A steam trap is provided with two paths through which fluid flows from its nput to its output. One path constitutes a control path wherein a small amount of steam or condensate continuously flows through restrictive orifices connected in series between the input and the output. MULTI-FUNCTIONAL WATER PUMP CONTROL VALVEThe other path constitutes a main flow path in which a quiet throttling element having a plurality of resistive flow passages and having a moveable valve plug, controls the amount of fluid flowing therethrough. The position of the valve plug and a control piston connected thereto is a function of the fluid flow through the control path between the two orifices; Forged Steel Valvesthe input and discharge fluid pressures; and a spring connected to the control piston. A steam trap comprising: a first means connecting the trap to a high pressure steam line; a second means connecting the trap to a discharge line; a quiet valve of the type having multiple resistive flow passages interposed between and connected to said first and said second means, Instrumentation Ball Valves said valve having a valve plug operative in response to varying fluid pressures in said first and second means to adjust the flow through the valve; a bypass means having first and second resistive orifices spaced apart; a piston connected to said valve plug and fluidically communicating with the bypass means and said second means to operate in response to fluid pressure in said bypass means and said second means, said pressure in said bypass means varying in response to the proportionate mixture of steam and condensate flowing through said bypass means, and said orifices being adjusted to produce a pressure differential across said piston sufficient to operate said valve plug; and a duct extending from said second means to said piston for applying the discharge pressure in the second means to said piston to oppose the pressure force on the piston from the fluid in said bypass means.

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