LD-017 Hydraulic Door Closer & Floor Spring Assortment | Factory Wholesale Supplier

This hydraulic door closer and floor spring assortment provides automatic door control for commercial, residential, and institutional applications where smooth, controlled closing is essential. The hydraulic oil damper system eliminates door slamming while the two-stage speed adjustment independently controls sweep and latch speeds for quiet, secure closure every time.

The die-cast aluminum body withstands over 500,000 operating cycles without wear, significantly outperforming plastic-bodied competitors that crack and leak after extended use. The in-house hydraulic oil formulation maintains consistent viscosity from -30°C to +60°C, ensuring reliable operation in climates from arctic to tropical. Floor spring models support heavy glass and metal doors up to 300kg with cast iron bodies that absorb vibration and prevent walking. Fire-rated options with electromagnetic hold-open release integrate with alarm systems for code-compliant emergency egress. EN 2 through EN 6 closing force options match every door weight from lightweight residential interior doors to massive commercial entrance doors. OEM branding, custom colors, and smart sensor integration support wholesale and specification programs.

• Hydraulic oil damper provides smooth controlled door closing without slamming
• Two-stage speed adjustment for latch and sweep control
• Hold-open function keeps door open for traffic and ventilation
• Floor spring supports heavy glass and metal doors up to 300kg
• Backcheck prevents wall damage from forced opening
• Fire-rated options available with electromagnetic release

• Commercial building entrance and corridor doors
• Hotel lobby and restaurant kitchen doors
• Hospital and clinic patient room doors
• Residential apartment and office interior doors
• Fire-rated emergency exit doors

• In-house hydraulic oil formulation tested to -30°C to +60°C temperature range
• Die-cast aluminum body (not plastic) withstands 500,000 cycles
• Floor spring cast iron body absorbs vibration from heavy doors
• Custom closing force EN 2-6 available for different door weights
• Electromagnetic hold-open compatible with fire alarm systems