Mercer Valve Pressure Relief Valve 81-11151P18G21

Warning: This inspection requires trained personnel with PPE!

Enter the set pressure of the valve

Enter the CDTP of the valve if applicable

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

Did the valve maintain steady pressure during the test?

If the valve did not maintain steady pressure, it may have a potential leak and should be removed for further testing

Did the valve pass the API STD 527 test?

Did the valve pass the flow gauge test?

Warning: Ensure the valve is not pressurized before starting the inspection

Check for corrosion and damage to the valve

Check the valve cap and seal wire for tampering

Check the security seal on the seal wire

Check the flanges for wear and proper fastening

Check the threads on the threaded connections for damage

Inspect the valve's outlet for corrosion or debris accumulation

Check the external surface of the valve for damage

Check the valve tag information and verify to the service conditions

Warning: This maintenance check requires qualified repair personnel!

Is the PRV correct for the application?

Are there any apparent problems with the PRV?

Is the nameplate information correct?

Is there any damage to the valve?

Are there any issues that would keep the valve from opening or inhibit flow?

Are there any problems found during the visual inspection?

The following general procedure is recommended for the disassembling of a Mercer 8100 Series PRV.; Non-standard, “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.

These instructions are divided into two sections: 1” Body and 2” Body.

1. Cut and remove the seal wire and unscrew the cap to expose the adjustment screw.

i) Go to "c" if the valve is a lift lever configuration.

2. Loosen the lock nut from the adjustment screw.

3. Relieve the compression on the spring by turning the adjustment screw counter clockwise.; This is important so that components will not spring out and pose a hazard.; If the adjustment screw begins to appear as residing back into the bonnet during the relieving of the preload, then the spring compression has been completely removed and the adjustment bushing is beginning to re-compress the spring.

4. Rigidly support the body to prevent movement during disassembly.

5. Unscrew the inlet base using the appropriate wrenching flats.; 6. Remove the set spring and discard the disk subassembly.

Warning: This procedure requires trained personnel with PPE!

Enter the pressure losses to the gauges