LH45X-16 Flow Limiting Check Valve

LH45X-16 Flow Limiting Check Valve is an integrated dual-function pipeline protection valve specially designed for water pump outlet pipelines. It is widely used in municipal water supply, building water supply, fire protection pump rooms, water treatment stations and industrial circulating water systems. This valve combines flow limiting and one-way shutoff performance. It can restrict the maximum flow during pump startup and prevent medium backflow when the pump stops, effectively protecting water pumps from overload damage and reducing pipeline water hammer impact.

The valve body is cast from high-strength ductile iron with excellent pressure resistance and impact toughness, rated pressure PN16. Flanged connection ensures stable assembly and convenient maintenance. The internal structure adopts inclined disc design with built-in flow limiting mechanism and elastic rubber sealing surface. When the pump starts, the valve disc can only open within a preset maximum flow range to avoid excessive starting current causing overload of pump motor. When the pump stops and backflow occurs, the valve disc closes rapidly to block reverse flow and protect pump impeller.

The built-in flow limiting structure can limit the flow below the set threshold. Users do not need to install separate flow limiting valves on the pipeline, simplifying pipe layout and lowering overall engineering costs. The soft sealing structure realizes reliable shut-off and low leakage. The valve stem is made of stainless steel with wear-resistant packing to prevent medium leakage. Standard specifications cover DN50 ~ DN600. Applicable medium is clean water such as tap water, fire service water and circulating water, working temperature between 0℃ ~ 80℃.

Installation and operation notes: Installation direction must comply with the flow arrow marked on valve body. It is recommended to install horizontally at pump outlet. Avoid long-term operation under extreme pressure fluctuation. Regular inspection should check the aging condition of rubber sealing surface and ensure flexible opening and closing of the valve disc. This valve cannot be used as a shut-off valve for long-term pipeline isolation.

All finished valves pass strict shell hydrostatic test, sealing test and flow limiting performance test before delivery. Each unit is inspected to verify stable limiting effect and reliable one-way sealing. Compared with the scheme of separate installation of check valve and flow limiting valve, LH45X-16 saves installation space, reduces pipeline accessories and shortens construction cycle.

With integrated flow limiting and non-return function, compact structure, convenient installation and reliable protection for water pumps, LH45X-16 Flow Limiting Check Valve has gained wide recognition by engineering contractors. It is extensively adopted in residential communities, commercial buildings and municipal water supply pump stations. Our factory can support different flange standards and customized anti-corrosion coatings to satisfy diversified procurement demands of water supply engineering projects.