In industrial pipeline systems, check valves are essential components used to prevent backflow of media. Among them, the lug type check valve is favored in many applications due to its unique structure and installation method.

Structural Features

The lug type check valve is a one-way valve with threaded lug connections. It typically consists of a valve body, valve disc, valve seat, and a spring (in some models). The most notable feature of this valve is the presence of multiple threaded lug holes on both sides of the valve body, allowing it to be directly bolted to the pipeline flanges without the need for additional nuts. Common materials used include carbon steel, stainless steel, and ductile iron, which are selected based on the specific operational requirements. Compared to the wafer check valve, the lug type check valve offers a more secure installation, capable of withstanding higher pipeline loads. It also supports single-end maintenance, making it suitable for applications that require frequent disassembly and maintenance.

Working Principle: Unidirectional Flow, Preventing Backflow

The core function of the lug type check valve is to ensure that the fluid flows in only one direction. In the event of backflow, the valve disc quickly closes to prevent damage to equipment caused by the reverse flow of the medium.

(1) During normal flow:

The fluid pressure pushes the valve disc open, allowing the medium to flow smoothly through the pipeline.

(2) When the flow decreases or backflow occurs:

The valve disc automatically closes under the action of the spring or gravity, preventing the backflow of the medium and protecting the pipeline and equipment from damage. Some lug type check valves are equipped with a spring-assisted closing mechanism, which responds more quickly to fluid changes, reduces water hammer effects, and enhances system safety.

Main Application Scenarios

Due to its unique structure and stable performance, the lug type check valve is widely used across various industries:

(1) Water Treatment and Supply Systems

It ensures one-way water flow, preventing backflow when pumps stop, and protects the system from damage.

(2) Oil and Gas Pipelines

Suitable for high-pressure and high-temperature conditions, it prevents backflow of fluids from impacting equipment.

(3) Chemical Industry

In pipelines conveying corrosive media, lug type check valves made from corrosion-resistant materials ensure production safety.

(4) Power Plants and Boiler Systems

Used in steam delivery pipelines to prevent pressure fluctuations from affecting equipment.

(5) Industrial Fluid Control

Ideal for systems transporting various liquids, gases, or low-viscosity fluids, improving system stability.

Advantage

(1) Stable Installation

The threaded lug design allows the valve to be installed or removed independently without affecting the entire pipeline system, making maintenance easier.

(2) Single-End Removal and Maintenance

The valve can be replaced or serviced without removing the entire pipeline, reducing maintenance costs.

(3) Suitable for High-Pressure Environments

Compared to wafer check valves, the lug type check valve offers a more secure installation and can withstand higher operating pressures.

(4) Reduces Water Hammer Effect

Some models are equipped with a spring mechanism, enabling quicker closure to reduce backflow impact and extend the lifespan of the pipeline.

Maintenance Management and Economic Benefits

In long-term operation, the lug type check valve, with its structural advantages and design optimization, effectively reduces maintenance frequency and operational costs. Regular inspection of the lug connections and valve disc sealing can prevent potential failures, ensuring continuous and safe system operation. Meanwhile, the convenient single-end removal and quick replacement design bring higher economic benefits and operational efficiency to the plant.