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FMZ Connection Valves
SF6 Gas Valve
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FMZ Connection Valves

The FMZ Connection Valves is a connecting device of SF6  densi- ty monitor to SF6 switch gear. The maintenance personnel can inspect SF6  density monitor or replace jt without disassem- bling the device from installed switchgear. It provides a solu- tion to gas density monitor inspection, replacement and gas filling, without damage to the sealing surface and seal rings of the switch caused by disassembling of valves in the process of regular checks. Therefore, it can reduce the leakage rate, im- prove the work efficiency, and ensure the safe operation of SF6 electrical switch.

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    SF6 Gas Insulated Switchgear (GIS)
    SF6 Insulated Circuit Breaker
    SF6 Insulated Pole-Mounted Switch
    SF6 Insulated Transformer
    SF6 Insulated Current Transformers or Voltage Transformers
    SF6 Insulated Bus System

    The SF6 density meters can be inspected/replaced without disassembling the SF6 meter/monitor.
    Operation can be done by one person alone without remov-ing screws, convenient, labor – saving and time-saving.
    Easy for personnel on site to make micro-water detection and gas filling.
    e Avoid the damage to sealing surface and seal rings due to disassembling .
    High-quality stainless steel with good looking appearance, never get rusted.
    With stainless steel rain cover, it can resist rain and sun, greatly improving the reliability and service life of the density relay.

    Valve Material

    Aluminium /Copper alloy/ Stainless steel

    Nominal bore

    DN6、DN8、DN12、DN20 etc

    Surface Finish

    Aluminium – anodized      Copper alloy – natural AISI304 stainless steel-natural

    Ambient conditions

    -40° C to +70° C

    Leakage rate

    Needle valve: ≤ 1×10-8 Pa·m3/s

    Ball valve：≤ 1×10-9 Pa·m3/s

    Operating pressure range

    0~1.6MPa

    Maximum withstand pressure

    6.4MPa

    Pressure connections: customizable
    Nominal diameter: customizable
    Valve type: needle valve or ball valve

    Application and Characteristics of FMZ Connection Valve for SF6 Gas Density Transmitters

    The FMZ connection valve is a specialized supporting component designed for SF6 gas density transmitters, serving as a critical connection between SF6 gas density transmitters and SF6-insulated electrical equipment air chambers. It is widely used in power systems and industrial high-voltage equipment fields, playing an irreplaceable role in ensuring the safe operation of SF6 insulation equipment, optimizing maintenance processes, and reducing leakage risks. As an essential accessory for SF6 gas monitoring systems, it effectively complements the functions of SF6 gas density transmitters and promotes the reliability of the entire monitoring system.
    The application scenarios of the FMZ connection valve are closely linked to SF6-insulated electrical equipment, covering a wide range of fields with strong pertinence. It is mainly applied to SF6 gas-insulated switchgears (GIS), SF6-insulated circuit breakers, SF6-insulated transformers, and SF6-insulated pole-mounted switches in power substations of various voltage levels. Additionally, it is suitable for SF6-insulated mutual inductors, SF6 gas-insulated busbar systems, and inflatable cabinets, which are core application scenarios in the power industry. It is widely used in new equipment installation and old equipment retrofitting, and can adapt to harsh on-site working environments with a temperature range of -40℃ to +60℃, making it applicable to high-altitude, cold, and humid areas.
    The FMZ connection valve has distinct technical characteristics and unique advantages, which are closely combined with its application needs. Firstly, it enables calibration or replacement of SF6 gas density transmitters without disassembly, solving the disassembly problem in routine maintenance and avoiding damage to switch sealing surfaces and seals caused by frequent disassembly. Secondly, it features convenient operation; a single person can complete the operation without disassembling screws, greatly saving time and labor and improving on-site maintenance efficiency. Thirdly, it facilitates on-site micro-water measurement and gas supplementation operations for SF6 equipment, simplifying the maintenance process. Finally, it has excellent sealing performance with a leakage rate of less than 1×10^-8 Pa·m³/s, and its valve seat is made of aluminum alloy, copper alloy, or stainless steel to meet different application requirements.
    In conclusion, the FMZ connection valve is an indispensable supporting component for SF6 gas density transmitters. With its practical characteristics and wide application scope, it effectively reduces SF6 gas leakage risks, optimizes maintenance efficiency, and ensures the safe and stable operation of SF6-insulated electrical equipment. It has broad application prospects in the digital and intelligent transformation of power systems.

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