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Materials (Contd.)<strong>1900</strong> Soft Seat (DA) Option<strong>1900</strong> Soft Seat (DA) Safety relief <strong>Valve</strong>Disc HolderRetainer Lock ScrewO-Ring Seat SealO-Ring RetainerNozzleD Thru J OrificeDisc HolderDisc RetainerDiscRetainer Lock ScrewO-Ring Seat SealO-Ring RetainerNozzleK Thru T Orifice<strong>Standard</strong> Material for <strong>1900</strong> SoftSeat (DA) Safety Relief <strong>Valve</strong>sPart Name Materials 1Disc (K-T Orifice)316 Stainless SteelDisc Holder 2316 Stainless SteelBonnetASME SA352 LCC CSDisc Retainer<strong>Inc</strong>onel X750O-Ring Retainer 3316 Stainless SteelRetainer Lock Screw (Not Shown) 3 316 Stainless SteelO-Ring Seat Seal Select 4Notes:1. Balance of Materials same as <strong>1900</strong> standard construction2. Disc Holder material for D-J orifice, will be Monel for “M” variations and Hastelloy C for “H” variations.3. O-Ring Retainer material will be Monel for “M” variations and Hastelloy C for “H” variations. The retainer lock screw will beMonel with Nylon locking feature in the “M” variations and Hastelloy C with Nylon locking feature in the “H” variations.4. Refer to pages <strong>1900</strong>.41 & <strong>1900</strong>.42 for O-Ring Selection (Durometer and Temperature Limits). See Technical InformationSection for application.<strong>1900</strong>.26 | Dresser Consolidated ®
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