3"-125LB Cast Iron Metal Seated Rising Stem Gate Valve

3″-125LB Cast Iron Metal Seated Rising Stem Gate Valve

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Description

TECHNICAL DATASHEET

3″ 125LB GATE VALVE (OS&Y)
Project / P.O. No.: ____________________
Tag No.: ____________________
Qty: ______ Units

1. General Specifications

Item Specification
Valve Type Rising Stem Gate Valve (OS&Y – Outside Screw and Yoke)
Nominal Size 3 inches (3″) / DN80
Pressure Class 125 LB (Class 125)
End Connection Flanged Ends
Flange Standard ASME B16.1 (Class 125 Cast Iron Flange – Raised Face / Flat Face)
Face-to-Face Dimension ASME B16.10 / MSS SP-70
Test Standard API 598 / MSS SP-70

2. Design Parameters

Item Unit/Standard Parameter
Design Pressure psi 200 psi (Saturated Steam) / 175 psi (Non-Shock WOG) *
Service Media – Water, Oil, Gas (WOG) or Steam (depending on conditions)
Operating Temp. °C / °F -29°C to 220°C (-20°F to 430°F) **
Operation – Handwheel (Manual)

** Pressure rating per MSS SP-70 / ASME B16.1 for Class 125.*
*** Temperature range depends on trim materials (Seat/Seal).*

3. Material of Construction (M.O.C.)

Part Name Material Required Standard / Grade (Ref.)
1. Body DI (Ductile Iron) ASTM A536 (60-40-18) or ASTM A395
2. Bonnet Ductile Iron ASTM A536
3. Wedge (Gate) DI (Ductile Iron) ASTM A536 (Fully Guided)
4. Seat Ring (Seat Face) Bronze (Integral or Ring) ASTM B62 (C83600) or ASTM B61
5. Stem Stainless Steel ASTM A276 Type 410 / 304 / 316
6. Stem Nut Bronze / Aluminum Bronze High-strength wear-resistant alloy
7. Packing Flexible Graphite / PTFE –
8. Gasket Compressed Non-Asbestos / Graphite –
9. Bolts/Nuts Carbon / Alloy Steel ASTM A193 B7 / A194 2H
10. Handwheel Cast Iron / Ductile Iron –

4. Main Dimensions (Reference)

Note: Dimensions are for reference only. Final dimensions to be verified per manufacturer’s drawing. (Unit: mm / inch)

Description Dimension Remarks
Face-to-Face (L) 203 mm (8.0″) Per ASME B16.10 / MSS SP-70
Flange Diameter (D) 191 mm (7.5″) ASME B16.1 Class 125
Bolt Circle Diam. (C) 152.4 mm (6.0″) ASME B16.1 Class 125
Bolt Holes (n-ød) 4-19 mm (4-0.75″) Standard 4 holes
Flange Thickness (T) 23.9 mm (0.94″) ASME B16.1 Class 125
Handwheel Diameter (W) Approx. 250 mm (10″) Varies by manufacturer
Top-to-Open Height (H) Approx. 450 mm (17.7″) From stem top to handwheel (Ref.)

5. Inspection & Testing (Per API 598 / MSS SP-70)

Test Description Medium Pressure (psi) Standard
Shell (Hydrostatic) Water 300 API 598
Seat (High Pressure) Water / Air 220 API 598
Backseat Test Water / Air As required API 598
Low Pressure Pneumatic Air 60 – 80 Optional / If required

6. 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:

  1. 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) .

  2. Wedge Material: The wedge is specified as Ductile Iron with Bronze seating surfaces (integral or welded).

  3. 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.

Prepared by: __________________
Date: __________________

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