PN25
BURKERT 20133778 is a pneumatically operated actuator assembly for the Type 2101 ELEMENT series 2/2-way globe valve. Engineered for DN15 nominal seat diameter bodies, it operates in control function A (normally closed by internal spring force) with the medium flow routed below the valve seat. The unit controls neutral gases, air, water, steam, alcohols, fuels, hydraulic fluids, saline solutions, and organic solvents across an operating pressure range of 0.00 to 25.00 bar(g) and fluid temperatures from -10 °C to +185 °C.
Equipped with a polyphenylene sulphide (PPS) actuator top, stainless steel internal drive casing, and a stainless steel swivel plate with a PTFE seat seal, this actuator assembly is CIP and SIP cleanable. It meets EC Regulation 1935/2004 and FDA requirements for contact with food and beverage products.
Structure and Operating Principle
Type 2101 consists of a pneumatically operated piston actuator coupled to a 2-way valve body. The mechanical thrust is transmitted from the internal piston through a stainless steel spindle directly to the swivel plate, ensuring tight shut-off at leakage rate A in accordance with DIN EN 12266-1.
In control function A (CF A), the valve is held closed in the rest position by integrated stainless steel springs. Pneumatic pilot pressure applied to pilot air port 1 acts on the actuator piston to open the valve against the spring force.
Directing the flow below the seat ensures reliable operation with liquid media by eliminating water hammer. Because process pressure acts underneath the swivel plate, the minimum required pilot pressure to achieve full opening on a DN15 orifice is 4.8 bar(g), up to a maximum pilot pressure limit of 10.0 bar(g).
Operating Restrictions on Flow Direction
Valves with medium flow above the seat must not be used for liquid media due to the severe hazard of line bursting from water hammer. BURKERT 20133778 is configured for flow below the valve seat, making it fully suitable for liquid and gaseous media.
Materials of Construction
BURKERT 20133778 utilizes high-grade materials to maintain structural stability and chemical resistance in demanding processing environments. The packing gland and internal guide components incorporate NSF H1 classified lubricants.
| Item | Component | Material |
|---|---|---|
| 1 | Ground terminal | Stainless steel 1.4301 / 1.4305 (ATEX variants) |
| 2 | Optical position indicator | Polysulfone (PSU) |
| 3 | Pilot air port | Polypropylene (PP) push-in connector |
| 4 | Actuator cover | Polyphenylene sulphide (PPS) |
| 5 | Actuator casing | Stainless steel 1.4561 (316Ti) |
| 6 | Piston seal | FKM |
| 7 | Spring assembly | Stainless steel 1.4310 |
| 8 | Spindle guide pipe | Stainless steel 1.4401 (316) / 1.4404 (316L) |
| 9 | Spindle packing | PTFE V-rings (filled), spring-compensated |
| 10 | Spindle | Stainless steel 1.4401 (316) / 1.4404 (316L) |
| 11 | Spindle guide | PEEK (DN 15 to DN 65) |
| 12 | Body seal | Graphite (PTFE optional) |
| 13 | Swivel plate | Stainless steel 1.4401 (316) / 1.4404 (316L) |
| 14 | Seat seal | PTFE |
| 15 | Valve seat with O-ring | Stainless steel 1.4571, EPDM |
| 16 | Valve body (reference) | Stainless steel 316L / CF3M |
Technical Data and Operating Limits
The operating envelope of Type 2101 valves is governed by the actuator size, temperature ratings, and standard pressure derating profiles.
| Technical Parameter | Specification Value |
|---|---|
| Orifice / Seat Diameter | DN 15 (15 mm) |
| Actuator Size | Ø 70 mm (Designation M, outer diameter A = 91 mm) |
| Actuator Height (H) | 250 mm on DN15 valve bodies |
| Max. Operating Pressure (CF A) | 25 bar(g) (water, steam, neutral gases) |
| Min. Pilot Pressure (CF A) | 4.8 bar(g) |
| Max. Pilot Pressure | 10.0 bar(g) |
| Pilot Air Connection | Push-in connector for hose Ø 6 mm or 1/4" |
| Medium Temperature Limits | -10 °C to +185 °C (PTFE seat seal) |
| Ambient Temperature Limits | -10 °C to +60 °C (with push-in pilot connectors) |
| Viscosity Capacity | Up to 600 mm²/s |
| Control Medium | Filtered compressed air, neutral gases |
Pressure Derating According to Standards
Operating pressure must be reduced at elevated fluid temperatures according to DIN EN 12516-1 (PN25 body rating):
| Temperature Range | Maximum Permissible Operating Pressure (PN25) |
|---|---|
| -10 °C to +50 °C | 25.0 bar(g) |
| +100 °C | 24.5 bar(g) |
| +150 °C | 22.4 bar(g) |
| +185 °C | 20.9 bar(g) (interpolated) |
| +200 °C | 20.3 bar(g) |
Installation and Mounting Guidelines
Installation must be carried out by qualified personnel using open-end wrenches. The valve can be oriented in any spatial position, though upright mounting with the actuator pointing upwards is preferred.
Actuator Disassembly Before Pipe Welding
For bodies with welded pipe connections, the actuator must be disassembled from the valve body before welding to avoid thermal destruction of seals and internal guides:
- Depressurize the piping and empty all process lines.
- Apply 5.0 bar compressed air to pilot port 1 so the valve moves to the open position.
- Unscrew the actuator from the valve body using an open-end wrench across the body interface.
- Weld the body into the piping system, allowing the metal to fully cool before re-installing the actuator.
Actuator Orientation Adjustment
The actuator housing can be rotated continuously by 360° counter-clockwise (viewed from below) to position the pilot ports and optical indicator conveniently. Keep the valve pressurized in the open position (5.0 bar at port 1) while rotating.
Tightening Torques for Assembly
During assembly or remounting onto the valve body, lubricate the external body thread with food-grade paste (such as Klüberpaste UH1 96-402) and observe strict torque values:
| Joint Location | Fastener / Connection | Tightening Torque |
|---|---|---|
| Body Connection | DN 15 Valve Body | 45 ± 3 Nm |
| Valve Seat Assembly | DN 15 Seat Thread | 20 ± 3 Nm |
| Spindle Guide Bushing | 10 mm Spindle (DN 15) | 6 Nm |
Maintenance and Wearing Part Replacement
Type 2101 actuators are maintenance-free under normal operating conditions. Regular visual inspections should check for tight seal interfaces and ensure no medium discharges through the relief inspection bore on the actuator neck.
Available Spare Part Sets
| Spare Part Kit | Orifice / Execution | Order Number |
|---|---|---|
| Valve Set (PTFE seal) | DN 15 (includes swivel plate, pin, seal) | 149 606 |
| Valve Seat Set | DN 15 (includes seat, seal, O-ring) | 262 152 |
| Packing Gland Seal Set | SP10 (DN 15–50, Ø 50 / Ø 70 mm actuators) | 216 433 |
| Valve Seat Assembly Tool | DN 15 Tool socket | 652 604 |
| Modified Socket Wrench | 10 mm Spindle (AF 19 mm) | 683 221 |
Replacing the Swivel Plate and Packing Gland
- Pressurize pilot port 1 with 5 bar air to open the valve, then unthread the actuator from the body.
- Secure the swivel plate cylindrical neck in a prism block. Drive out the retention pin using a 3 mm pin punch.
- Remove the worn swivel plate. Mount the replacement plate from kit 149 606, align the boreholes, insert the new pin, and caulk both borehole edges using a centre punch.
- When renewing the spindle packing, unscrew the spindle guide using modified socket wrench 683 221. Pressurize port 1 with 6 to 8 bar air to push the packing rings out from the tube onto a protected surface.
- Grease replacement chevron seals and rings from kit 216 433 with the supplied lubricant, slide them onto the spindle in order, and retighten the guide to 6 Nm.
Decentralised Automation and Control Heads
BURKERT 20133778 interfaces directly with modular Bürkert ELEMENT automation accessories:
- Type 8691 Control Head: Features non-contact inductive valve position detection, integrated pilot valves, high-visibility status LEDs, and AS-Interface or IO-Link connectivity.
- Type 8690 Pneumatic Control Unit: Provides mechanical or inductive limit switches for integrated end-position feedback.
- Type 8697 / Type 8695 Units: Compact position transmitters optimized for space-restricted plant layouts.
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