Check valve

Check valves — Selection and installation guide

Design and application checks

A check valve opens under forward flow and closes to limit reverse flow. Swing, lift and dual-plate designs respond differently to flow velocity, mounting orientation and transient conditions.

Select against the operating flow range, fluid condition, installation orientation and pump shutdown behaviour. A check valve is not a substitute for a positively operated isolation valve, and a generic “non-slam” claim does not replace a surge assessment.

What should I provide for a quotation?

Provide the fluid and composition, solids content, normal and design pressure and temperature, DN or NPS, connection standard, installation orientation, operating duty and required inspection documents. State any corrosion, vacuum, fire-safety or emissions requirements separately.

How do I confirm the pressure and temperature rating?

Use the approved data sheet, nameplate and pressure–temperature limits for the complete valve, including its seat, lining and seals. PN, ASME Class and JIS K are different designation systems, not a fixed numerical conversion. A shared nominal size does not establish flange interchangeability.

What must be checked before installation?

Compare the face-to-face dimension, flange drilling and facing, pipe bore, flow direction and maintenance clearance with the approved drawing. Clean and isolate the pipeline, release pressure and follow the product installation instructions. Do not use flange bolts to pull misaligned pipework into position.

Related product categories

• Swing check valves
• Gate valves
• Globe valves