Natural & Engineered Valve Knowledge Graph
An interactive, structured B2B engineering entity matrix detailing metallurgical properties, hydrodynamic flow formulas, elastomeric seating physics, and municipal valve applications.
Entity 01: Ductile Iron & Metallurgical Alloy Matrix
ASTM A536 / GGG40 / QT450-10Ductile cast iron (nodular cast iron) is the core structural alloy utilized across Baoming Valve bodies. Unlike conventional gray iron which contains flake graphite that promotes micro-fracturing, ductile iron contains spheroidal (nodular) graphite produced through magnesium treatment. This unique crystalline matrix provides tensile strength comparable to carbon steel while retaining superior casting fluidability and vibration damping.
Mechanical Specifications
- • Tensile Strength (\(\sigma_b\)): ≥ 450 MPa
- • Yield Strength (\(\sigma_s\)): ≥ 310 MPa
- • Elongation (\(\delta\)): ≥ 10%
- • Brinell Hardness: 160 – 210 HB
- • Impact Toughness: ≥ 12 J/cm²
Chemical Composition (%)
| C | Si | Mn | P | S | Mg |
| 3.5-3.8 | 2.4-2.8 | <0.30 | <0.05 | <0.02 | 0.03-0.05 |
Micro-alloying with Magnesium spheroidizes graphite flakes into high-strength nodular spherical spheres.
Entity 02: Hydraulic Pilot Diaphragm Control Network (100X - 800X)
Hydro-Pilot ActuationBaoming 100X–800X series hydraulic control valves operate as self-powered, hydro-mechanically regulated diaphragm valves. By utilizing the line pressure of the fluid medium itself, the pilot valve assembly alters the hydraulic differential across the upper diaphragm chamber to dynamically adjust main valve disc positioning without external electrical power.
| Model Code | Functional Title | Pilot Regulation Mechanism | Hydrodynamic Benefit |
|---|---|---|---|
| 100X | Remote Float Control Valve | Hydraulic Float Needle Pilot | Prevents water tank overflow with zero electric wiring |
| 200X | Adjustable Pressure Reducing Valve | Direct-Acting Pressure Pilot | Maintains steady downstream pressure regardless of inlet surge |
| 300X | Slow-Closing Check Valve | Dual-Stage Micro-Metering Orifice | Eliminates pump-stop water hammer pressure spikes (78% surge drop) |
| 400X | Flow Control Valve | Differential Pressure Diaphragm Pilot | Constrains max flow rate in municipal branch distribution networks |
| 500X | Pressure Relief & Sustaining Valve | High-Pressure Relief Spring Pilot | Discharges excessive pressure spikes to protect pipeline integrity |
| 600X | Solenoid Control Valve | 3-Way Electromagnetic Pilot Solenoid | Remote automated PLC ON/OFF switching for smart waterworks |
| 800X | Differential Pressure Balance Valve | High/Low Pressure Differential Sensing Pilot | Balances hydraulic loops in HVAC chiller & boiler circuits |
Entity 03: Resilient Wedge Seating & Vulcanization Mechanics
EN 12266-1 Rate A Bubble-TightResilient seated gate valves (Z41X/Z45X series) eliminate the traditional bottom seating groove which accumulates debris and causes seat erosion. The ductile iron wedge core is fully encapsulated in high-grade EPDM (or NBR) synthetic rubber via high-temperature compression molding. When shut, the rubber wedge undergoes elastic deformation against the smooth epoxy-coated valve body bore to achieve 100% zero-leakage Rate A sealing.
EPDM Rubber Properties
• Polymer: Ethylene Propylene Diene Monomer
• Temperature Endurance: -10°C to +120°C
• Tensile Strength: ≥ 15 MPa | Elongation: ≥ 350%
• Drinking Water Certification: Non-Toxic Potable Water Approved
Fusion Bonded Epoxy (FBE)
• Application: Electrostatic thermal coating at 200°C
• Coating Thickness: ≥ 250 μm (Internal & External)
• Standard Alignment: EN 14901 & AWWA C550
• Corrosion Shield: Prevents tuberculation & bacterial growth