Description

TECHNICAL DATA SHEET

Close Die Forged Globe Valve

DN25, PN63, A105N Body, Stellite Seated, Bolted Bonnet, OS&Y

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1. GENERAL DESCRIPTION

This DN25 (1″) PN63 globe valve features a fully close-die forged body and bolted bonnet in ASTM A105N carbon steel. The valve is designed for high-pressure, non-corrosive services such as steam, feedwater, gas, and oil. The outside screw and yoke (OS&Y) configuration provides visual position indication and keeps the stem threads outside the fluid stream. All seating surfaces are hardfaced with Stellite Grade 6 for excellent resistance to wear, galling, and high-temperature erosion. The valve offers reliable metal-to-metal shutoff and is suitable for throttling, isolation, and frequent operation.

 

2. DESIGN FEATURES

• Close Die Forging: Body and bonnet are forged for superior structural integrity, eliminating cast defects and providing uniform grain structure.

• Bolted Bonnet: Secure body-bonnet joint with a fully confined graphite/stainless steel gasket for easy maintenance.

• OS&Y Rising Stem: External Acme threads, handwheel indication, and backseat for repacking under pressure.

• Metal Seated (Stellite Hardfaced): Integral body seat and disc face overlay of Stellite Gr.6 ensuring durability at high temperatures and pressures.

• Rotating Disc: The disc swivels on the stem tip for even wear and perfect alignment with the seat.

• Graphite Packing: Die-formed graphite rings with braided anti-extrusion ends for leak-free stem sealing across the full temperature range.

 

3. APPLICABLE STANDARDS

 

4. TECHNICAL SPECIFICATIONS

 

5. BILL OF MATERIALS (BOM)

Note: Optional NACE MR0175 compliance for sour service requires hardness restrictions on stems and internal bolting. Consult factory.

 

6. DIMENSIONS (DN25, PN63, Flanged Ends)

For butt-weld end connection, the face-to-face length is typically 254 mm and ends prepared per ASME B16.25 or EN 12627. Confirm when ordering.

 

7. PRESSURE–TEMPERATURE RATING (EN 1092-1, PN63, A105N / Group 3E0)

For temperatures above 425°C, alloy steel (A182 F11 / F22) is required. Not recommended for continuous operation below -29°C without impact-tested materials.

 

8. TESTING & INSPECTION (per EN 12266-1)

• Shell Hydrostatic Test: 94.5 bar for minimum 60 seconds. No visible leakage allowed.

• Seat Leakage Test: 69.3 bar water. Leakage rate shall not exceed EN 12266-1 Rate C limits for metal seated globe valves.

• Backseat Test: Shell test pressure with packing loose, zero leakage from gland.

• Optional: Pneumatic test (6 bar air), liquid penetrant (PT) or magnetic particle (MT) inspection on forgings, positive material identification (PMI).

 

9. COATING & PROTECTION

• Exterior: High-build two-component epoxy paint, RAL 9005 (Jet Black), min. DFT 150 μm. Other colours available.

• Stem: Polished working surface; exposed threads greased and covered with a stem protector.

• Flanges: Raised face with protective coating and end caps during transit.

 

10. ACCESSORIES & OPTIONS

• End Connection: Butt-Weld ends (BW), Socket Weld (SW), or Threaded (NPT) available on request.

• Gearbox: Not required for DN25; available for larger sizes.

• Locking Device: Padlockable handwheel in open or closed position.

• Limit Switches / Positioner: Mechanical or proximity switches for remote indication.

• Electric or Pneumatic Actuator: Mounting bracket according to ISO 5211 (flange size F05 or F07).

• Material Upgrade: Full stainless steel body (A182 F316) for corrosive fluids.

• Cryogenic Extension Bonnet: For low temperature services (down to -196°C).

 

11. NOTES

• The valve is metal seated. A small leakage is permissible per EN 12266-1 Rate C. For zero-leakage (bubble-tight) shutoff, a soft-seated valve (e.g., PTFE or PEEK) must be specified, which will be limited to lower temperatures.

• Install with flow direction as indicated by the arrow on the body—fluid must enter under the disc to ensure stable throttling and smooth operation.

• For dead-end service, the maximum differential pressure must not exceed the rated seat test pressure.

• During installation, ensure proper alignment and support to avoid induced stress on the valve body. Do not use the handwheel as a lifting point.

• Regular inspection of packing and handwheel torque is recommended for steam and high-cycle applications.

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All data is based on standard production; specifications may change without notice. Certified dimensioned drawings, EN 10204 3.1 material certificates, and test reports are available upon request.