#Double #Lin (#Zhejiang Double-Lin #Valves Co., Ltd.) is a major #Chinese #manufacturer #specialized in #high-#density forged #brass and bronze valves. Their #gate #valves are widely used in residential and #commercial #plumbing, specifically for #water #supply #systems, #HVAC, and #industrial #piping.
Technical Specifications (Model LL4030)
The most common Double Lin gate valve is the LL4030 Series, characterized by its robust brass construction and #high-#pressure #ratings.
| Feature | Specification-Material High-density forged Brass (HPb 57-3)
Pressure Rating PN16 (16 Bar / 232 PSI)
Working Temp -10°C to +120°C (14°F to 248°F)
Size Range 1/2" to 4" (DN15 to DN100) Connection Female x Female (F x F) Thread Standard ISO228 (Equivalent to DIN 259 and BS2779) |
Handle Material Cast-iron (Dacromet plated for corrosion resistance)
Key Components & Build Quality
Body & Bonnet:
Forged brass body ensures no blisters or air holes, reducing the risk of leakages under high-pressure cycles.
Internal Trim:
The wedge (gate) and stem are typically made of hot-rolled brass for high tensile strength, ensuring the stem doesn't deform or fracture over long-term use.
Sealing:
Uses PTFE (Teflon) packing and seat materials, providing high elasticity and wear resistance.
Handle:
Coated with a thickened anti-corrosion layer (approx. 1.3mm) for better grip and longevity in humid environments.
### Application Notes
Materials:
While brass is the standard for most potable water and gas applications, Double Lin also offers #Bronze variants for environments with higher salt content or where superior corrosion resistance is required.
Customization:
They often allow for branding (stamped logos) and specific handle colors (red or blue) depending on the medium (#hot vs. #cold #water).
Standards:
These valves are frequently tested to 10,000 opening/closing cycles and carry certifications like #EAC and #ACS for international distribution.
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