Section 3: Operation; Leak Detection; Operating Pressure Range; Shutdown Procedures - Welch 2560 Owner's Manual

Dry vacuum pumps

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Table Of Contents

Table of Contents

3.10

Starting Procedures

3.11

Starting a Welch Dry Vacuum Pump

Before attaching the pump to a system it is well to familiarize yourself with the function and action of the

pressure vacuum pump that you have acquired. Review the power requirements as described in Section 2.6.

Welch recommends running the pump for a few minutes to warm up before use. The warm-up improves the

pump's ability to handle humid air.

3.12

Cleanliness

Take every precaution to prevent foreign particulates from entering the pump. Particulates will damage the

pump's performance. If you find that particulates will come off the process during evacuation, a particle trap

in the foreline will work. A simple, inexpensive trap may be made by placing glass wool in a glass or plastic

tube. Screens must be inserted to hold the glass wool in place.

The Pump is not recommended for pumping acid, base or organic vapors or

gases. Serious damage to the pump will shorten the pump's service life.

In addition, pumping flammable vapors or gases can lead to serious safety

3.13

Leak Detection

The importance of eliminating all leaks in a vacuum system is obvious. The pump must remove this added

volume of leaked gas to maintain the desired vacuum. Leaks for these pumps can be located by slightly

pressuring the system and painting the suspected area with a thick soap solution. Escaping air will produce

soap bubbles.

3.14

Operating Pressure Range

Models 2560, 2561, 2565, 2580, 2581 and 2585 Dry Vacuum Pumps are designed to be run from atmospheric

to their maximum vacuum level on the intake side. Consult the Specification Table in the back of this manual

for the ratings for your specific model.

3.15

Shutdown Procedures

After use, Welch recommends the pump be run for about 2 minutes disconnected from the vacuum process.

The air pumped through the mechanism will purge out water vapor or droplets of water condensate that may

have formed on the inside of the pump. This purge of the pump mechanism helps prevent corrosion.

Welch dry pressure\vacuum units are 100% oil-free. The pump employs a non-lube piston and cylinder. No

maintenance is necessary for the bearings. All bearings are sealed and permanently lubricated. Lubrication

should not be attempted. The units are built for continuous duty operation with the quietness and durability of

a diaphragm, but with piston p