AFC - Model 521 Series - Inverted Bucket Steam Traps - Brochure

Armstrong Model 521 horizontal installation offers smaller capacities at higher pressures. A unique leverage system multiplies the force provided by the bucket to open the valve against system pressure. The mechanism is free-floating and has no fixed pivots to create wear or friction, because the mechanism is located at the top of the trap, no dirt can collect on the orifice.