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Enardo ES-850 and Enardo ES-950 Series
For preventive maintenance of the Fisher™ pressure/
vacuum relief valve, refer to the following instructions.
1. Loosen the fasteners on top of the valve and remove
the lid, hood or guide.
2. Remove any valve pallets and weights from the unit.
Keep in mind that these will be reinstalled, so keep track
of the chamber from which they were removed.
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3. Inspect the pallets for any damage or buildup that
may affect its sealing characteristics or its ability to
move properly inside the valve. Gently clean the seal
with a suitable solvent and lint free, nonabrasive
cloth to remove any dirt/particles and achieve good
seal tightness.
4. Clear away any buildup on the weights or on
the housing.
5. Inspect the valve seats installed in the unit. The sealing
surfaces should be smooth and free of nicks or buildup.
A good, clean seat sealing surface free from defects is
essential to achieving a tight seal. Check the guides for
anything that may keep the valve pallet from moving
properly inside the valve. If necessary, gently clean the
seats with a suitable solvent and nonabrasive cloth.
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