Product Description
OEM-Equivalent Repair Kit with Vanes - Buna for Welch DuoSeal 1402 Vacuum Pumps - 1402K-47
OEM-Equivalent Welch DuoSeal Repair Kit
Part Number: 1402K-47
This OEM-equivalent Welch DuoSeal repair kit is supplied by Vacuum Pump Supply for service, repair, and maintenance of compatible Welch vacuum pumps. It is designed to help restore performance, reduce downtime, and support reliable pump operation.
Compatible Pump Models
Compatibility is based on the pump categories assigned to this product.
- Welch DuoSeal 1402
What's Included
- Vanes
- Shaft seals
- Gaskets and O-rings
- Valves
- Springs
- Washers and hardware
Complete Bill of Materials
The following components are included in this OEM-equivalent Welch DuoSeal kit.
| Part Number | Description | Qty |
|---|---|---|
| 410624 | Woodruff Key, Cut, Fisher Scientific, Welch | 2 |
| 310139 | Shaft Seal, Buna | 1 |
| 410992 | Pressure Relief Valve, Welch | 1 |
| 411304 | Spring | 6 |
| 411267 | Rubber Washer | 2 |
| 410613 | Woodruff Key, Cut, Welch, Duoseal | 2 |
| 412154 | Lower Exhaust Valve, Steel, Welch | 1 |
| 410710 | V-Belt, 1373, 1405 | 1 |
| 410696 | Spring Holder, Welch | 3 |
| 410959 | Welch Vane, 1st Stage - Cast Iron | 2 |
| 4401200 | Steel Ball, 1373, 1374 | 1 |
| 410508 | Thrust Washer- Welch, Duoseal | 1 |
| 590021 | Machined Housing, Welch, DirecTorr, 8915A, 8920A | 1 |
| 02120004 | O-ring, 6.1 x 1.6 mm - Buna | 1 |
| 411487 | Welch Vane, 2nd Stage - Cast Iron | 2 |
| 411266 | Washer, Tension | 2 |
| 412158 | Valve Spring, Welch, Duoseal, 1376N, 1376 | 2 |
| 4060754 | E-ring- Welch, Duoseal | 1 |
| 612231 | O-ring, Shaped ring - Viton | 2 |
| 619284A | O-ring, 24.99 x 3.53 mm - Viton | 1 |
| 619282A | O-ring, 7.65 x 1.78 mm - Viton | 1 |
| 310035 | Shaft Seal, Welch, DirecTorr | 1 |
| 400081 | SHCS,10-32 X 3/4 LG | 3 |
| 612159A | O-ring, 18.72 x 2.62 mm - Viton | 1 |
| 620118 | O-ring, Shaped, 11 mm ID X 14 mm OD - Viton | 2 |
| 02126025 | O-ring, 26.57 x 3.53 mm - Viton | 1 |
| 79135 | O-ring, 10.5 x 2 mm - Viton | 1 |
| 410403 | Case Gasket | 1 |
| 412291 | Gasket | 1 |
| 410234 | Gasket | 1 |
| 410643 | Shaft Seal Gasket, Fisher Scientific | 1 |
| 411766 | Disk Washer, Welch | 3 |
| 618456A | Washer, Copper, Welch, Duoseal | 6 |
Recommended Vacuum Pump Oil
Complete the Service with Fresh Oil
Fresh vacuum pump oil should be installed whenever servicing, resealing, or rebuilding a Welch DuoSeal pump. Contaminated oil can shorten the life of new seals, vanes, gaskets, and internal pump components.
- M68 Vacuum Pump Oil - Common mineral oil choice for Welch DuoSeal belt-drive vacuum pumps
- Ultragrade 19 Vacuum Pump Oil - OEM-style oil option for Welch DuoSeal pumps
- Vacuum Pump Oil Cross Reference Chart - Match OEM oil to VPS equivalents
Recommended Products
Why Buy from Vacuum Pump Supply?
- Vacuum pump specialists since 2006
- Over 15,000 vacuum pump parts and kits available
- OEM and OEM-equivalent options
- Fast shipping on stocked products
- Technical support from vacuum pump specialists
- Trusted by laboratories, universities, manufacturers, service companies, and maintenance teams
Helpful Resources
- Vacuum Pump Oil Cross Reference Chart
- Vacuum Pump Schematics, Manuals & Repair Resources
- Rotary Vane Vacuum Pump Repair Kits & Parts
- Welch Vacuum Pump Parts & Kits
- Vacuum Pump Oil
Frequently Asked Questions
Is this an OEM-equivalent product?
Yes. This is an OEM-equivalent Welch DuoSeal product supplied by Vacuum Pump Supply.
What pumps is this used on?
This product is listed for the compatible pump model categories shown above. Always confirm your pump model and part number before ordering.
Should I change the oil during service?
Yes. Fresh vacuum pump oil is recommended whenever a pump is serviced, resealed, or rebuilt.
