Bulletin 71.1:Y690A May 2012 Y690A Series Pressure Reducing Regulators W7293 W7291 TYPE Y690A TYPE Y690AH Figure 1. Y690A Series Direct-Operated Pressure Reducing Regulators Features Introduction   • asy Conversion Between Constructions— E Converts easily from the Type Y690A to the Type Y690AM with two O-rings and one machine screw. The Y690A Series self-contained, spring-loaded regulators (Figure 1) provide economical pressure reducing control in a variety of commercial and industrial applications. The Y690A Series design is ideally suited to control gas supply to in-plant processing equipment. The rugged casings and sliding pusher post design withstand the full 150 psig / 10.3 bar inlet pressure at both the inlet and outlet connections. The sliding pusher post design prevents damage to internal parts if the downstream pressure exceeds the setpoint. Because these regulators can withstand the full inlet pressure, a downstream or internal relief valve is not required to protect the downstream side of the regulator.   • our Gas Service Capability—For sour gas S applications, the Y690A Series regulators are available in materials that comply with NACE International Standards MR0175 and MR0103.   • nlet Pressure Equals Outlet Pressure—Full I inlet pressure capability on the downstream side of the regulator.   • orrosion Resistance—Multiple regulator constructions C are available in a variety of materials for compatibility with corrosive process gases. D102592X012   • ultiple Applications—The Y690A Series can be used M for a wide variety of gases including air, nitrogen, natural gas, sour gas, butane, and propane. www.fisherregulators.com

Available Configurations Type Y690A: Direct-operated pressure reducing regulator for outlet pressures up to 7-inches w.c. / 17 mbar equipped with a pitot tube. TypeY690AH: Direct-operated pressure reducing regulator for outlet pressures up to 7 psig / 483 mbar equipped with a pitot tube. Type Y690AM: Direct-operated pressure reducing regulator for outlet pressures up to 7-inches w.c. / 17 mbar equipped with a blocked throat and O-ring stem seal. The lower diaphragm casing is tapped 1/2 NPT for control line connection. Type Y690AHM: Direct-operated pressure reducing regulator for outlet pressures...

VALVE DISK INLET PRESSURE OVERPRESSURE SPRING Figure 2. Y690A Series Operational Schematic Refer to Figure 2. When downstream demand decreases, the pressure under the diaphragm increases. This pressure overcomes the regulator setting (which is set by a spring). Through the action of the sliding pusher post assembly, lever, and valve stem the valve disk moves closer to the orifice and reduces gas flow. If demand downstream increases, pressure under the diaphragm decreases. Spring force pushes the pusher post assembly downward, the valve disk moves away from the orifice, and the gas flow increases....

I I DOWNSTREAM CONTROL PRESSURE Figure 3. Types Y690AH and Y690AHM Actuator Casing Drainage Schematic Table 5. Outlet Pressures and Spring Part Numbers Y690A Series regulators may be installed in any orientation as long as flow through the body matches the direction of the arrow cast on the body. Normal installation is with the spring case barrel vertical above or below the diaphragm case. However, when using a Type Y690A or Y690AM regulator, for proper operation to achieve the published capacities, the spring case barrel should be installed pointed down. For actuator casing drainage of the Types...

Table 6. Types Y690A and Y690AM Capacities BODY SIZE PRESSURE RANGE, PART NUMBER, CAPACITIES IN SCFH / Nm3/h OF 0.6 SPECIFIC GRAVITY NATURAL GAS<1> Orifice Size 1. Deviation from setpoint is -1 to 2-inches w.c. / -2.5 to 5 mbar. I I - Shaded areas indicate maximum allowable inlet pressure i:

Table 6. Types Y690A and Y690AM Capacities (continued) BODY SIZE PRESSURE RANGE, PART NUMBER, CAPACITIES IN SCFH / Nm3/h OF 0.6 SPECIFIC GRAVITY NATURAL GAS'1' Orifice Size 1. Deviation from setpoint is -1 to 2-inches w.c. / -2.5 to 5 mbar. I I - Shaded areas indicate maximum allowable inlet pressure i:

Table 7. Types Y690AH and Y690AHM Capacities

Table 7. Types Y690AH and Y690AHM Capacities (continued) Table 7. Types Y690AH and Y690AHM Capacities

Table 7. Types Y690AH and Y690AHM Capacities (continued)

CONTROL LINE Universal NACE Compliance Optional materials are available for applications handling sour gases. These constructions comply with the recommendations of all NACE International sour service standards. The manufacturing processes and materials used by Fisher® Controls assure that all products specified for sour gas service comply with the chemical, physical, and metallurgical requirements of NACE MR0175/ISO 15156 and/or NACE MR0103. Customers have the responsibility to specify correct materials. Environmental limitations may apply and shall be determined by the user. Ordering Information...

Ordering Guide □ Y690AH (high pressure with internal registration)*** □ Y690AHM (high pressure with external registration)* Body Size (Select One) Body Material and End Connection Style (Select One) Ductile Iron Body Spring Case Material (Select One) Diaphragm Case Material (Select One) Trim Material (Select One) Diaphragm Material (Select One) □ Nitrile (NBR) with PTFE Protector** Disk Material (Select One) Orifice Size (Optional) Outlet Pressure Range (Select One) □ 15-inches w.c. to 1.2 psig / 37 mbar to 0.08 bar, Yellow** □ 1.2 to 2.5 psig / 0.08 to 0.17 bar, Light green*** □ 2.5 to 4.5 psig...

Industrial Regulators Emerson Process Management Middle East and Africa Dubai, United Arab Emirates Emerson Process Management Emerson Process Management Tescom Corporation For further information visit www.fisherregulators.com The Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are the property of their prospective owners. Fisher is a mark owned by Fisher Controls International LLC, a business of Emerson Process Management. The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their...