PN25
BURKERT 329864 (Type 2100) is a pneumatically operated 2/2-way angle seat valve from the ELEMENT platform designed for decentralized process automation. Configured in control function A (normally closed by spring force), this valve variant features a nominal diameter of DN 50, G 2 female threaded process connections according to DIN ISO 228-1, and an integrated Ø 90 mm (actuator size N) pneumatic actuator. Engineered for flow direction above the seat, it provides tight shut-off up to 16 bar(g) for steam and gaseous media with a Kv flow factor of 55 m³/h. The wetted body is precision-cast stainless steel CF3M (equivalent to 316L), paired with a PTFE seat seal and a spring-compensated self-adjusting PTFE V-ring packing gland that provides maintenance-free stem sealing. Wetted components comply with European food contact regulation (EC) 1935/2004, and the actuator lubricants are certified according to NSF H1.
Water Hammer Hazard with Flow Above Seat
Valves with flow direction above the seat close with the medium flow. In the case of liquid media, rapid valve closure produces severe hydraulic water hammer that can burst pipelines and equipment. Do not use valves configured with flow above the seat for liquid media. This valve variant must only be operated with compressible fluids, specifically steam, gases, and vapours.
Technical Data & Operating Specifications
BURKERT 329864 satisfies pressure equipment design standards according to DIN EN 1333 (PN 25) and DIN EN 1759 (Class 150). Operating parameters must remain within the limits defined for temperature, pilot pressure, and media characteristics.
| Specification Parameter | Value |
|---|---|
| Article Number | 329864 |
| Type / Series | Type 2100 ELEMENT |
| Circuit Function | CF A (2/2-way, normally closed by spring force) |
| Flow Direction | Above seat (Flow to close, for steam and gases) |
| Port Size / Seat Diameter | DN 50 / 50 mm |
| Process Connection | Internal thread G 2 (DIN ISO 228-1) |
| Installation Face-to-Face Length | 150 mm |
| Flow Factor Kv (Water at +20 °C) | 55 m³/h |
| Maximum Operating Pressure | 16 bar(g) (0 to 16 bar) |
| Maximum Medium Temperature | -10 °C to +185 °C |
| Permissible Ambient Temperature | -10 °C to +100 °C |
| Maximum Viscosity | 600 mm²/s |
| Pilot Control Fluid | Filtered compressed air, neutral gases |
| Pilot Pressure Range | 2.5 bar(g) to 10 bar(g) |
| Pilot Air Connection | G 1/8 female thread |
| Seat Leakage Class | Leakage rate A (DIN EN 12266-1) |
| Actuator Size | Ø 90 mm (N) |
| Protection Class | IP65 / IP67 according to EN 60529, NEMA 4X |
| Cleanability & Sterilization | CIP capable, SIP capable |
| Conformity | Regulation (EC) 1935/2004, 2014/68/EU (PED), 2006/42/EC (MD) |
Materials of Construction
All wetted and non-wetted materials are selected for chemical compatibility, hygienic cleaning resistance, and mechanical endurance in automated process environments.
| Item No. | Component | Material |
|---|---|---|
| 1 | Ground terminal (optional / ATEX) | Stainless steel 1.4301 / 1.4305 |
| 2 | Optical position indicator | Polysulfone (PSU) |
| 3 | Pilot air port | G 1/8 thread, Stainless steel 1.4305 |
| 4 | Actuator cover | Polyphenylene sulphide (PPS) |
| 5 | Actuator casing | Stainless steel 1.4561 (316Ti) |
| 6 | Piston seal | Fluoroelastomer (FKM) |
| 7 | Spring | Stainless steel 1.4310 |
| 8 | Actuator pipe | Stainless steel 1.4401 (316) / 1.4404 (316L) |
| 9 | Packing gland | Filled PTFE V-rings, spring-compensated |
| 10 | Spindle | Stainless steel 1.4401 (316) / 1.4404 (316L) |
| 11 | Spindle guide | Polyether ether ketone (PEEK) |
| 12 | Body seal | Graphite (PTFE optional) |
| 13 | Swivel plate | Stainless steel 1.4401 (316) / 1.4404 (316L) |
| 14 | Seat seal | PTFE (Polytetrafluoroethylene) |
| 15 | Valve body | Stainless steel CF3M (cast 316L) |
Dimensions and Weights
The envelope dimensions for the DN 50 valve body with G 2 female threads and the Ø 90 mm actuator are illustrated below.
| Dimension Identifier | Description | Nominal Dimension (DN 50, G 2) |
|---|---|---|
| LM | Face-to-face body length | 150 mm |
| E | Thread engagement depth (G 2) | 24 mm |
| AF | Body wrench flat width | 70 mm |
| CM | Centerline to port face distance | 45 mm |
| Ø A | Actuator outer diameter (Size 90 N) | 120 mm |
| B | Overall height to indicator dome | 262 mm (maximum) |
| H | Height to actuator connection | 261 mm (maximum) |
| K / M | Clearance height above port axis | 236 mm (maximum) |
| B / H (with Type 8690 / 8697) | Overall height with control unit | 313 mm |
| B / H (with Type 8691 / 8695) | Overall height with control head | 337 mm |
Operating Principle and Pilot Control
BURKERT 329864 operates with flow entering above the valve seat. Because the process medium is present above the swivel plate, the line operating pressure assists the actuator spring in forcing the swivel plate down onto the valve seat. This configuration enhances seat sealing performance under pressure. The valve opens when pilot pressure is applied to pilot air port 1, lifting the piston and spindle against the spring force.
Pilot air pressure must be maintained in relation to operating pressure. For DN 50 with the Ø 90 mm actuator, the minimum required pilot pressure increases as operating pressure rises up to 16 bar(g). Maximum allowable pilot pressure is 10 bar(g). Compressed air supplied to the pilot port must be dry, non-lubricated, or lubricated instrument air.
Installation and Actuator Orientation
Installation requires clean, aligned pipelines free of debris and foreign particulate matter. The valve may be mounted in any orientation, though an upright actuator orientation is preferred to minimize particle sedimentation inside the actuator bonnet.
| Nominal Diameter | Actuator Size | Body Connection Torque [Nm] | Tolerance [Nm] |
|---|---|---|---|
| DN 50 | 90 (N) | 70 Nm | +10 / -5 Nm |
Actuator 360° Alignment Procedure
The actuator connection allows stepless 360° orientation so that pneumatic and electrical ports can be aligned to plant cabling and tubing runs:
- Clamp the valve body securely in a vice or holding fixture.
- Apply 5 bar compressed air to pilot port 1 to open the valve fully. The valve must be in the open position during turning to prevent seal damage.
- Place an open-end wrench on the hexagon nut of the body connection to hold it stationary.
- Apply a second open-end wrench to the drive connection hexagon nut and turn the actuator clockwise to the required angle.
Maintenance, Inspection, and Troubleshooting
Regular visual inspection verifies system tightness and mechanical integrity during operational cycles.
| Inspection Point | Observed Condition | Corrective Action |
|---|---|---|
| 1. Media Connectors | External leak at pipeline thread | Check thread sealant, retighten connection |
| 2. Relief Bore | Medium escape at actuator neck | Replace packing gland or complete actuator |
| 3. Swivel Plate / Seat | Internal leakage past closed seat | Replace swivel plate assembly with PTFE seat seal |
Troubleshooting Matrix
| Symptom | Probable Cause | Remedial Action |
|---|---|---|
| Actuator does not switch | Pilot air port inverted | Connect pilot supply line to pilot port 1 |
| Actuator does not switch | Pilot pressure insufficient | Verify pilot pressure meets minimum curve (up to 10 bar) |
| Actuator does not switch | Operating pressure too high | Ensure process line pressure does not exceed 16 bar(g) |
| Actuator does not switch | Inverted pipeline flow | Align valve flow with arrow marking (flow above seat) |
| Valve seat leaks | Particulate caught on seat | Flush line, install an upstream strainer/dirt trap |
| Valve seat leaks | Seat seal damaged or worn | Replace swivel plate seal assembly |
| Leakage at relief bore | Spindle packing gland worn | Replace packing gland set using installation socket tool |
Service Tooling for Packing Gland
Replacing the spindle packing gland requires the specialized Bürkert socket tool. For spindle diameter 10 mm (DN 15 to DN 50), use tool width across flats 19 mm, article number 683221. For spindle diameter 14 mm (DN 32 to DN 80), use tool width across flats 21 mm, article number 683223.
Automation Interfaces and Accessories
BURKERT 329864 integrates directly with ELEMENT modular automation accessories to create pre-tested decentralized automation units (Type 8801-YE valve systems):
- Type 8690: Pneumatic control unit with mechanical or inductive position feedback switches and integrated pilot valve.
- Type 8691: Control head with contact-free inductive position sensor, high-visibility status LEDs, teach-in function, and bus interfaces (AS-Interface, IO-Link, büS).
- Type 8695: Compact control head optimized for integrated installation with optical status indication.
- Type 8697: Compact pneumatic feedback unit with mechanical/inductive switches and optional ATEX/IECEx intrinsic safety approvals.
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