The Bürkert Type 2933 (SKU 20128584) manually operated diaphragm valve consists of a manually operated actuator, a diaphragm, and a 2-way valve body. The manual actuator with a stainless steel or plastic handwheel is available with a diaphragm bonnet made of stainless steel or plastic, ensuring use in hygienic or aggressive ambient conditions. The flow-optimised valve body with minimum dead space enables high flow values and a wide range of possible applications.

This specific model features a DN 20 welded connection, an investment cast 316L/1.4435 stainless steel valve body, and a PTFE diaphragm with an EPDM backing membrane. The actuator has a compact, autoclavable design and is compatible with all other Bürkert diaphragm valves.

General Technical Data

Feature	Specification
Valve body material	Investment cast material 316L/1.4435
Diaphragm material	PTFE with EPDM backing membrane
Port connection	Welded (DIN EN ISO 1127 / ISO 4200 / DIN 11866 Series B)
Nominal diameter	DN 20 (26.9 x 1.6 mm)
Medium temperature	-10 °C to +130 °C (steam sterilisation +140 °C for 60 min)
Nominal pressure	0 to 10 bar (PN 10)
Kv value (water)	10.5 m³/h

Approvals and Conformities

• FDA: The PTFE/EPDM diaphragms comply with the Code of Federal Regulations published by the FDA (Food and Drug Administration, USA).
• USP: Tested according to United States Pharmacopeial Convention (USP) Class VI.
• EC Regulation 1935/2004: Suitable for use with food and beverages.

Material Specifications

No.	Element	Material
1	Handwheel	Polyphenylene sulphide (PPS), stainless steel 1.4308
2	Visual position indicator	Polyamide (PA), Stainless steel 1.4305
3	Valve spindle	Stainless steel 1.4305
4	Diaphragm bonnet	Stainless steel 1.4308, polyphenylene sulphide (PPS)
5	Diaphragm	PTFE/EPDM
6	Valve body	Investment cast 316L/1.4435

Dimensions: Cast Valve Body (VG) with Welded Connection

DIN EN ISO 1127 / ISO 4200 / DIN 11866 series B

Diaphragm size	Port connection DN	∅ D1	s	L	h	H
20	20	26.9	1.6	119	18.0	32.7

(Note: Dimensions in mm. Extract showing the DN 20 size for this specific model).

Performance Specifications

Flow Characteristics (Cast Valve Body VG)

• Diaphragm size: 20
• Port connection: DN 20 (3/4 inch)
• Kv value water: 10.7 m³/h (Standard value; specific SKU is calibrated to 10.5 m³/h)

Medium Pressure and Tightening Torque For PTFE/EPDM diaphragms at a maximum static operating pressure of 10 bar:

• Diaphragm size 20: 3 Nm tightening torque.

Tightening Torque

A tolerance of +10% applies to the tightening torques specified. Excessive torque can shorten the service life of the diaphragm.