Sigma valves & filters can be relied upon to require minimum maintenance & to provide maximum reliability. These valves & filters provide the relatively easy on, Off function to control flow & pressure relief. All dampened sections of valves & filters are made Constructed using borosilicate glass material 3. 3 & ptfe, Which ensures maximum resistance to corrosion. The complete valve consists bakelite valve bonnet with, Ptfe bellow of glass, With nut valve body ms spindle etc. Multiple categories of valves like line valve, Drain valve, Bottom outlet valve, Vent valve, Adjustable overflow valve, Non, Return valve flap type, Non, Return valve ball type, Pressure sampling valves, Relief valve are available. Pipeline filters are recommended to eliminate contaminants from gas & liquid streams in glass pipelines. The assembly is designed such that the filter can be easily removed for cleaning or replacement.