Open Die-Forged Gate Valve （PSB）

Beschrijving

Forged Steel Gate Valve Technical Data Sheet

(Free Forging Process / Welded Connection / ASTM A182 F11 Body / Pressure Self-Sealing Bonnet)

Product Name: Forged Steel Pressure Self-Sealing Bonnet Gate Valve (Welded Ends)

1. Product Overview

This valve features a free forging process for the body, ensuring superior grain structure and mechanical properties compared to castings. It is designed with a pressure self-sealing bonnet (pressure seal design) , where the sealing performance increases with internal pressure, making it ideal for high-pressure and high-temperature applications. The body material is ASTM A182 F11 (1.25% Chrome – 0.5% Molybdenum alloy steel) , offering excellent creep resistance and high-temperature strength. Connections are butt-weld ends (BW) per ASME B16.25, providing leak-free piping systems. Designed in accordance with API 602 En ASME B16.34.

2. General Technical Specifications

3. Material of Parts Specification

4. Pressure Self-Sealing Bonnet (Pressure Seal) Characteristics

• Principle of Operation: The self-sealing bonnet utilizes a sealing gasket (typically stainless steel/graphite laminate or solid metal “pressure seal” ring) . The bonnet is secured by a threaded bonnet ring. When internal pressure is applied, it forces the bonnet upward, compressing the gasket radially against the body bore. The higher the internal pressure, the tighter the seal .
• Advantages for High Pressure:
• Eliminates large, heavy flanges and numerous stud bolts required for high-pressure ratings.
• Provides a positive, leak-proof seal that is self-energizing.
• Reduces weight and envelope size compared to bolted bonnet designs.
• Ideal for cyclic temperature and pressure services.
• Sealing Gasket: Typically flexible graphite laminated with stainless steel for high-temperature resilience and chemical resistance .

5. Main Technical Characteristics

1. Free Forged Body: The forging process refines the grain structure of the A182 F11 alloy, eliminating porosity and providing superior strength and integrity compared to castings. Essential for high-pressure applications .
2. Pressure Self-Sealing Bonnet: As described in Section 4, this design ensures leak-proof operation under extreme pressures. The bonnet is easily removable for maintenance .
3. Welded Connection (BW Ends): Butt-weld ends per ASME B16.25 provide a permanent, leak-free connection to the piping system, eliminating flange gasket maintenance and potential leak paths .
4. A182 F11 Alloy Steel Construction: 1.25% Chrome – 0.5% Molybdenum steel offers excellent resistance to high-temperature creep, oxidation, and corrosion in steam, oil, and gas services up to 550°C .
5. Hard-Faced Seats (Stellite): The wedge and seat sealing surfaces are overlaid with Stellite (Cobalt-based alloy) , ensuring long life in erosive high-velocity services .
6. Rising Stem & OS&Y: Clear visual indication of valve position. Outside screw design prevents thread contact with the line media .
7. Backseat Design: Allows for repacking under pressure when the valve is fully open .
8. API 602 Compliance: Designed to the rigorous requirements of API 602 for forged steel valves, ensuring robust construction and reliable performance .

6. Principal Dimensions & Connection Data (Reference Class 1500 BW)

*Note: Final dimensions subject to approval drawings. Conforms to API 602 / ASME B16.10.*

Note: For Class 2500, dimensions vary. Please consult factory for specific drawings .

7. Applicable Standards & Testing

• Design & Manufacture: API 602 (Steel Gate Valves) / ASME B16.34 / ISO 15761 .
• Lichaamsmateriaal: ASTM A182 F11 (Chrome-Moly Alloy Steel) .
• Bonnet Design: Pressure Self-Sealing Type (Pressure Seal) .
• End Connections: ASME B16.25 (Butt-Weld Ends) .
• Persoonlijk: ASME B16.10 / API 602 .
• Pressure Tests:
• Shell Test: 1.5 x Rated Pressure at ambient temperature
• High-Pressure Seat Test: 1.1 x Rated Pressure at ambient temperature
• Low-Pressure Pneumatic Test: 0.6 MPa (90 psi)
• Inspection Standard: API 598 / API 6D .

8. Remarks

• This valve is specifically designed for High-Pressure Steam, Power Generation, and Critical Hydrocarbon Services.
• De Pressure Self-Sealing Bonnet combined with A182 F11 Forged Body makes this valve ideal for superheated steam applications up to 550°C .
• Stellite hardfacing on seat and disc ensures long-term reliability in erosive conditions .
• Butt-weld ends eliminate potential flange leakage and reduce maintenance.
• Optional NACE MR0175 / ISO 15156 compliance for sour gas service available upon request.

GARANTIE:

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