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Bolted Bonnet Gate Valve

 

A bolted bonnet gate valve is a heavy-duty isolation valve designed to shut off or restore fluid flow in high-pressure, high-temperature industrial pipelines. The valve body and bonnet are securely connected with high-strength studs and nuts, using an engineered gasket to ensure a robust body-to-bonnet seal.

 
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    Class 300 Bolted Bonnet Carbon Steel Gate Valve
    The class 300 bolted bonnet carbon steel gate valve is a heavy-duty isolation valve engineered for pressurized piping systems in oil and gas, refining, petrochemical, power generation, chemical
  • Forged Steel Bolted Bonnet Socket Weld Gate Valve
    Forged Steel Bolted Bonnet Socket Weld Gate Valve
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  • Bolted Bonnet Resilient Wedge Gate Valve
    Bolted Bonnet Resilient Wedge Gate Valve
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  • Stainless Steel Bolted Bonnet Gate Valve
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  • Class 150 Bolted Bonnet Flexible Wedge Gate Valve
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  • API 600 Bolted Bonnet Flanged Gate Valve
    API 600 Bolted Bonnet Flanged Gate Valve
    The API 600 bolted bonnet flanged gate valve is a heavy-duty steel gate valve designed for full, reliable bi-directional isolation in oil and gas, petroleum refining, petrochemical, chemical, and
 
Key Features & Benefits

Bolted Bonnet Joint:

High-strength bolting combined with a resilient body gasket ensures reliable sealing under thermal cycling and pressure fluctuations, while allowing straightforward field disassembly.


Wedge Gate Design:

Precision-machined solid or flexible wedge provides tight shut-off against seat rings. Hardfacing options (e.g., Stellite #6) offer high resistance to erosion and wear.

Rising Stem & OS&Y Construction:

The stem threads remain outside the fluid passage, protecting them from process media and line temperatures while providing visual indication of the valve position.

Full-Bore Flow Path:

Fully open operation moves the wedge clear of the flow path, minimizing pressure drop and preventing line sediment buildup.

Versatile Metallurgy & Trims:

Available in carbon steel, low-temperature carbon steel, alloy steel, and stainless steel, paired with standardized API 600 trim options.

 

Technical Specifications

 

Parameter

Specification Standard

Valve Type

Bolted Bonnet Gate Valve

Service Duty

On / Off Pipeline Isolation (Non-throttling)

Bonnet Type

Bolted Bonnet (Studs & Nuts)

Gate Type

Solid Wedge / Flexible Wedge

Stem & Yoke

OS&Y, Rising Stem

Pressure Class

ASME Class 150, 300, 600, 900, 1500, 2500

Nominal Size

2" to 48" (DN50 to DN1200)

Body/Bonnet Materials

ASTM A216 WCB, A352 LCC/LCB, A217 WC6/WC9, A351 CF8/CF8M/CF3M, Duplex Steel

Trim Materials

API 600 Trim 1, 5, 8, 10, 12, 16 (Stellite hardfacing available)

End Connections

Raised Face (RF) Flange, Ring Type Joint (RTJ) Flange, Butt-Weld (BW)

Actuation Options

Handwheel, Bevel Gearbox, Electric, Pneumatic, Hydraulic Actuator

Design Standards

API 600, ASME B16.34

Face-to-Face Dimensions

ASME B16.10

Flange Dimensions

ASME B16.5 (<=24"), ASME B16.47 Series A/B (>24")

Butt-Weld Dimensions

ASME B16.25

Testing Standards

API 598, ISO 5208

Documentation

EN 10204 3.1 MTC, NDT Reports, Pressure Test Certificates

 

Target Industry Applications
 
 
 

Oil & Gas Upstream & Midstream:

Crude oil, natural gas, and refined product pipelines.

 
 

Refining & Petrochemical:

Hydrocarbon transfer, catalytic cracking, and process isolation.

 
 

Power Generation:

Main steam lines, boiler feedwater systems, and cooling water circuits.

 
 

Chemical Processing:

Corrosive chemical handling requiring specific alloy body and trim materials.

 

 

 

Quality Assurance & Compliance

Material Traceability: 100% Heat Number tracking backed by EN 10204 3.1 Material Test Certificates.


Precision Machining: Critical dimensions and seating surface tolerances checked against approved GA drawings.


Nondestructive Testing (NDT): Radiographic (RT), Ultrasonic (UT), Liquid Penetrant (PT), and Magnetic Particle (MT) testing based on project specifications.


Pressure Testing: Shell and high/low-pressure seat tightness testing per API 598.


Certifications & Compliance: API 600 | ISO 9001 | CE / PED | SIL Capable | API 6FA / 607 Fire Safe

Forged Steel Bolted Bonnet Socket Weld Gate Valve

 

FAQ

 

Q: What is the main difference between a Bolted Bonnet and a Pressure Seal Bonnet?

A: A Bolted Bonnet uses external studs and a static gasket to maintain joint tightness, making it preferred for low-to-medium pressure classes and applications requiring regular maintenance access.

Q: Can a Bolted Bonnet Gate Valve be used for flow regulation or throttling?

A: No. Gate valves should operate fully open or fully closed. Prolonged partial opening causes high-velocity fluid turbulence across the gate, leading to severe vibration, chatter, and seating surface erosion.

Q: How do I select the proper API 600 Trim for my application?

A: Trim selection depends on the process medium, operating temperature, pressure, and corrosive nature of the fluid. Common options include Trim 8 (Universal 13Cr with hardfaced seat) for general hydrocarbon service, and Trim 5 (Full Stellite) for high-temperature or severe erosive services.

Q: Can these valves be supplied to meet NACE MR0175 / ISO 15156 for sour service?

A: Yes. For sour oil and gas service containing hydrogen sulfide (H2S), body, bonnet, trim, and bolting materials can be supplied in full compliance with NACE MR0175 / ISO 15156 hardness and metallurgy requirements.

Q: Are the face-to-face dimensions interchangeable with existing valves?

A: Yes. Valves manufactured according to ASME B16.10 comply with standard face-to-face dimensions, ensuring direct interchangeability with other ASME-compliant valves of the same size and pressure class.

We're well-known as one of the leading bolted bonnet gate valve manufacturers and suppliers in China. Please feel free to buy high quality bolted bonnet gate valve at competitive price from our factory. For more information, contact us now.

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