ANSI Class 150-2500
AXELVALVES ALT-1 Steam Traps are manufactured to the highest quality and standards. Built to customer requirements for special applications and severe service conditions.
This type of trap is operated by the internal energy of steam. Condensate and air entering the trap raise the disc, and flow continuously throughout the discharge orifice.
Steam entering the trap expands suddenly as it reaches the underside of the disc. The resulting high flow velocity causes a decrease in pressure under the disc. Steam above the disc is stationary, and therefore at higher pressure. This pressure imbalance, forces the disc onto the seat, closing the trap. When condensate appears at the trap inlet, the
steam above the disc condenses releasing the pressure and allowing the discharge cycle to repeat.
The operating principle is based on a balance between the steam force (pressure dependent), trying to open the discharge valve, and the opposing bi-metal force (temperature dependent), which tends to close it. The trap is adjusted so that a saturated steam temperature the bi-metal force will prevail, while with under cooled condensate and air, the force of pressure will prevail and open the valve. For a well designed trap, the required under cooling should be the minimum possible throughout the designed pressure range. Being the steam force a curve while the bimetallic force a straight line, an additional compensating spring will break the straight line to make it follow the curve of steam more closely, making field adjustment unnecessary.
The operating principle is based on the different density between steam and condensate. The weight of the float, acting throughout the lever keeps the valve closed when the trap is empty. As the condensate enters in the trap it rises the float and opens the valve overcoming the pressure acting on it. If no more condensate reaches the trap the float descends closing the valve again. When the condensate level in the body is always above the valve creating a perfect water seal. The closed float trap is unable to discharge air therefore a small thermostatic air vent is always installed inside the body at this purpose.