1900 Standard Series - Allied Valve Inc

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Scope of Design (Contd.)1900 Restricted Lift ValvesThe 1900 series is offered in orifice sizes ranging from the smallest “D” size to the largest “W” size. In order to accomplish certainvalve functions some special considerations have to be made. Such a case is the D and E orifice designs noted below.The D and E valves are restricted lift versions of the “F” orifice valve. The lift is restricted by a limit washer to provide theequivalent effective orifice area for a “D” or “E” orifice. This design is available with a balanced bellows configuration and isdesigned for back pressure applications.The standard 1900 Series are available with restricted lifts in orifices ranging from “F” to “W” for compressible media only.Restricted LiftD and E Orifice OnlyGuideLimit WasherDisc HolderConventionalLimit WasherBalanced Bellows1900.16 | Dresser Consolidated ®
Scope of Design (Contd.)Soft Seat ApplicationsCloseness of Operating Pressure to SetPressureWhere the operating pressure is close to the set pressure, seattightness can be maintained at relatively higher operatingpressures.Compressor Discharge and PositiveDisplacement Pump ServiceMechanical vibration and pressure waves could lift the valvedisc with each stroke and may cause flat metal-to-metal seatsto rub together and become damaged.The 45° metal-to-metal load bearing seats in the ConsolidatedO-Ring seat seal assure true alignment,aided by full systempressure behind the O-Ring, which effectively seals againstleakage.Corrosive ServicesIn some services, corrosion of the seating surfaces is thecause of valve leakage. In this type of service, the ConsolidatedO-Ring seat seal will protect the metal seat on the nozzleagainst contact of the corrosive fluid thereby maintaininggreater tightness.Foreign Matter and Slurry ServiceMany times foreign material such as pipe scale, weldingbeads, sand dust particles, etc. may damage the metal-tometalseating surfaces in a valve of this type when it is openand flowing.The Consolidated O-Ring seat seal is designed to absorb theimpact of most foreign particles without damage.Hot Water Boiler ServiceWhen a safety relief valve opens hot water flashes into steamat the seating surfaces and solid particles which float to thewater surface are driven against the seating surfaces at steamvelocities. Consolidated O-Ring seat seal valves can withstandthis type of service and remain tight to a greater degree thanmetal-to-metal seat valves.Consolidated uses proven quality Teflon ® O-Ring seats for thisservice. In some pressure/temperature applications, Teflon ® isnot resilient, and leakage may occur.BenefitsSafety Relief Valve leakage which is aggravated by any causeis usually costly. In many cases, expensive product is lost andmaintenance costs increased. Consolidated O-Ring seat sealvalves are designed to eliminate leakage in troublesomeapplications and reduce overall costs. Should leakage occur,it is much simpler and less expensive to replace the O-Ringthan to maintain metal-to-metal seats.O-Ring Conversion1900 Series Consolidated metal seated valves can beconverted to O-Ring seat seals by installing a few basic partsprovided in a conversion kit.1900-DA soft seats without bellows1900 Series Safety Relief Valve | 1900.17
Page 1: Pressure Relief Valves1900 Standard
Page 4 and 5: Conversion TableAll the USCS values
Page 6 and 7: Scope of Design1900 Series Overview
Page 8 and 9: Scope of Design (Contd.)1900 Series
Page 10 and 11: Scope of Design (Contd.)1900 Series
Page 12 and 13: Scope of Design (Contd.)How Pressur
Page 14 and 15: Scope of Design (Contd.)Product Fea
Page 16 and 17: Scope of Design (Contd.)1900 Steam
Page 20 and 21: Scope of Design (Contd.)1900 Soft S
Page 22 and 23: MaterialsConventional SRV 1900 Seri
Page 24 and 25: Materials (Contd.)Conventional SRV
Page 26 and 27: Materials (Contd.)Conventional SRV
Page 28 and 29: Materials (Contd.)1900 Soft Seat (D
Page 30 and 31: Materials (Contd.)1900 Liquid Trim
Page 32 and 33: Materials (Contd.)1900 Sour Gas (SG
Page 34 and 35: Materials (Contd.)Corrosive Service
Page 42 and 43: Materials (Contd.)Low Temperature (
Page 44 and 45: Materials (Contd.)1900 Valves for L
Page 46 and 47: Materials (Contd.)O-Ring Selection
Page 48 and 49: Accessories (Contd.)1900 Caps, Leve
Page 50 and 51: Accessories (Contd.)Bolted CapConso
Page 52 and 53: Accessories (Contd.)Cap and Lever C
Page 54 and 55: Dimensions & Weights1900 Flanged Se
Page 56 and 57: Dimensions & Weights (Contd.)ValveT
Page 64 and 65: Pressure / Temperature (Contd.)Valv
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Pressure / Temperature (Contd.)Valv
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Pressure / Temperature (Contd.)Valv
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Pressure / Temperature (Contd.)Pres
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Capacities (Contd.)Valve Capacity f
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Capacities (Contd.)OrificeDesignati
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Capacities (Contd.)OrificeDesignati
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Valve Configuration CodeMATERIAL CL
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Valve Configuration Code (Contd.)Le
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1900 Standard Series - Allied Valve Inc

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