HomeValve ComparisonsTilting Disc Check Valve vs Swing Check Valve

Valve Comparison Guide

Tilting Disc Check Valve vs Swing Check Valve — Closing Speed and Water Hammer

Tilting disc (dual plate) check valves close faster than swing check valves — reducing water hammer. Compare closing time, pressure drop, size, installation orientation, and application suitability.

Overview

Tilting Disc Check Valve (Dual Plate)

Dual-plate tilting disc check valves use two spring-loaded half-discs (plates) hinged on a central shaft. The spring tension closes the plates before flow reversal begins — eliminating the reverse flow that causes water hammer in swing checks.

DN25–DN1200, Class 150–600, A216 WCB / A351 CF8M, API 594, dual-plate spring-loaded

Swing Check Valve

Swing check valves use a single disc hinged at the top of the body that swings open with forward flow and closes under gravity/reverse pressure. Simple, inexpensive, and suitable for large-bore applications with moderate flow velocities.

DN25–DN2400, Class 150–2500, A216 WCB / A351 CF8M / Ductile Iron, bolted bonnet, API 6D for pipeline

Pros & Cons

Tilting Disc Check Valve (Dual Plate)

Fast closing — spring closes plates before reverse flow; minimal water hammer
Low pressure drop — plates are thin and offer less flow obstruction than swing disc
Compact and lightweight — wafer design between flanges; no external hinge
Suitable for vertical upward and horizontal flow — spring provides positive closure in any orientation
Not suitable for viscous or dirty service — spring fatigue and plate sticking
Disc is not replaceable in wafer design — full valve replacement when disc wears
Higher cost than swing check in same size

Swing Check Valve

Very low pressure drop — disc swings fully open parallel to flow in high-velocity service
Simple design — minimal moving parts; very reliable in clean service
Lower cost than dual-plate in large bore
Full-bore design options available for pig-passing service
Slow closing — disc swings by gravity; significant reverse flow before closure causes water hammer
Not suitable for vertical downward flow — gravity closes disc prematurely in downward flow
Heavy disc can create noise and vibration (disc flutter) at partial flow

Tilting Disc Check Valve (Dual Plate) vs Swing Check Valve — Specification Comparison

ParameterTilting Disc Check Valve (Dual Plate)Swing Check Valve
Closing SpeedFast — spring closes before full reverse flowSlow — gravity closes after reverse flow begins
Water Hammer RiskLow — spring minimises reverse velocityHigh — disc slap from reverse flow creates pressure surge
Vertical Upward FlowYes — spring ensures closureLimited — gravity aids closure but flow must be high
Vertical Downward FlowYes — spring closes against gravityNo — disc stays closed in downward flow by gravity
Pressure DropLow — two thin plates; small obstruction areaVery low (large bore) — disc swings fully open
Body DesignWafer or flanged; compactBolted bonnet, full-body casting; larger and heavier
Size RangeDN25–DN1200 (practical limit)DN50–DN2400 (economical in large sizes)

When to Use Each

Use Tilting Disc Check Valve (Dual Plate) when:

High-speed pump discharge — large centrifugal pumps where fast closure prevents reverse rotation
Vertical upward flow — spring holds plates closed until forward flow
Long pipelines where water hammer from swing check slap would damage equipment

Use Swing Check Valve when:

Low-velocity, clean water and liquid service where water hammer is not a concern
Gravity drain lines and low-pressure service where fast closing is not required
Very large bore DN600+ where tilting disc cost is high and flow velocity is moderate

Decision Guide

Choose tilting disc (dual plate) check valves for centrifugal pump discharge lines, high-velocity service, any vertical flow application, and wherever water hammer is a design concern. Choose swing check valves for low-velocity service, large bore (DN800+) gravity drain and cooling water systems where water hammer is not a concern, and when economy is the primary driver.

Frequently Asked Questions

What causes water hammer from check valve closure?
Water hammer occurs when a check valve closes after significant reverse flow has already begun. In a swing check valve, the disc closes slowly by gravity — by the time the disc seats, the fluid has already reversed at some velocity (typically 0.3–1.5 m/s). When the disc seats and stops this reverse flow instantaneously, the momentum change creates a pressure pulse (Joukowski pressure surge) that travels up the pipeline as a pressure wave. A dual-plate spring-loaded check valve closes before reverse flow velocity builds — eliminating the momentum change and the resulting water hammer.

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