What is a check valve? How to choose one?

If you work with plumbing, HVAC, or industrial systems, you’ve likely heard of a check valve—but what exactly is it? A check valve (also called a non-return valve) is a mechanical component designed to let fluid (liquid, gas, or steam) flow in only one direction. It automatically shuts to block reverse flow, preventing damage to equipment or system failures.

Why Check Valves Matter: Core Functions

1. Prevent backflow: Without a check valve, fluid can reverse direction (e.g., water in a pipe flowing backward). This stops issues like contaminated water mixing with clean supplies or pump damage from reverse rotation.

2. Protect equipment: For pumps, compressors, or boilers, reverse flow can cause costly wear or breakdowns. Check valves act as a “safety gate” to avoid this.

3. Maintain system efficiency: By ensuring one-way flow, check valves keep pressure stable and prevent energy waste—critical for both residential plumbing and large industrial setups.

Common Uses You Might Encounter

Check valves aren’t just for factories. They’re everywhere:

• In home plumbing (under sinks, water heaters) to stop sewage backflow.

• In HVAC systems to keep refrigerant flowing correctly.

• In industrial pipelines (oil, gas, manufacturing) to protect sensitive machinery.

Choosing the Right Check Valve

Not all check valves work for every job. Key factors to consider:

• The type of fluid (liquid vs. gas, corrosive vs. non-corrosive).

• System pressure and temperature (high-pressure setups need durable materials like stainless steel).

• Size (must match your pipeline to avoid flow restrictions).

If you are upgrading your system or need to replace your check valves, partnering with a trusted supplier ensures you receive safe and durable components. For personalized advice, contact SGON Valve – the experts in fluid control solutions.