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Pulsation Dampeners - Shock Alleviation / Multi-Head Interaction

Shock Alleviation - Multi Head Interaction

Pulsation-Dampeners.com
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Shock Alleviation - Lost Motion or Low Volumetric Efficiency – and the Velocity Jump or the Joukowski Shock FlexOrber CA (co-axial) interceptor Before – Shock Pulsation The shock is directed straight into the dampener. The dampener provides a decompression chamber plus a deadening volume and necessitates a direction from in to out. After - Shock Free Whether a cam hits a piston that has been stopped from fully returning or a solenoid fires the diaphragm the result is shock. When the beginning of the forward stroke does not displace any liquid, a pressure shock is emitted, instead of a flow surge. The shock is caused by the acceleration away from bottom dead center before it hits solid liquid. This acceleration without pumping liquid is caused in 3 ways: 1. Expansion of compressible liquid left from the last discharge stroke, stopping the pump filling properly on its suction stroke. 2. Volume control by limiting backstroke, as in some cam drives. 3. Instant action as from a solenoid drive. These shocks are bad for all forms of instrumentation, and usually cause pipe shake as well. An in line through flow dampener is needed to intercept the shocks. Multi-head Interaction Transients from one pump head, disturb the check valves of the next. Ref: “Shock” above, and “pressure pulsation” previously. When volumetric efficiency is less than 93%, the level of shock and pressure pulsation become greater can be tolerated by adjacent check valves. Beware of hot and compressible liquid piping systems. To prevent pressure transients in the suction line from breaking the liquid column into alternate slugs and voids, it is essential to intercept and remove the transients. This may be achieved by placing a flow-through pressure pulsation interceptor individually in the line to each check valve, or one central dampener, as shown here, with non interconnected pipes leading to a piping base block. This prevents the check valve from one cylinder talking to an adjacent cylinder, causing it open when should close, and creating even greater fall in efficiency. Similarly, in the discharge system, the extreme levels of discharge shock that comes from low efficiency, not only destabilizes valves that should be re-seating, but also makes control by feedback from instruments a near impossibility. The rule is never to use a normal manifold they create the maximum interaction. Prevent the suction system piping design or manifolds from wrecking your pump.