1900 Standard Series - Allied Valve Inc

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Materials (Contd.)O-Ring Selection (Contd.)O-Ring Temperature LimitsMaterials Durometer Description 1 Temp. Limits (°F) Temp. Limits (°C)50 N299-50 or N1009-50 -45 to +225 -43 to +107Nitrile70 N674-70 -40 to +250 -40 to +12190 N552-90 -40 to +250 -40 to +12170 2 N1173-70 -25 to +300 -31 to +14950 E1100-50 or E981-50 -65 to +212 -53 to +10070 E603-70 -65 to +212 -53 to +100Ethylene/Propylene75 & 80 3 E740-75 & E515-80 -70 to +250 -57 to +12190 E962-90 4 -70 to +500 -57 to +26075 5 E962-75 -60 to +250/400 -51 to +121/20450 V986-50 -15 to +400 -26 to +204Fluorocarbon75 V747-75 or V884-75 -15 to +400 -26 to +20490 V894-90 or V709-90 -15 to +400 -26 to +204NeopreneSilicone50 C267-50 -45 to +300 -43 to +14970 C944-70 or C873-70 -45 to +300 -43 to +14950 S595-50 -65 to +437 -53 to +22570 S604-70 -65 to +437 -53 to +225Teflon N/A Teflon -300 to +505 -184 to +263Kalrez 6 91 3018 -35 to +601 -37 to +31682 1050LF -42 to +550 -41 to +28875 4079 -58 to +601 -50 to +31665 1058 -40 to +500 -40 to +260Notes:1. Contact factory for O-Ring selection for various fluids.2. Consult factory before using. For use with freon 134A/ester oilservice.3. Set pressure ranges from durometer table for 70-75Durometer shall apply to these compounds (for nuclearservice, radiation environment).4. EPR962-90D can be used on steam service to lower pressurelimit of 15 psig (1.03 barg).5. Can be used upto 400°F (204°C) for Steam Applications.6. Consult factory before selecting.1900.44 | Dresser Consolidated ®
Accessories1900 Caps, Levers, and AccessoriesLifting MechanismsThe purpose of the lifting mechanism is to open the valvewhen the pressure under the valve disc is lower than the setpressure. These mechanisms are made in three basic types:plain lever, packed lever, and air-operated lifting device. Thelifting lever may be used as follows:(1) to lift the disc from the valve seat periodically during theoperation of equipment to be sure that the disc holder isnot frozen in the guide as a result of corrosion, coking,sulphur deposits, etc. This will ensure protection of the unitat all times. Operating pressure under the disc should beapproximately 75% of the set pressure when lifting inaccordance with the ASME Code; otherwise the leverassembly could be damaged.(2) to remove foreign particles which are sometimes trappedunder the seat as the valve closes. Immediate cleaningof the valve seat with the pressure of the media, by useof the lifting lever, will correct an otherwise leaking valve,save maintenance costs at a later date and in somecases will avoid a shutdown of the equipment.(3) to vent equipment to the atmosphere or dischargepiping.Packed LeverAs indicated by the name, this lifting lever assembly is packedaround the lever shaft, so that leakage will not occur aroundthe upper part of the valve when the valve is open or whenback pressure is present. The packed lifting lever should beused when positive protection against leakage is required.Bolted CapCONSOLIDATED Standard Safety Relief Valves are supplied withscrewed caps but bolted caps are available.GagThe purpose of the gag is to hold the safety relief valveclosed while equipment is being subjected to an operationalhydrostatic test. This is the only purpose for which the gag isintended, and it can be accomplished by pulling the gaghand-tight. Force should never be used. The gag shouldnever be left in the valve during the operation of theequipment. It should be removed each time after using andhung in a safe, convenient location and the sealing plugreinstated and properly torqued.Plain LeverThis lever assembly is not pressure-tight and should not beused where back pressure is present or where the escape ofvapor discharging from an open valve is undesirable aroundthe lever assembly.ASME B & PVC, Section VIII, LeverASME Codes require that a lifting lever must be supplied with the valve for steam, air, and hot water service over 140°F (60°C)applications. However, it need not be a sealed lifting mechanism. The ASME Codes do recommend that sealed liftingmechanisms be used; however, they are not mandatory. The lifting lever may be omitted under Code Case 2203. However,Dresser requires that all orders for pressure relief valves without levers or blowdown valves for steam, air, and water over140°F (60°C) state specifically that the valves are being purchased per Code Case 2203. The purchaser is responsible forobtaining jurisdictional authorization for use of Code Case 2203.Thermal Relief Valves: When ASME Code stamped valves are used for thermal relief applications, the ASME Code guidelinesshall be followed in regard to lifting levers.1900 Series Safety Relief Valve | 1900.45
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 18 and 19: Scope of Design (Contd.)1900 Restri
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 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
Page 72 and 73: Pressure / Temperature (Contd.)Pres
Page 94 and 95: Capacities (Contd.)Valve Capacity f
Page 96 and 97:
Capacities (Contd.)OrificeDesignati
Page 98 and 99:
Capacities (Contd.)OrificeDesignati
Page 100 and 101:
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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