Abstract: An apparatus is disclosed for receiving a high pressure fluid flow to accommodate a drop to a lower pressure fluid flow with attenuated noise, incorporating an initial diffuser stage followed by balance in-line stages so that each stage is subcritical to avoid shock noise. Specifically, an elongated tubular member is closed at one end and adapted to receive high pressure fluid flow at the opposed end. Perforations contiguous to the upstream end afford a diffuser stage of pressure reduction which is followed by concentrically mounted, perforated plates to accomplish staged pressure drops. Structurally, the elongate tubular member is fixed somewhat concentrically in a cylindrical housing along with a series of the perforated plates which are peripherally supported by the housing and centrally supported by the elongated tubular member.A diffuser as the first stage affords superior strength to withstand impacts and pressure loading.

Abstract: A stabilizer is disclosed, as for use at the intake to a fluid pump, comprising a tank for containing a reservoir of liquid for supplying the pump. Extending from and above the tank, a tube provides a dome to confine a volume of gas to dampen pulsations created by the pump. The gaseous phase (vapor) in the dome is maintained in the tank by a heater mounted on the dome in such a manner as to provide heat somewhat related to the need for increasing the volume of the gaseous phase. Increased heat transfer within the tank vaporizes liquid to increase the pressure of the gaseous phase resulting in an increase in volume.