MERCER VALVE COMPANY, INC.
9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE
INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
MERCER VALVE CO., INC. RESERVES THE RIGHT TO CHANGE
PRODUCT DESIGNS AND SPECIFICATIONS WITHOUT NOTICE.
Rev.: J
Date: 23-July-2020
ECN: 3152 Page | 8
4. Unpacking and Storing
A PRV should be installed immediately after being removed from the storage/ shipping box when
possible. When the valve cannot immediately be installed, certain storage precautions should be
taken to keep it functioning properly until it is installed. Following these recommendations will
encourage proper function of the valve prior to installation. These recommendations only apply to
Mercer Valve Co., Inc. manufactured pressure relief valves. Other valve brands can have different
requirements and their manufacturer should be contacted for information.
The PRV should be stored in a dry, indoor environment at temperatures between 50ºF (10ºC) and
90ºF (32ºC). The inlet and outlet of the valves should be protected from any possible damage.
Threaded valves should have thread protectors installed. Flanged connections should be covered
to protect their raised faces from scratches and dents. The protectors should also seal the openings
so that foreign materials cannot ingress.
PRVs are usually stored vertically to keep parts aligned, however, this isn’t required for Mercer’s
PRVs. Although vertical storage can help with initial startup in certain circumstances, these valves
may be stored horizontally.
Before installing a valve that has been stored, it should be visually inspected for any damage. It is
recommended to test the valve before installation if it has been stored for more than one (1) year.
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