Overview

A valve plate etching service produces the flat ported plates that sit between a valve seat and a reed or disc, where every port edge and every sealing land has to be right the first time. Photochemical machining removes the blanking burr entirely: because metal is dissolved rather than sheared, the port rim comes out square and burr-free, and a reed can close on it without rocking on a ridge of displaced material. On a compressor or pump, that single detail decides whether the plate seals at low lift or leaks by a few cubic centimetres per stroke.

The process also frees the port geometry from tooling. A stamped plate needs a die for each port pattern, and corners have to stay generous enough for the die to survive; an etched plate can carry radiused or tapered ports, metering slots, half-etched relief pockets and stiffening ribs on one sheet, with the same edge quality at every opening. Spring steel 301 and 302, stainless 304/316L and brass are all processed, typically between 0.1 mm and 1.0 mm, with flatness held after a stress-relief anneal so the plate seats without preload.

Parameter Window

• Available Materials: spring steel 301/302, stainless steel 304/316L, brass H62, nickel-plated steel
• Material Thickness Range: 0.1–1.0 mm
• Tolerance: ±0.05 mm on profile, ±0.03 mm on port position, flatness 0.02 mm per 20 mm after anneal
• Minimum Feature: 0.15 mm port slot at 0.2 mm stock, 0.2 mm ligament between ports
• Surface Options: as-etched and deburred, passivation, stress-relief anneal, MoS2 or PTFE coating, tumble polish
• Compliance: ISO 9001 process control, RoHS/REACH material traceability

Manufacturing Process / Workflow (8 Steps)

1. Flow path review — Check port area, land width and corner radii against the flow curve, and flag any corner sharp enough to concentrate fatigue stress.
2. Material and temper selection — Match spring temper to the lift and cycle count; 301 full hard for high-cycle reeds, 304 for corrosive media, brass for low-load seats.
3. Cleaning and lamination — Degrease and laminate both faces, keeping film thickness even so the port wall does not taper to one side.
4. Double-sided exposure — Register top and bottom film to shared targets so ports stay concentric through the thickness and the seat face stays true.
5. Development — Open port and profile areas, then inspect for residual film that would shrink a metering slot or leave a nodule on the seat.
6. Etching — Spray both faces with chemistry matched to the alloy; time and conveyor speed set port depth and edge squareness.
7. Stress relief and flattening — Anneal etched spring steel to release rolling and etching stress, then flatten between platens to the called-out bow.
8. Inspection and packing — Measure port area, land width, burr height and flatness, and keep a coupon from each lot for bend-fatigue reference.

Core Advantages

1. Burr-free seat face: There is no sheared lip to hold the reed off its seat, so low-lift sealing is repeatable without a secondary deburring operation.
2. Port geometry without die limits: Radiused corners, tapered throats, metering slots and half-etched pockets all etch in one pass, letting the flow path follow the simulation instead of the die.
3. No work hardening: Chemical removal leaves no cold-worked layer and no micro-cracks at the port rim, so high-cycle reeds start from a clean fatigue surface.
4. Flatness after anneal: Stress-relieved plates seat without preload, which keeps crack pressure and opening lift inside the designed window.
5. Variants at no tooling cost: A changed port pattern is a changed film, so a family of plates for different displacements can be sampled in days.
6. Single-piece traceability: Each plate is etched on a panel with a lot coupon, so thickness, temper and etch depth can be traced back through the valve plate etching service record.

Typical Applications

• Compressor reed valves: Discharge and suction reed plates with 0.2–0.5 mm ports, where the seat must stay flat over millions of cycles.
• Hydraulic valve plates: Ported plates for directional and pressure-control cartridges, with metering slots etched to ±0.03 mm.
• Pump check valves: Flapper seat plates in diaphragm and piston pumps, burr-free so the elastomer seals without nibbling.
• Pneumatic solenoid plates: Multi-port plates with half-etched cross-drill relief, replacing several stacked shims.
• Automotive transmission plates: Separator and valve body plates with fine control orifices and stiffening ribs on one sheet.
• Appliance and HVAC valves: Compact brass or stainless plates for gas and water valves, where cost per port matters more than absolute precision.

Design Notes & Process Considerations

1. Land width: Keep the sealing land at 1.0–1.5 × material thickness and never below 0.4 mm, or the reed will bridge the port and fret the edge.
2. Corner radius and fatigue: Inner corners are stress raisers; specify a radius of at least 0.3 mm, or a half-etched relief, when the plate flexes in service.
3. Port throat shape: A tapered or radiused throat raises the flow coefficient, but the taper has to be declared, because two-sided etching gives a straighter wall than single-sided.
4. Temper and anneal: State the temper on the purchase drawing and ask for anneal after etching; unannealed 301 will curl and lose its flat seat.
5. Flatness and burr limits: Give bow per 20 mm and a burr ceiling, typically 0.01 mm, and name the inspection face so both sides agree.
6. Coating compatibility: MoS2 or PTFE coatings hide edge quality, so approve the etched edge before coating; on a valve plate etching service order, that sequence avoids scrap at the last step.