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 and ensures 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 valve body and the diaphragms are available in all common materials and variants.

The actuator has a compact, autoclavable design and is compatible with all other Bürkert 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. The manual actuator can optionally be equipped with sensors for position feedback.

Family Models

This product family includes several variants sharing the same actuator and diaphragm technology:

• Type 2933: 2-way valve body (basic)
• Type 2934: T-valve body (basic)
• Type 2935: Tank bottom body (basic)
• Type 2973 / 2974 / 2975: FullFunction variants equipped with minimum and maximum stroke limiters and a locking mechanism.

Product Variants

Example of the 2/2-way valve, Type 2933

Example of the diaphragm valve with T-body, Type 2934

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.: Valid for variable code PE05.
• FDA: Diaphragms made of EPDM, PTFE/EPDM, advanced PTFE/EPDM, and GYLON/EPDM comply with the Code of Federal Regulations.
• USP Class VI: Diaphragms are tested according to USP Class VI.
• EC Regulation 1935/2004: Suitable for use with food and beverages.

Explosion Protection (ATEX/IECEx)

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

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)
6	Valve body	Forged steel, tube, cast stainless steel, PVC-C, PVC-U, PP, PVDF

Operating Conditions

Maximum Permitted Medium Pressure

The values are valid for valve bodies made from plastic and stainless steel (block material, forged, cast, and tube).

Diaphragm size	Maximum permitted medium pressure [bar] (EPDM/FKM)	Maximum permitted medium pressure [bar] (PTFE/advanced PTFE/GYLON)
8 to 40	10	10
50	7 / 10 (7 bar for PPS handwheel/bonnet)	7 / 10 (7 bar for PPS handwheel/bonnet)
65 to 80	10	10
100	6	6

Pressure Temperature Diagram for Plastic Body

This information is important for material selection. Observe the permissible operating pressure depending on the medium temperature.

Performance Specifications

Flow Characteristics (Forged Steel Valve Body VS)

Note: The Kv values may vary slightly for different diaphragm materials. Measurement at +20 °C, 4 bar at valve inlet and 3 bar at valve outlet.

Diaphragm size	Port connection DN	Kv value water [m³/h] (ASME BPE / DIN 11866 series C)
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
65	2 1/2"	110
80	3"	160
100	4"	235

Installation for Self-Draining

It is the responsibility of the installer and the operator to ensure self-draining. The self-draining angle 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.