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Double DB Double Isolation Plug Valve
Brand: NordstromHigh-performance, double-isolation steel plug valve designed for critical shutoff applications where absolute shutoff is required for safety, environmental or process reasons.
Features- Broad application versatility due to robust design, making valve well-suited for isolation in compressor, pump, meter, water or gas injection system applications
- Improved plant and personnel safety assured by double-isolation design
- Installation ease from compact design with the same face-to-face dimension as a single valve
- Greater process control via proven Dynamic Balance® pressure-balanced and sealing technology to prevent unequal pressure above/below the plug
- Low lifecycle costs compared to two single valves
Specifications
Brand
Actuator Type
- Electric
- Hydraulic
- Pneumatic
- Worm Gear Operator
Approvals & Certifications
- API
- CAN/CSA Z245.15 Steel Valves & Z299.3
- ISO 9001
Approvals & Certifications
- API 6D
Ball Material
- Ball-Balance, Thrust & Retaining Washer: Stainless Steel
- Ball-Balance, Thrust: Monel K-500
Bearing Material
- Bearing (Thrust Washer): Carbon Steel Backed
- Bearing (Thrust Washer): Glass/PTFE Fiber
- Bearing (Thrust Washer): Stainless Steel Backed
Cap Material
- Adjusting Screw: Carbon Steel
Cover Material
- Carbon Steel
- Weatherseal Cover: Neoprene
Diaphragm Material
- Thick: Carbon Steel
- Thin: Stainless Steel
Enclosure, Body Material
- Carbon Steel (A216 Grade WCC, A352 Grade LCC)
- Low Cast Alloy Steel (A487 Grade 4N)
Flange Material
- Gear: Wrought Carbon Steel
Flange Size - 1-1/2” (DN 40)
- 1-1/2" (DN 40) - 150#
- 1-1/2" (DN 40) - 1500#
- 1-1/2" (DN 40) - 2500#
- 1-1/2" (DN 40) - 300#
- 1-1/2" (DN 40) - 600#
Flange Size - 1” (DN 25)
- 1" (DN 25) - 150#
- 1" (DN 25) - 1500#
- 1" (DN 25) - 2500#
- 1" (DN 25) - 300#
- 1" (DN 25) - 600#
Flange Type
- Raised Face (RF)
- RTJ - Ring Typical Joint
Gasket Material
- Graphite
- Stainless Steel
Gland Material
- Gland - Wrench-Operated & Stem Packing: Ductile Iron
- Gland Retainer: Carbon Steel
Indication
- Position Indicator
- Visual Indicator
Materials of Construction
- Check Valve & Grease Fitting: Stainless Steel
- Check Valve, Stop Collar, Thrust Button, Key & Sealant Fitting: Wrought Carbon Steel
- Equalizer: Alloy Steel
- Thrust Button: Nickel Steel
- Washer: Zinc
Media
- Air
- Fluids
- Natural Gas
- Sour Natural Gas
Name Plate, Tag Material
- Stainless Steel
Nut & Bolt Material
- Bolting Cover, Gland & Gear Flange: Carbon Steel (A193 Grade B7 & B7M, A320 Grade L7 & L7M)
Operating Pressure
- Carbon Steel ASTM A352 Grade LCC & ASTM A216 Grade WCC - psig: 80 to 6,250 (kPa: 551.6 to 43,090, bar: 5.51 to 430.9)
- Stainless Steel ASTM A351 Grade CF8M - psig: 10 to 6,000 (kPa: 69 to 41,370, bar: 0.69 to 413.7)
Packing Material
- Packing-Adjusting Screw: Braided Carbon Filament Yarn Graphite
- Packing-Stem: Fluoropolymer Compound
Plug Material
- Alloy Steel HRC 22, Max.
- Carbon Steel (A48 Grade 45B/50B)
- Ductile Iron
- Inconel X-750
- Stainless Steel
- Steel
Pressure Type
- Elevated
Proof Pressure
- Carbon Steel ASTM A352 Grade LCC & ASTM A216 Grade WCC psig: 325 to 6,875 (kPa: 2,241 to 47,400, bar: 22.4 to 474) - Hydrostatic Seat Test
- Carbon Steel ASTM A352 Grade LCC & ASTM A216 Grade WCC) psig: 450 to 9,375 (kPa: 3,103 to 64,640, bar: 31.03 to 646.4) - Hydrostatic Body (Shell) Test
Ring Material
- Retaining & Spacer: Carbon Steel
- Split: Alloy Steel
Screw Material
- Adjusting: Alloy Steel
- Adjusting: Carbon Steel
Seat / Seal Material
- Ball Seat - Thrust: Alloy Steel
- Ball Seat - Thrust: Stainless Steel
- Ball Seat - Thrust: Stellite Hardfaced
- Gasket - Pressure Seal: Carbon Steel
- Weatherseal: Buna-N
- Weatherseal: Neoprene
Service Temperature
- CAN/CSA Z245-15 Ratings: -29° to 120° C (-20.2° to 248° F)
- Carbon Steel ASTM A352 Grade LCC & ASTM A216 Grade WCC: -29° to 450° C (-20° to 800° F)
- Stainless Steel ASTM A351 Grade CF8M: -45° to 800° C (-50° to 1,500° F)
Spring Material
- Disk: Alloy Steel
- Inconel X-750
- Pin-Spring Disk: Carbon Steel
- Stainless Steel
Stem Material
- 316 Stainless Steel
- Nitronic 60
- Round w/ Keyway: Wrought Carbon or Low Alloy Steel, HRC 22, Max.
- Stainless Steel Double Age Hardened
- Weatherseal Stem: Buna-N
- Weatherseal Stem: Polyurethane
Temperature Range
- Hard-Surfaced Body & Plug Suitable for 371° to 816° C (700° to 1,500° F)
- Sour Gas Valves Conforming to NACE MR-0175, API-6D & B16.34, Suitable for -29° to 232° C (-20° to 450° F)
- Valves Suitable for Moderately High Temperatures 232° to 427° C (450° to 800° F)
Wetted Materials
- 316 Stainless Steel
- 630 Stainless Steel Drive Train
- Sour Gas