Transcription of To: MASTER CATALOG HOLDERS SUBJECT: VIKING …
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To: MASTER CATALOG HOLDERS SUBJECT: VIKING …
ENGINEERING SERVICE BULLETIN ESB-31 Page 1 of 6 Effective: 12-16-10 Supersedes: 5-27-85 To: MASTER CATALOG HOLDERS subject : VIKING pressure RELIEF VALVES This Engineering Service Bulletin deals with the terminology and some typical questions asked with regards to the performance of VIKING pressure relief valves. In general, the terminology and answers given apply to the following types of valves shown below: TERMINOLOGY OF VIKING pressure RELIEF VALVES 1. Cracking pressure : The cracking pressure (refer to Figure 4) is the pressure at which the valve begins to open and bypass liquid. The cracking pressure is not affected by pump size, pump capacity, or liquid viscosity. The pump will deliver full capacity (except for slippage loss) at the cracking pressure . Most commercial relief valves use the cracking pressure as their valve setting. The relief valve size is selected by the amount of over pressure desired ( pressure between cracking and complete bypass).
ENGINEERING SERVICE BULLETIN ESB-31 Page 1 of 6 Effective: 12 -16 10 Supersedes: 5-27-85 To: MASTER CATALOG HOLDERS SUBJECT: VIKING PRESSURE RELIEF VALVES
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