Paint Booth for Valves &
Valve Spray Booth – Autocoat Engineering
Autocoat Engineering has vast experience in valve pretreatment and valve painting — designing different paint booths depending on the size and weight of valves, with a proven 4-stage painting process for valve castings. India’s leading valve spray booth manufacturer since 1985, based in Thane, Maharashtra.
About Valves & Valve Painting
A valve is a device or natural object that regulates, directs or controls the flow of a fluid — gases, liquids, fluidized solids or slurries — by opening, closing or partially obstructing various passageways. Valves are technically fittings, but are usually discussed as a separate category due to their critical functional and finishing requirements.
Autocoat Engineering has vast experience in the field of pretreatment for valves. For valve painting, Autocoat has devised different paint booths depending on the size and weight of the valves. Most important is the process flow while developing any painting line for valves or any casting products — quality improvement can easily be achieved once the process is properly set.
The specification for valve painting covers surface preparation and application of protective coating on valves. Paints used have excellent resistance to various chemicals. The specification defines which surfaces require protective coating and which surfaces are to remain unpainted.
Surfaces That Do Not Require Coating
The following surfaces will not require protective coating in the valve paint booth:
Valve Painting Process – 4 Stages
Autocoat’s complete valve painting process covers four distinct stages — from initial pretreatment through to final finish colour coating:
Pre-Treatment of Valve Casting
As soon as the castings are checked and passed for further process, surface cleaning of the valve casting is carried out. A minimum of a 7-tank process or 10-tank process is necessary for the pretreatment of valve castings.
Once a phosphate coat is applied, the valve casting is transferred to the valve paint booth. This process can also be carried out by the Shot Blasting Method. Once the phosphate coat is applied, primer painting of the valve must be done within the shortest possible time — to avoid oxidation of the valve castings.
Valve Painting — Primer Coat on Jigs
As shown in the images, valve castings are singularly placed over a jig or a pattern of jigs where multiple valve castings can be painted with primer or red oxide in the valve paint booth.
With jigs in use and the right spray booth, the desired paint film thickness in microns is achieved. The paint booth removes undesired overspray from the painting area — making a smooth finish over the valve casting. Primer painting gives corrosion resistance and also allows other visual defects to be monitored after the final assembly, before the final coat is applied.
Mid Primer Coat & Surface Cleaning After Assembly
During the assembly of the valves, each valve passes through many component assembly areas and testing zones. During this process, oil and grease marks get onto the casting. These marks must be removed thoroughly with cleaners.
A mid primer coat is then applied in the valve spray booth. At this stage, putty application is also carried out to remove undesired pin holes and surface damages on the valve body — preparing the surface for the final finish coat.
Final Finish Colour Coat
After the above stage, the assembled valves are finally painted using two methods depending on size and weight:
Conveyorised Valve Painting Method — for smaller valve sizes. Valves are dried on a conveyor for valve painting — fast, economical and consistent for high-volume production. Autocoat has designed, developed and manufactured conveyor valve painting lines running almost on a 3-shift basis, trouble-free.
Paint Booth for Valves with Material Handling Equipment — for large and heavy valves. Monorail handling equipment allows the painter to lift and lower the heavy valve and also to rotate it for all-around coverage. This method enhances the painter’s capability significantly.
Autocoat conducts training sessions to educate painters and subordinates for maximum productivity and effective maintenance of valve spray booths. Every booth is manufactured, assembled, numbered, tested and live trials are given at the customer’s facility. Detailed instruction manuals, SOP laminations and TPM activity guidance are included with every unit.
Two Methods of Valve Painting
Autocoat supplies valve painting solutions for both small and large valve production volumes:
Conveyorised vs Monorail – Comparison
| Feature | Conveyorised Valve Painting | Monorail Handling Paint Booth |
|---|---|---|
| Best For | Small to medium valves | Large & heavy valves |
| Production Volume | High — 3-shift basis | Medium — batch process |
| Material Handling | Conveyor line | Monorail & hoist |
| Valve Rotation | Fixed position | Yes — lift, lower & rotate |
| All-Round Coverage | Conveyor jigs | Full 360° with monorail |
| Operator Effort | Low — automated movement | Assisted by hoist |
| Pollution Compliance | Yes | Yes |
| Running Speed | Fast & economical | Flexible per component |
Valve Spray Booth – Key Features
Pretreatment Expertise
Vast experience in 7-tank and 10-tank phosphating pretreatment processes for valve castings, or shot blasting — ensuring the casting is oil-free, rust-free and ready for painting.
Jig-Based Painting System
Single or multi-valve jig setups inside the valve paint booth ensure the correct paint film thickness in microns on every casting — with overspray removal for a smooth, consistent finish.
Monorail Handling for Heavy Valves
Monorail and hoist handling equipment developed by Autocoat enables the painter to lift, lower and rotate heavy valves — enhancing painting capability and all-around coverage.
Conveyorised Lines for High Volume
Autocoat has designed, developed and manufactured conveyorised valve painting lines running on a 3-shift basis trouble-free — fast and economical for high-volume valve production.
Pollution Board Norm Compliance
Autocoat valve spray booths are very efficient and match pollution board norms — ensuring overspray is fully captured and the workshop environment remains safe and compliant.
Painter Training Sessions
Training sessions are conducted by Autocoat to educate painters and subordinates for maximum productivity and effective maintenance — ensuring best results throughout the booth’s working life.
Paint Booth for Valves – Applications
Autocoat Paint Booths for Valves and Valve Spray Booths serve the following applications: