The BCV 700 is an automatic bottom blowdown control valve designed for steam boilers, manufactured by ATECH. Its primary function is to regulate the blowdown process in a boiler, which involves periodically draining a portion of the boiler water to remove accumulated solids and maintain water quality. This process is crucial for efficient boiler operation and longevity.
Function Description
The BCV 700 system comprises a Smart Bottom Blowdown Controller BC 700 and the bottom blowdown control valve itself. The controller monitors the boiler's operating conditions and initiates the blowdown sequence as needed. The valve is designed to open rapidly to create a suction effect, ensuring that deposits and solids are effectively flushed out of the boiler. The duration and frequency of the blowdown are controlled by the BC 700 controller, which can be programmed to optimize the process based on specific boiler requirements. This automated control helps prevent excessive heat loss and water wastage that can occur with manual blowdown methods, while ensuring that the boiler water quality remains within acceptable limits. The system is designed to operate in response to a signal from the Smart Bottom Blowdown Controller, opening for a predetermined frequency and duration. The rapid opening of the bottom blowdown valve is essential for creating the necessary suction to effectively remove deposits.
Important Technical Specifications
The BCV 700 valve has several key operating parameters:
- Max. Operating Temperature: 239°C
- Max. Operating Pressure: 32 bar g
- Nominal Pressure (PN): 40
- Valve Body Material: Stainless Steel
- Connection Type: Flanged
- Operating Principle: Spring return actuator
- Weight: 10.5 kg (for DN 40)
The system also includes an LS 700 Limit Switch and a YV 732 Namur Solenoid Valve, each with its own specifications:
LS 700 Limit Switch:
- Type: Mechanical Switch, open/close position indicator
- Enclosure: IP 65
- Max. Ambient Temperature: 80 °C
- Weight: 0.15 kg
YV 732 Namur Solenoid Valve:
- Type: 1/4" - 5/2
- Supply Voltage: 24 V, 220 V
- Max. Ambient Temperature: 80°C
- Operation Pressure: 6-8 bar
- Weight: 0.15 kg
The compressed air supply for the solenoid valve must be between 5 bar g and 8 bar g, with a minimum diameter pipe of 8 mm.
Usage Features
The BCV 700 is designed for ease of installation and operation. The installation process involves connecting the valve to the boiler and wiring the Smart Bottom Blowdown Controller, limit switch, and Namur solenoid valve.
- Wiring: The wiring between the Smart Bottom Blowdown Controller BC 700 and the Namur solenoid valve requires a 3x1 mm² cable. For the connection between the controller and the limit switch, a 2x1 mm² normal cable is used.
- Compressed Air Supply: The compressed air supply connects to port 1 (1/4" BSP) on the solenoid valve. The air supply pipe must have a minimum diameter of 8 mm, and the pressure should be maintained between 5 bar g and 8 bar g.
- Commissioning: During commissioning, it is crucial to ensure that all phase and neutral ends are correctly connected to the right terminals. The compressed air supply must be connected to the right port on the Namur/Solenoid Valve. Before operation, the valve should be tested to ensure it opens and closes correctly. This can be verified by referring to the "Smart BC 700 Bottom Blowdown Controller Installation and Operating Instructions."
Maintenance Features
Maintenance of the BCV 700 system is critical for its reliable operation and longevity.
- General Maintenance: Regular maintenance involves ensuring that the main supply is detached before any work on the device. This is a crucial safety measure to prevent personal injuries or even death.
- Disassembly and Reassembly: Before any blowdown valve assembly, disassembly, or maintenance, it is essential to ensure that any pressure is isolated and safely vented to atmospheric pressure (0 bar g). If steam or hot water leakage occurs, the valve must be stopped, and the cause investigated.
- Temperature Precautions: The valve surfaces can become hot during operation. Personnel should be aware of this and take necessary precautions to avoid burns. All equipment temperatures should be checked to ensure they are within safe levels.
- Damage Claims: Any claims for damage caused by improper installation or maintenance will be rejected by the manufacturer.
- Troubleshooting: In case of any fault situation or necessary maintenance, contact "Atech Service Department" for assistance.
- Function Tests: It is recommended to perform function tests regularly to ensure the system operates as expected.
The BCV 700 is a robust and essential component for managing boiler blowdown, contributing to the efficiency and safety of steam generation systems.
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