Ding Liang Grooved Fittings and Installation Accessories

Ding Liang offers a comprehensive range of grooved pipe fittings, couplings and installation accessories for fire-protection, automatic-sprinkler, water and mechanical piping systems.

This page combines the products supplied in the Ding Liang catalogue into one complete product-range page. The manufacturer issued one catalogue covering multiple grooved fittings and connection components rather than a separate document for every individual model.

The range includes rigid and flexible couplings, elbows, tees, crosses, reducers, flange adapters, mechanical tees, caps and grooved or threaded branch connections used to install, modify and extend piping systems.

Company and Quality Control:

The catalogue presents Shandong Ding Liang as a manufacturer of cast and grooved piping products with multiple production and quality-control facilities.

The quality-control equipment and processes shown include:

• Chemical composition inspection.
• Leakage testing.
• Metallurgical microscopy.
• Carbon and sulfur analysis.
• Salt-spray testing.
• Gasket testing.
• Foundry-sand testing.
• Tensile-strength testing.
• Dimensional inspection.
• Final visual inspection.

Main Product Families:

Couplings:

• Rigid Couplings.
• Flexible Couplings.
• Standard Rigid Couplings.
• Standard Flexible Couplings.
• Reducing Couplings.
• Heavy-duty configurations according to the available range.

Rigid Coupling:

Provides a rigid grooved joint intended to limit relative movement between connected pipe ends.

Flexible Coupling:

Allows controlled angular deflection and movement resulting from expansion, contraction or pipe alignment, within the limits of the selected model.

Catalogue tables show that multiple rigid and flexible coupling sizes are rated at:

• 300 PSI.
• Approximately 2.07 MPa.
• Approximately 20.7 bar.

The shown table configurations carry FM and UL references.

Elbows:

The range includes elbows for changing piping direction, including:

• 90° Elbows.
• 45° Elbows.
• Additional angle configurations according to the catalogue.

Tees and Crosses:

The range includes:

• Equal Tees.
• Reducing Tees.
• Grooved Tees.
• Threaded Outlet Tees.
• Crosses.
• Reducing Crosses.

These fittings are used to create additional branches from the main pipe, with equal, reducing, grooved or threaded outlet options.

Mechanical Tees:

Mechanical tees allow a branch connection to be added through a prepared hole in the main pipe.

Available configurations may include:

• Grooved Outlet Mechanical Tee.
• Threaded Outlet Mechanical Tee.
• U-Bolt Mechanical Tee.

Reducers:

The range includes fittings for transitioning between pipe sizes, including:

• Concentric Reducers.
• Eccentric Reducers.
• Grooved Reducers.
• Threaded Outlet Reducers.

Flange Adapters:

Flange adapters allow grooved piping to connect to flanged valves, pumps and equipment.

Models appearing in the certification documentation include:

• XGQT10 Flange Adapter.
• XGQT10A Class 150 Flange Adapter.

Pipe Caps:

Caps are used to close pipe ends temporarily or permanently. Selected models may include additional outlet-hole configurations.

Materials and Components:

The products use cast metallic housings suitable for grooved piping connections, together with gaskets, bolts and nuts selected according to the fitting type and working pressure.

Typical components include:

• Cast fitting or coupling housing.
• Elastomeric gasket.
• Bolts and nuts.
• Protective surface finish.
• Grooved or threaded outlet according to model.

Gaskets:

FM approval documentation inside the file refers to selected couplings supplied with:

• Grade E EPDM gasket.
• Suitable standard gasket lubricant.

The gasket must be selected according to the system fluid and operating temperature.

Available Finishes:

FM documentation shows finish options including:

• Painted finish in red, grey or orange.
• Galvanized surface finish.
• Epoxy powder-coated finish in red, grey or orange.

The final finish must be selected according to corrosion exposure, installation environment and project requirements.

Approvals and Certifications Shown:

The catalogue cover and certification pages show:

• FM Approved.
• UL Listed.
• cULus Listed.
• ISO 9001.

The file includes UL and FM documentation for multiple grooved fittings and couplings intended for aboveground fire-protection systems.

Approval status must be verified for the exact:

• Model.
• Size.
• Pipe type.
• Groove type.
• Working pressure.
• Gasket.
• Finish.
• Product marking.

Compatible Pipe Types:

Certification tables refer to applications involving:

• Schedule 40 cut-groove pipe.
• Schedule 10 rolled-groove pipe.
• Thin-wall rolled-groove pipe.
• Light-wall pipe.
• Selected Chinese and Japanese standard pipes.
• Rolled and cut grooves according to the listed wall thickness and pipe size.

Applications:

• Firefighting piping systems.
• Automatic sprinkler systems.
• Fire-hose and hydrant piping.
• Fire-pump rooms.
• Valve and equipment connections.
• Water piping.
• Commercial buildings.
• Industrial facilities.
• Warehouses and distribution centers.
• Residential and office projects.
• Piping modification and maintenance.

Benefits of Grooved Connections:

• Fast installation.
• Reduced field welding.
• Easier removal during maintenance.
• Rigid and flexible joint options.
• Mechanical-tee branch connections.
• Convenient connection to valves and pumps.
• Corrosion-resistant finish options.
• Wide range of sizes and fitting types.
• Suitable for piping extensions and modifications.

Required Information Before Quotation:

• Product type.
• Model number where available.
• Nominal pipe size.
• Actual pipe outside diameter.
• Cut or rolled groove.
• Pipe schedule and wall thickness.
• Working pressure.
• Gasket type.
• System fluid and temperature.
• Required finish.
• Required approval.
• Quantity.
• Consultant and project requirements.

Installation Notes:

• Inspect pipe grooves before installation.
• Clean the pipe ends and remove dirt and metal particles.
• Inspect the gasket for damage.
• Use compatible gasket lubricant.
• Position coupling housings evenly.
• Tighten bolts gradually and alternately.
• Follow model-specific torque requirements.
• Do not install damaged fittings or gaskets.
• Pressure-test the completed system.
• Confirm the required UL or FM mark on the supplied product.

Important Note:

All Ding Liang products in the supplied file are combined under one product page because the manufacturer issued them in one complete grooved fittings catalogue.

Refer to the attached catalogue for full model lists, sizes, dimensions, weights, working pressures, pipe compatibility and detailed approval information.