BURKERT Type 2933 (SKU 20121956) is a 2/2-way manually operated diaphragm valve designed for hygienic and aggressive ambient conditions. It consists of a manually operated actuator, a diaphragm, and a flow-optimized 2-way valve body with minimum dead space to enable high flow values. The manual actuator features a plastic or stainless steel handwheel with a diaphragm bonnet made of stainless steel or plastic. The actuator has a compact, autoclavable design and is equipped with an integrated visual position indicator, a reproducible stroke scale, and an adjustable closing limiter. The valve body and diaphragms are available in various materials, including forged stainless steel 316L and PTFE/EPDM, making it suitable for CIP/SIP processes and compliant with FDA and USP Class VI standards.

General Technical Data

Product properties	Specifications
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 (PTFE/EPDM)	-10...+130 °C (steam sterilisation +140 °C for 60 min)
Ambient temperature	-10...+130 °C (short-term up to +150 °C), autoclavable

Approvals and Conformities

• Explosion Protection: ATEX / IECEx (valid for variable code PX51). As a category 2 device suitable for zone 1/21 and zone 2/22.
• 3-A Sanitary Standards Inc.: The products comply with 3-A Sanitary Standards Inc (3-A SSI) as per certificate (valid for variable code PE05).
• FDA: The diaphragms made of EPDM, PTFE/EPDM, advanced PTFE/EPDM and laminate of GYLON® and EPDM comply with the Code of Federal Regulations published by the FDA.
• USP: The diaphragms are tested according to United States Pharmacopeial Convention (USP) Class VI.
• EC Regulation 1935/2004: Suitable for use with food and beverages.

Materials

Note

Your product variant may differ from this illustration depending on the body and interface options.

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 stroke scale shows the relative position of the valve and serves as a fixation point for determining the rotation position.

Dimensions

Forged steel valve body (VS) with welded connection

TIP

Dimensions in mm, unless otherwise stated. Further information on the draining angle can be found in the supplementary instructions.

Diaphragm size	Port connection DN	∅D1	s	L	h	H
DIN EN ISO 1127 / ISO 4200 / DIN 11866 series B
15	15	21.3	1.6	110	12.05	23.75
20	20	26.9	1.6	119	16.0	30.3
25	25	33.7	2.0	129	19.0	37.0
40	40	48.3	2.0	161	27.6	52.4
50	50	60.3	2.0	192	35.5	68.3
ASME BPE / DIN 11866 series C
15	3/4"	19.05	1.65	108	12.05	23.75
20	3/4"	19.05	1.65	117	16.0	30.3
25	1"	25.4	1.65	127	19.0	37.0
40	1 1/2"	38.1	1.65	159	27.6	52.4
50	2"	50.8	1.65	190	35.5	68.3

Performance Specifications

Maximum permitted medium pressure

Diaphragm size	Maximum permitted medium pressure [bar] (EPDM/FKM)	Maximum permitted medium pressure [bar] (PTFE/advanced PTFE)
8...40	10	10
50	7 / 10	7 / 10
65...80	10	10
100	6	6

(Note: 7 bar limit for size 50 applies to handwheel and diaphragm bonnet made from PPS)

Installation

Installation position for self-draining

It is the responsibility of the installer and the operator to ensure self-draining. The self-draining angle (α) depends on the valve body size and the inner diameter of the port connection (DN). The marking on the port connection of the valve body serves as an orientation aid and must point upwards.

WARNING

To prevent damage, dismantle the actuator and diaphragm before welding or bonding the valve body into the pipeline.

Tightening torques for the screws

Diaphragm size	Tightening torques [Nm] (VS, VG, PP, PVC-C, PVC-U, PVDF) - PTFE/advanced PTFE
15	4
20	4.5
25	6
32	8
40	10
50	15

(A tolerance of +10 % of the respective tightening torque applies to all values)