Steam traps in heating systems and commercial systems may look the same but the difference comes in how we use them. Heating traps run on very low pressure and that affects how we size the trap.
It doesn’t take much steam pressure to warm people. You can see this in the definition of the term equivalent direct radiation (or EDR for short). With steam heating, 1-square-foot of EDR will give out 240 Btu/hr when there is 70° F air on the outside of the heater and 215° steam on the inside of the heater. That’s steam at about 1-psig pressure. You don’t need much, and this is how they manage to heat the entire Empire State Building with only 1 1/2 psi pressure. And that’s on the coldest day of the year.