Product Description
Welch CRVpro 65 Two-Stage Rotary Vane Vacuum Pump
Welch part number: 3657T-01
Factory configuration: 240–265/415–460 V / 60 Hz / 3-phase
Overview
The Welch CRVpro 65 is a two-stage, oil-sealed direct-drive rotary-vane vacuum pump for laboratory, research and industrial service. The CRVpro design combines gas ballast, forced oil lubrication, anti-suckback protection and a large oil reservoir in a compact package.
| Free-air displacement | Ultimate pressure | Pump design | Oil capacity |
|---|---|---|---|
| 52.5 cfm / 1487 L/min | 0.002 Torr | Two-stage direct drive | 4.3 L |
Configuration
| Field | This product |
|---|---|
| Welch part number | 3657T-01 |
| Model | CRVpro 65 |
| Electrical / factory configuration | 240–265/415–460 V / 60 Hz / 3-phase |
| Purchase status | Call for Pricing |
Electrical-installation note: Conduit wiring is required. Have a qualified electrician confirm voltage, motor protection, classification and local code requirements.
Features
- Two-stage direct-drive rotary-vane design provides deep vacuum in a compact footprint.
- Forced oil lubrication supports stable operation and dependable pump-module protection.
- Built-in anti-suckback protection helps prevent oil migration after power loss.
- Gas ballast supports vapor handling and routine process use.
- Protective internal coatings and a large oil capacity help reduce contamination effects.
- Three-phase motor requires installation by a qualified electrician.
Technical Specifications
| Specification | Value |
|---|---|
| Pump design | Two-stage, oil-sealed, direct-drive rotary vane |
| Free-air displacement at 60 Hz | 52.5 cfm / 1487 L/min |
| Ultimate pressure | 0.002 Torr |
| Pump speed at 60 Hz | 1760 rpm |
| Noise level | < 58 dBA |
| Oil capacity | 4.3 L |
| Inlet / exhaust flange | NW40 |
| Recommended tubing ID | 1-5/8 in ID |
| Approximate weight | 220 lb |
| Approximate dimensions (L × W × H) | 31.4 × 10.3 × 14.5 in |
Published performance is nominal and may vary with motor frequency, condition, lubricant, process gas and measurement method. Confirm the exact part number before ordering.
Available Configurations
| Welch part number | Electrical / factory configuration | Availability |
|---|---|---|
| 3657T-01 | 240–265/415–460 V / 60 Hz / 3-phase | This configuration |
Maintenance, Oil & Filters
| Maintenance item | Recommended product or resource | Part number / notes |
|---|---|---|
| Vacuum pump oil | Welch Premium Oil or verified VPS equivalent | Confirm viscosity, process gas and material compatibility before substituting oil. |
| Repair kit | CRVpro 65 service and repair parts | Confirm by serial number |
| Exhaust / oil filtration | Email us to confirm the correct filter | 1417D-40 directional exhaust filter; confirm flange and installation before ordering. |
| Resource Center | Welch Vacuum Pump Resource Center | VPS-owned cross references, repair parts and maintenance guidance. |
Applications
Freeze drying, vacuum ovens, Schlenk lines, vacuum concentration, backing turbomolecular pumps, degassing and vessel or chamber evacuation. Direct-drive pumps are not recommended for sustained operation above 30 Torr.
Resources
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