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 actuator features a compact, autoclavable design and is compatible with all other Burkert diaphragm valves. An explosion-proof ATEX/IECEx device variant is available. The manual actuator is equipped with an integrated visual position indicator, a reproducible stroke scale, and an adjustable closing limiter.

Note: The Type 293x family also includes the Type 2934 (T-valve body) and Type 2935 (tank bottom body).

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
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
Cast valve body (VG)	Stainless steel precision casting 1.4435 / 316L
Plastic valve body	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")
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.
• 3-A Sanitary Standards Inc.: Complies with 3-A SSI (valid for variable code PE05).
• FDA: Diaphragms 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.

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

Dimensions

Forged Steel Valve Body (VS) with Welded Connection

Dimensions in mm, unless otherwise stated. The table below shows the ASME BPE / DIN 11866 series C connections.

Diaphragm size	Port connection Inch	∅D1	s	L	h	H
8	1/4"	6.35	0.89	78	5.7	15.2
8	3/8"	9.53	0.89	89	5.7	15.2
8	1/2"	12.7	1.65	89	9.3	18.8
15	1/2"	12.7	1.65	108	8.15	19.85
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
50	2 1/2"	63.5	1.65	192	35.5	68.6
80	2 1/2"	63.5	1.65	250	51.0	98.1
80	3"	76.2	1.65	250	51.0	98.1
100	4"	101.6	2.11	295	63.5	127.0

Additional Connections

The Type 2933 is also available with clamp, threaded, flange, and true union connections across various body materials (Tube, Cast, Plastic). Please refer to the full manufacturer documentation for complete dimensional tables of these variants.

Performance Specifications

Maximum Permitted Medium Pressure

Diaphragm size	EPDM / FKM [bar]	PTFE / Advanced PTFE / GYLON® [bar]
8...40	10	10
50	7 / 10 (depending on actuator material)	7 / 10 (depending on actuator material)
65...80	10	10
100	6	6

Flow Characteristics (Kv Value Water)

Measurement at +20 °C, 4 bar at valve inlet and 3 bar at valve outlet. Values shown for Forged Steel Valve Body (ASME BPE / DIN 11866 series C).

Diaphragm size	Port connection Inch	Kv value [m³/h]
8	1/4"	0.7
8	3/8"	1.6
8	1/2"	1.5
15	1/2"	3.1
15	3/4"	6.5
20	3/4"	8.4
25	1"	15.5
40	1 1/2"	37
50	2"	66
50	2 1/2"	66
65	2 1/2"	110
80	3"	160
100	4"	235

Installation & Maintenance

Self-Draining Angle

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. The marking on the port connection of the valve body serves as an orientation aid and must point upwards.

Welding Instructions

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

Tightening Torques for Fastening Screws

Diaphragm size	VS, VG, PP, PVC-C, PVC-U, PVDF (EPDM/FKM) [Nm]	VS, VG, PP, PVC-C, PVC-U, PVDF (PTFE) [Nm]
8	2	2.5
15	3.5	4
20	4	4.5
25	5	6
32	6	8
40	8	10
50	12	15
65	20	30
80	30	40
100	40	40

A tolerance of +10% of the respective tightening torque applies to all values. Tighten each fastening screw in 3 stages crosswise.