The Burkert Type 2933 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 suitability for hygienic or aggressive ambient conditions. The flow-optimized valve body with minimum dead space enables high flow values and a wide range of possible applications.

The valve body and diaphragms are available in all common materials and variants. The actuator features a compact, autoclavable design and is compatible with all other Burkert diaphragm valves. The manual actuator is equipped with an integrated visual position indicator, a reproducible stroke scale, and an adjustable closing limiter.

General Technical Data

Product Properties	Specification
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
Tube valve body (VP)	Stainless steel tube 1.4435-BN2 / UNS S31603 (316L) according to DIN 11866, ASTM A269 / A270, DIN EN 10217-7 / 10216-5
Plastic valve body (PW, PV, PP, PD)	PVC-C, PVC-U, PP, PVDF
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
Nominal diameter	DN 06...DN 100 (1/8"...4")
Medium temperature (EPDM)	-10...+143 °C (steam sterilisation +150 °C for 60 min)
Medium temperature (Advanced PTFE)	-5...+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).
• 3-A Sanitary Standards Inc.: The products comply with 3-A Sanitary Standards Inc (3-A SSI) as per certificate.
• FDA: Diaphragms made of EPDM, PTFE/EPDM, advanced PTFE/EPDM, and GYLON®/EPDM comply with the Code of Federal Regulations published by the FDA.
• USP: Diaphragms are tested according to United States Pharmacopeial Convention (USP) Class VI.
• EC Regulation 1935/2004: Suitable for use with food and beverages.

ATEX/IECEx Safety Note

If the device is used in a potentially explosive atmosphere, ensure proper grounding of the valve body and actuator to prevent electrostatic charging hazards. Only use cleaning agents certified for explosive environments.

Materials

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, PTFE/EPDM, advanced PTFE/EPDM, laminate of GYLON® and EPDM

Dimensions

Manual Actuator (Diaphragm Size 8...25)

Diaphragm size	H1	H2	∅ B
8	54	49	35
15	84	78	45
20	95	86	45
25	101	90	45

Forged Steel Valve Body (VS) with Welded Connection

Diaphragm size	Port connection DN	∅D1	s	L	h	H
DIN EN ISO 1127 / ISO 4200 / DIN 11866 series B
8	8	13.5	1.6	90	9.3	18.8
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
8	1/2"	12.7	1.65	89	9.3	18.8
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

Forged Steel Valve Body (VS) with Clamp Connection

Diaphragm size	Port connection DN/Inch	∅D1	s	∅D2	L	h	H
DIN 32676 series B (ISO pipe)
15	15	21.3	1.6	50.5	167	12.05	23.75
20	20	26.9	1.6	50.5	114	16.0	30.3
25	25	33.7	2.0	50.5	129	19.0	37.0
40	40	48.3	2.0	64.0	161	27.6	52.4
50	50	60.3	2.0	77.5	190	35.5	68.3
ASME BPE
15	3/4"	19.05	1.65	25.0	89	12.05	23.75
20	3/4"	19.05	1.65	25.0	102	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

Additional Body Variants

Dimensions for Tube Valve Bodies (VP), Cast Valve Bodies (VG), and Plastic Valve Bodies (PV, PP, PD) are also available. Please consult the full manufacturer documentation for complete dimensional tables of these variants.

Performance Specifications

Flow Characteristics (Forged Steel Valve Body VS)

Diaphragm size	Port connection (ASME BPE)	Kv value water [m³/h]
8	1/2"	1.5
15	3/4"	3.1
20	3/4"	8.4
25	1"	15.5
40	1 1/2"	37
50	2"	66

Medium Pressure

Diaphragm size	Maximum static operating pressure [bar]	Tightening torque EPDM/FKM [Nm]	Tightening torque PTFE/Advanced PTFE [Nm]
8	10	0.6	1.1
15	10	0.8	1.7
20	10	0.9	3.0
25	10	1.2	3.5
32	10	2.5	4.0
40	10	4.5	7.0
50	10	6.0	11.0

Pressure Temperature Diagram for Plastic Body

Installation and Maintenance

Installation Position

The installation position is generally arbitrary, but preferably with the actuator facing up. To ensure self-draining, observe the specific self-draining angle (α) marked on the valve body and align the pipeline accordingly.

Tightening Torques: When installing the device, tighten each fastening screw in 3 stages (approx. 1/3, approx. 2/3, 3/3 of the tightening torque) crosswise. The diaphragm should be positioned and pressed evenly around the actuator and valve body. Excessive torque can shorten the service life of the diaphragm.