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A pressure breakdown orifice is required to control the fluid flow rate when discharging from High pressure to Low pressure requirements such as pre-filling descale headers and centrifugal pump minimum flow bypass. This orifice is located in the bypass line around the descale spray valve for Header Prefill and on the high pressure discharge side of the pump.

Hunt Valve’s pressure breakdown orifices are specially designed for maximum life and ease of maintenance. These orifices are individually created to handle the pressure drop and pressure/flow rate requirements of each application. A series of heat-treated stainless steel orifice plates are used to reduce the pressure from the inlet to the outlet. Each orifice plate is designed to provide a small pressure drop, which spreads the wear throughout the components. O-rings with Teflon™ back-up rings seal the orifice

plates to the stainless steel housing. A unique feature of Hunt’s design is an extended stainless steel liner located at the outlet side of the orifice assembly which protects your mating piping system from erosion due to the high-velocity turbulent flow exiting the orifice plates.

At Hunt Valve, each breakdown orifice assembly is designed for the customer’s specific application, considering inlet/outlet pressure and flow requirements. The following flange connections are available: ANSI, SAE 4-bolt or DIN. Special flanges and configurations can also be designed. Pressure test ports can be included to easily monitor wear. Installation is allowed in the horizontal or vertical position. The orifice assembly is mounted between piping flanges; no mounting brackets or additional supports are required.

The pressure breakdown orifice can be used in any application where the system pressure needs to be reduced at a constant rate with a constant flow. A typical descale system can include the breakdown orifice for both pump bypass and header pre-fill applications.