BURKERT Type 2933 (SKU: 20081942) is a 2/2-way manually operated diaphragm valve consisting of a manually operated actuator, an EPDM high-temperature diaphragm, and a forged stainless steel 2-way valve body. The manual actuator features a PPS plastic handwheel and a stainless steel diaphragm bonnet, ensuring reliable use in hygienic or aggressive ambient conditions. The flow-optimized valve body with minimum dead space enables high flow values (Kv 37 m³/h) and a wide range of possible applications. 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.

This specific model features a DN 40 (38.1x1.65) welded connection conforming to ASME BPE / DIN 11866 Series C / BS4825 standards. It is designed for a pressure range of 0 to 10 bar and medium temperatures from -10 °C to +143 °C. The valve is CIP and SIP capable, making it highly suitable for sterile and highly purified media applications.

• Valve body and diaphragm: Available in different materials and variants.
• Product wetted surfaces: Ra ≤ 0.38 µm…1.6 µm (electropolished).
• Approvals: ATEX, IECEx, FDA, USP Class VI, 3-A, and EC 1935/2004 compliant.

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) high-temperature
Actuator	Stainless steel bonnet / PPS handwheel
Diaphragm size	40
Standard surface quality	Internally electrically polished: Ra ≤ 0.38 μm (ASME BPE SF4 / DIN HE4)
Operating medium	Neutral gases and liquids, highly purified, sterile, aggressive or abrasive mediums
Medium temperature	-10...+143 °C (steam sterilisation +150 °C for 60 min)
Nominal diameter	DN 40 (NPS 1 1/2)
Welded connection	ASME BPE / DIN 11866 series C / BS4825
Ambient temperature	-10...+130 °C (short-term up to +150 °C), autoclavable

Approvals and Conformities

• Explosion Protection: ATEX (II 2G Ex h IIC T4...T2 Gb / II 2D Ex h IIIC T135 °C...T300 °C Db) and IECEx (Ex h IIC T4...T2 Gb / Ex h IIIC T135 °C...T300 °C Db). 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.
• FDA: The diaphragms made of 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)
6	Valve body	Forged stainless steel 316L/1.4435 BN2

Dimensions

Manual Actuator (Diaphragm Size 32...50)

Note: Dimensions in mm, unless otherwise stated.

Diaphragm size	H1	H2	∅ B
32	129	115	110
40	134	116	110
50	149	125	110

Forged Steel Valve Body (VS) with Welded Connection

Self-Draining Angle

Further information on the draining angle can be found in the "Supplementary instructions Type 2xxx 3xxx" on the manufacturer's website. The marking on the port connection of the valve body serves as an orientation aid and must point upwards.

ASME BPE / DIN 11866 series C

Diaphragm size	Port connection Inch	∅D1	s	L	h	H	Product key
8	1/4"	6.35	0.89	78	5.7	15.2	SA90
8	3/8"	9.53	0.89	89	5.7	15.2	SA91
15	1/2"	12.7	1.65	108	8.15	19.85	SA92
20	3/4"	19.05	1.65	117	16.0	30.3	SA93
25	1"	25.4	1.65	127	19.0	37.0	SODF
40	1 1/2"	38.1	1.65	159	27.6	52.4	SODH
50	2"	50.8	1.65	190	35.5	68.3	SODI
80	3"	76.2	1.65	250	51.0	98.1	SODK
100	4"	101.6	2.11	295	63.5	127.0	SODL

Performance Specifications

Flow Characteristics (Forged Steel Valve Body)

Note: Flow rate Kv value water (m³/h) for elastomer diaphragms. Measurement at +20 °C, 4 bar at valve inlet and 3 bar at valve outlet.

Diaphragm size	Port connection [inch]	Kv value water [m³/h] (ASME BPE)
8	1/4	0.7
15	1/2	3.1
20	3/4	8.4
25	1	15.5
40	1 1/2	37
50	2	66
65	2 1/2	110
80	3	160
100	4	235

Medium Pressure

Note: Pressure data [bar]: Overpressure to atmospheric pressure. Static: When closed, the valve is pressurised on one side with the maximum operating pressure.

Diaphragm size	Maximum static operating pressure [bar]	Tightening torque for max static pressure (EPDM) [Nm]
15	10	0.8
25	10	1.2
40	10	4.5
50	10	6
80	10	12

Installation Notes

Welding Preparations

To prevent damage, dismantle the actuator and diaphragm before welding the valve body into the pipeline. After welding, smooth the body surface (if necessary) by sanding and clean the valve body thoroughly before reassembling the diaphragm and actuator.

Explosion Hazard due to Electrostatic Charge

If the device is used in a potentially explosive area (Zone 1/21 or 2/22), ensure proper grounding of the valve body and actuator to prevent electrostatic discharge. Only wipe the device surfaces with a damp or anti-static cloth.