Project Background

This is a large‑scale mining water supply project in South Africa, committed to building safe, stable and long‑distance water transmission pipelines to reliably satisfy the water demand for mining production and daily operation. The project operates under harsh mine working conditions, requiring high‑performance valve solutions to ensure system safety and continuity.

Project Challenges

Long‑distance water pipelines face serious risks such as medium backflow, severe water hammer, pump damage and pipeline failure, which threaten the stable operation of the entire water supply system.

Solution

WEIZIDOM DN800 heavy hammer check valve is installed at key nodes of the water pipeline. It adopts heavy hammer buffering and two‑stage closing design to deliver stable and reliable performance.

Key Advantages

Effectively prevents medium backflow and ensures one‑way flow stability

Eliminates destructive water hammer during pump start‑stop and emergency shutdown

Provides reliable sealing and strong corrosion resistance

Adapts perfectly to harsh mine working environments

Protects water pumps and pipelines from impact and damage

Project Outcome

Since commissioning, WEIZIDOM DN800 heavy hammer check valve has maintained stable, safe and continuous operation for the water supply system. It has successfully solved water hammer and backflow risks, reduced maintenance costs, and provided solid protection for the mine’s long‑term production and operation.

This project has become a benchmark application of large‑diameter check valves in the mining water supply industry in South Africa.

Main Product: DN800 Heavy Hammer Check Valve

What is a Heavy Hammer Check Valve & Its Working Principle and Application Scenarios

A heavy hammer check valve is a specialized type of automatic check valve engineered to prevent the reverse flow of media in pipelines, and it is widely recognized for its high reliability, stable performance and strong adaptability to harsh working conditions.

Different from ordinary check valves, it is equipped with a heavy hammer counterweight mechanism on the valve disc, which cooperates with the mechanical structure of the valve body to realize the automatic opening and closing of the valve. This structural design makes it have excellent anti-backflow and water hammer elimination capabilities, and it has become an indispensable key fluid control component in various industrial pipeline systems, especially in large-diameter and high-pressure pipeline projects.

The working principle of the heavy hammer check valve is based on the balance between the fluid dynamic force of the medium in the pipeline and the gravity of the heavy hammer, combined with the lever mechanical principle to complete the automatic on-off operation. When the medium in the pipeline flows in the positive direction, the impact force and pressure of the fluid push the valve disc open against the gravity of the heavy hammer and the friction of the mechanical structure. The opening degree of the valve disc is automatically adjusted according to the flow rate and pressure of the medium: the larger the positive flow rate and pressure, the larger the opening degree, ensuring the unimpeded positive flow of the medium. When the positive flow of the medium decreases, the fluid dynamic force weakens, and the heavy hammer drives the valve disc to gradually close under the action of gravity; when the medium has a reverse flow tendency or the pipeline pressure drops suddenly, the heavy hammer will quickly drive the valve disc to close tightly, and most heavy hammer check valves are designed with a two-stage closing structure. The first stage is slow closing to reduce the impact of the medium, and the second stage is fast sealing to ensure zero reverse flow of the medium. This unique closing mode can effectively eliminate the destructive water hammer phenomenon caused by the sudden closing of the valve in the pipeline, and avoid the impact damage to pumps, pipelines and other equipment.

Thanks to its outstanding performance advantages such as reliable anti-backflow, effective water hammer elimination, stable operation and strong corrosion resistance, the heavy hammer check valve is widely used in a variety of industrial and civil pipeline systems, especially in projects with high requirements for pipeline safety and continuous operation. Its main application scenarios are as follows:

First, the mining water supply and drainage system. As reflected in large-scale mining water supply projects, mining working conditions are harsh, and long-distance water transmission pipelines are prone to medium backflow and water hammer risks. The heavy hammer check valve can adapt to the harsh environment of the mine, protect the water pump and pipeline from impact, and ensure the stable water supply for mining production and operation.

Second, the municipal water supply and drainage and sewage treatment industry. In large-diameter municipal water transmission pipelines, sewage lifting pump stations and rainwater drainage systems, it can prevent the reverse flow of tap water or sewage, avoid the backflow of sewage into the pump station and cause equipment failure, and ensure the normal operation of the municipal water supply and drainage system.

Third, the petrochemical and chemical industry. In the pipelines for conveying oil, natural gas, chemical raw materials and other media, it can prevent the reverse flow of flammable, explosive and corrosive media, avoid medium mixing and safety accidents, and its good sealing and corrosion resistance can adapt to the characteristics of various chemical media.

Fourth, the power plant water supply and circulating water system. In thermal power plants, hydropower stations and other power engineering pipelines, especially in the circulating water and cooling water supply systems of large units, it can eliminate the water hammer generated during the start and stop of water pumps, protect the large-scale water pump units and pipeline networks, and ensure the continuous and stable operation of the power plant's production system.

Fifth, the water conservancy and hydropower engineering field. In long-distance water diversion projects, reservoir water delivery pipelines and hydropower station water intake and discharge systems, it can adapt to the large flow and high-pressure characteristics of water conservancy pipelines, prevent the reverse flow of water flow and the impact of water hammer on hydraulic structures, and guarantee the safety and efficiency of water conservancy projects.

In addition, it is also widely used in industrial fields such as metallurgy, papermaking and food processing, which need to transport liquid media and have strict requirements for anti-backflow and pipeline protection.

In summary, the heavy hammer check valve, with its unique structural design and excellent performance, has become a key component to ensure the safe and stable operation of various pipeline systems. With the continuous development of industrial engineering toward large-scale and high-efficiency, its application range will be further expanded, and it will play a more important role in fluid control and pipeline safety protection.

Tags: Check Valve Heavy hammer check valve