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EZH and EZHSO Series Pressure Reducing Regulators

EZH and EZHSO Series Pressure Reducing Regulators
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EZH and EZHSO Series Pressure Reducing Regulators - 1

EZH and EZHSO Series Pressure Reducing Regulators Figure 1. Type EZH Pressure Reducing Regulator

EZH and EZHSO Series Pressure Reducing Regulators - 2

EZH and EZHSO Series Specifications The Specifications section lists the specifications for the EZH and EZHSO Series pressure reducing regulators. Factory specification is stamped on the nameplate fastened on the regulator at the factory. Available Configurations Type EZH: Spring-to-close pilot-operated pressure reducing regulator for low to high outlet pressure Type EZHSO: Spring-to-open pilot-operated pressure reducing regulator for low to high outlet pressure Type EZHOSX: Type EZH with a Type OS2 slam-shut device for overpressure (OPSO) or overpressure and underpressure (OPSO/UPSO)...

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EZH and EZHSO Series Pressure Reducing Regulators - 3

EZH and EZHSO Series Features • o Gas Emissions—Eliminates nuisance and N wasteful bleed gas to atmosphere by utilizing a self-contained control system, which bleeds 100% of the gas to the downstream system. • ubble-Tight Shutoff—A knife-edged metal plug B and soft seat provide bubble tight shutoff for use in applications where positive shutoff is required such as dead-end systems. • ong Life in Severe Service Applications—The L metal plug design deflects particles and debris away from the soft-seat, which gives excellent particle erosion resistance, prolonging service life. • ...

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EZH and EZHSO Series Pressure Reducing Regulators - 4

EZH and EZHSO Series Table 1. Main Valve Body Sizes, End Connection Styles and Body Ratings MAIN VALVE BODY SIZE MAIN VALVE BODY MATERIAL STRUCTURAL DESIGN RATING Table 2. Outlet Pressure Ranges OUTLET PRESSURE RANGE TYPE PILOT CONTROL SPRING INFORMATION EZHSO Series Spring Color Part Number Yellow Green Blue Black Wire Diameter Free Length Silver Gold Aluminum Table 3. Minimum Differential Pressures MAIN VALVE BODY SIZE TYPE MINIMUM DIFFERENTIAL For 90% Capacity 1.1 0.98 for standard version 0.21(1) for low differential version 14.0 for standard version 3.0(1) for low differential version...

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EZH and EZHSO Series Pressure Reducing Regulators - 5

EZH and EZHSO Series Pilot Descriptions The EZH and EZHSO Series pressure reducing regulators include a PRX Series pilot mounted on the main valve. EZH Series - Spring-To-Close Version Type PRX/120: Outlet pressure range of 14.5 to 435 psig / 1.00 to 30.0 bar. The Type PRX/120 can be used as the pilot on single stage pressure reducing regulators, as the monitor or working pilot in wide-open monitor systems or as the working pilots in working monitor systems. Type PRX/120-AP: Outlet pressure range of 435 to 1160 psig / 30.0 to 80.0 bar. The Type PRX/120-AP can be used as the pilot on single...

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EZH and EZHSO Series Pressure Reducing Regulators - 6

EZH and EZHSO Series PILOT CONTROL SPRING TYPE PRX PILOT UPPER DIAPHRAGM PILOT DISK PILOT BLEED RESTRICTION PILOT LOWER DIAPHRAGM REGULATOR ACTUATOR DIAPHRAGM MAIN VALVE DISK (PLUG) INLET PRESSURE LOADING PRESSURE PILOT SUPPLY PRESSURE OUTLET PRESSURE ATMOSPHERIC PRESSURE TYPE PRX: S - BLEED PORT B - SUPPLY PORT L - LOADING PORT A - SENSING PORT TYPE SA/2: V - SENSING PORT R - PILOT SUPPLY PORT M - INLET PORT Figure 2. Type EZH (Spring-to-Close Version) Operational Schematic FILTER PILOT BLEED RESTRICTION REGULATOR ACTUATOR DIAPHRAGM PILOT DISK PILOT LOWER DIAPHRAGM INLET PRESSURE LOADING...

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EZH and EZHSO Series Pressure Reducing Regulators - 7

EZH and EZHSO Series Table 4. Failure Mode Analysis PART NAME Filter blocked / Clogged Debris or aromatics present in the gas Pilot disk Pilot cannot be closed Pilot lower diaphragm REGULATOR REACTION MODE Type EZH Type EZHSO Decrease of supply pressure gives decrease of loading pressure Debris or aromatics present, Sour gas Increase loading pressure Pilot cannot control Debris or aromatics present, Sour gas Decrease loading pressure Pilot upper diaphragm Pilot cannot feed the regulator Debris or aromatics present, Sour gas Decrease loading pressure Regulator diaphragm Not proper...

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EZH and EZHSO Series Pressure Reducing Regulators - 8

TYPE EZHSO INLET PRESSURE LOADING PRESSURE INTERMEDIATE PRESSURE PILOT SUPPLY PRESSURE OUTLET PRESSURE ATMOSPHERIC PRESSURE TYPE PRX: S - BLEED PORT B - SUPPLY PORT L - LOADING PORT A - SENSING PORT TYPE SA/2: V - SENSING PORT R - PILOT SUPPLY PORT M - INLET PORT Figure 4. Wide-Open Monitoring System Operational Schematic Monitoring Systems Wide-Open Monitoring Systems (Figure 4) 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...

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EZH and EZHSO Series Pressure Reducing Regulators - 9

INLET PRESSURE LOADING PRESSURE INTERMEDIATE PRESSURE PILOT SUPPLY PRESSURE OUTLET PRESSURE ATMOSPHERIC PRESSURE TYPE PRX: S - BLEED PORT B - SUPPLY PORT L - LOADING PORT A - SENSING PORT TYPE SA/2: V - SENSING PORT R - PILOT SUPPLY PORT M - INLET PORT Figure 5. Working Monitoring System Operational Schematic Figure 4 shows an upstream wide-open monitor Type EZH (fail-to-close) and a downstream active regulator Type EZHSO (fail-to-open). In this installation, if the Type EZHSO regulator no longer controls downstream pressure, it will remain open, letting the Type EZH monitor regulator take...

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EZH and EZHSO Series Pressure Reducing Regulators - 10

EZH and EZHSO Series TYPE PRX TYPE SA/2 M EQUALIZER BYPASS MANOMETRIC DEVICE STEM VALVE PLUG MANOMETRIC DEVICE VALVE PLUG DISK MECHANISM BOX INLET PRESSURE LOADING PRESSURE PILOT SUPPLY PRESSURE OUTLET PRESSURE ATMOSPHERIC PRESSURE Figure 6. Type EZHOSX Operational Schematic Overpressure Protection Noise Abatement Trim Overpressuring any portion of a regulator or associated equipment may cause personal injury, leakage or property damage due to bursting of pressure-containing parts or explosion of accumulated gas. Provide appropriate pressure relieving or pressure limiting devices to ensure...

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EZH and EZHSO Series Pressure Reducing Regulators - 11

MECHANISM BOX (BM1) WITH 1 MANOMETRIC SENSING DEVICE (TYPE BMS1) TYPE BMS1 (RIGHT SIDE) TYPE BMS2 (LEFT SIDE) MECHANISM BOX (BM2) WITH 2 MANOMETRIC SENSING DEVICES (TYPES BMS1 AND BMS2) Figure 7. Types of Slam-Shut Installation

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EZH and EZHSO Series Pressure Reducing Regulators - 12

EZH and EZHSO Series FIRST-STAGE RESET PIN (WHITE) MECHANISM BOX SECOND-STAGE RESET SHAFT Figure 8. Slam-Shut Device in Open Position SETPOINT ADJUSTMENT RING TRAVEL STOP Figure 9. Slam-Shut Device in Closed Position

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EZH and EZHSO Series Pressure Reducing Regulators - 13

EZH and EZHSO Series Slam-Shut Device Principle of Operation The slam-shut device on the Type EZHOSX (Figure 6) can provide either overpressure (OPSO) or overpressure and underpressure (OPSO/UPSO) protection by completely shutting off the flow of gas to the downstream system. Pressure is registered on one side of the diaphragm, piston or bellows and is opposed by the setpoint control spring of the manometric sensing device. The Type OSE slam-shut valve tripping pressure is determined by the setting of the control spring. Overpressure: when the downstream pressure increases above the...

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