Pumping trap for condensate

Claim 1

A pumping trap comprising, in combination, a main body defining a condensate sump, inlet and Outlet passages and supply and exhaust passages communicating with said condensate sump, a float cover fitted to form part of an enclosure constituting said condensate sump, a float accommodated to be freely movable within said float cover, said cover including means defining a float chamber in which said float is housed, an open water collecting pipe connected with said float cover at the lower portion thereof and extending downwardly to communicate said float chamber with said condensate sump, orifice means communicating said exhaust passage with said float chamber, a first check valve provided in said orifice means to discharge air from within said float chamber, a second and a third check valve unit each provided, respectively, on said inlet and outlet passages, said second and third check valve units being detachably mounted directly within said main body, two pressure operated valves each including a pressure chamber provided on said supply and exhaust passages respectively, and a pilot valve operatively associated with said float whereby opening and closing of said pilot valve is effected by rise and fall of said float, and whereby opening and closing of said two pressure operated valves is effected inversely of each other by pressure variation in the pressure chambers of said valves in accordance with opening and closing of said pilot valves.