BURKERT 20149357 (Type 2933) is a 2/2-way manual diaphragm valve designed for reliable on/off control in demanding environments. This specific model features a DN 20 (NPS 3/4) welded connection, a flow-optimized stainless steel tube valve body (VP), and a high-temperature EPDM diaphragm. The manual actuator is equipped with a PPS handwheel, making it suitable for hygienic or aggressive ambient conditions. It is rated for a nominal pressure of 0 to 10 bar and can handle medium temperatures from -10 °C to 143 °C, including steam sterilization up to 150 °C for 60 minutes.

The actuator has a compact, autoclavable design and includes an integrated visual position indicator, a reproducible stroke scale, and an adjustable closing limiter to protect the diaphragm from excessive force. The valve is FDA and USP Class VI compliant, ensuring its suitability for food, beverage, and pharmaceutical applications.

Approvals and Conformities

• FDA: The EPDM diaphragm complies with the Code of Federal Regulations published by the FDA.
• USP: The EPDM diaphragm is tested according to USP Class VI.
• EC 1935/2004: Suitable for use with food and beverages according to EC Regulation 1935/2004/EC.

Explosion Protection

An explosion-proof ATEX/IECEx device variant is available. When used in potentially explosive atmospheres, ensure the device is properly grounded and observe all safety instructions regarding electrostatic charging.

Material Specifications

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	Stainless steel 1.4308, polyphenylene sulphide (PPS)
5	Diaphragm	EPDM high-temperature
6	Valve body	Stainless Steel Tube 316L/1.4435 BN2

Dimensions

Manual Actuator (Diaphragm Size 15)

Position open	Position closed

Diaphragm size	H1	H2	∅ B
15	84 mm	78 mm	45 mm

Tube Valve Body (VP) with Welded Connection

ASME BPE / DIN 11866 Series C

Diaphragm size	Port connection Inch	∅D1	s	L	h	H
15	3/4"	19.05	1.65	117	13.23	25.73

Performance Specifications

Flow Characteristics

• Kv value water: 7.1 m³/h (for Diaphragm size 15, 3/4" ASME BPE connection)
• Measurement at 20 °C, 4 bar at valve inlet and 3 bar at valve outlet.

Medium Pressure and Tightening Torque

WARNING

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

Diaphragm size	Maximum static operating pressure [bar]	Tightening torque (Static) [Nm]	Tightening torque (Dynamic) [Nm]
15	10	0.8	1.5

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 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 angle of inclination should correspond to the angle of inclination of the pipeline. The marking on the port connection of the valve body serves as an orientation aid and must point upwards.

Setting Stroke Limit

This model is fitted with a minimum stroke limiter which also serves as a closing limiter to protect the diaphragm.

1. Turn the handwheel clockwise to move the valve to the closed position.
2. Loosen the screw on the handwheel and remove it.
3. Screw the hexagon nut as far as it will go to set the minimum stroke.
4. Remount the handwheel, ensuring the square on the spindle and the hexagon head of the nut are correctly aligned.

TIP

Only tighten the device by hand when closing it, and do not use any tools or aids. Too much tightening may damage the device.