A valve assembly includes a valve body configured to define a chamber forming a primary flowpath between an inlet port and a discharge port, an isolator disposed inside said chamber, and a poppet having a bore. The isolator is defined by a skirt and a stem, with the stem coupled to the valve body, and the skirt affixed to the stem. The poppet is disposed inside the chamber, and the bore is slidably received over the skirt. The isolator is configured to guide the poppet relative to the valve body, and the skirt is configured to shield the bore and isolate the poppet from substantially all of a dynamic pressure component of pressurized fluid when pressurized fluid flows from the inlet port past a portion of the poppet and then through the discharge port of the valve assembly.
