Low Temperature Extended Bonnet Gate Valve
Hanno Valve manufactures Low Temperature Extended Bonnet Gate Valve in China for low temperature and sub zero industrial pipeline service. The supplied engineering drawing identifies this model as a 28" Class 150 CF8 RF gate valve, with ASTM A351 CF8 body, ASTM A351 CF8+STL wedge, ASTM A182 F304 stem and an extended bonnet structure. The documented operating temperature range is -101°C to 300°C, with a shell test pressure of 30 bar and sealing test pressure of 22 bar.
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Product Description
As a China manufacturer and supplier, Hanno Valve provides extended bonnet gate valves for industrial pipeline applications where low-temperature conditions need to be considered during valve selection. The extended bonnet increases the distance between the cold valve body and the stem packing area, helping keep the upper sealing and operating components farther from the low-temperature section.
For this specific 28" Class 150 configuration, the supplied engineering drawing specifies 30 bar shell test pressure and 22 bar sealing test pressure. The valve uses an RF flanged connection and is designed according to the standards stated in the technical documentation.
Extended Bonnet Design
The extended bonnet is the key structural feature of this valve. Compared with a conventional bonnet arrangement, it places the stem packing area farther from the low-temperature valve body.
- Separates the packing area from the cold valve body
- Reduces direct exposure of the upper sealing area to low temperatures
- Provides a suitable operating arrangement for sub-zero service
- Keeps the operating components farther from the cold section
The actual temperature rating should always be checked against the documented configuration before selection.
Key Features
Extended Bonnet Structure
The extended bonnet provides additional separation between the valve body and stem packing area for low-temperature service.
CF8 Stainless Steel Construction
The valve body is made from ASTM A351 CF8, with an ASTM A351 CF8 + STL wedge and ASTM A182 F304 stem according to the supplied material list.
Class 150 RF Flanged Connection
The documented valve is a 28" Class 150 / 150LB configuration with an RF flanged connection.
Documented Low-Temperature Rating
The supplied engineering drawing specifies an operating temperature range of -101°C to 300°C.
Gearbox Operation
The engineering drawing identifies a gearbox assembly at the upper part of the valve for operation.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Name | Low Temperature Extended Bonnet Gate Valve |
| Nominal Size | 28" |
| Pressure Class | Class 150 / 150LB |
| Body Material | ASTM A351 CF8 |
| Wedge Material | ASTM A351 CF8 + STL |
| Stem Material | ASTM A182 F304 |
| Connection | RF Flanged |
| Design Standard | API 600 |
| Face-to-Face | ASME B16.10 |
| Flange Standard | ASME B16.47-2020 Type B |
| Low-Temperature Design | GB/T 24925 |
| Inspection & Testing | API 598 |
| Shell Test Pressure | 30 bar |
| Sealing Test Pressure | 22 bar |
| Operating Temperature | -101°C to 300°C |
| Operation | Gearbox |
Materials and Construction
| Component | Material |
|---|---|
| Body | ASTM A351 CF8 |
| Wedge | ASTM A351 CF8 + STL |
| Stem | ASTM A182 F304 |
| Bonnet | ASTM A351 CF8 |
| Packing Sleeve | ASTM A182 F304 |
| Packing | SS304 + Braided Graphite + Flexible Graphite |
| Support Seat | SS316L |
| Drip Tray | SS304 |
| Butterfly Gasket | Inconel X750 |
This material information applies to the specific configuration shown in the supplied engineering drawing.
Applications
The valve can be considered for industrial pipeline systems handling:
- Oil
- Natural gas
- Chemical media
- Steam
- Other mildly corrosive media
- Low-temperature industrial fluids
Valve selection should be based on the actual medium, pressure, temperature, material requirements, and pipeline conditions.
Installation Requirement
The supplied engineering drawing specifies that the valve is suitable for vertical or horizontal installation and is not suitable for inverted installation.
The installation orientation should therefore be confirmed during pipeline design and before installation.
Why Choose Hanno Valve?
Hanno Valve is supported by Zhejiang Hengnuo Valve Manufacturing Co., Ltd., a valve manufacturer located in Lishui, Zhejiang, China.
- 25+ years of valve manufacturing experience
- Approximately 18,000 m² production area
- Around 150 employees
- More than 32 senior technicians
- More than 40 production and processing equipment
- In-house foundry
- Precoated sand casting technology
The manufacturer's product range includes gate valves, check valves, globe valves, and power station valves.
Reported company-level certifications and qualifications include ISO 9001, ISO 14001, API 600, CE, Russia TC 010/032, and China Special Equipment Manufacturing License. The applicable certificates and inspection documents should be confirmed according to the actual order.
FAQ
What is the operating temperature of this 28" valve?
The supplied engineering drawing specifies an operating temperature range of -101°C to 300°C.
Can this valve be used at -196°C?
Not according to the supplied documentation. The minimum operating temperature for this specific 28" Class 150 CF8 RF configuration is -101°C. A -196°C application requires separate technical confirmation.
What is the body material?
The valve body is made of ASTM A351 CF8 according to the supplied material list.
What pressure class is this valve?
This configuration is a 28" Class 150 / 150LB gate valve.
What are the pressure test values?
The documented shell test pressure is 30 bar, and the sealing test pressure is 22 bar.
Can the valve be installed upside down?
No. The supplied engineering drawing specifies vertical or horizontal installation only and does not permit inverted installation.
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