Main Structural Classifications
1. By Gate Type
• Wedge Gate Valve: Single gate with wedge seal, excellent sealing performance, resistant to high temperature and pressure, most commonly used.
• Parallel Double Gate Valve: Suitable for low-pressure, normal-temperature water and steam media, wear-resistant and durable.
2. By Stem Structure
• Rising Stem Gate Valve: Exposed stem for easy identification of opening and closing status, corrosion-resistant and long service life.
• Non-exposed Stem Gate Valve: Stem not exposed, small footprint, mostly used for water supply and drainage, and underground pipelines.
3. Sealing Type
• Hard Seal: Metal seal, resistant to high temperature and pressure, wear-resistant, suitable for steam, oil, and high-temperature conditions.
• Soft Seal: Rubber/PTFE seal, zero leakage, corrosion-resistant, mostly used for sewage and tap water.
Core Advantages
1. Minimal flow resistance, straight internal passage without bends, low energy consumption for media transport;
2. Bidirectional sealing, usable in both forward and reverse flow directions, easy installation;
3. No media erosion of the sealing surface when fully open, long service life of the sealing surface;
4. Simple structure, low failure rate, easy maintenance, and wide range of applicable diameters.
Common Materials and Parameters
• Valve Body: Cast iron, ductile iron, WCB carbon steel, 304/316L stainless steel
• Pressure: PN10, PN16, PN25, PN40; Class 150~300
• Temperature: Soft seal ≤120℃, hard seal up to 425℃+
• Connection Methods: Flange, threaded, welded, wafer
Applicable Operating Conditions
Suitable for pipeline switching of pure, particulate-free media:
• Municipal water supply and drainage, fire protection, tap water projects
• Power plant steam, heating networks, oil and gas transmission
• Petrochemical, HVAC, compressed air, clean water, oil pipelines
