FACTORY VERIFICATION
See the plant before you sign the PO.
We open our workshops, QC lab and certification records to every serious buyer — on-site, by live video, or through a third-party inspection body of your choice. No appointment gatekeeping, no staged photos.
50+
YEARS
Continuous valve manufacturing since 1975 — three generations of engineers and workers who know the product inside out.
400+
Employees
A full in-house team covering casting, machining, assembly, and QC — nothing outsourced to unverified subcontractors.
15+
Valve Series
From steam traps to gate, butterfly, and pressure reducing valves — one factory audit covers our entire product range.
20+
Countries Exported
Verified performance across 20+ countries — references and shipping records available on request.
Raw Material Procurement
Gaoshan controling the quality of the valve at source. Raw Material must be inspected every time, only in accordance with the requirements of national standards before warehousing. Gaoshan can supply Cast Iron, Ductile Iron, Carbon Steel, Forged Steel, Stainless Steel, Molybdenum Steel, Duplex stainless steel and so on.
Casting Line
We have our own casting line. chemical and physical analysis should be carried out to meet the national standard before casting.And keep the material sample for 10 years, so as to guarantee the valve quality better.Our casting line can not only control the quality, but also reduce the production costs.
Assembling & Inspections
All valves manufactured by Gaoshan are assembled and inspected in our factory.
Each valve shall be inspected and pressure tested after assembly. We use different media for different valves such as steam, water, compressed air and so on. Only qualified products will be sent to paint shop.
