Home Valve ComparisonsSwing Check Valve vs Dual-Plate Check Valve - Which Non-Return Valve?

Valve Comparison Guide

Swing Check Valve vs Dual-Plate Check Valve - Which Non-Return Valve?

Swing check valve vs dual-plate (wafer) check valve: pressure drop, slam risk, installation and standards compared. Choose the right non-return valve for pipelines, pumps and compressors.

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Use a dual-plate check valve for oil & gas pipelines (API 6D), pump and compressor discharge where water hammer is a concern, offshore or weight-critical installations, and vertical pipeline configurations. Use a swing check valve for large bore (DN400+) gravity-flow or low-pulsation liquid systems where cost is the priority and water hammer is not a concern..

Overview

Swing Check Valve

A swing check valve uses a hinged disc that swings open with forward flow and closes by gravity and reverse flow pressure. It is the simplest and most economical check valve design, suitable for moderate flow velocities in liquid and gas service.

DN50–DN900, Class 150–600, A216 WCB / A351 CF8M, API 6D / ASME B16.34

Dual-Plate Check Valve

A dual-plate (or double-disc, wafer) check valve uses two spring-loaded half-discs that open in the centre. Spring assist ensures rapid, controlled closure before flow reversal, minimising slam and water hammer. Compact wafer design fits between flanges.

DN50–DN600, Class 150–1500, A216 WCB / A351 CF8M / A182 F51, API 6D

Swing Check Valve or Dual-Plate Check Valve?

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Pros & Cons

Swing Check Valve

Low forward pressure drop in fully open position

Simple, robust design - low maintenance

Full bore - disc swings fully out of flow path

Low cost for large bore applications

Suitable for both horizontal and vertical (up-flow) installation

Slam risk - disc can slam shut on flow reversal (water hammer)

Not suitable for pulsating or rapidly reversing flow

Large physical size - long face-to-face dimension

Slow closure - not ideal for pump discharge without surge dampening

Not suitable for vertical downward flow installation

Dual-Plate Check Valve

Very compact - wafer body, short face-to-face

Lightweight - 5–10× lighter than swing check at same bore

Spring-assisted closure - minimal slam and water hammer

Suitable for high-velocity, pulsating, and vertical service

API 6D certified for pipeline service

Works in any orientation - horizontal, vertical, or inclined

Higher pressure drop than swing check (discs and spring in flow path)

Not full bore - spring and hinge bar create turbulence

Slurries and viscous fluids can foul the spring mechanism

More complex - higher maintenance at very large bore

Swing Check Valve vs Dual-Plate Check Valve - Specification Comparison

Parameter	Swing Check Valve	Dual-Plate Check Valve
Design	Single hinged disc	Two spring-loaded half-discs
Bore	Full bore - disc clears flow path	Reduced bore - discs and spring in flow
Pressure Drop	Lower (full bore, fully open)	Slightly higher (spring and hinge bar)
Slam / Water Hammer	High risk - disc free to slam	Minimal - spring ensures gentle controlled closure
Weight	Heavy - long body, swing mechanism	Very light - wafer body, no extended swing arm
Face-to-Face	Long (ASME B16.10)	Very short (wafer - between flanges)
Installation	Horizontal or vertical (up-flow only)	Any orientation
Slurry / Dirty Fluids	Better - simple hinge, no spring to foul	Spring may foul with slurries
Cost	Lower at large bore (DN300+)	Lower at small-medium bore (DN50–DN200)
Standards	API 6D, BS 1868, ASME B16.34	API 6D, API 594, ASME B16.34

When to Use Each

Use Swing Check Valve when:

Gravity-flow or low-pulsation liquid systems

Water distribution and irrigation mains

General purpose pump discharge (low water hammer risk)

Large bore applications where cost is critical

Horizontal pipelines with low flow reversal velocity

Use Dual-Plate Check Valve when:

Oil & gas pipeline service (API 6D) - compact and lightweight

Pump and compressor discharge - spring prevents slam

Vertical upward or downward pipeline installation

High-velocity service where water hammer is a concern

Offshore platforms - weight and space are premium

Decision Guide

Frequently Asked Questions

Which check valve is better for pump discharge?

Dual-plate check valves are preferred for pump discharge because spring-assisted closure prevents the sudden flow reversal that causes slam (water hammer) when a pump trips. This is especially critical for high-head pumps and multiple pump installations. Swing check valves on pump discharge can cause significant pressure surge unless a slow-closing (weighted disc or dashpot-assisted) design is used.

Can a dual-plate check valve be installed vertically?

Yes - dual-plate check valves with springs can be installed in any orientation: horizontal, vertical upward, or vertical downward flow. Swing check valves can only be installed in horizontal or vertical upward flow configurations. Vertical downward installation of a swing check valve prevents gravity-assisted closing and will not work.

What does API 6D mean for check valves?

API 6D is the American Petroleum Institute standard for pipeline valves including check valves. API 6D check valves must comply with specific pressure-temperature ratings, leakage testing (API 598), materials, and dimensions. For mainline oil & gas pipeline service, API 6D certification is typically required. Both swing and dual-plate designs are available in API 6D versions.

Reviewed by Application Engineering, Vajra Industrial SolutionsDiscipline: Valve Application EngineeringLast reviewed: 20 June 2026