Bulletin 71.2:EZH and EZHSO April 2014 EZH and EZHSO Series Pressure Reducing Regulators Figure 1. Type EZH Pressure Reducing Regulator • 1500 psig / 103 bar Inlet / Outlet Rating • Common Body Platform • Integral Slam Shut Configurations Available • Bubble-Tight Shutoff • Full Usable Capacity • In-Line Maintenance • Precise Pressure Control   • Long Life in Severe Service Applications • High Turn Down Capability •    PS 1 through 4 / DN 25 through N 100 Body Sizes Available • Optional Whisper Trim™ Cage Noise Abatement (Up to 8 dBA)   • Integral Slam Shut for Overpressure and Underpressure Protection D103081X012 • Spring-to-Close and Spring-to-Open Versions

Bulletin 71.2:EZH and EZHSO Features   •  ong Life in Severe Service Applications—The L EZH and EZHSO Series utilize a metal plug design to deflect particles and debris away from the softseat, which gives enhanced resistance to particle erosion to provide a longer service life. In addition, the EZH and EZHSO Series can be constructed with Fluorocarbon (FKM) soft parts to extend service life in applications where liquid aromatics are entrained in the gas.   •  ain Diaphragm—The main diaphragm is M Nitrile (NBR) reinforced with fabric and coated with a PVC, which protects and extends the service...

Bulletin 71.2:EZH and EZHSO 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...

Bulletin 71.2:EZH and EZHSO Table 1. Main Valve Body Sizes, End Connection Styles and Body Ratings MAIN VALVE BODY SIZE NPS MAIN VALVE BODY MATERIAL STRUCTURAL DESIGN RATING Table 2. Outlet Pressure Ranges OUTLET PRESSURE RANGE PILOT CONTROL SPRING INFORMATION Type EZHSO Spring Color Part Number Yellow Green Blue Black Silver Gold Aluminum Table 3. Minimum Differential Pressures(1) MAIN VALVE BODY SIZE TYPE MINIMUM DIFFERENTIAL For 90% Capacity 1. When using a Type SA/2 pilot supply filter regulator, the differential pressure across the regulator must be a least 45 psid / 3.1 bar d for optimum...

Bulletin 71.2:EZH and EZHSO Pilot Descriptions The EZH and EZHSO Series pressure reducing regulators include a PRX Series pilot mounted on the EZH and EZHSO Series main valves for pressurereducing or monitoring applications. PRX Series pressure reducing pilots have the ability to handle a wide range of setpoints from 14.5 to 1160 psig / 1.00 to 80.0 bar. 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 pilot or as the working pilot in wide-open monitor systems or as...

Bulletin 71.2:EZH and EZHSO PILOT CONTROL SPRING PILOT UPPER DIAPHRAGM PILOT BLEED RESTRICTION PILOT DISK PILOT LOWER DIAPHRAGM REGULATOR ACTUATOR DIAPHRAGM CHECK VALVE 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 MAIN VALVE DISK (PLUG) TYPE SA/2: V - SENSING PORT R - PILOT SUPPLY PORT M - INLET PORT Figure 2. Type EZH (Spring-to-Close Version) Operational Schematic PILOT BLEED RESTRICTION PILOT DISK REGULATOR ACTUATOR DIAPHRAGM CHECK VALVE A PILOT LOWER DIAPHRAGM TYPE EZHSO...

Bulletin 71.2:EZH and EZHSO Table 4. Failure Mode Analyses PART NAME REGULATOR TYPE Filter blocked / Clogged Debris or aromatics present in the gas Decrease of supply pressure gives decrease of loading pressure Pilot cannot be closed Debris or aromatics present, Sour gas Increase loading pressure Pilot disk REGULATOR REACTION MODE Pilot lower diaphragm 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 performance...

CHECK VALVE CHECK VALVE TYPE EZHSO 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 4. Wide-Open Monitoring System Operational Schematic Wide-Open Monitoring Systems (Figure 4) Working Monitoring Regulators (Figure 5) There are two types of wide-open monitoring systems: upstream and downstream. The difference between upstream and downstream monitoring is that the functions of the regulators are reversed. Systems...

Bulletin 71.2:EZH and EZHSO TYPE PRX-120 CHECK VALVE CHECK VALVE TYPE EZH WORKER REGULATOR TYPE EZH MONITOR REGULATOR 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 Overpressure Protection Overpressuring any portion of a regulator or associated equipment may cause personal injury, leakage or property damage due to bursting of pressure-containing...

Bulletin 71.2:EZH and EZHSO TYPE PRX V R CHECK VALVE EQUALIZER BYPASS MANOMETRIC DEVICE STEM VALVE PLUG MANOMETRIC DEVICE INLET PRESSURE VALVE PLUG DISK LOADING PRESSURE PILOT SUPPLY PRESSURE OUTLET PRESSURE COURSE CLAPET ATMOSPHERIC PRESSURE Figure 6. Type EZHOSX Operational Schematic Noise Abatement Trim Whisper Trim™ cage provides effective attenuation of aerodynamic noise in gas applications involving high pressure drop ratios. Aerodynamic noise is generated by the turbulence created in the flow of gas as the fluid passes through the port. To achieve effective noise attenuation, a Whisper...