A pilot-operated steam trap is provided with a series of bimetallic elements which operate sequentially to control the opening and closing of the pilot valve of a pilot-operated steam trap.PLUG VALVES Each separate series of the bimetallic elements have their outer edges on separate shoulders within the valve member and have central openings through which the stem of the pilot valve passes.Water Pump Control Valves Separate shoulders are provided on the stem of the pilot valve, each adapted to be engaged by one of the series of bimetallic elements to prevent transmission of the force of one bimetallic element to the next adjacent bimetallic element. Resilient Seated Gate ValvesA pilot operated steam trap having a body with an inlet and an outlet, means providing a control chamber within said body intermediate the inlet and the outlet, a main valve seat between the inlet and outlet, a generally cylindrical main valve member carried within the control chamber for axial movement toward and away from said main valve seat, said main valve member having a valve portion on one end surface thereof to engage said valve seat and having means defining a recess extending into said main valve member from the other end surface thereof, a first flow control passage of substantially fixed restriction to flow providing fluid communication between the inlet and the control chamber, a second flow control passage through said one end surface of said main valve member providing fluid communication between the control chamber and the outlet, a pilot valve controlling said second flow control passage mounted for movement between closed and open positions, said pilot valve in the fully open position providing said second flow control passage with less restriction to flow than said first flow control passage, a plurality of independent spaced apart temperature responsive elements in said control chamber supported by and movable with said main valve member, means defining a plurality of stepped shoulders corresponding in number to said plurality of temperature responsive elements on said main valve member within said recess, each of said temperature responsive elements having outer edge portions loosely engaged on a corresponding shoulder in said main valve member recess, a stem interconnected with said pilot valve and projecting upwardly centrally of said main valve member recess, said elements each having a central opening therein surrounding said pilot valve stem, means defining a plurality of shoulders corresponding in number to said plurality of temperature responsive elements about said pilot valve stem with each of said shoulders facing in a direction opposite the shoulders of said main valve member recess, said temperature responsive elements each having an inner edge surface surrounding its central opening adapted to engage the corresponding shoulder of said stem between said open and closed positions, each of said plurality of temperature responsive elements adapted to aid in control of movement of said pilot valve, one of said temperature responsive elements adapted to aid in control of movement of said pilot valve from its fully open position to its fully closed position, and at least one other said temperature responsive elements adapted to aid in control of movement of said pilot valve from a partially open position to its fully closed.

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