BURKERT Type 2933 (SKU 20115523) manually operated diaphragm valve consists of a manually operated actuator, a diaphragm, and a 2-way valve body. The manual actuator with a plastic or stainless steel handwheel is available with a diaphragm bonnet made of stainless steel or plastic, ensuring reliable 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. The actuator features a compact, autoclavable design and is equipped with an integrated visual position indicator, a reproducible stroke scale, and an adjustable closing limiter.

General Technical Data

Product Properties	Description
Forged steel valve body (VS)	Forged stainless steel 1.4435 in accordance with BN2 DIN EN 10222-5, F316L in accordance with ASTM A182/A182M and 316L in accordance with ASME BPE
Diaphragm	EPDM (AD), PTFE/EPDM (EA), advanced PTFE/EPDM (EU), laminate of GYLON® and EPDM (ER)
Actuator	Stainless steel/PPS, PPS/PPS, stainless steel/stainless steel
Diaphragm size	8...100
Standard surface quality (VS)	Internally electrically polished: Ra ≤ 0.38 μm (ASME BPE SF4 / DIN HE4). Internally mechanically polished: Ra ≤ 0.5 μm (ASME BPE SF1)
Operating medium	Neutral gases and liquids, highly purified, sterile, aggressive or abrasive mediums
Medium temperature (EPDM)	-10...+143 °C (steam sterilisation +150 °C for 60 min)
Ambient temperature	-10...+130 °C (short-term up to +150 °C), autoclavable

Approvals and Conformities

• Explosion Protection: ATEX / IECEx Category 2 device suitable for zone 1/21 and zone 2/22 (valid for variable code PX51).
• Hygiene & Food: Complies with 3-A Sanitary Standards Inc., FDA Code of Federal Regulations, USP Class VI, and EC Regulation 1935/2004.

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	EPDM (AD), PTFE/EPDM (EA), advanced PTFE/EPDM (EU), laminate of GYLON® and EPDM (ER)

Function and Position Indicator

By manually overriding the handwheel, the force is transmitted via a spindle and the valve is opened or closed. Turning the handwheel anticlockwise opens the valve, turning it clockwise closes it.

Turning the handwheel counterclockwise reveals the yellow position indicator and the scale marked on it as the valve opens further. The scale on the handwheel determines the rotation position of the handwheel (30 positions for Type 2933).

Dimensions: Forged Steel Valve Body (VS) with Clamp Connection

Note: Dimensions in mm, unless otherwise stated. The table below shows ASME BPE dimensions as a representative selection.

Diaphragm size	Port connection Inch	∅D1	s	∅D2	L	h	H
8	1/2"	12.7	1.65	25.0	89	9.3	18.8
15	3/4"	19.05	1.65	25.0	89	12.05	23.75
20	3/4"	19.05	1.65	25.0	117	16.0	30.3
25	1"	25.4	1.65	50.5	114	19.0	37.0
40	1 1/2"	38.1	1.65	50.5	140	27.6	52.4
50	2"	50.8	1.65	64.0	159	35.5	68.3

Performance Specifications

Flow Characteristics (Kv Value Water)

Diaphragm size	Port connection (ASME BPE)	Kv value water [m³/h]
8	1/2"	1.5
15	3/4"	6.5
20	3/4"	8.4
25	1"	15.5
40	1 1/2"	37
50	2"	66

Maximum Permitted Medium Pressure

Diaphragm size	Maximum static operating pressure [bar]	Tightening torque (EPDM/FKM) [Nm]
8	10	0.6
15	10	0.8
20	10	0.9
25	10	1.2
32	10	2.5
40	10	4.5
50	10	6.0

Safety Instructions

• Risk of injury due to high pressure and escaping medium: Switch off the pressure before working on the device or system. Vent or empty the lines.
• Danger of bursting in case of overpressure: Do not exceed the maximum medium pressure. Observe specifications on the type label.

Installation Note

It is the responsibility of the installer and the operator to ensure self-draining. The angle of inclination should correspond to the angle of inclination of the pipeline. The marking on the port connection of the valve body serves as an orientation aid and must point upwards.