Mercer Valve Pressure Relief Valve 91-12J13LA7B8

The following general procedure is recommended for the disassembling of a 9100 Series PRV

Non-standard or “special” configurations are possible and these instructions may not be reflective of them

A special configuration is indicated by a special code at the end of the PRV’s part number

Always make sure there is no pressure in the system prior to removing a PRV

The 9100 Series contains several different orifice sizes

For most C to G orifices, the valves are bottom entry type with the bonnet integral to the body cavity

These valves have a removable inlet base

Larger orifice sized valves are top entry types and have removable bonnets

Warning: This inspection requires trained personnel with PPE!

Seat inspected for cuts and abrasions?

Seat polished and restored if minor scratches or abrasions found?

Seat replaced if deep abrasions and cuts found?

Enter the diameter, Ds, of the nozzle

Spherical surface portion that engages the seat is clean and smooth?

Spherical surface polished if minor imperfections exist?

Warning: This procedure requires trained personnel with PPE!

Internal parts visual inspection

Warning: This inspection requires trained personnel with PPE!

Set pressure of the valve verified?

Enter the set pressure of the valve

Contact Mercer Valve Co., Inc. for proper leak pressure and specification for the valve

Pressure held steady during the test?

Any leakage observed during the test?

Choose the method used for testing leakage

Zero bubbles observed for one minute in API 527 test?

Warning: This procedure requires trained personnel with PPE!

Valves transported to the shop?

Note: The main disadvantage in offsite testing is time