Precision Stainless Steel
Valves & Components
for Critical Industries.
From high-purity pharmaceutical valves to high-pressure pipeline fittings — Zetu Machinery casts, forges, machines and finishes precision metal components for OEM buyers worldwide.
“Creating value that increases customers' competitiveness.”
A focused specialist — not a general trading company.
Valve & Precision Specialists
Stainless steel valves and precision components are our core — not a sideline. Silica-sol investment casting, forging and machining under one roof.
Built for Critical Industries
Pharmaceutical, oil & gas, and chemical buyers trust us with pressure-rated, high-purity parts. ISO 9001 and PED certified.
Documented Quality
98%+ first-pass yield. CMM verification, tensile and hardness testing, optical projection — with material and inspection reports on request.
Proven Export Partner
90% of what we make ships to the US and EU. 15+ years of international trade experience and an English-speaking technical team.
Precision valves, fittings & engineered components.
High-Purity Stainless Steel Valves
Forged A182-F316L
- • Sizes 1/2" – 4"
- • Ferrite content 0.5% – 1%
- • Sulfur content 0.005% – 0.017%
- • Surface Ra 0.8 / bore Ra 0.4
Application: Pharmaceutical & hygienic process systems
High-Pressure Valve Fittings
A105 carbon steel
- • Sizes 1/2" – 2"
- • Surface Ra 0.8
- • Bore Ra 0.4
- • Pressure-rated
Application: Oil, gas & petrochemical pipelines
Stainless Steel Valves & Valve Bodies
304 / 304L / 316 / 316L
- • Silica-sol investment casting + forging
- • Sizes 1/2" – 4"
- • Industrial & commercial grade
Application: Industrial valves, fluid control assemblies
Iron & Steel Castings
Steel · Ductile iron · Grey iron · Copper
- • Silica-sol & water-glass investment casting
- • Coated-sand & clay-sand casting
- • Machined-ready blanks
Application: Pumps, valve bodies, structural castings
Forged Components
Stainless steel · Aluminum · Carbon steel · Copper
- • 120T – 2,000T press range
- • Open-die & closed-die
- • Heat treatment included
Application: High-strength structural & pressure parts
Aluminum Castings
Aluminum alloy
- • Low-pressure casting
- • Gravity die casting
- • Sand casting
Application: Housings, brackets, lighting & equipment bodies
Five core processes. One accountable partner.
Casting Services
Silica-sol investment casting, water-glass casting, sand casting, and aluminum / zinc die casting — from drawing to machined-ready part.
- • Silica-sol (lost-wax) investment casting
- • Water-glass & coated-sand casting
- • Stainless steel 304 / 304L / 316 / 316L
- • Ductile iron, grey iron, copper alloys
CNC Machining
Precision CNC milling and turning on 32 machines — tolerance to ±0.01 mm (0.0004 in), surface finish to Ra 0.4.
- • 13 CNC machining centers
- • 16 precision CNC lathes
- • 3 imported high-precision CNC machines
- • Tolerance to ±0.01 mm (0.0004 in)
Forging Services
Open-die and closed-die forging from 120T to 2,000T — stainless steel, aluminum, carbon steel and copper.
- • 120T – 2,000T press range
- • Stainless steel & carbon steel forging
- • Aluminum & copper forging
- • Heat treatment & post-machining
Stamping & Fabrication
Metal stamping, welding, and fabricated assemblies in stainless steel, mild steel and aluminum.
- • Metal stamping & pressing
- • MIG / TIG / spot welding
- • Sheet metal fabrication
- • Stainless, mild steel & aluminum
Finishing & Coating
Powder coating, wet paint, electroplating, electrophoresis (e-coat) and polishing — protected, color-matched parts.
- • Powder coating & wet paint
- • Electroplating
- • Electrophoresis (e-coat)
- • Polishing & surface refinement
Assembly & Logistics
From single component to ready-to-ship sub-assembly — packaged, palletized and DDP-delivered.
- • Welding & sub-assembly
- • Custom packaging & labeling
- • EXW / FOB / CIF / DDP
- • Worldwide shipping support
Trusted by buyers across demanding industries.
Pharmaceutical & Hygienic
High-purity F316L valves and fittings with polished Ra 0.4 bores for sterile process systems.
Oil, Gas & Petrochemical
A105 high-pressure valve fittings and pressure-rated components for pipelines.
Chemical Processing
Corrosion-resistant stainless steel valve bodies, pumps and fluid-control parts.
Power & Energy
Cast and machined components for power generation and energy infrastructure.
Automotive
Die-cast, forged and machined components for automotive systems.
Marine & Heavy Industry
Castings, forgings and fittings for shipbuilding, railway, mining and food equipment.
A 3,000 m² plant. 32 CNC machines. Round-the-clock production.
Machining Floor
- • 13 CNC machining centers
- • 16 precision CNC lathes
- • 3 imported high-precision CNC machines
- • 3-shift, 24-hour production
Casting & Forging
- • Silica-sol & water-glass investment casting
- • Ductile & grey iron casting lines
- • Aluminum / zinc die casting 180T–1,800T
- • Forging 120T–2,000T
Quality Lab
- • CMM / three-coordinate measurement
- • Tensile strength & hardness testers
- • Optical projector & roughness testing
- • 8 dedicated QC staff
Strive for excellence — refine every detail.
ISO 9001 & PED certified · Material and inspection reports on request.
15+ years of casting, forging & machining expertise.
Ningbo Zetu Machinery Co., Ltd. is a manufacturer of precision stainless steel valves, fittings and engineered metal components — serving pharmaceutical, oil & gas, chemical, power and industrial customers worldwide.
Our team has built precision parts together since 2008, growing a Ningbo workshop into a 3,000 m² plant with 70+ staff and round-the-clock production. Founding Zetu lets us serve global OEM buyers directly — with faster engineering response and transparent pricing.
Our promise: we only ship products our customers are satisfied with.
“Creating value that increases customers' competitiveness.”
Read our full story →- Legal Entity
- Ningbo Zetu Machinery Co., Ltd.
- Heritage
- Since 2008
- Facility
- 3,000 m² plant
- Team
- 70+ skilled staff
- Certifications
- ISO 9001 · PED
- Headquarters
- Yinzhou, Ningbo, China
Send your drawing.
Get pricing & lead time in 24 hours.
Upload a 2D / 3D file or describe your part. Our engineers will respond with a DFM review, quote, and lead time within one business day.