Description
TECHNICAL DATASHEET
3″ 125LB GATE VALVE (OS&Y)
1. General Specifications
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Item
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Specification
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Valve Type
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Rising Stem Gate Valve (OS&Y – Outside Screw and Yoke)
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Nominal Size
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3 inches (3″) / DN80
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Pressure Class
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125 LB (Class 125)
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End Connection
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Flanged Ends
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Flange Standard
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ASME B16.1 (Class 125 Cast Iron Flange – Raised Face / Flat Face)
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Face-to-Face Dimension
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ASME B16.10 / MSS SP-70
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Test Standard
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API 598 / MSS SP-70
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- Design Parameters
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Item
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Unit/Standard
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Parameter
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Design Pressure
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psi
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200 psi (Saturated Steam) / 175 psi (Non-Shock WOG) *
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Service Media
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–
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Water, Oil, Gas (WOG) or Steam (depending on conditions)
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Operating Temp.
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°C / °F
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-29°C to 220°C (-20°F to 430°F) **
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Operation
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–
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Handwheel (Manual)
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** Pressure rating per MSS SP-70 / ASME B16.1 for Class 125.*
*** Temperature range depends on trim materials (Seat/Seal).*
- Material of Construction (M.O.C.)
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Part Name
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Material Required
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Standard / Grade (Ref.)
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1. Body
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DI (Ductile Iron)
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ASTM A536 (60-40-18) or ASTM A395
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2. Bonnet
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Ductile Iron
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ASTM A536
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3. Wedge (Gate)
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DI (Ductile Iron)
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ASTM A536 (Fully Guided)
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4. Seat Ring (Seat Face)
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Bronze (Integral or Ring)
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ASTM B62 (C83600) or ASTM B61
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5. Stem
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Stainless Steel
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ASTM A276 Type 410 / 304 / 316
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6. Stem Nut
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Bronze / Aluminum Bronze
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High-strength wear-resistant alloy
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7. Packing
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Flexible Graphite / PTFE
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–
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8. Gasket
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Compressed Non-Asbestos / Graphite
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–
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9. Bolts/Nuts
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Carbon / Alloy Steel
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ASTM A193 B7 / A194 2H
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10. Handwheel
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Cast Iron / Ductile Iron
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–
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- Main Dimensions (Reference)
Note: Dimensions are for reference only. Final dimensions to be verified per manufacturer’s drawing. (Unit: mm / inch)
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Description
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Dimension
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Remarks
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Face-to-Face (L)
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203 mm (8.0″)
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Per ASME B16.10 / MSS SP-70
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Flange Diameter (D)
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191 mm (7.5″)
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ASME B16.1 Class 125
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Bolt Circle Diam. (C)
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152.4 mm (6.0″)
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ASME B16.1 Class 125
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Bolt Holes (n-ød)
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4-19 mm (4-0.75″)
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Standard 4 holes
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Flange Thickness (T)
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23.9 mm (0.94″)
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ASME B16.1 Class 125
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Handwheel Diameter (W)
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Approx. 250 mm (10″)
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Varies by manufacturer
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Top-to-Open Height (H)
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Approx. 450 mm (17.7″)
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From stem top to handwheel (Ref.)
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- Inspection & Testing (Per API 598 / MSS SP-70)
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Test Description
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Medium
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Pressure (psi)
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Standard
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Shell (Hydrostatic)
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Water
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300
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API 598
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Seat (High Pressure)
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Water / Air
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220
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API 598
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Backseat Test
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Water / Air
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As required
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API 598
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Low Pressure Pneumatic
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Air
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60 – 80
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Optional / If required
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- Options & Notes
- Stem Upgrade: 304/316 Stainless Steel, Monel.
- Seat Replacement: Renewable Bronze Seat Rings (optional).
- Operation: Gear Operator (for higher torque applications).
- Coating: Epoxy Coated (Internal & External) per AWWA C550 (e.g., RAL 5005 Blue).
- Flange Face: Confirm if Flat Face (FF) is required for mating with cast iron flanges (recommended) or Raised Face (RF).
Remarks:
- Pressure Rating: This datasheet is based on Class 125 rating per MSS SP-70 and ASME B16.1 standards. Working pressure is typically 200 psi for saturated steam and 175 psi for cold water/oil/gas (non-shock) .
- Wedge Material: The wedge is specified as Ductile Iron with Bronze seating surfaces (integral or welded).
- Flange Standard: Flanges are designed per ASME B16.1 Class 125, which is the correct standard for cast iron and ductile iron flanges in this pressure class
GUATANTEE:
SAVVY VALVES is committed to delivering exceptional product quality and worry-free after-sales service. Our valves are guaranteed to provide a minimum service life of 12 months, during which we will supply all necessary spare parts and detailed maintenance instructions free of charge. Within the warranty period, if any non-human-induced damage occurs, we will replace components at no cost and provide professional technical support. After the warranty expires, customers only need to pay for the cost of spare parts, while still benefiting from discounted maintenance services. Our goal is to help clients reduce operational costs and enhance production efficiency through reliable quality and comprehensive after-sales support. Whether for technical inquiries or maintenance needs, our expert team will respond promptly to ensure your valve system maintains optimal performance at all times.
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