Condensate and heat recovery systems > Mechanical pumps
APT14 is a Spirax Sarco automatic pump-trap that drains continuously when pressure is available and switches to pressure-powered pumping when backpressure or vacuum stop ordinary trap discharge.
Quick facts
APT14 automatic pump-trap is a model-led route for users already searching for APT14, pump traps or pressure powered condensate pumps for stalled heat exchangers and closed return systems. It sits under mechanical condensate pumps but focuses on one verified model boundary.
The verified technical and installation material confirms APT14 as a PN16 automatic pump-trap that changes between trap mode and powered pumping mode according to system conditions. The documented APT14 connection routes are:
DN40 x DN25 flanged1 1/2" x 1" screwedDN15 (1/2") motive steam / exhaust connectionThe same documentation set also covers APT14HC and APT14SHC, but this page keeps only standard APT14 complete-unit options in the selector.
At the reference duty of 1 m installation height, 5 bar g motive steam and 1 bar g backpressure, APT14 is listed with 5 L per cycle, 4000 kg/h maximum trapping-mode capacity and 1100 kg/h maximum pumping-mode capacity.
APT14 is usually reviewed where ordinary trap drainage fails because differential pressure falls away, backpressure rises or vacuum develops. That means temperature-controlled heat exchangers, closed condensate return systems, low-level installations and hot condensate duties where electric pumps would add cavitation or hazardous-area complications.
Before final selection, confirm motive steam pressure, total backpressure, installation height, real condensate load and whether the duty should move up to APT14HC. The verified installation guide also points to normal system checks such as draining the motive steam line properly, fitting a Y strainer at the condensate inlet and reviewing outlet line sizing.
APT14 selection usually sits between condensate recovery, stalled heat exchanger drainage and wider pumped-return decisions.
Return to the mechanical condensate pump family to compare automatic pump traps, pressure powered pumps and wider condensate recovery duties.
Review stalled heat exchanger guidance when the real issue is condensate back-up rather than a general pump selection question.
Compare electrical condensate pumps when the application does not need trap and pump operation in one body.
