Description

TECHNICAL DATA SHEET

Floating Ball Valve with Spring Return Lever (Fail Close)

Project Name: ____________________
Project No.: ____________________
Date: February 24, 2026

1. BASIC VALVE INFORMATION

2. DESIGN STANDARDS & SPECIFICATIONS

3. MAIN TECHNICAL PARAMETERS

4. MAIN COMPONENTS MATERIALS

4.1 F44 Material Properties

F44 (also known as 254SMO / UNS S31254) is a high-alloy austenitic stainless steel with excellent resistance to pitting, crevice corrosion, and stress corrosion cracking.

4.2 F44 Chemical Composition (% by weight)

4.3 F44 Mechanical Properties

4.4 Valve Components Material Selection

5. STRUCTURAL CHARACTERISTICS & TECHNICAL REQUIREMENTS

1. Valve Type: Floating ball valve design. The ball is not fixed to the stem and floats between the seats. Upstream pressure pushes the ball against the downstream seat for tight sealing.

2. Material Advantage – F44:

   • Excellent resistance to pitting and crevice corrosion in chloride environments

   • High molybdenum content (6.0-6.5%) provides superior corrosion resistance

   • Good resistance to stress corrosion cracking

   • Suitable for seawater, brackish water, and aggressive chemical services

   • Complies with ASTM A182 standard for forged components

3. Operation Mode – Manual with Spring Return (Fail Close):

   • Manual lever handle for normal operation

   • Spring return mechanism: Spring automatically returns valve to closed position when handle is released

   • Fail-safe close function ensures safety in emergency situations (power failure, operator release, emergency shutdown)

   • Handle with ergonomic grip, suitable for frequent operation

   • Clear open/close position indicator on handle

   • Spring force designed to overcome differential pressure and ensure positive sealing in closed position

4. Spring Return Mechanism Details:

   • Spring material: Stainless steel (301/302) – fully corrosion resistant

   • Spring type: Torsion spring / Compression spring (as per design)

   • Spring force: Calibrated to ensure positive closing against maximum differential pressure

   • Cycle life: Minimum 10,000 cycles

   • Fail-safe action: Upon release, valve returns to closed position within seconds

   • Manual override: Handle can be held in open position manually; releases automatically spring returns to close

5. Sealing Structure:

   • Soft seat design with PTFE/RPTFE seats for zero leakage

   • Anti-static device (spring-loaded ball between stem and ball)

   • Fire-safe design optional (meets API 607 / ISO 10497)

   • Blowout-proof stem design

6. Size Range: 1/2″ through 4″ (DN15 to DN100)

7. End Connections (specify required type):

   • Flanged: ASME B16.5 Class 150 RF (raised face)

   • Threaded: ASME B1.20.1 NPT (female threads)

   • Socket Weld: ASME B16.11

   • Butt Weld: ASME B16.25

6. DIMENSIONS & CONNECTION SIZES (Unit: mm/in)

Note: Reference dimensions for flanged end design per ASME B16.10. Final dimensions subject to manufacturer’s drawing.

7. OTHER REQUIREMENTS

1. Pressure-Temperature Rating (ASME B16.34):

   • Class 150 LB: Maximum working pressure 285 psi @ 100°F

   • Derating applies at elevated temperatures based on seat material

2. Testing:

   • Shell test: 450 psi (hydrostatic)

   • Seat test: 315 psi (hydrostatic)

   • Low pressure seat test: 80 psi (pneumatic)

   • Test duration as per API 598

   • Spring mechanism test: Verify positive closing under no-flow and differential pressure conditions

3. Coating/Finish:

   • Exterior: F44 natural finish (pickled and passivated)

   • No additional coating required for corrosion resistance

4. Identification:

   • Valve body marked with: Size, Class, Material (F44), Manufacturer’s name/logo, Heat number

   • Stainless steel nameplate fixed on body with: Model, pressure rating, max temperature, date code, “Spring Return Fail Close”

5. Spring Return Mechanism – Technical Details:

   • Spring material: Stainless Steel 301/302 (fully corrosion resistant)

   • Spring housing: Stainless Steel 304 (protects spring mechanism)

   • Spring force: Factory-set and calibrated

   • Closing time: < 2 seconds (typical)

   • Spring life: Minimum 10,000 cycles (tested)

   • Maintenance: Spring mechanism accessible for inspection without valve disassembly

   • Safety feature: Handle cannot be locked in open position (ensures fail-safe function)

6. Packing:

   • Adjustable packing gland

   • Live-loaded packing option available for reduced maintenance

7. Cleaning:

   • Valves for oxygen service require special cleaning (specify if required)

   • Standard cleaning for industrial applications

8. Warranty: 12 months after commissioning or 18 months after delivery

8. OPTIONAL FEATURES (Select if required)

9. REMARKS

• Seat Material Selection:

  • □ PTFE (Polytetrafluoroethylene): -20°C ~ +180°C, standard

  • □ RPTFE (Reinforced PTFE): -20°C ~ +200°C, improved wear resistance

  • □ PEEK: -20°C ~ +260°C, high temperature, high pressure

  • □ Metal Seated: -20°C ~ +400°C, for severe service

• End Connection Selection:

  • □ Flanged (ASME B16.5 Class 150 RF)

  • □ Threaded NPT (ASME B1.20.1)

  • □ Socket Weld (ASME B16.11)

  • □ Butt Weld (ASME B16.25)

• Spring Return Mechanism Confirmation:

  • ✓ Standard configuration: Spring return to CLOSE (Fail Close)

  • □ Alternative: Spring return to OPEN (Fail Open) – available upon request

• Special Requirements: _________________________________________________________________

• Matters not covered in this sheet shall be according to technical agreement signed by both parties and applicable standards (API 608 / ASME B16.34 / ASTM A182).

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Prepared by: ________________
Checked by: ________________
Approved by: ________________

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This technical data sheet accurately describes the Floating Ball Valve with Spring Return (Fail Close) :

• ✅ Body/Ball/Stem Material: F44 (UNS S31254 / 254SMO) – High corrosion resistance for aggressive media

• ✅ Pressure Class: Class 150 LB

• ✅ Size Range: 1/2″ ~ 4″ (DN15 ~ DN100)

• ✅ Operation: Manual Lever Handle with Spring Return – FAIL CLOSE (spring automatically closes valve when released)

• ✅ Fail-Safe Function: Ensures valve returns to closed position in emergency situations

• ✅ Compliant with ASTM A182 / ASME B16.5 / API 608 / API 598

This valve is ideal for corrosive applications requiring fail-safe close functionality, including seawater handling, chemical processing, emergency shutdown systems, and chloride-containing environments where automatic closure upon operator release is required for safety.