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EZH and EZHSO Series

PILOT BLEED RESTRICTION

REG ULATO R ACTUATO R DIAPHRAGM

TYPE PRX/120 FILTER V

PILOT DISK

TYPE SA/2 S B R L M

A PILOT LOW ER DIAPHRAG M

M1011

TYPE EZHSO

MAIN VALVE DISK (PLUG)

INLET PRESSURE LO ADING PRESSURE PILOT SUPPLY PRESSURE OUTLET PRESSURE ATMOSPHERIC PRESSURE

TYPE PRX: S - BLEED PO RT B - SUPPLY PORT L - LOADING PORT A - SENSING PORT

TYPE SA/2: V - SENSING PORT R - PILOT SUPPLY PORT M - INLET PORT

Figure 4. Type EZHSO (Spring-to-Open Version) Operational Schematic

Note The shutoff valve downstream of the regulator must not be completely closed, as it is necessary that a small quantity of gas flows downstream to allow the outlet side to vent, when it is necessary to lower the pressure. Loosen the Type PRX pilot locknut and turn the adjusting screw slowly clockwise to increase outlet pressure and counterclockwise to decrease outlet pressure. Use a pressure gauge to monitor the outlet pressure until the desired pressure is reached. No adjustment is needed to the Type SA/2 pre-regulator.

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Monitoring Systems Monitoring regulation is overpressure protection by containment; therefore, there is no relief valve to vent to the atmosphere. When the working regulator fails to control the pressure, a monitor regulator installed in series, which has been sensing the downstream and control pressure, goes into operation to maintain the downstream pressure at a slightly higher than normal pressure. During an overpressure situation, monitoring keeps the customer on line. Also, testing is relatively easy. To perform a periodic test on a monitoring regulator, increase the outlet set pressure of the working regulator and watch the outlet pressure gauge to determine if the monitoring regulator takes over at the appropriate outlet pressure.

EZH~EZHSO Regulator Instruction Manual  

Fisher Controls instruction manual, courtesy of RMC Process Controls & Filtration, Inc. & www.RegulatorParts.com. Repair kits, orifices, dis...

EZH~EZHSO Regulator Instruction Manual  

Fisher Controls instruction manual, courtesy of RMC Process Controls & Filtration, Inc. & www.RegulatorParts.com. Repair kits, orifices, dis...

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