Combination Air By-Pass/Air Control Valve
The combination air by-pass/air control valve is used with some MTA systems. The valve combines functions of 2 normally closed valves in one unit. There are bleed type and non-bleed type valves. Both look alike. Bleed type valves will have percentage of bleed rating molded on side of case. The by-pass portion of valve releases air into atmosphere, while control valve portion redirects air.