Basic Information

• Model: DCHL (General Type) / KDCHL (Sulfur-Resistant Type)

• Pressure Rating: PN1.6–10.0 MPa (Class 150–600)

• Size Range: DN25–600 mm (NPS 1–24)

• End Connection: Flanged

• Actuation: Automatic

• Materials: Carbon Steel, Austenitic Stainless Steel, Duplex Stainless Steel

Features and Advantages

• No external power supply or instrument signals required

• Only three pipeline connections needed, ensuring easy installation

• Metal-to-metal sealing structure ensures zero leakage under sealing performance tests, providing enhanced protection for pumps and systems

• Can be installed either horizontally or vertically

• No dynamic sealing components such as packing—long service life and maintenance-free

• Integrates multiple functions: main line check valve, bypass check valve, automatic flow detection, automatic recirculation flow control, and pressure reduction

• Protected by patented technology

• Custom design and manufacturing available based on user requirements

• Proven performance in various key domestic and international projects

Product Description

When the flow of a centrifugal pump drops below its required minimum, issues such as reduced efficiency, increased vibration and noise, and overheating may occur. Installing the DCHL Multi-functional Automatic Recirculation Valve prevents these problems by automatically directing a portion of the fluid back to the pump’s inlet-side container for recirculation, ensuring the pump’s minimum flow is maintained. When the pump shuts down, the main valve disc closes quickly to prevent backflow and reverse rotation of the rotor, thereby protecting the safety of the pump system.

Natural gas treatment plant                        Natural gas treatment plant

PN10.0MPa DN200 DCHL type                  PN2.5MPa DN200 KDCHL type