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Description and Operation

The Spirax Sarco TD62 is a Thermo-Dynamic? disc type steam trap. The trap cycles

open and closed to discharge condensate close to steam temperature and closes tight

between discharges.

The disc, which is the only moving part, rises and falls in response to dynamic forces

produced by the partial re-evaporation (flashing) of hot condensate. Cool condensate,

air and other non-condensible gases enter the trap through the central orifice, lift the

disc, and are discharged through the outlet orifice. When the condensate approaches

steam temperature, a portion of it flashes as it enters the trap. The flash steam passes

at high velocity over the underside of the disc and collects in the control chamber

above. The resulting pressure imbalance forces the disc downward onto the seating

surfaces, stopping the flow. The trap remains tightly closed until the loss of heat

through the cap lowers the control chamber pressure, allowing the inlet pressure to

raise the disc and repeat the cycle.

An insulating cover minimizes the effect of ambient conditions.