blind flange 6 & blind flange 12 for plumbing pipeline | Factory

Mark R.
Purchasing Manager, Texas Water Utility

"We ordered 350 pcs of blind flange 6 Class 150 and 120 pcs of blind flange 12 Class 150 for a municipal water expansion. Weihuan delivered in 24 days, 12 days faster than our previous US supplier. The EN 10204 3.1 docs were perfect for our audit trail."

Stefan L.
Technical Director, Dutch Chemical Plant

"The surface finish on their blind flange 12 units measured 2.9 µm Ra on our profilometer — even better than the 3.2 µm spec. No gasket leaks after our 450 psi hydro test. We now put them on our approved vendor list."

Ahmed K.
Mechanical Engineer, UAE Oilfield Services

"We compared pricing from 5 suppliers for 6" 300# RTJ blind flanges. Weihuan was 22% cheaper than a European trading house, and the RING groove accuracy passed a liquid penetrant test with zero indications."

Yes, provided the material grade is matched to the fluid. For clean water and HVAC, ASTM A105 carbon steel with a standard RF face is sufficient. For chlorides, acids, or high-purity water, use ASTM A182 F316 stainless steel to resist pitting and stress corrosion cracking. Always verify chemical compatibility with your process engineer.

For 500 pcs of blind flange 6, Class 150 in A105, our standard production cycle is 15–20 working days after steel confirmation. For Class 300 or stainless products, add 5–7 days. OEM custom embossed logos require an additional 2 days.

Yes. Every shipment can include EN 10204 3.1 inspection certificates with mill heat numbers, chemical analysis, tensile and impact test results. Third-party inspection by SGS, BV, or TÜV is also available at cost.

We machine the raised face to a serrated finish of 3.2 µm Ra (concentric grooves), verified by surface profilometer on every production lot. We also offer 100% hydrostatic testing up to 1.5× the rated working pressure, so you install a flange that is pre-validated for sealing.

We consolidate your order with other fittings to maximize container utilization. For 12" blind flanges, stacking and palletizing are designed to prevent bolt-hole deformation. We provide DDP (Delivered Duty Paid) quotes for US and EU ports through our freight partners.

Absolutely. We routinely produce custom blind flanges with special bolt circles, non-standard thicknesses, facing types (RTJ, tongue and groove), and tapped vent holes per customer drawings. Just send your 2D/3D drawing or sample.

Yes. Many plumbing distributors combine blind flange 6, blind flange 12, elbows, tees, and reducers in a single container. We'll prepare a packing list with line-item weights to help you minimize clearing costs.

You'll get a dedicated sales engineer who can guide bolt torque values, gasket selection, installation sequence, and troubleshooting. If any dimensional non-conformity is validated, we replace the batch at our cost, including freight.