Global Drain Valve Market By Type (By Material , Steel Drain Valve , Brass Drain Valve , Plastic Drain Valve , By Principle , Automatic Drain Valve , Electronic Drain Valve , Pneumatic Drain Valve , By Type , Full flow type , and SCS type), By Application (Automotive , Marine , Industrial , Construction Machinery , Ordinary equipment , Agriculture , and Residential), By Region, and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2020-2029