PN25
BURKERT 20122470 (Type 2961) is a manually operated 2-way globe control valve designed for excellent control accuracy under demanding operating conditions. It consists of a manual actuator and a globe valve body with exchangeable seats made of high-quality stainless steel. The precise spindle guide enables reliable control, while the soft PTFE seal guarantees tight shut-off. The actuator is made of high-quality plastic, features a visual position indicator, and can be optionally equipped with stroke limitation and locking.
Product Features
- Excellent control accuracy: Exchangeable valve seats enable perfect coordination under the most demanding operating conditions.
- Robust actuator: Features optional stroke limitation and locking.
- High-quality materials: Stainless steel valve body with flange connection (DN 80).
- Reliable sealing: The packing gland uses tried-and-tested V-seals and possesses spring compensation, eliminating the need for manual retightening.
Approvals and Conformities
- Pressure Equipment Directive: 2014/68/EU
- Explosion Protection (Optional): ATEX / IECEx Category 2 device suitable for zone 1/21 and zone 2/22.
- Drinking Water: Suitable for use in drinking water applications (UBA).
- Foods and Beverages/Hygiene: FDA, USP, EC Regulation 1935/2004, China food GB Standards.
Materials
| No. | Element | Material |
|---|---|---|
| 1 | Cover | Polyamide (PA) |
| 2 | Screw | Stainless steel 1.4301 |
| 3 | Locking device | Stainless steel 1.4305 |
| 4 | Handwheel | Polyphenylene sulphide (PPS) |
| 5 | Visual position indicator with scale | Polyamide (PA) |
| 6 | Packing gland | PTFE V-rings (filled), with spring compensation |
| 7 | Stem | Stainless steel 1.4401 or 1.4404 |
| 8 | Spindle guide | Stainless steel 1.4404 (316L), PTFE filled |
| 9 | Housing seal | Graphite |
| 10 | Control cone | 1.4571 (optionally hardened) |
| 11 | Seat seal | PTFE or PEEK |
| 12 | Valve seat with O-ring | Stainless steel 1.4571, EPDM |
| 13 | Valve body | Stainless steel 316L/CF3M |
Dimensions
Actuator
| Nominal connection size (pipe) DN | NPS | Handwheel diameter ∅ [mm] | H1 [mm] | H2 (locking) [mm] |
|---|---|---|---|---|
| 15 | 1/2 | 45 (S) | 217 | 224 |
| 20 | 3/4 | 45 (S) | 224 | 230 |
| 25 | 1 | 45 (S) | 228 | 234 |
| 32 | 1 1/4 | 110 (M) | 296 | 303 |
| 40 | 1 1/2 | 110 (M) | 301 | 307 |
| 50 | 2 | 110 (M) | 307 | 313 |
| 65 | 2 1/2 | 160 (L) | 361 | 368 |
| 80 | 3 | 160 (L) | 369 | 375 |
| 100 | 4 | 160 (L) | 379 | 385 |
Operating Limits
Pressure and temperature restriction (derating) of the valve body (DIN EN 12516-1/PN25):
| Temperature [°C] | Operating pressure [bar] |
|---|---|
| -10...+50 | 25 |
| 100 | 24.5 |
| 150 | 22.4 |
| 200 | 20.3 |
| 230 | 19 |
Installation and Operation
Position Indicator
When turning the handwheel anticlockwise, the reproducible stroke scale becomes visible between the position indicator and the handwheel. The scale on the handwheel determines the rotation position of the handwheel (50 positions).
Flow Direction
The valve seat is always closed against the medium flow. The flow direction should therefore be set such that the valve reaches the flow beneath the valve seat.
Set Stroke Limit (Optional)
Both the minimum and the maximum position of the valve can be adjusted via an adjustment sleeve. The handwheel can be removed for this purpose.
Lock Handwheel (Optional)
The valve can be secured against unintentional or unauthorized operation. A securing pin can be pressed down and turned. The locking pin has a hole (∅ 3.8) and can be secured with a padlock.
Safety Instructions
Explosion Hazard (For Ex variants)
- Installation, operation and maintenance may only be performed by qualified technicians using appropriate tools.
- Only operate the device if it is in perfect condition and in accordance with the operating instructions.
- Do not subject the device to mechanical and/or thermal stresses that exceed the limits specified.
- Take appropriate measures to ensure that no electrostatic charge can build up in the potentially explosive area.
Risk of injury due to high pressure and escaping medium
- Switch off the pressure before working on the device or system. Vent or drain the lines.
- Do not exceed the maximum medium pressure. Observe specifications on the type label.
Risk of crushing by mechanically powered parts
- The upwards and downwards movement of the device means there is a risk of crushing.
- Do not reach into the openings of the valve body.
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