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-optimized 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.

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 (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")

Approvals and Conformities

In accordance with the Declaration of Conformity, the product is compliant with the EU Directives.

• Explosion protection: As a category 2 device suitable for zone 1/21 and zone 2/22. ATEX: EPS 18 ATEX 2 008 X II 2G Ex h IIC T4...T2 Gb / II 2D Ex h IIIC T135 °C...T300 °C Db. IECEx: IECEx EPS 18.0007X Ex h IIC T4...T2 Gb / Ex h IIIC T135 °C...T300 °C Db.
• 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.

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), PTFE/EPDM (EA), advanced PTFE/EPDM (EU), laminate of GYLON® and EPDM (ER)
6	Valve body	See General technical data

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

Plastic Valve Body (PW, PV, PP, PD) with True Union

Diaphragm size	A	L1	L2	∅ d	h	H
PP (PP)
15	25	125	14.5	19.2	12	33
20	25	146	16	24.2	17	42
25	25	158	18	31.1	19	49
32	45	181	20.5	39	25	52.5
40	45	207	23.5	48.9	28.6	65.5
50	45	245	27.5	61.6	35.5	79

Performance Specifications

Maximum Permitted Medium Pressure

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

Pressure Temperature Diagram for Plastic Body

Note

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

Installation

WARNING

Risk of injury due to improper installation. Installation may be carried out by authorised technicians only and with the appropriate tools. Observe tightening torques.

Installation Position for Self-Draining

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

Tightening Torques for the Screws

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

TIP

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 all around the actuator and valve body.