Welch Vacuum Pump Complete Resource Center
New Pumps, Repair Kits, Parts, Filters, Oil, Manuals & Maintenance Resources
Everything you need to select, maintain, troubleshoot, and rebuild Welch vacuum pumps in one place.
Welch DuoSeal, ChemStar, and CRVpro pumps serve laboratories, universities, refrigeration service, freeze drying, vacuum ovens, filtration, distillation, manufacturing, and many other rough-vacuum applications.
Vacuum Pump Supply offers new Welch pumps along with OEM and OEM-equivalent repair kits, vanes, seals, gaskets, bearings, filters, oil, manuals, diagrams, and technical resources for both current and legacy models.
Need Help Identifying the Correct Welch Kit or Part?
Match the complete catalog number, model suffix, serial number, and pump configuration. For example, a 1397 and 1397PI can require different service parts. Include a clear nameplate photo and any known part numbers with your request.
Select Your Welch Vacuum Pump
Choose a featured model to shop exact repair parts or purchase a new pump.
DuoSeal Belt-Drive Vacuum Pumps
CRVpro Direct-Drive Vacuum Pumps
Welch Repair Parts Model Index
Select the exact model or pump family shown on your nameplate. Older supported models remain easy to reach without crowding the visual selector.
Shop Welch Pumps, Repair & Maintenance Products
New Welch Vacuum Pumps
Shop available Welch DuoSeal, ChemStar, CRVpro, refrigeration-service, and specialty vacuum pumps.
Repair Kits & Parts
Major and minor repair kits, gaskets, seals, vanes, bearings, valves, and pump-specific service components.
Replacement Filters
Exhaust filters, inlet filters, filter housings, traps, and related vacuum-system filtration products.
Vacuum Pump Oil & Fluids
Vacuum pump oils and service fluids for Welch belt-drive and direct-drive pumps. Confirm the correct fluid for the exact model and process.
New Welch ChemStar Pumps
Need chemical-duty performance? Shop the available Welch 1376 and 1402 ChemStar configurations.
Common Maintenance
- Vacuum Pump Oil Changes
- Shaft Seal or Packing Service
- Vane and Valve Replacement
- Belt Inspection and Adjustment
- Major and Minor Rebuilds
Common Problems
- Will Not Reach Ultimate Vacuum
- Oil Leaking at the Shaft
- Excessive Exhaust Mist or Smoke
- Pump Running Hot
- Unusual Noise or Belt Vibration
Technical Resources
Welch Manuals
Why Vacuum Pump Supply?
- Vacuum pump specialists since 2006
- Over 15,000 vacuum pump products
- New pumps plus repair and maintenance products
- OEM and OEM-equivalent solutions
- Technical help from vacuum pump specialists
Frequently Asked Questions
Which Welch vacuum pump families are covered here?
This center covers current and legacy Welch oil-sealed rotary vane pumps, including DuoSeal belt-drive, ChemStar chemical-duty, CRVpro direct-drive, and selected 8900-series models.
What is the difference between Welch DuoSeal and ChemStar pumps?
DuoSeal pumps are general-purpose two-stage belt-drive vacuum pumps. ChemStar models are configured for greater chemical resistance in demanding laboratory and process applications. Parts, seals, fluids, and service procedures are not automatically interchangeable.
Do you sell new Welch vacuum pumps?
Yes. Vacuum Pump Supply offers new Welch DuoSeal, ChemStar, CRVpro, refrigeration-service, and specialty pumps. Use the black Buy New Pump button on a featured model or browse the complete new-pump category.
How do I choose the correct Welch repair kit?
Use the complete model or catalog number, suffix, serial number, shaft seal or packing design, and production generation. A model number alone may not identify every required component. Send a clear nameplate photo when you need help confirming fitment.
Which oil should I use in my Welch pump?
The correct fluid depends on the exact pump family, process, temperature, seal materials, and current pump configuration. Consult the model manual or contact us before changing oil type, especially in chemical-duty applications.
Why is my Welch pump producing exhaust smoke or oil mist?
Common causes include overfilling, contaminated oil, excessive inlet load, worn internal components, or a missing or saturated exhaust-mist filter. Check the oil level and condition first, then inspect the pump and exhaust system.