Fixed-Valve Trays
Fixed-valve tray assemblies selected for the process duty and operating envelope. ATTOMO can supply fabrication to an agreed tray design and material specification.
Process and equipment approach
Fixed valves form stationary openings in the tray deck. Their geometry directs vapour into the liquid without the moving elements of a floating-valve tray. Capacity, pressure drop, operating range and fouling behaviour depend on the actual design and service.
Applications and product requirements
Fixed-valve trays use stationary vapour openings or formed valve features to direct vapour into the tray liquid. They can be assessed for new columns or revamps where their hydraulic behaviour suits the service. The valve geometry remains fixed as the vapour load changes.
Equipment and operating approach
The valve geometry influences vapour discharge, liquid contact and the usable load range. Opening area, liquid-flow path, weirs, downcomers and tray spacing still govern overall performance. Larger openings may be useful for certain fouling duties, but suitability depends on the actual solids, deposits and operating conditions.
Simplified equipment illustration — not a fabrication drawing or project photograph.
Define the right package.
The quotation defines the included equipment, services and battery limits.
- Fixed-valve decks and tray assemblies
- Liquid-handling and support components
- Installation hardware as specified
- Material and fabrication documentation
Materials and configuration
A fabricated package can define valve decks, panels, supports and liquid-handling parts. Material and thickness must meet the corrosion and mechanical basis. Where a proprietary geometry is specified, design ownership and supply rights must be established. Site measurements and panel access are essential for replacement trays.
Utilities and operation
Submit minimum, normal and maximum vapour and liquid loads, allowable pressure drop and fouling information. Compare capacity and efficiency against a common design basis. Fixed construction removes the valve-lift mechanism but does not eliminate the need for inspection, cleaning or checks for corrosion and deposits.
Information for your enquiry.
Share the information you already have. Early-stage enquiries are welcome.
- Vapour and liquid operating cases
- Fouling and corrosion conditions
- Column dimensions and support details
- Pressure-drop and maintenance requirements
Frequently asked questions
Do fixed-valve trays have moving valves?
No. The openings are formed by stationary features in the deck. Floating-valve trays use movable valve elements.
Does a fixed-valve design eliminate fouling?
No. Geometry may help a particular duty, but fouling depends on the stream and operating conditions. Maintenance and cleaning still need consideration.
What operating data are needed to select a fixed-valve tray?
Provide minimum, normal and maximum vapour and liquid loads, fluid properties, operating pressure, allowable pressure drop and fouling information. These inputs establish the hydraulic design basis.
What is needed for a replacement fixed-valve tray quotation?
Send existing drawings, shell dimensions, tray spacing, support details, access restrictions, material specification and required quantities. Identify whether the replacement retains the existing process duty or forms part of a capacity change.
Can a fixed-valve tray be fitted in an existing column?
Possibly, after reviewing shell dimensions, supports, flow cases and pressure-drop limits. Confirm the installation arrangement and the responsibility for process performance.