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 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.

Approvals and Conformities

• 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, 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 USP Class VI.
• EC Regulation 1935/2004: The diaphragms are suitable for use with food and beverages.
• Explosion Protection: As a category 2 device suitable for zone 1/21 and zone 2/22 (ATEX/IECEx).

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)
6	Valve body	Stainless steel tube 1.4435-BN2 / UNS S31603 (316L)

Technical Data

Operating Conditions

• Operating medium: Neutral gases and liquids, highly purified, sterile, aggressive or abrasive mediums.
• Medium temperature (Advanced PTFE/EPDM): -5...+143 °C (steam sterilisation +150 °C for 60 min).
• Ambient temperature: -10...+130 °C (short-term up to +150 °C), autoclavable.

Maximum Permitted Medium Pressure

Diaphragm size	Maximum permitted medium pressure [bar] (PTFE/advanced PTFE/GYLON®)
8	10
15	10
20	10
25	10
32	10
40	10
50	7 / 10

WARNING

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

Dimensions

Manual Actuator

Diaphragm size	H1	H2	∅ B
8	54	49	35
15	84	78	45
20	95	86	45
25	101	90	45
32	129	115	110
40	134	116	110
50	149	125	110

Tube Valve Body (VP) with Clamp Connection

Diaphragm size	Port connection DN/Inch	∅D1	s	∅D2	L	h	H
ASME BPE
15	3/4"	19.05	1.65	25.0	102	13.20	25.73
20	1"	25.4	1.65	50.5	114	16.40	41.65
32	1 1/2"	38.10	1.65	50.5	140	22.95	48.20
40	2"	50.80	1.65	64.0	159	30.60	62.60
50	2 1/2"	63.5	1.65	77.5	190	37.35	69.10

Installation and Maintenance

TIP

It is the responsibility of the installer and the operator to ensure self-draining. The marking on the port connection of the valve body serves as an orientation aid. The marking must point upwards.

Tightening Torques for Fastening Screws

Diaphragm size	Tightening torques [Nm] (VP Body, PTFE/advanced PTFE)
8	2.5
15	4
20	4.5
25	8
32	10
40	15
50	20

INFO

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.