HXF-IZ PRESSURE VACUUM RELIEF VALVE WITH FLAME ARRESTOR details:

Pressure vacuum relief valve with flame arrestor
Model HXF-IZP is designed to vent to atmosphere to protect your tank from damage created by over-pressure or excessive vacuum. As well as providing the primary layer of protection for tanks and process systems, pressure/vacuum valves also minimise emission losses of gases or vapours, thus protecting the environment and providing significant financial savings.

Product features
1, Size 50mm-300mm
2, Pressure settings 355pa to 1750 pa
3, Vacuum settings -295pa 
4, With flame arrestor

Maintenance and servicing
In order to make flame retardant breathing valve use safety, should dismount bellows flame retardant I ayer in 3-6 months regularly, cleaning, make sure that every hole in flame retardant layer are unobstructed, avoid block, make sure it use safety and normal. Regularly check the positive, negative valve plate movement is flexible, Check leading mark and disc seating facing damage or not, should change immediately if damage. When check maintenance and installation again, should insure each junction surface of the valve fit closely, disc rising flexibility, when new valve start operating, before the installation, should remove the flange protection cap clean the quakeproof matters between disc, otherwise the breathing valve will malfunction.