Burkert 20135287 Type 2933 is a 2/2-way manually operated diaphragm valve consisting of a manual actuator, a GYLON®/EPDM laminated diaphragm, and a forged stainless steel 2-way valve body. The manual actuator features a plastic handwheel suitable for hygienic or aggressive ambient conditions. The flow-optimized valve body with minimum dead space enables high flow values (Kv value 37.5 m³/h for water). 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	Specification
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
Diaphragm	Laminate of GYLON® and EPDM (ER)
Actuator	Polyphenylene sulphide (PPS) handwheel, stainless steel 1.4308 diaphragm bonnet
Diaphragm size	40
Standard surface quality	Internally electrically polished: Ra ≤ 0.38 μm (ASME BPE SF4 / DIN HE4)
Medium temperature	-5 °C to +130 °C (steam sterilisation max. +140 °C for 60 min)
Nominal diameter	DN 40 (NPS 1 1/2)
Clamp connection	ASME BPE / BS4825-3 (38.1x1.65 Cl: 50.5)

Approvals and Conformities

• FDA: The diaphragms made of laminate of GYLON® and EPDM (ER) comply with the Code of Federal Regulations published by the FDA.
• USP: Tested according to United States Pharmacopeial Convention (USP) Class VI.
• EC Regulation 1935/2004: Suitable for use with food and beverages.
• Explosion Protection: ATEX/IECEx approved as a category 2 device suitable for zone 1/21 and zone 2/22 (Ex h IIC T4...T2 Gb / Ex h IIIC T135 °C...T300 °C Db).

Material Specifications

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	Laminate of GYLON® and EPDM (ER)
6	Valve body	Forged stainless steel 316L/1.4435 BN2

Dimensions

Manual Actuator

Position open	Position closed

For diaphragm size 40:

• H1: 134 mm
• H2: 116 mm
• Ø B: 110 mm

Forged Steel Valve Body (VS) with Clamp Connection

ASME BPE Dimensions (Diaphragm Size 40, DN 40 / 1 1/2 inch):

• ∅ D1: 38.1 mm
• s: 1.65 mm
• ∅ D2: 50.5 mm
• L: 140 mm
• h: 27.6 mm
• H: 52.4 mm

Performance Specifications

Flow Characteristics

For the forged steel valve body (VS) with ASME BPE clamp connection (Diaphragm size 40, 1 1/2 inch), the Kv value for water is 37 m³/h. 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 static media pressures. Excessive torque can shorten the service life of the diaphragm.

For diaphragm size 40 with GYLON®/EPDM diaphragm:

• Maximum static operating pressure: 10 bar
• Tightening torque for maximum static operating pressure: 7 Nm

Installation

TIP

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 according to the valid ASME BPE.

The marking on the port connection of the valve body serves as an orientation aid and must point upwards. The actual self-draining angle must be set with a suitable measuring tool.