Use this Check Valve CAD Blocks resource when preparing piping layouts that need clear, consistent non-return valve symbols. The downloadable DWG file supports drafting workflows for mechanical, plumbing, HVAC, and utility documentation.
Before placing a block, confirm the valve orientation, flow direction, connection arrangement, and project drafting conventions. A CAD symbol communicates the intended device location; it does not replace valve selection, sizing, pressure-class review, or coordination with the piping specification.
This Check Valve CAD Block library provides DWG-style symbols for non-return valves (NRV) in multiple sizes and configurations. The set includes typical valve representations used in mechanical and plumbing drawings, helping you draft faster and keep valve symbols consistent across plans, risers, and schematics.
Check valves are essential for preventing reverse flow in piping systems—commonly installed on pump discharge lines, equipment branches, and vertical risers to protect pumps, maintain system stability, and avoid backflow issues.
Use these CAD blocks for:
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Chilled water / hot water / condenser water hydronic systems
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Pump rooms and mechanical plant piping details
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Domestic water and utility piping schematics
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HVAC shop drawings and as-built documentation
Tip: Add tags like CV/NRV-01, pipe size, and service (CHW/HW/CW/DW) next to the block to support commissioning and maintenance teams.
Source : ari-armaturen.com
How to use the ARI non-return valve DWG symbols
Place the check valve symbol where reverse-flow protection is shown in the piping system, then align it with the pipe centerline and indicate the intended flow direction. Keep the symbol legible at the drawing scale and coordinate it with nearby pumps, equipment connections, isolation valves, strainers, reducers, and access requirements.
Drafting and coordination checklist
- Confirm that the symbol represents a check valve or non-return valve rather than an isolation valve or control valve.
- Orient the symbol consistently with the process or water-flow direction shown on the drawing.
- Match the block’s connection depiction to the project piping arrangement and applicable valve schedule.
- Add the project tag, pipe size, and service abbreviation when those identifiers are required by the drawing standard.
- Review the completed layout against pump-room clearances, maintenance access, supports, insulation, and adjacent fittings.
- Keep the DWG block as a drafting reference until the engineer or responsible designer confirms the actual valve type and installation requirements.
Where check valve symbols are commonly used
These blocks can support chilled-water, hot-water, condenser-water, domestic-water, and utility piping documentation. They are also useful in pump-room details, mechanical plant drawings, riser diagrams, HVAC shop drawings, and as-built updates.
Check valve terminology
Check valve and non-return valve (NRV) generally describe a valve intended to limit flow in the reverse direction. The symbol alone does not identify every operating characteristic. Final documentation should be coordinated with the equipment schedule, valve schedule, piping specification, and manufacturer information.
Frequently asked questions
What is included in this Check Valve CAD Blocks download?
The resource provides a DWG-style library of ARI check valve or non-return valve symbols in multiple sizes and configurations for piping and mechanical drafting.
Where are check valves typically shown?
They are commonly shown on pump discharge lines, equipment branches, vertical risers, hydronic piping, domestic-water diagrams, and utility schematics where reverse flow must be addressed.
Does the CAD block select the correct valve for a project?
No. The block is a drafting aid. Valve type, connection details, materials, pressure requirements, flow conditions, installation orientation, and maintenance needs must be verified from the project design and applicable manufacturer documentation.
What information should be placed next to the symbol?
Use the project valve tag, pipe size, and service identifier when required by the drawing standard. The supplied content gives CV/NRV-01 and service abbreviations as examples of useful drafting annotations.
Can the block be used in as-built drawings?
Yes, it can support as-built documentation when the installed valve location and configuration have been verified in the field and reconciled with the approved project records.