Excess pressure is relieved by allowing the pressurized fluid to flow from an auxiliary passage out of the system. The relief valve is designed or set to open at a predetermined set pressure to protect and other equipment from being subjected to pressures that exceed their design limits. When the set pressure is exceeded, the relief valve becomes the "" as the valve is forced open and a portion of the fluid is diverted through the auxiliar. [pdf]
ASME has developed a set of standards for drill bushings to ensure quality and interoperability in their design and use. These standards provide guidelines and specifications for various aspects of drill bushing. [pdf]
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