Ductile iron gate valves are the preferred valve for DN150 municipal water pipelines due to their high strength, corrosion resistance, and low cost. Grade QT450-10 ductile iron offers tensile strength twice that of gray iron. With internal and external non‑toxic epoxy coating (≥0.3mm), it resists rusting for 30 years in buried service.The main gate valves product names of China gate Valve Network include:API Sprocket Lug&wafer Knife-shaped Gate Valve,API Electric Lug&wafer Knife-shaped Gate Valve,API Bevel Gear Lug&wafer Knife-shaped Gate Valve,API Pneumatic Lug&wafer Knife-shaped Gate Valve,API Cryogenic Gate Valve,API Flange Gate Valve,Bevel Gear Slurry ValveElectric Rising Stem Double Disc Parallel Gate Valve,Electric Non-rising Stem Single Disc Wedge Gate Valve

2026 Price Reference (USD, ex‑works)

Non‑rising resilient seated gate valve Z45X-16Q: 

67–90/pc,bulk(10+pcs)58–78

Rising stem gate valve Z41X: $72–97

83–118Pricesvarybybrand,coating,andactuation.Topbrandscost15–25210–420.

Key Selection Parameters

Size: DN150 (6″, pipe OD 168mm), pressure PN10/PN16

Design: Non‑rising stem (Z45X) saves pit height – highly recommended for buried networks; rising stem (Z41X) for above‑ground

Seat: EPDM rubber, bubble‑tight shut‑off, meets GB/T 17219 drinking water standard

Internal coating: Non‑toxic epoxy electrostatic spray, smooth with no leachates

Connection: Flanged to GB/T 17241.6 or GB/T 9113 – must match pipeline flanges

Operation: Handwheel standard; electric or gear available

Installation & Maintenance Tips

Leave ≥450mm clear length inside the pit; use EPDM gasket, tighten bolts crosswise.

Cycle fully open/close every 6 months to prevent seat sticking.

Check stem packing annually – minor leaks can be stopped by tightening gland nuts.

Common issues: incomplete closure (flush debris by cycling), stuck handwheel (apply rust‑penetrating lubricant).

Bottom line: A DN150 ductile iron non‑rising resilient seated gate valve costs $67–90 per piece. Choose EPDM seat + non‑toxic epoxy coating, and it will serve your water network reliably for 30 years.

Do you still need to know or purchase the following gate valve products: