The stainless steel micro-resistance slow-closing check valve is an industrial valve used to prevent medium backflow and mitigate water hammer impact, primarily applied in drainage pipeline systems for clean water, wastewater, seawater, etc. Its core structure includes the valve body, semi-circular valve disc, return spring, oil reservoir, and slow-closing small air cylinder assembly. The valve disc is opened by the medium's thrust, and during backflow, a two-step closing mechanism is employed (first quickly closing 80%, then slowly closing the remaining part) to balance the water hammer pressure.

Core Features

Sealed Reliability: Utilizes stainless steel sealed face surfacing technology for stable sealing performance, wear resistance, and long service life.

Low fluid resistance: The valve body structure is compact, with fluid resistance only 1/4-1/20 of traditional valves, significantly improving energy-saving effects.

‌Soft-Close Function: Achieves valve disc soft-closing through hydraulic oil flow regulation, effectively eliminating water hammer impact and protecting pipelines and equipment.‌

Wide Application Range: Nominal Diameter (DN) 40-1400mm, nominal pressure 1.0-2.5MPa, supports horizontal or vertical installation.

Material and Standards

Valve Body Material: Gray cast iron, cast steel, or stainless steel (suitable for high-temperature environments).

Sealings: Nitrile rubber or chloroprene rubber.

Standard: Compliant with GB/T and API standards; some models support Ministry of Mechanical Industry standards or customized non-standard options.

Application Scenarios

Widely used in industrial water supply, municipal drainage, wastewater treatment plants, and pressure-assisted systems, such as preventing backflow and water hammer damage at pump outlets.