I. Core Advantages
1. Flexible switching through multiple channels
L-shaped flow channel: Achieves two inputs and one output (such as A→B or A→C), suitable for medium distribution or switching scenarios, such as raw material switching in chemical pipelines.
T-shaped flow channel: Supports three-way flow, capable of achieving medium mixing (such as A+B→C), diversion or full on/off. Commonly used in systems requiring dynamic adjustment, such as the mixing of cold and hot water in HVAC systems.
Advantages: Replacing multiple valve combinations with a single valve, reducing the number of pipe fittings, saving space and simplifying the operation.
2. High-sealing performance
Material: Utilizes PTFE, PPL or metal hard seals, capable of withstanding high temperatures (-196°C to 450°C), high pressures (up to Class 1500), and corrosive media (such as acids and alkalis).
Design: Bidirectional sealing structure. It can withstand pressure in both forward and reverse directions, preventing the reverse flow of the medium and ensuring the safety of the system.
Case: In LNG storage and transportation, the metal hard-sealed three-way ball valve can withstand a temperature of -196℃, preventing material brittleness.
3. Convenient operation and long lifespan
Quick opening and closing: A 90° rotation is sufficient to complete the flow direction change. The response time is fast (1-5 seconds), making it suitable for frequent operation scenarios.
Drive mode: Supports various drive methods such as manual, pneumatic, and electric, facilitating the integration of automation.
Maintenance is simple: Replacing the seals is all that is needed to extend the service life. The modular design enables quick disassembly and assembly.
4. Compact Structure and Space Optimization
Integrated casting valve body: Reduces leakage points, compact design saves installation space, especially suitable for pipe galleries and densely-located equipment areas (such as ship engine rooms).
Advantage over competitors: Compared to the "two two-way valves + pipe elbows" configuration, the three-way ball valve can reduce the installation space by over 50% and lower the construction cost.
5. Strong adaptability to various working conditions
Material selection: Based on the characteristics of the medium, cast iron, stainless steel, alloy materials or fluorine-impregnated or rubber-lined structures are selected to adapt to various working conditions such as water, oil, gas, and corrosive media.
Extreme environment: Through structural optimization (such as metal hard seals, high-temperature alloy materials), it can meet extreme conditions including high temperature (≥600℃), high pressure (≥10MPa), and low temperature (≤-196℃).
II. Maintenance Points
1. Regular inspection and cleaning
Visual inspection: Check whether the valve body, flange connection area, and the electric actuator (if it is an electric valve) are damaged, leaking oil or corroded, with particular attention paid to weld seams and weak parts of the castings.
Internal cleaning: Use a mild cleaner and a soft cloth or brush to clean the interior of the valve body and the area around the ball core. Avoid using acidic or alkaline substances as they may damage the surface of the valve.
Case: In the black liquor treatment system of the papermaking industry, it is necessary to regularly remove the scale on the valve body surface to prevent corrosion from accelerating.
2. Maintenance of Sealing Performance
Sealing surface inspection: Regularly check the wear condition of the valve seat sealing surface. For minor scratches, use alumina abrasive paste (grain size W20) for polishing.
Sealing ring replacement: If you find that the sealing ring is damaged or worn out, it should be replaced immediately, and use the original factory parts that meet the requirements.
Testing method: After closing the valve, the internal leakage amount is tested using the pressure attenuation method. If the result exceeds the standard, the component needs to be disassembled for inspection.
3. Lubrication and Rust Prevention
Lubrication areas: Apply an appropriate amount of lubricant (such as molybdenum disulfide grease) to the valve stem threads, the operating rod, and the bearing components to reduce wear and prevent rust.
Anti-rust measures: When the equipment is to be idle for a long time, apply anti-rust oil or undergo acid washing and passivation treatment to enhance its resistance to chloride ion corrosion (such as in seawater desalination projects).
4. Maintenance of Electric Actuators
Electrical inspection: Use an ohmmeter to test the insulation resistance of the motor (≥ 1 MΩ), check the tightness of the connection terminals, and polish the oxidized contact points.
Lubrication and oil replacement: The gearbox should have its lubricating oil changed every 3 months. The oil level should be maintained at 1/2 to 2/3 of the sight glass.
Functional test: Simulate power failure, test the reliability of the manual operating mechanism. The torque of the handwheel rotation should be ≤ 300 N·m.
5. Monitoring of Operating Conditions
Pressure and temperature: Avoid excessive pressure and temperature to prevent damage to the valve. Take insulation measures in cold environments to prevent freezing.
Media cleanliness: Prevent solid particles and debris from entering the valve to avoid blockage and damage to the sealing surface.
Case: In the high-temperature blast furnace gas pipeline of a certain steel factory, due to a malfunction of the position sensor, the actual opening degree of the valve deviated by 30% from the displayed value, causing fluctuations in system pressure.
III. Typical Application Scenarios
1. Petrochemicals and Energy: Switching the flow direction of media in oil and gas transportation pipelines, such as crude oil distribution and LNG storage and transportation.
2. Pharmaceuticals and Food: Hygienic three-way valves (316L material, mirror-polished surface) are used in CIP/SIP cleaning systems to ensure aseptic processes.
3. HVAC (Heating, Ventilation, and Air Conditioning): Balancing the flow rate of the branch circuits in the cold and hot water systems, such as the water distribution valves for underfloor heating.
4. Water treatment: By reversing the flow direction in the reverse flushing filtration system, the filter media can be automatically cleaned.
