Description
F20 API 602 Check Valve, 1 Inch, Class 150 LB, Flanged End
ASTM A182 F20 Forged Steel Check Valve for High-Temperature and Refinery Service
The ASTM A182 F20 API 602 Check Valve, 1 Inch, Class 150 LB, Flanged End is a compact forged alloy steel non-return valve designed to automatically prevent reverse flow in high-temperature and moderate-pressure piping systems. Manufactured from ASTM A182 F20 chromium-molybdenum alloy steel, the valve provides excellent creep resistance, oxidation resistance, and mechanical strength for demanding services in power plants, refineries, petrochemical facilities, and thermal oil systems.
Designed and manufactured in accordance with API 602, ASME B16.34, ASME B16.5, and tested per API 598, this forged steel check valve offers dependable sealing performance and long service life under elevated temperatures.
Product Overview
| Item | Specification |
|---|---|
| Product Name | Forged Steel Check Valve |
| Valve Type | Swing Check Valve |
| Size | 1 Inch (DN25) |
| Pressure Rating | ASME Class 150 LB |
| Body Material | ASTM A182 F20 |
| Bonnet Material | ASTM A182 F20 |
| Disc Material | ASTM A182 F20 + 13Cr |
| Seat Material | Integral Seat / Stellite Overlay Optional |
| Connection Type | RF Flanged End |
| Design Standard | API 602 |
| Flange Standard | ASME B16.5 |
| Pressure-Temperature Rating | ASME B16.34 |
| Inspection & Testing | API 598 |
| Applicable Media | Steam, Thermal Oil, Gas, Hydrocarbons |
Key Features
ASTM A182 F20 Alloy Steel Construction
F20 alloy steel contains chromium and molybdenum, providing:
- Excellent high-temperature strength
- Superior creep resistance
- Enhanced oxidation resistance
- Good thermal fatigue properties
- Long service life in elevated-temperature applications
This material is widely used in refinery and power generation industries.
API 602 Forged Steel Design
Compared with cast valves, forged steel valves provide:
- Higher structural integrity
- Compact dimensions
- Better pressure resistance
- Reduced porosity
- Increased service life
API 602 valves are ideal for small-bore, critical process piping systems.
Automatic Reverse Flow Protection
The swing disc design automatically opens and closes according to flow direction.
Advantages include:
- No external power required
- Low pressure loss
- Fast response
- Equipment protection
- Reduced maintenance requirements
RF Flanged End Connection
Raised-face flanges provide:
- Reliable sealing
- Easy installation
- Convenient maintenance
- Compatibility with ASME B16.5 flanges
Technical Specifications
Materials of Construction
| Component | Material |
|---|---|
| Body | ASTM A182 F20 |
| Bonnet | ASTM A182 F20 |
| Disc | ASTM A182 F20 + 13Cr |
| Hinge Pin | F6a Stainless Steel |
| Seat | Integral Seat / Stellite Optional |
| Gasket | Spiral Wound SS + Graphite |
| Bolting | ASTM A193 B7 / A194 2H |
Applicable Standards
| Standard | Description |
|---|---|
| API 602 | Forged Steel Valve Design |
| ASME B16.34 | Pressure-Temperature Ratings |
| ASME B16.5 | Flanged Ends |
| API 598 | Inspection & Testing |
| MSS SP-25 | Valve Marking |
| NACE MR0175 | Optional |
Working Principle
The check valve operates automatically without manual intervention.
Forward Flow
- Fluid pressure pushes the disc open.
- Flow passes through the valve.
- Pressure drop remains minimal.
Reverse Flow
- Flow direction reverses.
- The disc immediately returns to the closed position.
- Backflow is prevented.
- Pumps and upstream equipment are protected.
Typical Applications
Oil Refineries
Suitable for:
- Hydrocarbon process lines
- Utility piping
- Heat recovery systems
- High-temperature services
Refinery Application
Power Generation Plants
Used in:
- Steam pipelines
- Boiler auxiliary systems
- Feedwater systems
- Heat transfer systems
Power Plant Application
Petrochemical Facilities
Applied in:
- Process piping
- Thermal oil systems
- Utility steam lines
- Heat exchanger circuits
Industrial Heating Systems
Ideal for:
- Thermal oil plants
- Process heaters
- Furnace systems
- Heat recovery units
Advantages of F20 Forged Steel Check Valves
| Feature | Benefit |
|---|---|
| F20 Alloy Steel | High-temperature resistance |
| API 602 Design | Compact and reliable |
| Forged Construction | High strength |
| Swing Disc Design | Low pressure drop |
| RF Flanged Ends | Easy installation |
| Automatic Operation | No external power needed |
F20 vs A105 Check Valve
| Property | ASTM A182 F20 | ASTM A105 |
|---|---|---|
| High-Temperature Strength | Excellent | Moderate |
| Oxidation Resistance | Superior | Standard |
| Creep Resistance | Excellent | Limited |
| Service Temperature | Higher | Lower |
| Cost | Higher | Lower |
For elevated-temperature applications, F20 alloy steel is generally preferred over carbon steel.
Quality Assurance
Each valve undergoes comprehensive testing:
Hydrostatic Shell Test
Verifies body pressure integrity.
Seat Leakage Test
Ensures reliable sealing performance.
PMI Material Identification
Confirms F20 alloy composition.
Dimensional Inspection
Ensures compliance with API 602 requirements.
Optional NDE
- Ultrasonic Testing (UT)
- Magnetic Particle Testing (MT)
- Dye Penetrant Testing (PT)
- Radiographic Testing (RT)
Optional Features
Seat Options
- Integral Seat
- Stellite Hardfaced Seat
Compliance Options
- NACE MR0175
- API 6D Requirements
- Fire Safe Design
- Low Emission Packing
Certification
- EN 10204 3.1
- Third-Party Inspection (SGS, BV, TUV, DNV)
Frequently Asked Questions
What is ASTM A182 F20?
F20 is a chromium-molybdenum alloy steel designed for high-temperature service with excellent creep resistance and oxidation resistance.
Why choose API 602 forged valves?
API 602 valves provide superior strength and reliability compared with cast valves, especially for small-bore, high-integrity applications.
Is Class 150 suitable for steam systems?
Yes. Class 150 valves are widely used in medium-pressure steam and thermal oil systems.
What is the advantage of a flanged connection?
RF flanges provide easier installation and maintenance compared with welded connections.
Which industries use F20 check valves?
Power plants, oil refineries, petrochemical facilities, thermal oil systems, and industrial process plants.
Request a Quote
China API 602 Forged Steel Check Valve Manufacturer
We provide:
✅ API 602 Forged Valve Manufacturing
✅ ASTM A182 F20 Alloy Steel Expertise
✅ High-Temperature Valve Solutions
✅ Third-Party Inspection Support
✅ OEM & Custom Engineering Services
✅ Worldwide Export Experience
Please provide:
- Valve Size (1 Inch)
- Pressure Rating (Class 150)
- End Connection (RF Flanged)
- Operating Temperature
- Media Type
- Quantity Required
Our engineering team will provide a detailed quotation, GA drawing, material certificates, and delivery schedule within 24 hours.
