The BURKERT 20023076 (Type 2105) is an externally controlled diaphragm valve consisting of a pneumatically operated piston actuator, a diaphragm, and a tank bottom valve body. The proven and robust actuator with a stainless steel or PPS housing ensures reliable 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, making it ideal for decentralised automation in the food, beverage, biotechnology, and pharmaceutical industries.

General Technical Data

Feature	Specification
Block body material	Stainless steel block material 1.4435 according to DIN EN 10088 and 316L according to ASTM A479 / A479M
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
Standard surface quality	Internally electrically polished: Ra ≤ 0.38 μm (ASME BPE SF4 / DIN HE4); externally Ra ≤ 1.6 μm
Maximum pilot pressure	10 bar (7 bar for actuator size 130, 225)
Operating medium	Neutral gases and liquids, highly purified, sterile, aggressive or abrasive mediums
Ambient temperature	-10 °C to +60 °C (autoclavable)

Approvals and Conformities

• Explosion Protection: ATEX (II 2G Ex h IIC T4…T2 Gb / II 2D Ex h IIIC T135 °C…T300 °C Db) and IECEx approved variants available.
• Foods and Beverages / Hygiene:
  • 3-A Sanitary Standards Inc.: Products comply with 3-A SSI.
  • FDA: Diaphragms comply with the Code of Federal Regulations published by the FDA.
  • USP: Diaphragms are tested according to USP Class VI.
  • EC Regulation 1935/2004: Suitable for use with food and beverages.

Material Specifications

No.	Element	Material
1	Valve body	Stainless steel
2	Diaphragm	EPDM (AD), PTFE/EPDM (EA), advanced PTFE/EPDM (EU), laminate of GYLON® and EPDM (ER)
3	Piston seal	FKM
4	Cover	Stainless steel 1.4561 (316Ti)
5	Actuator	Polyphenylene sulphide (PPS)
6	Transparent cap	Polysulfone (PSU)
7	Pilot air ports	Push-in connector PP (standard), Thread G 1/8" stainless steel 1.4305

Control Functions

• Control function A (CF A): Pneumatically operated tank bottom valve. Normally closed by spring force.
• Control function B (CF B): Pneumatically operated tank bottom valve. Normally opened by spring force.
• Control function I (CF I): Pneumatically operated tank bottom valve on either side. Switching position dependent on external control.

Installation and Welding

NOTICE: Damage to the diaphragm or the actuator

The diaphragm and actuator can be damaged when welding the valve body into the container base or the pipeline.

• In the case of devices with a welded connection, remove the actuator and diaphragm from the valve body before installation.
• Only use welding material suitable for the tank bottom valve body.
• Avoid the tank bottom valve coming into contact with other mounting parts. It must be possible to install and remove the actuator at any time without any hindrance.

Welding Sequence:

1. Weld the tank bottom valve body to the container base before the container is assembled. Weld the tank bottom valve body in the middle of the container base so that the container can be optimally drained.
2. Weld the tank bottom valve body into the pipeline.
3. After welding the surface of the valve body, smooth by sanding if necessary and clean carefully before reinstalling the actuator.

Product Identification

The type label includes essential information such as the control function, diaphragm size, diaphragm material, valve body material, pilot pressure, operating pressure, and permitted temperature ranges.

Explosion Hazard in Ex Areas

If a statically charged device or person discharges suddenly, there is an explosion hazard in the Ex area.

• Take suitable measures to ensure that no electrostatic charge can build up in the Ex area.
• Only clean the device surface by wiping it gently with a damp or antistatic cloth.
• Earth the actuator and the valve body.
• Only use cleaning agents approved for use in potentially explosive atmospheres.