USER MANUAL FOR THE HYDRAULIC UNIT for the underwater hatches type:001013 pagina 6

WORKING WITH THE UNIT type:001013 Preventive actions first echelon. An optical readout of the ruling line pressure is assured by a glycerine manometer till 250 bar. The manometer can be separated from the lines by a needle valve. It may be recommendable to open this needle valve only for daily checks, since these instruments are sensible to pressure vibrations.