The Pipeline Shock Prevention People
Pump Start-up surge, Valve closure shock, Pump shutdown back flow bang.
Large vessels for high pressures with matching bladders, diaphragms, gas bags, and bellows, for over a third of a century.

ShockGuard Ltd. offer shock alleviators. | Please phone USA 910-270-2737
We have people not voicemail. | Call toll free 1-888-DAMPERS

Fluid Flow Control Animations
Fluid Flow Control Animations


Pressure over Time problems that we solve:

Surge Alleviators Informative Graph surge alleviators shock alleviators resonance thermal compensation

Surge Alleviators Installation and Maintenance Installation, Operation & Maintenance Click Here

Looking at a simple schematic with a centrifugal pump, several alleviators can be used to guard you against startup surge, resonant pump shaft deflection and valve closure shock.

general schematic with shock alleviators and their  specialty
1. Reservoir
2. Centrifugal Pump
3. Motorized progressive Valve - Open when pump starts, then close as pressure begins to fall. Avoids acceleration head surge. Open when pump is stopped to prevent vacuum into which liquid rushes back and causes shock
4. Vacuum Breaker - valve used where pump may be stopped suddenly and there is no power for an item 4. to be opened
5. Pressure Instrument taping - Pressure over time traces taken at this point
6. Startup Surge Alleviator - JUMBOFLEX by SHOCKGUARD Ltd. for surge free "soft start"
7. Resonance Decoupler - WAVEGUARD by PULSEGUARD Ltd. stop system response damaging the pump, decouples pump from system
8. Block valves - Liquid over pressure, from expansion
9. High Temp Expansion compensator - Volume compensators by SHOCKGUARD Ltd. LIQUIBELLO all metal, or FLEXORBER with EI DuPont TEFLON
10. SURGEGUARD by SHOCKGUARD Ltd. low pre-fill, high compression ratio units for valve slam water hammer prevention
11. Emergency fast shut down valve

Understanding the fundamentals of Shockguard Explanations - Understanding Frequencies / How shock and surge prevention works

LDi - analytical and modeling services and software
Visit LIQUID DYNAMICS Intl. Ltd. LDi offers analytical and modeling services. They predict these and similar problems, before pipe systems are built. ShockGuard is a licensed run time user of the LDi Ltd. software, ShockView. ShockView enables us to quickly and accurately run your proposed piping system, in our computers and you what the maximum level of pump start up surge, or shutdown shock will be.
Centrifugal pump, start-up surge, shut-down shock


ShockGuard Shock / Surge Alleviators and Accumulators
Water Hammer and Pipeline Shock / Surge Prevention Equipment
STOP Pump start up surge, Valve closure shock, and Shut down back flow water hammer.
Call Toll Free 1-888-326-7377, UK Europe -- 44(0)161-480-9625, or Contact Us Online.

Understanding How it Works
Shock alleviators and shock accumulators do not alleviate shock, nor do surge alleviators and surge accumulators alleviate surge. SurgeGuard, JumboFlex, and Floatolator all work in the same way. They provide a soft place, so that the pump does not have to instantly accelerate all the liquid in the pipe system when it starts. Similarly, they provide a place into which flow can continue, for a time, against increasing resistance, when a a valve has been slammed. In both cases, because time has been increased, peak pressure generation is decreased. In short, they all prevent the peak pressure from being generated. /

Other Important Sites to Help You

Fluid Flow Control The Fluid Flow Control Source Pumps Accumulators Filters Dampers Heat Exchangers Valves Mixers P.I. / Pressure Indicators Controls Meters Vessels