PN25
BURKERT 20033286 (Type 2101) is a pneumatically operated 2/2-way globe valve actuator and internal trim assembly configured for decentralised process automation. Designed for installation on DN 20 globe valve bodies, this unit operates with Control Function A (normally closed by internal spring force) and directs flow below the seat, preventing water hammer in fluid service. The operating pressure spans from 0 bar(g) to 25 bar(g), demanding a minimum pilot pressure of 4.8 bar(g) and a maximum pilot pressure of 10 bar(g). The integrated trim delivers a water flow coefficient Kv of 8.1 m³/h.
Constructed with an impact-resistant polyphenylene sulphide (PPS) actuator housing and stainless steel internal components, the assembly handles medium temperatures between -10 °C and +185 °C and ambient operating conditions from -10 °C to +100 °C. The valve trim incorporates a swivel plate made of 1.4401/1.4404 stainless steel fitted with a virgin PTFE seat seal, achieving seat leakage rate A per DIN EN 12266-1. The spindle sealing system employs self-adjusting PTFE V-rings preloaded by spring compensation, providing maintenance-free stem sealing under continuous cycling. All wetted materials comply with Regulation (EC) No 1935/2004 for food contact, and the entire unit is rated for Clean-in-Place (CIP) and Sterilisation-in-Place (SIP) thermal regimes.
Technical Specifications and Operating Parameters
BURKERT 20033286 integrates pneumatic actuation with precision flow isolation. The unit connects pneumatically through an ELEMENT push-in interface for 6 mm tubing and provides ingress protection to IP65/IP67 and NEMA Type 4X.
| Technical Parameter | Specification / Certified Value |
|---|---|
| Article Number (MPN) | 20033286 |
| Valve Type Family | Type 2101 ELEMENT |
| Construction Type | Actuator for 2/2-way globe valve (trim included) |
| Nominal Diameter | DN 20 (NPS 3/4") |
| Seat Diameter | 20 mm |
| Actuator Size | Ø 70 mm (Size M) |
| Actuator Material | Polyphenylene sulphide (PPS) |
| Control Function | Control Function A (normally closed, CFA) |
| Flow Direction | Below seat (closing against media flow) |
| Flow Coefficient (Kv water) | 8.1 m³/h |
| Operating Pressure Range | 0 bar(g) to 25 bar(g) |
| Minimum Pilot Pressure | 4.8 bar(g) |
| Maximum Pilot Pressure | 10 bar(g) |
| Medium Temperature Range | -10 °C to +185 °C |
| Ambient Temperature Range | -10 °C to +100 °C |
| Seat Seal Material | PTFE (Polytetrafluoroethylene) |
| Swivel Plate Material | Stainless steel 1.4401 / 1.4404 (316 / 316L) |
| Spindle Seal | Self-adjusting PTFE V-rings with spring compensation |
| Spindle Guide Material | PEEK (polyetheretherketone) |
| Pilot Air Interface | Push-in connector Ø 6 mm (G 1/8 stainless steel optional) |
| Operating Media | Steam, water, neutral gases, alcohols, oils, fuels, solvents |
| Hygiene Conformity | Regulation (EC) No 1935/2004 declaration |
| CIP / SIP Capability | Yes (steam sterilization tested) |
| Protection Class | IP65 / IP67 according to IEC 529 / EN 60529 (NEMA 4X) |
Design Structure and Materials of Construction
BURKERT 20033286 consists of a pneumatic piston actuator mounted directly to the valve bonnet tube and spindle assembly. The internal return springs maintain tight valve closure against the seat until pilot air pressurises the cylinder chamber.
| Item | Component Description | Material Specification |
|---|---|---|
| 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 Ø 6 mm |
| 4 | Actuator cover | Polyphenylene sulphide (PPS) |
| 5 | Actuator casing | Stainless steel 1.4561 (316Ti) / PPS |
| 6 | Piston seal | Fluoroelastomer (FKM) |
| 7 | Return spring pack | Stainless steel 1.4310 |
| 8 | Bonnet pipe | Stainless steel 1.4401 (316) / 1.4404 (316L) |
| 9 | Spindle packing gland | Filled PTFE V-rings with spring compensation |
| 10 | Actuator spindle | Stainless steel 1.4401 (316) / 1.4404 (316L) |
| 11 | Spindle guide | PEEK (polyetheretherketone) |
| 12 | Valve body seal | Graphite (PTFE optional) |
| 13 | Swivel plate | Stainless steel 1.4401 (316) / 1.4404 (316L) |
| 14 | Seat seal | Virgin PTFE (Polytetrafluoroethylene) |
| 15 | Valve seat with O-ring | Stainless steel 1.4571 with EPDM seal |
| 16 | Valve body (matching) | Stainless steel 316L / CF3M |
Lubricant Safety
All factory lubricants applied to the spindle packing gland and actuator piston cylinder are classified according to NSF H1 for food and pharmaceutical applications.
Control Function and Flow Characteristics
BURKERT 20033286 operates exclusively with Control Function A (CFA). In the de-energised rest position, internal preloaded springs force the spindle and swivel plate down onto the orifice seat. Applying pilot pressure of at least 4.8 bar(g) through pilot air port 1 overcomes spring tension and opens the valve.
The flow path enters beneath the seat and discharges through the lateral port. Because process pressure acts directly on the bottom face of the swivel plate, it assists the actuator during opening. Closing against the direction of fluid flow prevents line pressure shock waves and eliminates water hammer in liquid transport systems.
Pressure and Water Hammer Restrictions
Liquid media must strictly be operated with flow direction below the seat. Operating liquid streams with flow direction above the seat generates acute water hammer that can burst piping and fracture valve components. Ensure minimum pilot pressure of 4.8 bar(g) is maintained; inadequate control pressure under maximum line pressure (up to 25 bar) can prevent complete valve stroke.
Pressure and Temperature Operating Limits
Thermal conditions influence the permissible line pressure according to international pressure vessel standards. For stainless steel valve bodies paired with the 20033286 actuator group, the maximum mechanical pressure rating derates across operating temperatures.
| Operating Temperature | DIN EN 12516-1 (PN25 Body) | ASME B16.5 / B16.34 Cl. 150 | JIS B 2220 10K Flange |
|---|---|---|---|
| -10 °C to +50 °C | 25.0 bar(g) | 18.4 bar(g) | 14.0 bar(g) |
| +100 °C | 24.5 bar(g) | 16.2 bar(g) | 14.0 bar(g) |
| +150 °C | 22.4 bar(g) | 14.8 bar(g) | 13.4 bar(g) |
| +185 °C (Upper Limit) | 20.8 bar(g) | 14.0 bar(g) | 12.7 bar(g) |
| +200 °C (Steam Limit) | 20.3 bar(g) | 13.7 bar(g) | 12.4 bar(g) |
Ambient Temperature Boundaries
When fitted with push-in pilot air connectors, ambient temperature must remain between -10 °C and +60 °C. Ambient exposure up to +100 °C requires threaded pilot air connections or high-temperature lines. If an electrical pilot solenoid valve is installed directly on the actuator, the maximum ambient temperature is limited to +55 °C.
Installation, Valve Body Connection, and Actuator Alignment
The valve assembly mounts in any spatial orientation, though an upright vertical position is recommended to minimize particulate settling inside the bonnet. When welding a body into a process pipeline, always uncouple the actuator and remove the internal trim to protect soft seals from excessive heat.
Mandatory Valve Position During Servicing
Before disassembling or screwing the actuator into the valve body, supply compressed air at 5.0 bar(g) to pilot port 1 to fully open the valve. Attempting to rotate or torque the actuator while closed presses the swivel plate against the seat contour, permanently shearing or distorting the PTFE sealing ring.
Connecting ports can be aligned across a continuous 360° circle by turning the actuator counterclockwise relative to the valve body.
Body connection threads must be greased with food-grade paste (Klüberpaste UH1 96-402) and torqued using an open-end wrench according to the nominal port dimension.
| Valve Body Connection Size | Body Connection Tightening Torque [Nm] |
|---|---|
| DN 15 | 45 ± 3 |
| DN 20 (Model 20033286) | 50 ± 3 |
| DN 25 | 60 ± 3 |
| DN 32 | 65 ± 3 |
| DN 40 | 65 ± 3 |
| DN 50 | 70 ± 3 |
| DN 65 | 100 ± 3 |
| DN 80 | 120 ± 5 |
| DN 100 | 150 ± 5 |
Maintenance, Tightening Torques, and Spare Parts
Under normal industrial conditions, the PPS piston actuator requires no internal relubrication. Routine maintenance focuses on inspecting the relief bore on the bonnet tube for leakage. Any media egress at the relief bore indicates packing gland wear, requiring replacement of the internal seal set.
Replacement Procedure and Tightening Torques
- Disconnect line pressure and exhaust pilot pressure completely before beginning disassembly.
- Apply 5.0 bar(g) pilot pressure to port 1 to raise the swivel plate off the valve seat.
- Unscrew the actuator from the valve body using an open-end wrench.
- Drive out the cylindrical retaining pin using a 3 mm pin punch (for 10 mm spindle diameter) to release the swivel plate.
- Unscrew the internal spindle guide using modified socket wrench 683 221 (AF 19) and extract worn packing components.
- Assemble the replacement chevron packing stack in the exact sequence: support ring, chevron seals, thrust collars, and compression spring, applying the supplied NSF H1 lubricant.
- Tighten the spindle guide to 6 Nm for 10 mm diameter spindles (15 Nm for 14 mm spindles; 60 Nm for 22 mm spindles).
- Fit the new swivel plate, drive the retaining pin through aligned holes, and secure the pin ends by caulking both sides with a centre punch.
| Servicing Element | Valve Seat / Orifice Size | Tightening Torque [Nm] |
|---|---|---|
| Valve seat thread (greased) | DN 15 | 20 ± 3 |
| Valve seat thread (greased) | DN 20 | 28 ± 3 |
| Valve seat thread (greased) | DN 25 | 40 ± 5 |
| Valve seat thread (greased) | DN 32 | 65 ± 5 |
| Valve seat thread (greased) | DN 40 | 85 ± 8 |
| Valve seat thread (greased) | DN 50 | 120 ± 8 |
| Valve seat thread (greased) | DN 65 | 150 + 10 |
| Valve seat thread (greased) | DN 80 | 180 + 10 |
| Valve seat thread (greased) | DN 100 | 220 + 10 |
Spare Part Sets and Dedicated Service Tooling
| Item Description | Target Component / Application | Order Number (MPN) |
|---|---|---|
| Valve Set DN 20 | Swivel plate with PTFE seat seal, retaining pin, body seal | 011 171 |
| Packing Gland Seal Set | Standard variant for actuator Ø 50 / Ø 70 mm (DN 15–50) | 216 433 |
| Packing Gland Seal Set | High-temperature variant up to +230 °C (Ø 50 / Ø 70 mm) | 372 662 |
| Packing Gland Seal Set | Hot water variant up to +200 °C (Ø 50 / Ø 70 mm) | 372 661 |
| Valve Seat Set DN 20 | Stainless steel orifice seat, O-ring, flat seal | 262 157 |
| Valve Seat Assembly Tool | Specialized socket bit for DN 20 valve seat | 652 605 |
| Modified Socket Wrench | AF 19 socket for DN 15–50 spindle guide (spindle Ø 10 mm) | 683 221 |
Automation Integration and Decentralised Control Heads
BURKERT 20033286 is mechanically matched to the ELEMENT decentralised automation concept. The actuator top interface accepts direct plug-and-play mounting of electrical position feedback units and microprocessor-controlled pneumatic heads, forming complete ELEMENT Type 8801-GC on/off systems:
- Type 8691 Control Head (Actuator Ø 70 mm): Features an inductive, non-contact continuous position sensor, integrated pilot solenoid valve, high-visibility colored LEDs, and automatic end-position initialization via an onboard Teach function. Supports AS-Interface, IO-Link, and büS.
- Type 8690 Pneumatic Control Unit (Actuator Ø 70 mm): Offers integrated pneumatic pilot valves with mechanical or inductive end-position limit switches for compact process control cabinets.
- Type 6012 / 6014 P Solenoid Pilot Valves: Provide direct banjo-style mounting on the actuator pilot port for straightforward electrical actuation.
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