Micro-resistance slow-closing check valves are industrial valves used for pipelines carrying clean water, wastewater, seawater, and other media. Their core function is to prevent backflow of the medium and mitigate water hammer impacts, ensuring the safety of the pipeline system. The structure consists of a valve body, semi-circular valve disc, return spring, oil storage cylinder, and slow-closing small air cylinder, etc. The valve disc is opened by the medium's thrust, and during backflow, a two-step closure mechanism is employed (first quickly closing 80%, then slowly closing the remaining 20%), effectively balancing water hammer pressure.

Core Features

‌Compact Structure: Volume is just 1/4-1/20 of traditional swing check valves, lightweight.‌

Low fluid resistance: Only one-third of the fluid resistance of traditional check valves, with significant energy-saving effects.

Sealed Reliability: Equipped with rubber soft seals, wear-resistant, and boasts a long service life.

Wide Application Range: Pipe diameters from DN40 to DN1200, nominal pressure from 1.0 to 2.5 MPa, compatible with flange connections for various pipeline systems.

Application Scenario

Broadly applied in industrial water supply, municipal drainage, wastewater treatment plants, and chemical metallurgy fields, especially suitable for preventing water hammer damage at pump outlet.

Typical Model

Common models include HH46X, HDH48X, HH49X series, etc., for instance, HH48X covers pipe diameters from 200mm to 1200mm, with operating pressures ranging from 1.6MPa to 10MPa.