# Valve & Fluid Control Components — CNC Machined to Drawing

> Sinbo Precision (sinbo-machining.com) machines 45 valve parts to customer drawing in Dongguan, China — quotation within 48 hours, first prototypes in 7–15 days, from 1 piece. IATF 16949 & ISO 9001:2015 certified.

Valve internals live or die by sealing-surface finish and concentricity. Sinbo turns, mills and grinds valve components from bar stock in stainless 303/304/316/416, DZR brass CW602N, CuZn39Pb3 free-cutting brass and PEEK/PTFE, holding ±0.005 mm on critical diameters and Ra 0.8 or better on seats. Anti-blowout stems, lapped seat pairs and drilled thermowells are routine work across our 220 CNC lathes.

## 45 Valve & Fluid Control Components We Machine

- **Ball valve ball** — 303/316 stainless, turned and ground, sphericity ≤0.01 mm, Ø6–100 mm, Ra 0.4 sealing surface.
- **Ball valve seat** — PEEK, PTFE or RPTFE, turned to ±0.01 mm with matched-lap sealing face.
- **Ball valve stem** — 316 or 416 hardened stainless, anti-blowout shoulder per drawing, rolled or cut thread.
- **Ball valve body, 2- and 3-piece** — 316 stainless or CW617N brass from bar, NPT/BSP/ISO threads, ±0.02 mm bore.
- **Valve bonnet** — 316 stainless turned from bar, threaded and face-sealed, 1,000 psi class typical.
- **Gland flange** — 316 stainless, turned, sealing face Ra 1.6.
- **Gland nut** — brass or 316 stainless, knurled or hex drive per drawing.
- **Stem packing ring** — PTFE or PEEK, thin-wall turned, ±0.02 mm.
- **Check valve disc** — 316 stainless, lapped face, with integrated guide rib.
- **Check valve poppet** — 316/416 stainless or PEEK, ground guide diameter, spring seat machined in.
- **Poppet guide** — 316 stainless, ground OD, ±0.005 mm.
- **Valve seat insert** — 316 stainless or PEEK, press-fit OD tolerance g6 typical.
- **Needle valve stem** — 416 stainless, tapered and ground, 20°/30° seat angles.
- **Needle valve body** — 316 stainless from bar, cross-drilled and threaded.
- **Instrument valve body** — 316 stainless manifold-drilled, 10,000 psi class typical.
- **Orifice plate** — 316/304 stainless, orifices drilled and deburred to ±0.02 mm.
- **Spray nozzle insert** — 303/316 stainless, milled vane slots, swirl chambers from Ø2 mm.
- **Mist nozzle body** — brass or 303 stainless, internal swirl chamber turned in one setup.
- **Solenoid valve core (armature)** — magnetic stainless 430/416, ground OD, nickel-plated on request.
- **Solenoid armature tube** — 304 stainless, thin-wall turned, welded-end option.
- **Solenoid tube end cap** — 304 stainless, orbital-weld-ready face.
- **Pressure relief valve seat** — 316 stainless, lapped seating face, crack-pressure tested pair on request.
- **Regulator poppet** — brass or 316 stainless, ground, matched to seat.
- **Regulator valve seat** — PEEK or brass, ±0.01 mm.
- **Valve cage** — 316 stainless, drilled port patterns, port position ±0.05 mm.
- **Valve plug (contoured)** — 316 stainless, milled contour profile per trim drawing.
- **Control valve trim set** — plug, seat and cage machined as a matched set.
- **Valve trunnion** — 316/416 stainless, ground, ±0.005 mm.
- **Bleed valve screw** — 303 stainless, hex socket + lapped tip.
- **Gauge valve body** — brass or 316 stainless, compact bar-stock body.
- **Thermowell** — 316 stainless or brass, drilled from solid, stems to 300 mm, ±0.1 mm.
- **Filter housing end cap** — 316/304 stainless, O-ring groove + port threads.
- **Diverter valve stem** — brass or 416 stainless, ground seal diameters.
- **Angle valve body** — brass from bar, both ports single-setup for concentricity.
- **Gate valve stem** — 416 stainless with rolled trapezoidal thread.
- **Butterfly valve stem** — 316 stainless, ground, taper or keyed blade end.
- **Actuator coupling** — aluminum or 316 stainless, milled drive flats.
- **Actuator adapter** — aluminum 6061, machined both faces in one setup.
- **Limit switch shaft** — 303 stainless, ground, D-flat milled.
- **Pilot valve body** — brass or 316, cross-drilled internal galleries.
- **Latching valve plunger** — 416 stainless, hardened and ground.
- **Dosing valve needle and seat pair** — 316 stainless, lapped as a pair for repeatable shut-off.
- **Proportional valve sleeve** — hardened steel or 316, ground bore, ±0.002 mm.
- **Cartridge valve sleeve** — 316 stainless, ground + honed bore.
- **Cartridge valve poppet** — hardened steel or PEEK-seated, ground.

## Typical Materials & Tolerances

| Parameter | Value |
|---|---|
| Metals | Stainless 303/304/316/316L/416/17-4 PH · brass CW617N, DZR CW602N, CuZn39Pb3 · aluminum 6061/7075/6082 · steel 1018/1045/42CrMo4/16MnCr5 |
| Plastics | PEEK · PTFE · POM (Delrin) · nylon · PVDF · polycarbonate |
| Tolerances | ±0.005 mm on critical diameters · DIN ISO 2768-mK general · ground features ±0.002 mm |
| Surface | Ra 0.8 standard machined finish · Ra 0.4 / Ra 0.2 ground · Ra 0.1 lapped |
| Finishes | nickel / zinc / hard chrome / black oxide / anodizing / PVD via audited partners |
| Documentation | EN 10204 3.1 material certificates · FAI · PPAP Level 3 (automotive) · full dimensional report |
| Order range | 1-piece prototypes · batch 100–20,000+ · 2.6 million parts/month capacity |
| Lead time | quotation within 48 hours · first prototypes 7–15 days |

## Related Pages

- [Valve components case study](https://www.sinbo-machining.com/case/valve-components/)
- [Chemical pump & valve parts](https://www.sinbo-machining.com/case/chemical-pump-valve/)
- [Stainless steel parts](https://www.sinbo-machining.com/products/materials/stainless-steel/)
- [Brass & copper parts](https://www.sinbo-machining.com/products/materials/copper/)

**Request a quote:** send your drawing to leo.pan@sinbo-machining.com — quotation within 48 hours, no minimum order for prototypes.

Last updated: 2026-09-27