Globe Valves Open Die Forged—1/2″ 4500LB BW

Description

Globe Valves Open Die Forged — 1/2″ 4500LB BW

TECHNICAL DATA SHEET

1. General Description

This is a 1/2-inch, Class 4500, open die forged body, bolted bonnet, butt-weld end globe valve. The body is manufactured using the open die forging process. The disc and seat seating faces are hardfaced with Stellite alloy, making it suitable for ultra-high pressure and high temperature isolation and regulation services. The non-rotating, anti-blowout stem design ensures operational safety and long packing life. Compact in structure, it is widely used for high-temperature, high-pressure drain, vent, instrument isolation, and bypass systems in ultra-supercritical thermal power plants.

2. Applicable Standards & Codes

Item Standard / Code
Design & Manufacture ASME B16.34
Pressure-Temperature Ratings ASME B16.34
Face-to-Face ASME B16.10
Butt-Weld Ends ASME B16.25
Inspection & Testing API 598
Materials ASTM A105 (Open Die Forged), ASME BPVC Sec. II
3. Main Technical Parameters

Parameter Description
Nominal Size 1/2 inch (DN 15)
Pressure Class Class 4500
Body Material ASTM A105 (standard; F22/F91/SS optional)
End Connection Butt-Weld (BW) per ASME B16.25
Bonnet Type Bolted Bonnet
Disc Type Cone or parabolic, Stellite Gr.6 hardfaced
Seat Type Renewable, Stellite Gr.6 hardfaced
Operation Handwheel manual (standard)
Flow Direction Per arrow mark, low in & high out
Service Media Water, steam, oil, etc.
Operating Temp. Range -29 °C to 425 °C (A105 body; select F22/F91 for higher)
Hydrostatic Test Pressure (ambient) Shell: 77.6 MPa.g (11250 psi); Seat: 56.9 MPa.g (8250 psi)
Leakage Class API 598 Zero Leakage
4. Typical Bill of Materials

No. Part Name Material Remarks
1 Body ASTM A105 Open Die Forged, Normalized
2 Bonnet ASTM A105 Open Die Forged
3 Disc ASTM A182 F6a Seating face Stellite Gr.6 overlay
4 Seat Ring ASTM A182 F6a Renewable, seating face Stellite Gr.6
5 Stem ASTM A276 410 / A182 F6a Non-rotating, anti-blowout shoulder, precision ground
6 Packing Flexible Graphite V-ring set, die-formed
7 Gasket Stainless Steel + Graphite Spiral Wound Body-to-bonnet seal
8 Gland ASTM A276 410 Spherically faced, self-aligning
9 Stem Nut Copper Alloy (ASTM B148 C95400) With grease fitting
10 Handwheel Carbon Steel / Malleable Iron Impactor or bar type
11 Fasteners ASTM A193 B16 / A194 Gr.4 High-temperature alloy bolting
5. Approximate Dimensions & Weight

Based on standard design. Final certified drawing governs.

Specification Unit Value
Nominal Size inch (mm) 1/2 (DN 15)
Face-to-Face, BW (L) mm 216
Center to Top Height (H) mm Approx. 260
Handwheel Diameter mm Approx. 180
Stem Diameter mm Approx. 14
BW End Pipe Match – Per customer, typically SCH XXS
Approx. Total Weight kg Approx. 16
Note: Height and weight are approximate for manual operation. Values will increase with gearbox or actuator.

6. Design & Manufacturing Features

Open Die Forged Body: Complete grain flow and dense microstructure without casting defects provide exceptional ultra-high-pressure capability and excellent fatigue and creep resistance.
High-Pressure Sealing: Both disc and seat seating faces are hardfaced with Stellite alloy for high hardness, wear resistance, and erosion resistance, ensuring zero leakage and extended service life.
Non-Rotating, Anti-Blowout Stem: The stem only moves up and down without rotation, protecting the packing from wear. An integral anti-blowout shoulder ensures safety under high pressure, meeting ASME B16.34 requirements.
Renewable Seat Ring: The seat ring is threaded into the body and can be quickly replaced in the field if the seating surface is worn, significantly reducing maintenance costs.
Low-Maintenance Packing: Flexible graphite V-ring packing offers high-temperature resistance and self-lubrication. A spherically faced, self-aligning gland maintains uniform compression for long-term sealing.
Compact Design: Short face-to-face dimension is ideal for installation in high-pressure lines with space limitations.
7. Pressure-Temperature Ratings Reference

(ASME B16.34, A105 Material, Class 4500)

Service Temperature (°C) Max. Allowable Working Pressure (MPa.g)
-29 ~ 38 51.7
100 50.1
200 47.5
300 44.8
400 41.4
425 40.7
*Note: Values for reference only. Exact ratings per ASME B16.34 latest edition. For service temperatures exceeding 425 °C, select F22 or F91 Cr-Mo steel body material.*

8. Inspection, Testing & Documentation

100% hydrostatically tested per API 598, including shell strength and high-pressure seat tests.
Chemical composition and mechanical property reports provided for body and bonnet forgings.
Optional NDE: Ultrasonic Examination (UT), Magnetic Particle Examination (MT), Liquid Penetrant Examination (PT).
Standard Documentation: Material certificates, hydrostatic test reports, certificate of conformance, and installation & maintenance manual. EN 10204 3.1 or 3.2 certificates available upon request.
Valves are cleaned, degreased, and end-protected for shipment.
9. Typical Applications

Main steam system drain and vent in ultra-supercritical thermal power plants
High-pressure feedwater heater bypass and air release
Instrument isolation and pressure gauge root valves
Steam and high-pressure oil isolation and throttling
High-pressure clean fluid control in petrochemical and chemical plants
10. Additional Selection Notes

Body Material: Standard carbon steel A105, max. service temperature 425 °C. For higher temperatures or corrosive media, specify F22 (1.25Cr-0.5Mo), F91 (9Cr-1Mo-V), or stainless steel.
Butt-Weld End Preparation: Per ASME B16.25, default matching pipe wall thickness is SCH XXS. Please confirm pipe schedule when ordering.
Operation: Handwheel manual is standard. If electric or pneumatic actuation is required, please provide relevant parameters.