MULTIHEAD INTERACTION
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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 liquids. 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 damper, 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 to open when it should be close, and creating an 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. |
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