Taking less than 0.3 sec to close, Protection Vacuum FONT color Valve protects in-process products in event of vacuum pump failure. Bellows-sealed, pneumatically actuated, SS valve system monitors up to 4 pumps with local or remote control and LCD status display. Internal mechanism has low particle generation design and is shielded in open and closed positions against particulate accumulation, extending life under adverse conditions. For more information,please visit http://www.bossgoo.com