1900 Standard Series - Allied Valve Inc

Scope of Design (Contd.)Product Features - 1900 Flanged SeriesAdjusting RingThe adjusting ring in the Consolidated safety relief valve ispreset to predetermined positions prior to putting the valvein service. Presetting reduces the necessity of popping thevalve in service to ascertain that the ring has been setproperly for attaining the necessary lift and relieving capacity.Simple Blowdown AdjustmentAdjustment of Consolidated safety relief valve blowdown, orreseating pressure, is by means of a single adjusting ring.When moved upward, blowdown is increased (lowering thereseating pressure), or when moved downward, theblowdown is decreased (raising the reseating pressure). Thesimplicity and advantages of this adjustment are obviouswhen comparing valves having two or more adjusting ringseach of which affect valve action as well as blowdown.Minimum Guiding AreaGuiding areas greater than those required to align the seatingsurfaces are undesirable in a safety relief valve, especially thoseused in the process industries. The smaller the guiding area ofthe valve (when corrosion or contamination from the flowingmedium build up in the valve guiding surfaces) the less tendencythe guiding area will have to stick and hinder valve operation.NozzleThe nozzle is a pressure containing component in constantcontact with the process media in both the open and closedvalve positions. To ensure maximum reliability and safety,CONSOLIDATED flanged SRV nozzles are made from forgings,investment castings, or centrifugal castings.Spindle Pocket ConnectionThe connection between the spindle and disc holder in aConsolidated safety relief valve is a positive method ofattachment. The Inconel snap ring and groove design make itvirtually impossible to remove the spindle from the disc holder,unless the ring is compressed intentionally. This designrequires a minimum amount of effort to disassemble duringmaintenance.Design SimplicityConsolidated safety relief valves embody a minimum numberof component parts which results in a savings by minimizingspare parts inventory and simplifying valve maintenance.Maximum Seat TightnessSeat finish in a safety relief valve is of the utmost importance;otherwise, valve leakage will occur.Consolidated safety relief valve seats are precision machinedand lapped. This ensures positive seating and prevents lossof contained media.The Thermodisc design provides a tighter closure andcompensates for temperature variations around the peripheryof the nozzle. Thermal distortion, which produces seatleakage, is minimized in steam service.Cap and Lever InterchangeabilityMany times it is necessary to change the type of cap or leverin the field after a valve has been installed. All Consolidatedsafety relief valves are supplied so they can be converted toany type of lever or cap desired. It is not necessary to removethe valve from the installation, nor will the set pressure beaffected when making such a change.Valve InterchangeabilityA Consolidated safety relief valve may be converted from thestandard, conventional type valve to the bellows type, or to theO-Ring seat seal type, Thermodisc seat Liquid Trim, or viceversa, requiring a minimum number of new parts. This resultsin lower costs.Quality MaterialAll Consolidated safety relief valve castings and forgings aremade to ASTM/ASME specifications and are subject tomany rigid inspections, ensuring the highest degree ofquality.Coupled with the highest quality workmanship, this ensurescontinuous protection and long, trouble-free valve life.1900.12 | Dresser Consolidated ®