It is usually installed at the inlet end of the pressure reducing valve, pressure relief valve, fixed water level valve or other equipment to remove the argentine in the medium to protect the valve.
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About FAO Forestry. The FAO Forestry Department helps nations manage their forests in a sustainable way. The Organization's approach balances social, economic and environmental objectives so that present generations can reap the benefits of the earth's forest resources while conserving them to meet the needs of future generations.