Class 1500 Closed Die Forged Steel Globe Valve

Class 1500 Closed Die Forged Steel Globe Valve

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Description

Forged Steel Globe Valve Technical Data Sheet

1. Product Overview

  • Product Name: Forged Steel Globe Valve

  • Valve Type: Globe Valve

  • Design Standard: API 602 “Steel Gate, Globe, and Check Valves for Sizes DN 100 and Smaller for the Petroleum and Natural Gas Industries”

  • Bonnet Type: PSB (Pressure Seal Bonnet)

  • Operation: Manual (Handwheel)

  • Connection Type: Welding Ends (BW – Butt Welding / SW – Socket Welding)

  • Body Material: Forged Steel (e.g., A105)

2. Design Codes & Standards

Item Standard
Design & Manufacturing API 602, ASME B16.34
Pressure-Temperature Rating ASME B16.34
Butt Weld End Dimensions ASME B16.25
Socket Weld End Dimensions ASME B16.11
Face-to-Face / End-to-End Manufacturer Standard (per API 602) or ASME B16.10
Inspection & Testing API 598

3. Basic Technical Parameters

Item Specification
Nominal Size (NPS/DN) 1/2″ (DN15) ~ 2″ (DN50)
Pressure Class (Class) Class 150 ~ Class 2500 (e.g., Class 800, depending on service conditions)
Seat Surface Conical / Flat (Hardfaced with Stellite or equivalent)
Stem Type OS&Y (Outside Screw and Yoke)
Applicable Media Water, Steam, Oil, Gas, etc.
Applicable Temperature -29°C ~ 425°C (Carbon Steel); -29°C ~ 550°C (Alloy Steel)

4. Main Material of Parts

Note: Specific materials depend on the medium and temperature. The table below shows a typical configuration for Carbon Steel.

Item Part Name Carbon Steel Alloy Steel Stainless Steel
1 Body ASTM A105 ASTM A182 F22 ASTM A182 F304/F316
2 Bonnet ASTM A105 ASTM A182 F22 ASTM A182 F304/F316
3 Disc A276 420 / F6a A276 304 A276 304(L)/316(L)
4 Stem A182 F6a A182 F304 A182 F304(L)/316(L)
5 Seal Ring / Gasket Flexible Graphite + 316SS (for PSB self-sealing design)
6 Packing Flexible Graphite / PTFE
7 Packing Gland A276 410 A182 F304 A182 F304(L)
8 Handwheel ASTM A197 Cast Iron / Forged Steel
9 Stem Nut Copper Alloy / A276 410

5. Main Dimensions & Connection Details

Note: The following are typical welding end dimensions (referencing API 602 and common manufacturer data for Class 800). Actual dimensions should be confirmed with the manufacturer’s final drawing.

Nominal Size Reduced Bore Full Bore End-to-End (L) Top to End (H-Open) Handwheel Dia. (W) Butt Weld O.D. Wall Thk (t)
NPS inch (mm) inch (mm) mm mm mm mm mm
1/2″ 0.41″ (10) 0.62″ (15) 79 / 92 166~171 100 21.8 3.7
3/4″ 0.56″ (14) 0.82″ (20) 92 / 111 171~207 100 27.1 3.9
1″ 0.75″ (19) 1.05″ (25) 111 / 120 207~240 125 33.8 4.5
1-1/2″ 1.25″ (32) 1.50″ (40) 152 / 172 258~330 160 48.7 5.1
2″ 1.50″ (38) 2.00″ (50) 172 / 200 330~380 180 61.1 5.6

6. Construction Features

  1. Pressure Self-Sealing Bonnet (PSB): Utilizes the medium pressure to act on the seal ring, creating a self-tightening seal. Higher pressure results in a tighter seal. It is easy to disassemble and is ideal for high-pressure applications.

  2. Welded Ends: Buttweld or Socket Weld connections eliminate potential leak paths, providing a compact structure and high strength. Suitable for severe high-temperature, high-pressure conditions where leakage is not permitted.

  3. Forged Body: The body is fully forged, resulting in dense metal structure and superior mechanical properties compared to cast valves.

  4. Anti-Blowout Stem: The stem is designed with an anti-blowout shoulder to ensure safety during packing replacement.

  5. Backseat Design: A backseat (body-seat) is provided to allow for safe packing replacement while the valve is in the fully open position.

7. Testing & Inspection

  • Shell Test: 1.5 times the rated pressure

  • High-Pressure Seat Test: 1.1 times the rated pressure

  • Backseat Test: 1.1 times the rated pressure

  • Test Standard: API 598 / ISO 5208

Remarks:

  • The PSB (Pressure Seal Bonnet) design is typically used for high-pressure classes (Class 900 and above). If you require a lower pressure rating with a Bolted Bonnet or Welded Bonnet, please specify.

  • The specific bevel preparation and dimensions for welding ends shall comply with ASME B16.25or as specified by the purchaser.

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