Open Die-Forged Gate Valve （PSB）
Open Die-Forged Gate Valve （PSB） - Image 2
Open Die-Forged Gate Valve （PSB） - Image 3
Open Die-Forged Gate Valve （PSB） - Image 4

Open Die-Forged Gate Valve （PSB）

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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)
Model: Z61Y-1500Lb / Z61Y-2500Lb (Self-Sealing Type)
Date: February 16, 2026

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

Item Specification
Valve Type Bolted Bonnet, Outside Screw and Yoke (OS&Y), Rising Stem Gate Valve
Manufacturing Process Free Forging (Hot forged, solution annealed and grain refined)
Bonnet Design Pressure Self-Sealing (Pressure Seal) – Threaded bonnet ring with sealing gasket
Nominal Size (NPS) 1/2″ ~ 2″ (DN15 ~ DN50)
Pressure Class Class 1500 / Class 2500 / Class 4500 (Custom)
Connection Type Butt-Weld Ends (BW) conforming to ASME B16.25
Temperature Range -29°C ~ +550°C (-20°F ~ +1022°F)
Applicable Media High-pressure steam, Hot water, Oil & Gas, Power generation applications
Design Standard API 602 / ASME B16.34 / ISO 15761
Face-to-Face Dimension ASME B16.10 / API 602
Pressure Testing API 598

3. Material of Parts Specification

Part Name Material / Grade Material Properties & Application
Body ASTM A182 F11 (Class 2) 1.25%Cr-0.5%Mo alloy steel. High tensile strength, excellent corrosion resistance and creep resistance at elevated temperatures. Suitable for high-pressure steam services .
Bonnet ASTM A182 F11 Same material as body, ensures consistent thermal expansion and strength .
Disc (Gate) ASTM A182 F6a (13% Cr) + Stellite Hardfacing / A182 F11 13% Chrome stainless steel with Stellite 6 hardfacing on sealing surfaces for erosion and wear resistance .
Seat Ring Integral with Body or Welded + Stellite Hardfacing Hardfaced with Stellite alloy, ground to mirror finish for metal-to-metal tight shut-off .
Stem ASTM A182 F6a (13% Cr Stainless Steel) / A182 F304 High strength, corrosion resistant, blow-out proof design. Surface treated (nitriding/chrome plating) to reduce friction .
Self-Sealing Gasket Stainless Steel + Flexible Graphite laminated / Pressure Seal Ring “Delta” or “Wedge” type ring. Pressure energizes the seal – higher pressure, tighter seal .
Bonnet Ring ASTM A182 F11 / Carbon Steel Threaded ring that compresses the self-seal gasket.
Packing Flexible Graphite (Die-formed rings) High temperature resistance, low fugitive emission compliance (ISO 15848-1) .
Gland Follower ASTM A182 F11 / Stainless Steel Precise compression of packing rings.
Stem Nut Aluminum Bronze (C95400) / Ni-Resist Self-lubricating, prevents stem galling .
Handwheel Ductile Iron / Fabricated Steel Impact-resistant design.

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.*

NPS Size (inch) Face-to-Face L (mm) Body Bore (mm) BW End OD (mm) Approx. Height H (Open) (mm) Approx. Weight (kg)
1/2″ 0.5 79 12.7 21.8 ~158 ~2.1
3/4″ 0.75 92 19.1 27.2 ~169 ~2.3
1″ 1.0 111 24.0 34.0 ~197 ~4.3
1-1/4″ 1.25 120 31.8 42.8 ~236 ~5.9
1-1/2″ 1.5 140 38.1 48.8 ~283 ~11.1
2″ 2.0 178 50.8 61.4 ~330 ~15.2

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.

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