PN25
BURKERT 336909 Type 2106 is a pneumatically operated 3/2-way seat valve ELEMENT designed for decentralized automation. It consists of a pneumatically operated ELEMENT actuator and a 3-way stainless steel valve body. Interchanging of pressure and service ports enables different fluidic circuit functions, such as the mixing or distributing of mediums.
The flow-optimized valve body of Type 2106 allows excellent flow rates. The tried and tested self-adjusting gland secures a high level of tightness and ensures reliable operation over years. The directly connected control head and actuator provide a compact and smooth design, integrated pneumatic lines, protection class IP65/67, NEMA Type 4X, and high chemical resistance.
General Technical Data
| Property | Description |
|---|---|
| Body Material | Cast stainless steel 316L |
| Actuator Material | PPS |
| Seal Material | PTFE |
| Cover Material | Stainless steel 1.4561 (316Ti) |
| Spindle Packing | PTFE seal with spring compensation |
| Nominal Diameter | DN 15...DN 50, NPS 1/2...NPS 2 |
| Nominal Pressure | PN 16 (body) |
| Pilot Pressure | Max. 10 bar(g), actuator size Ø 130 mm, 7 bar(g) |
| Medium | Steam, water, neutral gases, alcohols, oils, fuels, hydraulic fluids, salt solutions, alkalis, organic solvents, oxygen and fuel gases |
| Medium Temperature | -10 °C...+185 °C |
| Viscosity | Max. 600 mm²/s |
| Control Medium | Air, neutral gases |
| Threaded Connection | G (DIN ISO 228 - 1), NPT (ASME B1.20.1) |
| Ambient Temperature | -10 °C...+60 °C (integrated control unit), -10 °C...+100 °C (push-in air ports) |
| Installation Position | As required, preferably with actuator in upright position |
Control Functions
| Symbol | Description |
|---|---|
 | Control function C (CF C) Pneumatically operated 3/2-way process valve. When de-energised, pressure port 1 closed, service port 2 exhausted. |
 | Control function D (CF D) Pneumatically operated 3/2-way process valve. When de-energised, pressure port 3 connected to service port 2, exhaust port 1 closed. |
 | Control function E (CF E) Pneumatically operated 3/2-way mixer valve. When de-energised, pressure port 3 connected to service port 2, pressure port 1 closed. |
| (No image) | Control function F (CF F) Pneumatically operated 3/2-way distributor valve. When de-energised, pressure port 2 connected to service port 3, service port 1 closed. |
Approvals and Conformities
- Conformity: Pressure Equipment Directive 2014/68/EU, Machinery Directive 2006/42/EC.
- Explosion Protection: 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 EPS 18.0007X.
- Drinking Water: Suitable for use in drinking water applications (UBA). PF39: Suitable for products with medium temperature up to 85 °C (hot water).
- Foods and Beverages/Hygiene: FDA Code of Federal Regulations, EC Regulation 1935/2004, China food GB Standards.
- Others: DNV GL classification, Suitability for oxygen, Fuel gases (Regulation EU 2016/426, DVGW DIN EN 161, DIN EN 16678).
Materials
Note
The lubricants for packing gland and actuator are classified according to NSF H1.
| No. | Element | Material |
|---|---|---|
| 1 | Transparent cap | Polysulfone PSU |
| 2 | Pilot air ports | Push-in connector PP (standard) |
| 3 | Actuator cover | PPS |
| 4 | Actuator casing | Stainless steel 1.4561 (316Ti) |
| 5 | Piston seal | FKM |
| 6 | Spring | Stainless steel 1.4310 |
| 7 | Tube | Stainless steel 1.4401 (316)/1.4404 (316L) |
| 8 | Packing gland | PTFE |
| 9 | Spindle | Stainless steel 1.4401 (316)/1.4404 (316L) |
| 10 | Spindle guide | PEEK |
| 11 | Valve body | Stainless steel 1.4404 (316L) |
| 12 | Body closer | Stainless steel 1.4404 (316L) |
| 13 | Seal | PTFE |
| 14 | Seat nipple | Stainless steel 1.4404 (316L) |
Dimensions
(Dimensions in mm, unless otherwise stated. Push-in connector for plastic tubing 6/4 mm or G1/8 connection.)
Performance Specifications
Pilot Pressure Diagrams
Actuator size Ø 50 mm (Maximum control pressure 10 bar(g))
Actuator size Ø 70 mm (Maximum control pressure 10 bar(g))
Explosion Protection (ATEX) Guidelines
When using the device in potentially explosive areas (Zones 1/21 and 2/22), the following special conditions apply:
Explosion Hazard due to Electrostatic Charge!
If statically charged devices or persons discharge suddenly, there is a risk of explosion in the potentially explosive area.
- Take appropriate measures to ensure that no electrostatic charge can build up in the potentially explosive area.
- Only wipe the surface of the device gently with a damp or anti-static cloth.
- Ground the actuator and valve body.
- If a plastic valve body is used, ground the actuator separately.
Temperature Classes:
| Temperature Class | T2 | T3 | T4 |
|---|---|---|---|
| Permissible Surface Temp | 300 °C | 200 °C | 135 °C |
| Ambient Temperature | -40 to 130 °C | -40 to 130 °C | -40 to 100 °C |
| Max Medium Temperature | 285 °C | 185 °C | 125 °C |
Device Grounding:
- Ground the valve body using a conductive connection to the piping system.
- Exposed metal parts not integrated into the valve potential equalization (PA) must be included in the PA by the customer.
- Conductive parts must be grounded separately. Install a grounding strap clip or grounding terminal as shown below.
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