Burkert 350318 Type 2104 is an externally controlled diaphragm T-valve consisting 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. This specific model features a stainless steel body with a DN 50 weld end connection and an advanced PTFE diaphragm with an EPDM backing membrane, making it highly suitable for the food and beverage, biotechnology, pharmaceutical, and cosmetics industries.

The actuator has a compact, autoclavable design with gap-free seals. It offers IP65/67 and NEMA Type 4X degrees of protection and displays high chemical resistance. The integration of automation units Type ELEMENT is possible in all configuration levels.

Product Overview

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

Control Function

This model operates with Control function A (CF A): Pneumatically operated T-valve, normally closed by spring force in the rest position.

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).
• Hygiene: 3-A Sanitary Standards Inc. compliant.
• FDA: The advanced PTFE/EPDM diaphragm complies with the Code of Federal Regulations published by the FDA.
• USP: Tested according to USP Class VI.
• EC Regulation 1935/2004: Suitable for use with food and beverages.

WARNING

Explosion Hazard due to Electrostatic Charge! If the device is used in a potentially explosive atmosphere (Zones 1/21 or 2/22), take appropriate measures to ensure that electrostatic charges cannot accumulate. Ground the actuator and valve body. Only wipe the device surfaces with a damp or anti-static cloth.

Technical Data

Property	Value
Block body material	Stainless steel block material 1.4435 according to DIN EN 10088 and 316L according to ASTM A479 / A479M
Diaphragm material	Advanced PTFE with EPDM backing membrane (EU)
Actuator material	PPS (Polyphenylene sulphide)
Maximum pilot pressure	10 bar (for actuator size 50 to 90)
Pilot air port	Push-in connector for outer diameter, ∅ 6 mm or 1/4" (standard)
Medium temperature	-5 °C to + 143 °C (steam sterilisation max. + 150 °C for 60 min)
Ambient temperature	-10 °C to + 60 °C, autoclavable

Dimensions

Actuator Size Determination

∅ A [mm]	Corresponds to actuator size
64.5	50 (D)
91	70 (M)
120	90 (N)
159	130 (P)
245	225 (L)

Actuator Dimensions

T-Body with Welded Connection

Installation Notes

TIP

Installation Position: The valve can be installed in any position, preferably with the actuator facing up. For self-draining capabilities, ensure the pipeline inclination angles comply with the valid ASME BPE standard, and one of the relief bores in the diaphragm bonnet is at the lowest position for leakage detection.

DANGER

Damage to the diaphragm or the actuator during welding! The diaphragm and actuator can be damaged when welding the valve body into the pipeline. Remove the actuator and diaphragm from the valve body before welding. After welding, smooth the surface by sanding if necessary and clean the valve body carefully before re-installing the actuator.

Tightening Torques for Body Connection

When re-installing the actuator, tighten the body screws crosswise in three stages (approx. 1/3, then 2/3, and then full tightening torque) without applying pilot pressure (for CF A).

Diaphragm size	Tightening torque for PTFE/Advanced PTFE [Nm] (tolerance: +10 %)
8	2.5
15	4
20	4.5
25	6
40	10
50	15
65	30
80	40
100	50