Welch Vacuum 8925 Direct Drive Rotary Vane Pump - Manual (Page 5)

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Section 1: INSTALLATION
1.01 Unpacking
Carefully remove the pump from the shipping carton. Keep all paperwork and inspection tags for future
reference. If shipping damage has occurred, a claim must be filed with the carrier immediately; keep the
shipping container for inspection by the carrier.
1.02 Pump Mounting
Rubber bumpers are supplied with the pump base. They isolate noise and eliminate creeping. For more
rigid mounting requirements the pump base can be bolted directly to a surface by removing the bumpers
from the base and using the mounting holes and slots featured on the base.
1.03 Pump Location / Environmental Conditions
The pump should be located in a clean and well-ventilated area and adequate space should be provided
wherever possible for routine maintenance such as oil changes. For best performance, the pump should
be located as closely as possible to its system. Determining factors for pump location should include
length and size of connections, the number of bends, and the type of exhaust connections.
1.04 Exhaust Provisions
Exhaust connections will be determined by the type of system to be exhausted and the desired
cleanliness of the air surrounding the pump. Under normal pumping conditions the optional exhaust
filter will be adequate. Refer to Section 9, Accessories for available exhaust filters. Where extreme
exhaust conditions are encountered, it is best to pipe the exhaust out of the building. Always use thick
walled rubber vacuum hose, wire reinforced PVC tubing or metal pipe for exhaust lines to avoid the
possibility of the line becoming crimped or collapsing resulting in dangerous exhaust line blockage.
The exhaust connection is a 1”-20 threaded port for all Models except 8905 which is 3/4”-20. The port
is located on top of the oil reservoir. See section 9.02 Exhaust Filters to find the correct filter for each
pump. If a hose nipple is preferred for the exhaust port, use part number 1393K for models 8907, 8912
and 8917.
Call Welch customer support (847) 676-8800, ext. 1, prior to start-up if you have any questions.
WARNING
Never block or impede air flow from the exhaust port. High
pressure can build up within the oil reservoir if the exhaust port
is blocked. Check frequently, especially if exhaust is piped
out of the building.