POWDER DISCHARGE & FEEDING
Star Valve
For a star valve enquiry, define the discharge duty rather than relying on the equipment name alone. A rotating pocket arrangement transfers bulk material from the inlet to the outlet; the required throughput, material behavior and pressure conditions determine the specification to review.
Start with the actual discharge problem
Describe whether the installation requires hopper discharge, feeding to downstream equipment or operation across a pressure difference. Include the upstream and downstream arrangement, not just the nominal inlet size.
Information for a comparable quotation
- Material, particle-size range, moisture and loose bulk density.
- Minimum, normal and maximum throughput with units.
- Temperature, pressure differential and continuous or intermittent duty.
- Inlet and outlet measurements, bolt pattern, installation height and drive position.
- Bridging, lumps, irregular discharge or wear observed in the existing installation.
Confirm limitations before selection
Do not assume that a star valve name establishes a pressure rating, dosing accuracy or compatibility with an existing valve. Ask for the proposed configuration and its agreed operating limits. Sticky material, irregular hopper supply or downstream restrictions also need review.
COMPARE BY DUTY
Star valve, rotary feeder or rotary airlock?
These names can describe overlapping equipment; they do not replace an operating specification. Compare the duty and interfaces rather than treating the names as guaranteed performance classes.
- Rotary feeder: review volumetric feeding requirements; mass output also depends on material density and pocket filling.
- Rotary airlock valve: identify the pressure differential and leakage requirements when pressure isolation matters.
- Customized rotary valve: provide measured interfaces where installation space or replacement dimensions are fixed.
Prepare the data before requesting a model
Use the capacity calculator for an initial estimate, then check the installation dimensions. A calculation is not a guarantee of output with your material. Follow the selection guide to assemble the complete operating data.
PROJECT FAQ
Questions before ordering
Is a star valve automatically suitable for pressure isolation?
No. State the pressure differential and leakage requirements so suitability can be reviewed for the proposed configuration. The equipment name alone does not establish a pressure rating.
Can I replace an existing valve using its inlet size only?
No. Provide the bolt pattern, inlet and outlet dimensions, installation height, drive position and operating conditions. Confirm compatibility on the agreed drawing.
What if hopper discharge is irregular?
Describe the material behavior, hopper arrangement and when the problem occurs. Irregular upstream supply or downstream restrictions may affect discharge and may not be resolved by changing the valve alone.