Product Overview

The H76H Dual Plate Wafer Check Valve is specifically designed for water systems, featuring a dual-disc swing structure with quick closing, water hammer protection, and low pressure drop characteristics. Particularly suitable for water system pipelines in water supply/drainage, fire protection, and HVAC applications to effectively prevent medium backflow.

Core Advantages

• Fast Closing Technology– 0.3-0.8 second closing time effectively prevents water hammer
• Ultra-Low Flow Resistance– Streamlined structure reduces head loss by over 50%
• Compact & Lightweight– Length is only 1/4 of conventional check valves, 40% weight reduction
• Zero Leakage Seal– NBR/EPDM rubber sealing rings ensure complete sealing
• Corrosion-Resistant Design– Epoxy-coated body interior, stainless steel discs
• Flexible Installation– Supports horizontal, vertical and other installation methods
• Maintenance-Free Operation– No external moving parts, service life up to 10 years

Technical Parameters

Working Principle

The H76H Dual Plate Wafer Check Valve adopts a dual-disc swing structure. When water flows forward, water pressure pushes two semi-circular discs to rotate open around the shaft; when water stops or reverses, the discs close quickly under the combined action of self-weight + spring force + water pressure to prevent backflow. The specially designed damping device effectively reduces water hammer impact during closing.

Structural Features

• Dual-Disc Structure– Two semi-circular discs arranged symmetrically for fast, smooth closing
• Damping Device– Built-in hydraulic damper effectively absorbs closing energy
• Wear-Resistant Bushings– Self-lubricating bearings ensure over 100,000 open/close cycles
• Corrosion-Resistant Design– Epoxy-coated body interior provides excellent corrosion resistance
• Easy Maintenance– Top inspection port facilitates internal examination

Typical Applications

• Water Supply & Drainage Systems: Water treatment plants, sewage plants, secondary water supply
• Fire Protection Systems: Hydrant systems, sprinkler systems
• HVAC Systems: Chilled water, cooling water circulation systems
• Industrial Water Circulation: Cooling towers, process water systems
• Agricultural Irrigation: Large-scale sprinkler systems

Installation & Maintenance

Professional Installation Guide

• Before installation, confirm valve flow direction marking matches water flow direction
• For horizontal installation, ensure disc shaft is level
• For vertical installation, water must flow upward
• Maintain straight pipe sections of ≥5×pipe diameter before and after valve

Scientific Maintenance Plan

• Quarterly Inspection: Check disc opening/closing flexibility
• Annual Maintenance: Inspect sealing ring wear
• Long-Term Shutdown: Keep valve fully open
• Troubleshooting: If leakage occurs, check sealing surfaces and springs

Selection Guide

1. Determine pipeline nominal diameter (DN or inches)
2. Select pressure rating (PN or Class)
3. Choose body material (ductile iron/carbon steel) based on water quality
4. Determine sealing material (NBR/EPDM)
5. Select flange standard (GB/HG/ANSI, etc.)

Important Notes

• Do not install in reverse flow direction
• For vertical installation, only upward flow configuration is permitted
• For systems prone to water hammer, consider installing additional damping devices
• Always maintain recommended straight pipe sections before/after valve