[PDF] Issue 99 - OISD
Save water in simple ways like not letting the tap run while shaving, washing, or brushing .... with higher ESI ranking means, it has managed its natural resource stock judiciously; face ... slamming shut of a non return ( check) valve, sudden pump failure etc. ... about last 15% for butterfly valves, about last 25% for ball valves.
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oisd's website is oisd.gov.in