NSV Counter weight Check valve with strainer

This swing-type check valve features a lever-and-weight external actuation system combined with an integral strainer screen. The valve is designed to remain fully open under normal forward flow conditions, with the counterweight providing a stable, low-maintenance closing force that reacts to flow deceleration or reverse flow. The built-in strainer protects downstream equipment by continuously filtering debris while the valve is in operation. When reverse flow occurs, the weighted lever ensures rapid and positive closure, effectively preventing backflow and safeguarding pumps and compressors from destructive reverse rotation.

Key Features

Counterweight Actuation: The external lever and weight system provides consistent closing torque without relying on springs, making it ideal for high-temperature or corrosive services where spring fatigue may be a concern.

Integral Strainer: The valve body incorporates a strainer screen upstream of the disc, allowing continuous debris removal during normal flow and reducing the need for separate inline strainers.

Swing-Disc Design: Low pressure drop during full opening; the disc pivots smoothly on a hinge pin, ensuring long service life with minimal wear.

Wafer or Lug Connection: Compact body design enables installation between standard flanges, saving space and simplifying piping layout.

Manual Override Option: Some models include a locking device on the weight lever for temporary manual locking during maintenance or system startup.

Durable Construction: Available in carbon steel, stainless steel, or ductile iron to suit a wide range of media, including water, oil, steam, and corrosive fluids.

Typical Applications

Commonly used in pumping station discharge lines, cooling water systems, wastewater treatment plants, and industrial process pipelines where backflow prevention and debris filtration are both required. The counterweight design is particularly favored in large-diameter piping systems where spring-loaded check valves may not provide sufficient closing force, and the strainer function helps extend the service life of downstream pumps, heat exchangers, and control valves.

FAQ

1.Q: What’s the brand of your company can supply ?

A:NSV or OEM service.

2.Q:Is there have MOQ?

A：No.we can accept 1set,but there have additional cost $150.00(process of export) if the order value within $2000.00.

3. Q:How can I get a quote?

A: If you request quote by preparing the product spec you want to request specifically through “Contact us or Feedback” of homepage, we will send reply to you ASAP. If the contents of homepage are not available, you can inquire to us via phone(86-577-67378616) or fax(86-577-67372367).