BURKERT 20130434 Type 2934 manually operated T-diaphragm valve consists of a manually operated actuator, a diaphragm, and a T-valve body. The manual actuator with a plastic or stainless steel handwheel is available with a diaphragm bonnet made of stainless steel or plastic, ensuring reliable 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 equipped with an integrated visual position indicator, a reproducible stroke scale, and an adjustable closing limiter.

General Technical Data

Product Properties	Description
Block body (VI)	Stainless steel block material 1.4435 according to DIN EN 10088 and 316L according to ASME BPE (Table MM-2.1.1, Ed. 2024)
Diaphragm	Advanced PTFE/EPDM (EU)
Actuator	Stainless steel/PPS, PPS/PPS, stainless steel/stainless steel
Standard surface quality	Internally electrically polished: Ra ≤ 0.38 μm (ASME BPE SF4/DIN HE4) (externally: Ra ≤ 1.6 μm)
Operating medium	Neutral gases and liquids, highly purified, sterile, aggressive or abrasive mediums
Medium temperature	-5...+143 °C (steam sterilisation + 150 °C for 60 min)
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/IECEx).
• 3-A Sanitary Standards: The products comply with 3-A Sanitary Standards Inc (3-A SSI).
• FDA: The diaphragms 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: Suitable for use with food and beverages.

Materials and Components

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	Advanced PTFE/EPDM (EU)
6	Valve body	Stainless steel block material

Performance Specifications

WARNING

The following tightening torques refer to the static media pressures specified. Excessive torque can shorten the service life of the diaphragm. Pressure data [bar]: Overpressure to atmospheric pressure.

Maximum Permitted Medium Pressure

Diaphragm size	Maximum permitted medium pressure [bar] (PTFE/advanced PTFE)
8 to 40	10
50	7 (for PPS handwheel) / 10
65 to 80	10
100	6

Tightening Torque for Maximum Static Operating Pressure

Diaphragm size	Maximum static operating pressure [bar]	Tightening torque (PTFE/advanced PTFE) [Nm]
8	10	1.1
15	10	1.7
20	10	3
25	10	3.5
32	10	4
40	10	7
50	10	11
65	10	21
80	10	23
100	10	24

Installation

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.

Installation Position of T-Valve Body

The following installation positions are recommended for the installation of the T-valves in circular pipelines to ensure proper self-draining capabilities:

TIP

For devices with welded connections, dismantle the actuator and diaphragm before welding the valve body to prevent damage. After welding, smooth the body surface if necessary and clean thoroughly before reassembly.

Tightening Torques for the Screws

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.

Diaphragm size	Tightening torques [Nm] (PTFE/advanced PTFE)
8	2.5
15	4
20	4.5
25	6
32	8
40	10
50	15
65	30
80	40
100	40

Maintenance

When used in accordance with the operating instructions, the actuator of the diaphragm valve is maintenance-free.

• After the first steam sterilisation, or when required, retighten the fastening screws crosswise.
• After a maximum of 10^5 switching cycles, check the diaphragm for wear.
• Muddy and abrasive media require correspondingly shorter inspection intervals.
• Conduct regular inspections of the relief bore to monitor for potential leakages.