Product Overview

The H44H Swing Check Valve is a check valve with single-disc swing structure, which opens and closes through the rotational movement of the disc. It features low flow resistance, reliable sealing, and long service life. Widely used in large-diameter pipeline systems in petroleum, chemical, power, and other industries to effectively prevent medium backflow.

Core Advantages

• Low Flow Resistance Design– Full bore structure with flow resistance coefficient of only 0.2-0.5
• Reliable Sealing Performance– Metal hard seal structure with leakage class up to ANSI Class IV
• High Pressure & Temperature Resistance– Withstands up to PN100 pressure and temperatures up to 425℃
• Wear-Resistant Design– Self-lubricating bearing for disc sleeve extends service life by 5 times
• Easy Maintenance– Removable bonnet design facilitates internal inspection
• Multiple Material Options– Carbon steel, stainless steel, alloy steel, and other materials available
• Flexible Installation– Can be installed horizontally or vertically (medium flows upward)

Technical Parameters

Working Principle

The H44H Swing Check Valve operates on the single-disc swing principle: When medium flows forward, fluid pressure pushes the disc to rotate open around the shaft; when medium stops or reverses, the disc quickly returns to the seat under the combined action of its own weight + medium pressure + counterweight, achieving sealing. The specially designed damping device effectively reduces closing impact.

Structural Features

• Swing Structure– Disc rotates around shaft for smooth operation
• Damping Device– Built-in hydraulic damper reduces closing impact
• Wear-Resistant Sleeve– Self-lubricating bearing ensures long-term flexible rotation
• Counterweight Design– Adjustable counterweight balances disc closing force
• Easy Maintenance– Bolted bonnet connection facilitates disassembly and inspection

Typical Applications

• Petrochemical Industry: Crude oil, refined oil transmission pipelines
• Power Industry: Boiler feedwater systems, steam pipelines
• Chemical Industry: Various corrosive medium pipelines
• Water Supply & Drainage Systems: Large water plants, wastewater treatment plants
• Industrial Systems: Compressed air systems, process pipelines

Installation & Maintenance

Professional Installation Guide

• For horizontal installation, ensure the disc shaft is level
• For vertical installation, medium must flow upward
• Before installation, confirm the valve’s flow direction markingmatches medium flow
• Maintain ≥5DN straight pipe sectionsbefore and after the valve

Scientific Maintenance Plan

• Monthly Inspection: Check disc opening/closing flexibility
• Quarterly Maintenance: Inspect sealing surface wear
• Annual Maintenance: Disassemble to inspect internal components, replace worn parts
• Abnormal Handling: If leakage is found, immediately check sealing surfaces