Description
Welch R 1397 Duo Seal Belt-Drive Vacuum Pump 3/4 HP Dayton 4K789F Motor
The Welch R 1397 is a belt-drive, oil-sealed rotary vane vacuum pump from Welch Scientific Company's classic Duo Seal series — a design that uses a double oil seal arrangement to maintain vacuum integrity and minimize oil migration into the vacuum system. The pump is driven by a Dayton 4K789F single-phase induction motor through a large cast iron spoked pulley and a Demco 4L480 V-belt. The complete assembly is mounted on a welded steel frame with casters for in-facility mobility.
Specifications & What's Included
- Make: Welch Scientific Company (Skokie, IL)
- Series: Duo Seal
- Model: R 1397
- Drive Type: Belt drive via Demco 4L480 V-belt and large cast iron spoked pulley
- Motor Brand/Model: Dayton 4K789F
- Motor Power: 3/4 HP
- Motor Voltage: 115 / 208–230V AC
- Motor Full-Load Current: 10.8A (115V) / 5.4A (208–230V)
- Motor Frequency: 60 Hz
- Motor Phase: Single Phase
- Motor Speed: 1725 RPM
- Motor Frame: NEMA 56
- Service Factor: 1.25
- Insulation Class: A; Ambient Temperature: 40°C
- Time Rating: Continuous (CONT)
- Thermal Protection: Thermally protected
- Bearing Type: Sleeve bearings (lubricate with SAE 20 non-detergent oil every 1.5 years)
- Oil Level: Monitored via dual oil-level sight windows on pump body sides
- Overall Dimensions: 29 x 15 x 20 in (L x W x H)
- Mounting: Welded steel frame with casters
- Includes: Pump, Dayton motor, steel frame with casters, Demco 4L480 V-belt
- Freight shipping required — please contact us for a quote or to arrange local pickup
Applications
The Welch Duo Seal series of belt-drive vacuum pumps are workhorses of the scientific and industrial laboratory world, in production continuously from the mid-20th century through the early 2000s. They are commonly used in applications requiring a deep, sustained vacuum: distillation and evaporation, freeze-drying and lyophilization, filtration, degassing, vacuum ovens, and general laboratory vacuum service. The oil-sealed rotary vane design allows these pumps to achieve rough/medium vacuum levels (into the micron range) suitable for a wide range of chemistry, physics, and industrial process applications. The belt-drive configuration transmits power smoothly and allows the motor to be isolated from pump vibration. Welch Duo Seal pumps are well-regarded for their robust, serviceable construction, and parts and oil supplies remain available for maintenance. They are found in university and industrial labs, chemical processing facilities, and anywhere a reliable, high-volume rough vacuum source is needed.
This Welch R 1397 Duo Seal Belt-Drive Vacuum Pump has been inspected and appears to be in good condition. The pump body shows paint loss and surface wear typical of older industrial equipment — notably on the housing sides and around the oil-level window. The Dayton 4K789F motor's drive-end sheave shows surface rust, and the motor housing has some paint wear, though the motor itself appears intact and complete. The Demco 4L480 V-belt is present and seated on the large cast iron drive pulley. The unit sits on a steel mounting frame with casters for mobility. This is a large, heavy piece of equipment (approximately 195 lbs) and will require freight shipping — please contact us for a freight quote, to arrange local pickup, or to schedule a viewing at our facility. Please view our photo set and contact us if you have any questions.
Warranty Information
Additional Information
Brand: |
Welch |
Model: |
R 1397 |
MPN: |
R 1397 |
Type: |
Belt-Drive Duo Seal Vacuum Pump |
Series: |
Duo Seal |
SKU: |
46990 |
Motor Brand: |
Dayton |
Motor Model: |
4K789F |
Motor Power: |
3/4 HP |
Voltage: |
115/208-230V AC |
Current (Full Load): |
10.8A (115V) / 5.4A (208-230V) |
Frequency: |
60 Hz |
Phase: |
Single Phase |
Motor Speed: |
1725 RPM |
Motor Frame: |
56 |
Service Factor: |
1.25 |
Drive Type: |
Belt Drive |
Drive Belt: |
Demco 4L480 V-belt |
Time Rating: |
Continuous (CONT) |
Thermal Protection: |
Thermally Protected |
Insulation Class: |
A |
Ambient Temperature: |
40°C |
Bearing Type: |
Sleeve |
Lubrication: |
Oil-sealed (Duo Seal); motor: SAE 20 non-detergent |
Dimensions: |
29 x 15 x 20 in (L x W x H) |
Drive Pulley: |
Large cast iron spoked flywheel/pulley |
Manufacturer Location: |
Welch Scientific Co., Skokie, IL USA; Motor: Dayton Electric Mfg Co., Chicago IL |
Country/Region of Manufacture: |
United States |
Seller Notes: |
Pump and motor on steel frame with casters. Includes Demco 4L480 drive belt. Freight shipping required — contact us for a quote. |
Condition Notes: |
This Welch R 1397 Duo Seal Belt-Drive Vacuum Pump has been inspected and appears to be in good condition. Shows typical paint wear and surface rust on the motor sheave. Belt and drive pulley present. |
California Prop 65 Warning: |
WARNING: This product can expose you to chemicals including lead and lead compounds, and DEHP (a phthalate), which are known to the State of California to cause cancer and birth defects or other reproductive harm. Go to P65Warnings.ca.gov |
