Check Valves

Check valves are one-way plumbing devices that stop reverse flow, protect pumps and fixtures, and keep lines primed. Used across residential, commercial, and industrial systems, they prevent backflow, curb water hammer, and maintain pressure in sump pumps, well systems, irrigation zones, boilers, and HVAC loops. Also called non‑return or one‑way valves, they provide a simple path to reliability and compliance with local plumbing codes.

Choose from common types to match your application. Swing check valves offer low restriction for clean water lines. Spring or “silent” check valves close quickly to reduce hammer in vertical runs. Ball and lift checks handle higher solids or pulsating service. Wafer and dual‑plate designs save space in flanged assemblies. Materials include lead‑free brass or bronze for potable water, stainless steel for strength and temperature resilience, and PVC or CPVC for corrosion resistance and easy solvent welding. Connection options cover NPT thread, sweat/solder, press, solvent‑weld, union, and flanged ends to suit new installs and repairs.

Key selection factors include line size, pressure rating, temperature range, media compatibility, and cracking pressure—the minimum pressure needed to open the valve. Look for full‑port geometry to minimize pressure drop, soft‑seat seals (EPDM, FKM, PTFE) for tight shutoff, and clear‑body models for quick visual checks. Verify certifications such as NSF/ANSI 61/372 for potable water.

Installation is straightforward: orient with the flow arrow, confirm vertical or horizontal suitability, and place the valve close to the pump discharge or zone branch. Add isolation valves for service, and a strainer upstream to keep debris off the seat. If you hear chatter or experience nuisance hammer, consider a spring‑loaded or silent pattern, relocate the valve, or add an arrestor. Routine inspection and readily available repair kits keep check valves performing for years. For wastewater, choose swing checks with flappers and corrosion‑proof fasteners for long‑term durability.