BURKERT 20091109 Type 2933 is a 2/2-way diaphragm valve with a manually operated actuator. The manual actuator with a plastic handwheel is available with a diaphragm bonnet made of polyphenylene sulphide (PPS) and ensures use in hygienic or aggressive ambient conditions. The flow-optimized forged stainless steel 316L 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 equipped with an integrated visual position indicator, a reproducible stroke scale, and an adjustable closing limiter.

General Technical Data

Product Properties	Description
Valve body material	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	PTFE with EPDM backing membrane
Actuator	Polyphenylene sulphide (PPS) handwheel and bonnet
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 media
Medium temperature	-10 to +130 °C (steam sterilisation +140 °C for 60 min)
Ambient temperature	-10 to +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; IECEx Ex h IIC T4...T2 Gb / Ex h IIIC T135 °C...T300 °C Db.
• FDA: The PTFE/EPDM diaphragm complies with the Code of Federal Regulations published by the FDA.
• USP: Tested according to United States Pharmacopeial Convention (USP) Class VI.
• EC 1935/2004: Suitable for use with food and beverages according to EC Regulation 1935/2004/EC.

Materials

No.	Element	Material
1	Handwheel	Polyphenylene sulphide (PPS)
2	Visual position indicator	Polyamide (PA), Stainless steel 1.4305
3	Valve spindle	Stainless steel 1.4305
4	Diaphragm bonnet	Polyphenylene sulphide (PPS)
5	Diaphragm	PTFE/EPDM
6	Valve body	Forged stainless steel 316L/1.4435 BN2

Dimensions

Manual Actuator (Diaphragm Size 15...25)

Position open	Position closed

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

Forged Steel Valve Body (VS) with Clamp Connection

ASME BPE Dimensions (mm)

Diaphragm size	Port connection Inch	∅D1	s	∅D2	L	h	H
15	1/2"	12.7	1.65	25.0	89	8.15	19.85
15	3/4"	19.05	1.65	25.0	89	12.05	23.75
20	3/4"	19.05	1.65	25.0	102	16.0	30.3
25	1"	25.4	1.65	50.5	114	19.0	37.0

Performance Specifications

Flow Characteristics (Forged Steel Valve Body VS)

Diaphragm size	Port connection (ASME BPE)	Kv value water [m³/h]
15	1/2"	3.1
15	3/4"	6.5
20	3/4"	8.4
25	1"	15.5

INFO

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. The Kv values may vary slightly for different diaphragm materials.

Medium Pressure and Tightening Torques

Diaphragm size	Maximum static operating pressure [bar]	Tightening torque for PTFE/EPDM [Nm]
15	10	1.7
20	10	3.0
25	10	3.5

WARNING

The tightening torques refer to the static media pressures specified above. Excessive torque can shorten the service life of the diaphragm. A tolerance of +10% applies to the tightening torques specified.

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 and must point upwards.

Replacing the Diaphragm

1. Rotate the handwheel counterclockwise until it comes to a stop (OPEN position).
2. Loosen the fastening screws crosswise and remove the actuator with diaphragm from the valve body.
3. Rotate the handwheel clockwise until it comes to a stop (CLOSED position).
4. Loosen the PTFE diaphragm bayonet (for sizes 15 and 20) and insert a new diaphragm.
5. Rotate the handwheel counterclockwise until it comes to a stop (OPEN position).
6. Align the diaphragm. Identification tab is at a 90-degree angle to the flow direction.
7. Place the actuator together with diaphragm on the valve body and tighten the fastening screws crosswise in 3 stages.

DANGER

Risk of injury due to high pressure and escaping medium. Switch off the pressure before working on the device or system. Vent or empty the lines.