Why are check valves usually installed at the pump outlet?

The installation of check valves at the pump outlet is mainly to prevent reverse flow after the pump stops and to reduce the impact of reverse flow and pressure fluctuations on the pump and the system. The specific installation position and valve type should be determined through system hydraulic calculations, pump type, flow rate, water hammer risk, installation direction, and maintenance conditions; whether to install a bottom valve or other check devices at the pump inlet is another issue related to the system design.

Swing check valve

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Home > Valve Types > Check valve > Swing check valve

A swing check valve uses a hinged disc that moves with forward flow and returns toward its seat as the flow reduces or reverses. It is a different arrangement from a lift or dual-plate check valve.

Swing check valves: compare construction, connections and application requirements. Confirm materials, operating conditions and complete-valve ratings for your project.

Swing check valves — Selection and installation guide

Design and application checks

A swing check valve uses a hinged disc that moves with forward flow and returns toward its seat as the flow reduces or reverses. It is a different arrangement from a lift or dual-plate check valve.

Confirm permitted mounting orientation, hinge clearance, minimum stable flow and closure behaviour. Pump stopping time, pipeline length and system inertia affect water hammer; choose closure characteristics for the actual system.

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.

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