Open Die-Forged Gate Valve （PSB）

Description

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 and 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 .
• Body Material: ASTM A182 F11 (Chrome-Moly Alloy Steel) .
• Bonnet Design: Pressure Self-Sealing Type (Pressure Seal) .
• End Connections: ASME B16.25 (Butt-Weld Ends) .
• Face-to-Face: 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.
• The 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.

GUATANTEE:

SAVVY VALVES is committed to delivering exceptional product quality and worry-free after-sales service. Our valves are guaranteed to provide a minimum service life of 12 months, during which we will supply all necessary spare parts and detailed maintenance instructions free of charge. Within the warranty period, if any non-human-induced damage occurs, we will replace components at no cost and provide professional technical support. After the warranty expires, customers only need to pay for the cost of spare parts, while still benefiting from discounted maintenance services. Our goal is to help clients reduce operational costs and enhance production efficiency through reliable quality and comprehensive after-sales support. Whether for technical inquiries or maintenance needs, our expert team will respond promptly to ensure your valve system maintains optimal performance at all times.