Hygienic Design
Burkert Type 2973 manually operated diaphragm valve consists of a manually operated actuator, a diaphragm, and a 2-way body. The manual actuator with a plastic handwheel ensures 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. The valve body and the diaphragms are available in all common materials and variants. The actuator has a compact, autoclavable design and is compatible with all other Bürkert diaphragm valves.
The manual actuator possesses a visual position indicator with a reproducible stroke scale. The actuator also possesses an adjustable minimum and maximum stroke limitation and/or locking. The manual actuator can be optionally equipped with sensors for position feedback.
- Valve body and diaphragm are available in different materials and variants
- Wetted surfaces from Ra ≤ 0.38 µm...≤ 1.6 µm (optionally electropolished)
- Available in all common connection sizes and variants
- Integrated locking
- Minimum and maximum stroke limitation
Technical Data
| Product Properties | Description |
|---|---|
| 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 |
| Tube valve body (VP) | Stainless steel tube 1.4435-BN2 / UNS S31603 (316L) according to DIN 11866, ASTM A269 / A270, DIN EN 10217-7 / 10216-5 |
| Cast valve body (VG) | Stainless steel precision casting 1.4435 / 316L |
| Plastic valve body | PVC-C, PVC-U, PP, PVDF |
| Diaphragm | EPDM (AD), PTFE/EPDM (EA), Advanced PTFE/EPDM (EU), laminate of GYLON® and EPDM (ER) |
| Actuator | Stainless steel/PPS (diaphragm bonnet/handwheel) |
| Diaphragm size | 15...50 |
| Medium Data | Description |
|---|---|
| Operating medium | Neutral gases and liquids, highly purified, sterile, aggressive or abrasive mediums |
| Medium temperature (EPDM) | -10...+143 °C (steam sterilisation +150 °C for 60 min) |
| Medium temperature (PTFE/EPDM) | -10...+130 °C (steam sterilisation +140 °C for 60 min) |
Ambient Temperature
The ambient temperature for the actuator (Stainless steel/PPS) is -10 to +130 °C (short-term up to +150 °C), and it is autoclavable.
Approvals and Conformities
- FDA: The diaphragms made of EPDM, PTFE/EPDM, Advanced PTFE/EPDM, and laminate of GYLON® and EPDM 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: The diaphragms are suitable for use with food and beverages.
- TA Luft: Technical instruction on air quality control (valid for the variable code PM01).
Explosion Protection (ATEX/IECEx)
Optional explosion protection is valid for the variable code PX51. As a category 2 device, it is suitable for zone 1/21 and zone 2/22.
- ATEX: EPS 18 ATEX 2 008 X II 2G Ex h IIC T4…T2 Gb / II 2D Ex h IIIC T135 °C…T300 °C Db
- IECEx: IECEx EPS 18.0007X Ex h IIC T4…T2 Gb / Ex h IIIC T135 °C…T300 °C Db
Materials
| 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 | EPDM, PTFE/EPDM, Advanced PTFE/EPDM, Laminate of GYLON® and EPDM |
Performance Specifications
Flow Characteristics (Forged Steel Valve Body VS)
| Diaphragm size [mm] | Port connection [inch] | Kv value water [m³/h] (DIN EN ISO 1127) | Kv value water [m³/h] (ASME BPE) |
|---|---|---|---|
| 15 | 1/2 | 6.5 | 3.1 |
| 20 | 3/4 | 12.5 | 8.4 |
| 25 | 1 | 18 | 15.5 |
| 40 | 1 1/2 | 41 | 37 |
| 50 | 2 | 66 | 66 |
Note on Flow Characteristics
The Kv values may vary slightly for different diaphragm materials. Measurement at +20 °C, 4 bar at valve inlet and 3 bar at valve outlet.
Maximum Permitted Medium Pressure
| Diaphragm size | Maximum static operating pressure [bar] | Tightening torque EPDM/FKM [Nm] | Tightening torque PTFE [Nm] |
|---|---|---|---|
| 15 | 10 | 0.8 | 1.7 |
| 20 | 10 | 0.9 | 3.0 |
| 25 | 10 | 1.2 | 3.5 |
| 32 | 10 | 2.5 | 4.0 |
| 40 | 10 | 4.5 | 7.0 |
| 50 | 10 | 6.0 | 11.0 |
Operation and Installation
Setting Minimum and Maximum Stroke Limits (Type 297x)
A minimum and maximum stroke limit can be set for Type 2973 (diaphragm sizes 15…50). The stroke limit is available as an option and is not integrated as standard. An adjusting sleeve is used for this purpose.
- 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. The square on the spindle and the hexagon head of the adjusting sleeve must be correctly aligned.
- 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.
Locking the Handwheel
For Type 2973 (diaphragm size 15…50), a locking mechanism is available as an option to prevent accidental or unauthorised operation.
- A handwheel (diaphragm size 15…25) can be locked in 12 locking positions per revolution.
- A handwheel (diaphragm size 32…50) can be locked in 13 locking positions per revolution.
Push the locking pin down and rotate by 180° (either clockwise or anticlockwise). It may be necessary to turn the handwheel slightly so that the locking pin reaches its end position. Insert a padlock through the bore in the locking pin and secure it.
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