BECKER 90133400004 Ölfreie Drehschieber-Vakuumpumpe mit Kohlenstoffschaufeln

Produktname: Carbon vanes for Becker oil-free rotary vane vacuum pump (graphite vanes)

Internal Part No.: WN124-031

Grundlegende Spezifikationen

Abmessungen: 240 × 48 × 4 mm

Quantity per set: 4 pcs/set

Material: EK60 graphite (Genuine Becker carbon material, self-lubricating, dry oil-free type)

Compatible Pump Models

KVT 2.140

KVT 3.140

KDT 2.140

KDT 3.140

KL 1.140

Application Description

Applied to German Becker dry oil-free rotary vane vacuum pumps. It is a consumable part. After wear, symptoms such as insufficient vacuum, abnormal noise and reduced pumping flow will occur. Replace the whole set directly. Widely used in printing, suction handling, Verpackung, woodworking adsorption and other negative pressure applications.

Distinguish Similar Models (Avoid Wrong Purchase)

90133300004: WN124-032, compatible with KVT/KDT 2.100 / 3.100

90133000004: WN124-034, compatible with KDT2.80 / DVT3.60/3.80

Full Supplementary Data for BECKER 90133400004 (WN124-031)

Abmessungen: 240×48×4 mm, 4 pcs/set; Compatible with KVT2.140 / KVT3.140 / KDT2.140 / KDT3.140 / KL1.140; EK60 genuine graphite vanes for dry oil-free rotary vane pumps

1. Austauschverfahren (Werksstandard)
2. Isolate for Safety: Strom abschalten, apply LOTO lockout-tagout. Wait until the pump body is fully cooled and release internal pump chamber pressure. Wear clean oil-free gloves throughout the operation. Grease contamination on vanes will cause premature wear and carbon buildup jamming.
3. Disassemble End Cover: Remove the side cover of the pump head. Keep the sealing gasket properly (replace the gasket if damaged).
4. Take Out Old Vanes: Slide out old vanes gently. Do not pry forcibly; graphite vanes are brittle and easy to crack. Clean rotor slots, cylinder inner wall and graphite dust at exhaust ports. Wipe with lint-free cloth + wasserfreies Ethanol, blow off dust with dry oil-free compressed air.
5. Inspect Main Components

Rotor slots: Check for scratches, burrs and excessive clearance

Cylinder wall: Check for scratches and grooves. Once deep grooves form on the cylinder wall, new vanes will wear out rapidly again.

Lager: Check for play and abnormal noise. For KVT/KDT3.140, bearing grease replenishment cycle is 2000 Betriebsstunden.

5. Install New Vanes: Identify the chamfer direction. The chamfer shall face the forward rotation side. Reverse installation will lead to immediate vane fracture. Vanes shall slide freely in rotor slots without sticking. After installing all 4 vanes, turn the rotor manually for several revolutions to confirm no scraping or binding.
6. Reinstall Seal and End Cover: Place the gasket flat. Tighten bolts diagonally and evenly to avoid end cover deformation from unilateral stress.
7. Probelauf & Run-in: Run under no load for 15–30 minutes for run-in first, then connect to load. Monitor vacuum level, temperature rise and noise. Record ultimate vacuum and compare with nameplate parameters.

Reference maintenance interval: Inspect vanes every 3000 hours under normal dust conditions; inspect every 2000 hours for dusty applications such as printing and woodworking.

2. Installation & Betriebsverbote (Wichtige Punkte)

❌ Do not apply oil or grease. These are dry self-lubricating graphite vanes. Oil will block pores and damage self-lubricating property.

❌ Never strike vanes forcibly. Invisible cracks may form and cause pump damage after startup.

❌ Replace only 1–2 vanes. Replace all 4 vanes as a full set. Mismatched wear between old and new vanes causes vibration and unstable vacuum.

❌ Inhale dust directly without inlet filtration. Vane service life will be reduced by more than half. Replace inlet filter regularly.

✅ Lagerung: Keep dry and away from light. Graphite absorbs moisture and loses strength easily, leading to breakage.

3. Fehlerbehebung (Vane-Related Faults)

4. Domestic Alternative Selection Guide

Standard alternative specification: 240×48×4 mm graphite rotary vane, Becker EK60 formula compatible

Preferred domestic material: Impregnated graphite with EK60 equivalent formula (phenolic impregnated, hohe Temperaturbeständigkeit, low wear rate)

Alternative: General-purpose graphite vanes for vacuum pumps (Notiz: Many ordinary graphite vanes have insufficient porosity and flexural strength, service life is only 1/3~1/2 of OEM)

Key indicators for selection: Thickness tolerance ±0.02 mm, working surface Ra ≤0.8 μm, flexural strength ≥85 MPa

Risk warning: Low-cost non-standard vanes tend to shed powder, jam rotors and score cylinder barrels. The repair cost is far higher than the price difference of spare parts.

Remark for alternative order: WN124-031 / 240×48×4mm, compatible with KVT2.140/3.140

Suggestion for customs declaration: Mark as spare parts for dry rotary vane vacuum pump, material impregnated graphite, 4 pcs per set.

5. Incoming Inspection Checklist for Stock / Second-hand Parts
6. Dimensional sampling inspection: Measure length, width and thickness with caliper, confirm 240×48×4 mm; Dicke 4 mm is the critical sealing dimension.
7. Aussehen: No chipping, cracks or edge defects; uniform chamfer, no burrs.
8. Sliding test: Insert vane into matched rotor slot; it shall slide down freely vertically without jamming or excessive looseness.
9. Material check: Compare density with OEM sample. Clear sound when tapped; dull sound usually indicates excessive porosity.
10. Verpackung: Sealed moisture-proof bag to avoid moisture absorption.
11. Cross-Model Reference for Error Prevention

90133400004: WN124-031｜240×48×4｜KVT/KDT 2.140/3.140 (Current Item)

90133300004: WN124-032｜Compatible with KVT/KDT 2.100 / 3.100

90133000004: WN124-034｜Compatible with KDT2.80 / DVT3.60/3.80

Full List of BECKER Dry Vacuum Pump Carbon Vanes (Rotary Vanes)

Material: EK60 impregnated graphite, dry self-lubricating, NO OIL ALLOWED

Aktuelles Modell: 90133400004｜WN124-031

Series Group Introduction

1. KVT / KDT Medium & Kleiner Fluss (Mainstream for Printing & Saugen): WN124-031 / 032 / 033 / 034 (4 pcs per set, Ihre Zielserie)
2. VT / DT Small Single Pump: WN124-003, 120, 140, 161, 162 (7 pcs per set)
3. VTLF / DTLF Large Flow Oil-Free Blower: WN124-195, 196 (5 pcs per set, large size)
4. KVX / KDX Compressor Type: WN124-079, 252 (pressure rotary vanes)

General Purchasing & Acceptance Points

Replace all vanes of the same pump model with same batch parts, do not mix old and new vanes

Remark for domestic alternative order: WN124-XXX + Dimension + EK60 impregnated graphite

Working Principle of Oil-Free Rotary Vane Vacuum Pump (Dry Rotary Vane Pump, Becker KVT/KDT/VT Series)

Grundprinzip: Graphite rotary vanes are pressed against cylinder inner wall by centrifugal force, forming variable-volume chambers to complete gas suction → compression → exhaust. No lubricating oil inside pump chamber.

Main difference from oil-sealed rotary vane pump: Sealing and lubrication rely entirely on graphite vanes (EK60 impregnated graphite). No vacuum pump oil is injected into pump cavity.

Structure Components

Eccentric rotor: Installed inside cylinder, rotor center is offset from cylinder center

Rotary vanes (graphite carbon vanes): Fitted in radial slots of rotor and slide freely

Pump chamber (Zylinder), inlet port, Auslassöffnung, exhaust check valve

End covers, Lager (bearings are outside pump chamber with independent lubrication, isolated from process gas)

4-Stroke Working Cycle

1. Saugen

When rotor rotates, graphite vanes are thrown out by centrifugal force and cling tightly to cylinder wall. The sealed chamber enclosed by two adjacent vanes, rotor and cylinder wall expands, internal pressure drops. Air is drawn into the chamber through inlet port.

2. Isolierung

After vanes pass the inlet port, the chamber is disconnected from inlet and forms a closed gas compartment.

3. Compression

As rotor continues rotating, the volume of this closed chamber shrinks gradually due to eccentric structure, gas inside is compressed and pressure rises.

⚠️ Dry compression is adopted for oil-free pumps. No oil fills clearances, so ultimate vacuum is lower than oil-sealed rotary vane pumps of equivalent size, which is an inherent characteristic.

4. Auspuff

When gas pressure rises high enough to open the exhaust check valve, gas pushes the valve plate open and discharges from exhaust port. After vanes pass exhaust zone, they return to suction side and the cycle repeats.

Three Core Functions of Graphite Vanes (For Becker Pumps)

1. Versiegelung: Vane end surface fits cylinder wall to reduce backflow between high and low pressure chambers, determines vacuum performance.
2. Self-lubrication: Impregnated graphite features solid self-lubrication, prevents seizure under high-speed friction.
3. Wear Compensation: Graphite wears slowly and uniformly, still keeps contact with cylinder wall by centrifugal force until it wears below minimum thickness.

Hauptvorteile & Häufige Fallstricke

✅ Vorteile: Oil-free exhaust gas, suitable for suction applications in printing, Verpackung, food and electronics industries

❌ Einschränkungen:

Rotary vanes are consumables with continuous wear and require periodic replacement (z.B. 90133400004 mentioned above)

Poor tolerance to heavy dust and moisture; dust accelerates vane wear and cylinder scoring

Cannot inhale condensable oil vapor, which penetrates graphite pores, destroys self-lubrication and causes sticking or fracture

Bearings have independent lubrication, NO OIL INSIDE PUMP CHAMBER

Brief Comparison with Oil-Sealed Rotary Vane Pump

Oil-sealed rotary vane pump: Oil for sealing and lubrication, higher vacuum; exhaust contains oil mist

Oil-free graphite rotary vane pump: Graphite vanes for sealing and solid lubrication; clean exhaust, recurring consumable cost

Supplement for Becker KVT/KDT

It is a single-stage dry rotary vane vacuum pump, typical ultimate vacuum 100–200 mbar (varies by model), mainly used for negative pressure adsorption instead of high vacuum applications.

KVX/KDX series share the same structure principle but are designed for positive pressure service (dry air compressor).