Type 2032
BURKERT 20134740 Type 2974 manually operated T-diaphragm valve consists of a manually operated actuator, a diaphragm, and a T-valve body. The manual actuator with a plastic handwheel (PPS) ensures reliable use in hygienic or aggressive ambient conditions. The flow-optimized valve body with minimum dead space enables high flow values and a wide range of possible applications in the food, beverage, biotechnology, and pharmaceutical industries.
The actuator features a compact, autoclavable design and is equipped with a visual position indicator with a reproducible stroke scale. The Type 2974 (FullFunction) actuator also possesses an adjustable minimum and maximum stroke limitation and a locking mechanism to prevent accidental or unauthorized operation.
General Technical Data
| Product Properties | Specification |
|---|---|
| Block body material | Stainless steel block material 1.4435 according to DIN EN 10088 and 316L according to ASTM A479 / A479M |
| Diaphragm material | Advanced PTFE with EPDM backing membrane |
| Actuator material | Stainless steel bonnet / PPS handwheel |
| Diaphragm size | 25 |
| 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 |
| Port connection | DN 25 (NPS 1) - 33.7x2.0, Welded (DIN EN ISO 1127 / ISO 4200 / DIN 11866 series B) |
Approvals and Conformities
- FDA: The diaphragms comply with the Code of Federal Regulations published by the FDA (Food and Drug Administration, USA).
- USP: The diaphragms are tested according to United States Pharmacopeial Convention (USP) Class VI.
- EC Regulation 1935/2004: The diaphragms are suitable for use with food and beverages.
- Explosion Protection (Optional): As a category 2 device suitable for zone 1/21 and zone 2/22 (ATEX/IECEx).
Material Specifications
| No. | Element | Material |
|---|---|---|
| 1 | Lock pin | Stainless steel 1.4305 |
| 2 | Screw | Stainless steel A2 |
| 3 | Handwheel cover | Polyamide (PA) |
| 4 | Handwheel | Polyphenylene sulphide (PPS) |
| 5 | Visual position indicator | Polyamide (PA) |
| 6 | Valve spindle | Stainless steel 1.4305 |
| 7 | Diaphragm socket | Stainless steel 1.4308 |
| 8 | Diaphragm | Advanced PTFE/EPDM |
| 9 | Valve body | Stainless steel block material |
Dimensions
T-body with welded connection (DIN EN ISO 1127 / ISO 4200 / DIN 11866 series B)
| Diaphragm size | Port 1 - Port 2 DN | ∅D1 | s1 | ∅D2 | s2 | A | B | C | E | F | G | H | I |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 25 | 25...25 | 33.7 | 2.0 | 33.7 | 2.0 | 124.5 | 25 | 78.6 | 25 | 98 | 53 | 33 | 13.0 |
(Dimensions in mm. Table filtered to match the DN 25 welded connection of SKU 20134740).
Performance Specifications
INFO
The following tightening torques refer to the static media pressures specified. Excessive torque can shorten the service life of the diaphragm. A tolerance of +10% applies to the tightening torques specified.
| Diaphragm size | Maximum static operating pressure [bar] | Tightening torque for advanced PTFE/EPDM [Nm] |
|---|---|---|
| 25 | 10 | 3.5 |
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 self-draining:
Welding Preparations: The actuator and diaphragm must be dismantled before welding the valve body into the pipeline to prevent damage to the components.
Setting Stroke Limit
A minimum and maximum stroke limit can be set for Type 2974 using the integrated adjusting sleeve.
- By turning the handwheel clockwise, the valve is moved to the closed position.
- Loosen the screw on the handwheel (hexagon socket, width across flats 2) and remove the handwheel.
- Screw the adjusting sleeve clockwise until it comes to a stop. Minimum stroke is set.
- Mount the handwheel on the actuator. Move the valve to the desired maximally open position.
- Loosen the screw on the handwheel and remove the handwheel.
- Pull the adjusting sleeve upwards and at the same time, screw anticlockwise until it comes to a stop. Maximum stroke is set.
- Mount the handwheel on the actuator and tighten the screw with 0.9 Nm.
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