detection, one of the relief bores in the diaphragm bonnet must be at the lowest position.

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

(Tolerance: +10 %)