NETD, NPTD and NHPTD Timed Condensate Drains

Three families, one timer

Economy, premium and high-pressure valves under the same control

These are timer-operated drains: a solid-state timer with an adjustable interval and open time fires a solenoid valve, and a 6 ft cord is included. The NETD is the economy low-flow unit with a 1/4, 3/8 or 1/2 in outlet. The NPTD is the premium unit with a larger valve, in brass at 1/2 in with four voltages or in stainless at 1/4, 3/8 and 1/2 in. The NHPTD is the high-pressure version for 600 to 6,000 psig vessels. Timed drains vent a little air every cycle, so they belong on intermittent and low-flow service and on vessels where no zero-loss drain is rated.

Where a timer drain is the right answer. A solenoid on a timer has no float to stick in rusty or oily condensate, which is what a receiver on an old piston compressor produces; On a compressor that runs a few hours a day the air vented is small; on one that runs around the clock a zero-loss drain pays back; The stainless NPTD stands up to condensate from synthetic lubricants and to wash-down areas; Above 300 psig the NHPTD is the only drain in the line that is rated for the vessel.

Set the timer to the condensate, not the clock. Start at 2 minutes between cycles and 2 to 5 seconds open in summer, then stretch the interval in winter when the air is drier; If air hisses at the end of every discharge the open time is too long; shorten it until the valve closes on water; A receiver behind a 25 hp compressor makes a gallon of condensate every hour or two on a humid day; the 1/2 in NPTD clears it, the 1/4 in NETD is for filters and small tanks.