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A diving regulator or underwater diving regulator is a pressure regulator that controls the pressure of breathing gas for underwater diving.The most commonly recognised application is to reduce pressurized breathing gas to ambient pressure and deliver it to the diver, but there are also other types of gas pressure regulator used for diving applications.
Proof test - A manual test that allows the operator to determine whether the valve is in the "as good as new" condition by testing for all possible failure modes and requires a plant shutdown; Diagnostic Test - An automated on-line test that will detect a percentage of the possible failure modes of the shutdown valve.
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Globe control valve with the pneumatic actuator and smart positioner. The loop current and stem travel are displayed. Control valves are normally fitted with actuators and positioners.
Repair at backshops is known as field-level maintenance or intermediate-level (I-level) maintenance. SRUs are similar in nature to line-replaceable units (LRUs), but rather than being complete functional units, represent component functions, such as circuit card assemblies, of a larger LRU.
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A back-pressure regulator, back-pressure valve, pressure sustaining valve or pressure sustaining regulator is a control valve that maintains the set pressure at its inlet side by opening to allow flow when the inlet pressure exceeds the set value.
A shunt is a device that is designed to provide a low-resistance path for an electrical current in a circuit.It is typically used to divert current away from a system or component in order to prevent overcurrent.