Welch 1402 DuoSeal Vacuum Pump

The Welch 1402 DuoSeal is a two-stage, belt-driven rotary vane vacuum pump built for rugged reliability and long-term performance. Trusted for decades in laboratories and industrial facilities, it delivers consistent high-vacuum operation with excellent vapor handling, minimal vibration, and exceptionally quiet performance. Its proven design and large oil reservoir make it highly resistant to contamination, ensuring dependable results even in demanding environments.

At HiTechTrader, we offer the Welch 1402 DuoSeal Vacuum Pump as a cost-effective solution for laboratories and industries that need reliable high-vacuum performance without compromise. With a pumping speed of 5.6 cfm and an ultimate vacuum of ~1 × 10⁻⁴ Torr, the 1402 combines quiet, low-RPM operation with superior vapor handling. Whether purchased new, refurbished, or fully rebuilt, each unit is inspected, tested, and backed by warranty, giving you confidence in critical applications like freeze drying, vacuum distillation, epoxy degassing, and as a backing pump for diffusion or turbomolecular systems.

Specifications

1. Pumping Speed: 5.6 cfm (≈160 L/min) at 60 Hz
2. Ultimate Vacuum: 1 × 10⁻⁴ Torr
3. Motor Power: 0.5 HP
4. Operating Voltage: 115 V, 60 Hz, single phase
5. Oil Capacity: 2.1 liters (2.25 quarts)
6. Connections: 1-inch NPT inlet/outlet
7. Weight: 112–132 lbs (depending on configuration)
8. Dimensions: 20 × 12 × 15 in
9. Drive: Belt-driven, low RPM for reduced wear and quiet operation

Key Features

1. Dual-stage rotary vane design achieves deeper vacuum with enhanced vapor tolerance.
2. Rugged belt-driven, low-RPM operation reduces wear and extends service life.
3. Large oil reservoir improves vapor handling and contamination resistance.
4. Smooth, low-vibration performance for stable integration in lab or industrial setups.
5. Built for continuous duty in demanding high-vacuum processes.
6. Available new, rebuilt, or refurbished, all tested and backed by warranty.

Applications

The Welch 1402 DuoSeal is widely used in:

1. Freeze drying (lyophilization)
2. Vacuum distillation
3. Rotary evaporators
4. Vacuum furnaces
5. Backing for turbomolecular or diffusion pumps
6. Epoxy and resin degassing
7. Refrigeration system evacuation
8. Laboratory manifolds and glove boxes
9. General R&D requiring a stable high vacuum

Maintenance & Usage Recommendations

1. Place in a clean, well-ventilated area with room for oil changes and belt adjustments.
2. Position close to the vacuum system to reduce tubing length and improve efficiency.
3. Perform regular oil changes and preventive maintenance for optimal results.
4. Avoid continuous operation above 1 Torr to reduce oil carryover and wear.
5. Rebuilds include complete disassembly, replacement of vanes, gaskets, and seals, followed by full system testing.

Market Availability

1. Offered new, rebuilt, or refurbished, often with warranty.
2. Rebuild services extend pump life at a fraction of the cost of replacement.
3. Spare parts kits (vanes, seals, gaskets, valves, etc.) readily available for maintenance.

Why Buy from HiTechTrader?

When you choose a Welch 1402 DuoSeal from HiTechTrader, you're getting more than just a pump, you're gaining reliability, value, and expert support. Every unit is carefully refurbished or rebuilt with replacement seals, vanes, and gaskets, then fully tested to meet or exceed factory specifications. Our pumps are backed by warranty and decades of hands-on expertise in vacuum technology, ensuring you get long-lasting performance at a smarter cost. With readily available spare parts, rebuild services, and dedicated support, HiTechTrader makes it simple to keep your Welch 1402 running smoothly for years to come.