A spillback nozzle is a type of whirl nozzle that is equipped with two connections instead of the single inlet on most traditional whirl nozzles.
Spillback nozzles are special single-fluid nozzles that atomize liquids into a fine hollow cone spray. In comparison to traditional single-fluid nozzles, spillback nozzles ensure consistent droplet size over the entire controlled flow range without changing pump pressure. These nozzles can lower operating cost because they do not require compressed air. Spillback nozzles are used for gas cooling and conditioning processes commonly found in chemical processing, petrochemical, pollution control, and cement industry.
BETE spillback nozzles and lances are made in the USA with quick delivery times for replacement nozzles. Our customer-focused designers, applications engineers, and sales team work with you to find the best spraying solution for improving your process performance.
DESIGN FEATURES
High turndown ratio 10:1
Minimal variation in drop size over operating flow range
Cap nut design is CFD proven and less prone to clogging and build-up
Requires less maintenance and cleaning
Highly reliable in extreme environments
Pressure changes have minimal effect on spray angle stability
Single fluid design requires no compressed air
Made in USA
AVAILABLE CONNECTION TYPES
• 3/4”, 1”, and 2”
MATERIALS
• Hardened 420SS, 316SS
• Gaskets 316SS
SPILLBACK NOZZLE DESIGN
Fluid enters the swirl chamber in the fluid cap through angled holes in the swirl component that impart a tangential velocity to the fluid. As the fluid exits the fluid cap orifice, the tangential velocity creates a cone pattern and atomization of the fluid.
Spillback nozzles achieve a 10:1 turndown ratio of the injection flow rate by diverting a portion of the inlet flow through an internal return line. Return flow is controlled using a spillback valve in the return line to adjust the return flow rate. An increase in flow rate through the return line results in a decrease in injection flow rate through the orifice. A constant supply pressure maintains liquid velocity through the internal swirl disk component, providing relatively constant atomization throughout the flow range.
As the injection flow to the process decreases, the required pump supply flow to the inlet increases. Proper sizing of the pump is critical to operating performance.
SPILLBACK REQUIREMENTS
From process engineering and nozzle selection assistance to implementing automated spraying systems, BETE can customize the system design to fit your operational needs and requirements.
- A basic setup requires a reservoir, pump, spillback valve, and piping to fit up to the nozzle.
- Spillback nozzles operate on a direct-pressure atomization principle but with a return line feature that allows a portion of the pumped fluid to be returned to the supply tank.
- The return line feature utilizes a spillback control valve to vary the amount of fluid returned from the nozzle, which provides high turndown ratios of approximately 10:1.
- High-pressure operation and constant feed pressure allow for fine atomization with relatively little variation in droplet size over the operating flow range of a nozzle.
- NOTE: As the injection flow to the process decreases, the required pump supply flow to the inlet increases.
Video(s)
Spillback Nozzle Video
Resources
Spillback Catalog Datasheet
Download PDF
Spillback - Metric Catalog Datasheet
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Spillback Manual
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Spillback Lance Inquiry Sheet
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