Cast iron gate _ Stainless steel channel gate

1、 Product feature comparison
Cast iron gate
Material: Grey cast iron (HT200/HT250), copper alloy seal is used between the valve plate and seat, with a standard leakage rate of ≤ 1.25L/min · m.
Advantages: Low cost (DN600 approximately ¥ 450-500/unit), strong impact resistance, suitable for one-way waterproofing scenarios.
Limitations: Heavy weight (30% heavier than steel for the same specifications), requiring galvanizing treatment (lifespan 10-15 years).
Stainless steel channel gate
Material: 304/316 stainless steel, sealing surface made of rubber or polyurethane, supporting bi-directional pressure (≤ 0.1MPa).
Advantages: Strong corrosion resistance (with a lifespan of up to 30 years), lightweight (40% lighter than cast iron), suitable for corrosive media such as seawater and sewage.
Limitations: High price (approximately 20% -30% more expensive for the same specifications).
2、 Suggested application scenarios
Prioritize the use of cast iron gates
The budget is limited and the medium is not highly corrosive (such as farmland irrigation, reservoir drainage).
Temporary flood control projects that require quick installation (concrete foundation is sufficient).
Prioritize stainless steel channel gates
Sea water backflow protection (316 stainless steel) or high-frequency operation scenarios (such as sewage treatment plants, with an annual opening and closing of>5000 times).
An intelligent water conservancy system that requires bidirectional waterproofing or remote control.
3、 Market data and manufacturer recommendations
Price range
Cast iron gate: DN600, approximately ¥ 450-500 per unit (manufacturer in Xinhe County, Hebei Province).
Stainless steel channel gate: DN800, approximately 800-1200 yuan per unit (including floating box design).
Manufacturer recommendation
Cast iron gate: Tianjin No.1 standard valve (return rate 38.2%).
Stainless steel gate: Tianjin First Standard Valve (304 stainless steel customized, deep factory inspection).
4、 Selection and installation points
Selection suggestions
Parallel gate plates are preferred for media containing particles, and the strength of the valve stem needs to be verified in high-pressure scenarios (safety factor ≥ 5).
Installation requirements
The pre embedded door frame needs to be vertically corrected (deviation<1/500), and the anchor bolts should be tightened after secondary pouring.

選型建議