BURKERT 20120238 (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. 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	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
Operating medium	Neutral gases and liquids, highly purified, sterile, aggressive or abrasive mediums
Ambient temperature	-10...+130 °C (short-term up to +150 °C), autoclavable

Approvals and Conformities

• 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.
• 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: Diaphragms are 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

Manual Actuator (Diaphragm size 8...25)

INFO

Dimensions in mm, unless otherwise stated.

Position open	Position closed

Diaphragm size	H1	H2	∅ B
8	54	49	35
15	84	78	45
20	95	86	45
25	101	90	45

Performance Specifications

Maximum Permitted Medium Pressure

WARNING

The following tightening torques refer to the static media pressures specified below. Excessive torque can shorten the service life of the diaphragm.

Diaphragm size	Maximum static operating pressure [bar] (EPDM/FKM)	Maximum static operating pressure [bar] (PTFE/advanced PTFE/GYLON®)
8	10	10
15	10	10
20	10	10
25	10	10
32	10	10
40	10	10
50	7 / 10	7 / 10
65	10	10
80	10	10
100	6	6

Pressure Temperature Diagram for Plastic Body

INFO

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

Installation and Operation

Position Indicator

Turning the handwheel counterclockwise reveals the yellow position indicator and the scale marked on it as the valve opens further. The scale on the handwheel determines the rotation position of the handwheel. The stroke scale shows the relative position of the valve and serves as a fixation point for determining the rotation position.

Self-Draining Installation

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.

DANGER

Explosion Hazard due to Electrostatic Charge! If statically charged devices or persons discharge suddenly, there is an explosion risk in the potentially explosive atmosphere.

• Take appropriate measures to ensure that no electrostatic charges can build up in the potentially explosive area.
• Only clean the device surface by wiping it gently with a damp or antistatic cloth.
• Earth the actuator and the valve body.
• If a plastic valve body is used, earth the actuator separately.