Home Valve ComparisonsTilting Disc Check Valve vs Swing Check Valve - Closing Speed and Water Hammer

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.

[object Object] vs [object Object]: which should you choose?

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..

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

Tilting Disc Check Valve (Dual Plate) or Swing Check Valve?

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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

Parameter	Tilting Disc Check Valve (Dual Plate)	Swing Check Valve
Closing Speed	Fast - spring closes before full reverse flow	Slow - gravity closes after reverse flow begins
Water Hammer Risk	Low - spring minimises reverse velocity	High - disc slap from reverse flow creates pressure surge
Vertical Upward Flow	Yes - spring ensures closure	Limited - gravity aids closure but flow must be high
Vertical Downward Flow	Yes - spring closes against gravity	No - disc stays closed in downward flow by gravity
Pressure Drop	Low - two thin plates; small obstruction area	Very low (large bore) - disc swings fully open
Body Design	Wafer or flanged; compact	Bolted bonnet, full-body casting; larger and heavier
Size Range	DN25–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

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.

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

[object Object] vs [object Object] — Procurement & Documentation

Documentation Available

-EN 10204 3.1 Material Test Certificates (heat traceable)
-API 598 hydrostatic shell & seat test reports
-Dimensional inspection reports
-Full Manufacturing Data Record (MDR) / data book on request

View documentation package

Inspection Options

-In-house QC inspection on every order
-Third-party inspection (SGS / Bureau Veritas / TÜV / DNV) coordination
-Witness and hold points accommodated on request

View inspection & testing

Order Quantities

Flexible — from single critical-spare valves to full project lots.

Export

Worldwide export with complete documentation (COO, EUR.1, packing lists) to 20+ countries.

Custom Engineering

Built to your specification — materials, trim, pressure class and special service (NACE, fire-safe, IBR, cryogenic).

Delivery Support

Dispatch from Vadodara, Gujarat with documented lead times and priority handling for urgent requirements.

Connected Engineering

Failure Modes

Water Hammer

Products

Check Valves

Tools

Water Hammer Estimator

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