Carilovalves.com, operated by Zhejiang Carilo Valve Co., Ltd., manufactures a comprehensive range of industrial ball valves designed to meet the demanding requirements of oil and gas, petrochemical, water treatment, power generation, and marine applications. Established in 2000 with over 24 years of industry experience, the company produces ball valves in various configurations including floating ball valves and trunnion-mounted ball valves, with connection types spanning flanged ends, threaded connections, butt weld ends, and socket weld ends. The product portfolio covers standard port, full port, and reduced port designs to accommodate different flow requirements, while pressure ratings extend from Class 150 through Class 2500 (PN16 to PN420) to serve both low-pressure and high-pressure industrial systems. Operating from a state-of-the-art manufacturing facility in Wenzhou, Zhejiang Province, Carilo combines advanced engineering with rigorous quality control protocols to deliver ball valves that comply with international standards including ISO and API certifications, ensuring reliable performance across diverse operating environments worldwide.
Ball Valve Types by Structure Design
The structural design of a ball valve fundamentally determines its performance characteristics, and Carilo manufactures both floating ball and trunnion-mounted configurations to address different pressure and application scenarios. Understanding the mechanical distinction between these two designs helps procurement engineers and plant managers select the appropriate valve for their specific system requirements.
Floating Ball Valves
Floating ball valves represent the more traditional design where the ball is not mechanically anchored at the top or bottom. In this configuration, the ball floats between the seat rings and is pressed against the downstream seat by system pressure, creating a reliable seal without requiring external force. This design offers several advantages for low to medium-pressure applications including simpler construction, lower manufacturing costs, and ease of maintenance. Carilo’s floating ball valves are particularly suitable for sizes ranging from DN15 to DN200 (1/2 inch to 8 inches) and are commonly specified for general industrial service, water distribution, HVAC systems, and moderate-temperature process applications where operating pressures typically remain below Class 600. The company employs precision machining techniques to achieve tight tolerances between the ball and seat interfaces, with surface finishes typically maintained at Ra 0.2-0.4 micrometers to ensure bubble-tight sealing performance throughout the valve lifecycle.
Trunnion-Mounted Ball Valves
Trunnion-mounted ball valves incorporate bearing-supported shafts at the top and bottom of the ball, which absorb the thrust loads generated by system pressure acting on the ball surface. This mechanical arrangement significantly reduces the torque required to operate the valve, making trunnion designs the preferred choice for larger diameters and higher pressure classes. Carilo’s trunnion-mounted ball valves are engineered for sizes DN50 to DN1200 (2 inches to 48 inches) and pressure ratings up to Class 2500 (PN420), serving critical applications in oil and gas transmission pipelines, refinery process units, and high-pressure injection systems. The trunnion design also provides enhanced stability during thermal cycling, reducing the risk of seat leakage that can occur in floating designs when subjected to extreme temperature variations. According to the company’s quality documentation, each trunnion ball valve undergoes comprehensive testing including low-pressure seat leakage tests at 0.6 MPa (87 psi) and high-pressure shell tests at 1.5 times the rated pressure to verify structural integrity before shipment.
Connection Types and End Connections
The method by which a ball valve connects to the pipeline system plays a crucial role in installation, maintenance, and overall system integrity. Different connection styles offer distinct advantages regarding leak prevention, assembly speed, disassembly convenience, and suitability for specific applications. Carilo provides ball valves with multiple end connection options to accommodate the varied requirements of global industrial customers.
“Our ball valves are designed with versatile connection options to seamlessly integrate into existing infrastructure while meeting the specific pressure and temperature demands of each application. We work closely with clients to determine the most appropriate end connection based on their system design, maintenance protocols, and long-term operational considerations.”
Flanged Ball Valves
Flanged ball valves feature flat faces or raised faces with bolt holes that align with companion flanges in the piping system. This connection method provides excellent sealing through the use of gaskets placed between the flange faces, while the bolting pattern ensures secure mechanical attachment that can withstand significant internal pressure and external loading. Carilo manufactures flanged ball valves conforming to major international standards including ASME B16.5 for inch-based dimensions and EN 1092 for metric dimensions, with face-to-face dimensions according to API 608 and ISO 5752 short pattern specifications. The product range includes Class 150 through Class 600 ratings in sizes DN15 to DN600, with various flange facings including flat face (FF), raised face (RF), and ring type joint (RTJ) to match different gasket configurations and pressure classes. Flanged connections facilitate easier maintenance since valves can be removed without disturbing the adjacent pipework, making this style particularly popular in process plants where periodic inspection or repair is anticipated.
Threaded Ball Valves
Threaded end connections utilize internal threads (female threads) that engage with external threads (male threads) on the pipe or fittings, creating a pressure-tight seal through the threaded interface itself or with the addition of thread sealant compounds. Carilo offers threaded ball valves with NPT (National Pipe Thread) connections per ASME B1.20.1 for North American markets and BSP (British Standard Pipe) threads for European and Asian applications. These valves are typically specified for sizes DN8 to DN50 (1/4 inch to 2 inches) and are widely used in instrumentation panels, compressed air systems, chemical dosing lines, and general service applications where the simplicity and cost-effectiveness of threaded connections provide advantages over flanged alternatives. The company’s threaded ball valves feature hexagonal or octagonal nut configurations on the body to facilitate installation with standard wrenches, while some models incorporate integrated mounting pads for actuator attachment.
Butt Weld Ball Valves
Butt weld end connections involve welding the valve directly to the pipe ends, creating a permanent, leak-free joint with full bore continuity and minimal pressure drop. This connection style eliminates potential leak paths associated with flanges or threads, making it the preferred choice for high-pressure, high-temperature, and hazardous service applications in the oil and gas, petrochemical, and power generation industries. Carilo’s butt weld ball valves are available in sizes DN15 to DN1200 with wall thickness ratings conforming to ASME B16.25 for weld end preparation, and pressure ratings from Class 150 through Class 2500. The weld ends are typically beveled to facilitate complete penetration welds, and the company offers both schedule-compatible ends for standard pipe schedules and special thick-wall constructions for high-pressure service. Critical applications such as hydrogen pipelines, high-pressure gas transmission, and steam systems commonly specify butt weld ball valves due to their superior integrity under demanding operating conditions.
Socket Weld Ball Valves
Socket weld connections feature sockets (counterbores) that receive the pipe ends, with fillet welds applied around the pipe-to-socket interface. This arrangement provides a strong mechanical joint with better alignment control compared to butt weld connections, while still offering the leak integrity benefits of welding. Socket weld ball valves from Carilo are typically specified for sizes DN8 to DN50 and are commonly found in chemical processing, pharmaceutical, and high-purity gas systems where the smooth internal bore transition minimizes turbulence and particle accumulation. The socket weld design restricts flow to a lesser extent than threaded connections while providing higher pressure ratings than comparable threaded valves, making them a practical compromise for medium-pressure applications where periodic disassembly may be required but is not frequently anticipated.
Pressure Ratings and Temperature Ranges
The operational envelope of a ball valve in terms of pressure and temperature directly influences its suitability for specific applications, and these parameters must be carefully evaluated during the selection process to ensure safe and reliable service throughout the valve’s intended lifespan.
| Pressure Class | PN Equivalent | Typical Max Pressure (at 38°C) | Common Applications |
|---|---|---|---|
| Class 150 | PN20 | 1.96 MPa (284 psi) | Water, air, low-pressure steam |
| Class 300 | PN50 | 5.1 MPa (740 psi) | Oil, gas, general process |
| Class 600 | PN110 | 10.2 MPa (1480 psi) | Refining, petrochemical |
| Class 900 | PN150 | 15.3 MPa (2220 psi) | High-pressure gas, oil wells |
| Class 1500 | PN260 | 25.5 MPa (3700 psi) | Subsea, high-pressure injection |
| Class 2500 | PN420 | 42.4 MPa (6150 psi) | Ultra-high-pressure applications |
Carilo engineers its ball valves to operate across broad temperature ranges that vary depending on seat material selection, with standard configurations rated for service from -29°C (-20°F) to +180°C (+356°F) using PTFE seats, extended ranges from -196°C (-321°F) to +260°C (+500°F) with special seat compounds, and high-temperature designs reaching +425°C (+800°F) for steam and thermal oil applications. The selection of body materials, seat materials, stem seals, and gaskets must be coordinated to ensure all components remain functional within the intended temperature envelope, and Carilo’s technical team assists customers in specifying appropriate material combinations for their specific operating conditions including cryogenic LNG service, elevated-temperature refinery applications, and sub-zero hydrocarbon processing.
Body Materials and Corrosion Resistance
Material selection for ball valve bodies and internal components must balance mechanical strength, corrosion resistance, cost considerations, and compatibility with the process media. Carilo offers ball valves fabricated from various materials to serve diverse service conditions across different industries and geographical regions.
- Carbon Steel (WCB, LCC)
- Cost-effective for general service
- Suitable for water, air, oil, and non-corrosive hydrocarbons
- Temperature range: -29°C to +425°C
- Standard for Class 150 through Class 2500 applications
- Stainless Steel (CF8, CF8M, 316SS)
- Superior corrosion resistance for chemical service
- Excellent for acids, caustics, and chlorides
- Temperature range: -196°C to +600°C depending on grade
- Required for food, pharmaceutical, and high-purity applications
- Alloy Steel (F91, F22, Inconel)
- Enhanced strength at elevated temperatures
- Resistance to hydrogen attack and sulfide stress cracking
- Mandatory for high-temperature refinery and power applications
- Critical for sour gas and hydrogen-rich process streams
- Duplex and Super Duplex Stainless
- Superior chloride stress corrosion resistance
- Higher yield strength than conventional stainless
- Ideal for seawater and offshore applications
- PREN values exceeding 40 for enhanced performance
Seat Materials for Specific Service Conditions
The seat material determines not only the sealing performance but also the chemical compatibility and temperature limitations of the ball valve. Carilo provides various seat material options to address different service requirements, and proper seat selection is essential for achieving reliable, long-term sealing performance.
| Seat Material | Temp Range | Chemical Resistance | Typical Applications |
|---|---|---|---|
| Virgin PTFE | -196°C to +200°C | Exceptional to most chemicals except molten alkalis | General service, food, pharmaceutical |
| 25% Glass-Filled PTFE | -196°C to +230°C | Improved compressive strength and creep resistance | Higher pressure and temperature service |
| 25% Carbon-Filled PTFE | -196°C to +250°C | Enhanced thermal conductivity, good dry service | Abrasion-resistant applications |
| RPTFE (Reinforced PTFE) | -196°C to +260°C | Superior dimensional stability | Steam, thermal oil, cryogenic |
| PEEK | -40°C to +260°C | Excellent chemical and wear resistance | Hydrocarbon processing, high-pressure |
| Devlon, Nylon | -40°C to +120°C | Good for water, hydrocarbon, oils | Cost-effective general service |
| Metal-to-Metal Seats | -196°C to +650°C | Fire-safe, radiation resistant | Critical process, nuclear, fire protection |
Special Features and Configurations
Beyond standard configurations, Carilo manufactures ball valves with specialized features to address particular application requirements including fire-safe design, anti-static grounding, blowout-proof stems, oxygen cleaning, and fugitive emission control. These features expand the range of service conditions where ball valves can be reliably deployed while meeting increasingly stringent environmental and safety regulations.
Fire-Safe Ball Valves
Fire-safe ball valves are designed to maintain leak-tight sealing in the event of a fire, when软 seats may be damaged or destroyed by the flames or associated heat exposure. Carilo’s fire-safe ball valves incorporate graphite-based stem seals and body gaskets that remain intact at elevated temperatures, while metal-to-metal seating surfaces provide secondary sealing after the primary soft seats have failed. These valves are tested to API 607 or ISO 10497 standards, which involve exposing the valve to a propane torch flame while maintaining pressure and verifying no excessive leakage after cooling. Fire-safe design is mandatory for many oil and gas, petrochemical, and offshore applications where fire hazards exist and regulatory codes such as API 6D and OSHA PSM requirements apply.
Anti-Static and Grounding Devices
Static electricity accumulation in ball valves can create ignition hazards when handling flammable media or in explosive atmospheres. Carilo offers anti-static ball valves equipped with spring-loaded grounding devices that maintain electrical continuity between the ball, stem, and body throughout the valve’s operating cycle, allowing static charges to dissipate safely to ground. This feature is particularly important for valves handling hydrocarbons, powdered materials, or other substances with low electrical conductivity, and it is typically required for ATEX/IECEx classified hazardous area installations to meet Zone 0, Zone 1, and Zone 2 requirements.
Blowout-Proof Stem Construction
The stem (or shaft) of a ball valve must be retained securely within the body assembly to prevent dangerous blowout under pressure. Carilo’s ball valves incorporate blowout-proof stem designs where the stem is captured from inside the valve body cavity rather than being held by external hardware. In this configuration, the stem engages with a groove or step that prevents removal even under maximum rated pressure, protecting operators and maintenance personnel from potential injury. This safety feature is standard on most Carilo ball valves and is particularly critical for high-pressure, hazardous service, and public safety applications.
Actuator Mounting and Automation
While manually operated ball valves remain common for many applications, the trend toward plant automation, remote operation, and integration with distributed control systems has increased demand for actuated ball valves. Carilo provides factory-mounted actuators and offers actuator-ready configurations that simplify field installation while ensuring proper interface dimensions and torque compatibility.
- Pneumatic Actuators
- Quarter-turn rotary actuators for on/off service
- Double-acting and spring-return configurations
- Fail-safe options for emergency shutdown applications
- Position feedback switches and solenoid valves available
- Electric Actuators
- Multi-turn and quarter-turn designs
- Integrated controllers for modulating service
- Network communication protocols (Foundation Fieldbus, Profibus, Modbus)
- Local controls and handwheel override