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  • China · Xinhui Valve Co., Ltd.

    Phone: 0577-57760066 57760077
    Fax: 0577-57760099
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    Address: Xiaojingyu Industrial Zone, Qiaoxia Town, Yongjia County, Zhejiang Province
    Extraction check valve H644H
    Extraction check valve H644H

    H644H-Exhaust Check Valve Features:
    The design and manufacturing acceptance standard adopts ANSIB16.34, E101 or JB / T3595. The strength and sealing performance fully meet the requirements of the standard. The valve under vacuum is subjected to a vacuum test, and the life of the whole machine meets user requirements;
    For different temperatures, the main material is carbon steel or high temperature steel, and the sealing surface is hardfacing with hard alloy;
    The valve disc is designed to be movably connected with the valve rod through the rocker, and can be self-aligned with the sealing surface of the valve to ensure that the sealing surface is consistent;
    The sealing surface of the valve seat is inclined at a certain angle to reduce the closing time, reduce the impact, and protect the equipment itself and the pipeline;
    The valve is equipped with a damping weight, which can balance the dynamic moment of the closing member to prevent the occurrence of non-hammer;
    The internal cavity of the valve adopts a streamlined design, which has a large flow capacity and reduces valve resistance;
    The actuator is a spring-return cylinder or hydraulic cylinder, and is relatively independent of the action of the valve closing member. Failure of the actuator does not affect the action of the closing member;
    The inner wall of the cylinder or hydraulic cylinder is coated with a wear-resistant and corrosion-resistant layer, which can increase the life, reduce the action resistance, and make the valve flexible and reliable;
    There is a limit mechanism when the closing part is opened to avoid damage caused by over-opening;
    The actuator is equipped with valve switch position signal output and local indication of valve opening position;
    It can also be designed according to the specific requirements of users.
    H644H-Extraction steam check valve design and manufacturing inspection standard:
    Design and manufacturing standards: ASME / ANSIB16.34, E101, JB / T3595
    Structure length standard: JB / T3595, ASME / ANSIB16.10, GB / T12221
    Welding end or flange standards: GB / T12224, ASME / ANSIB16.25, GB / T9113, JB / T79 ~ JB / T82
    Test acceptance standards: JB / T9092, JB / T3595, ASME / ANSIB16.34, E101

    Extraction check valve performance specifications
    The H644H valve is used in the exhaust system of power plants or thermal power plants, or other systems and non-corrosive medium pipes such as water, to prevent the pressure in the turbine from suddenly dropping when the turbine stage loads, and the steam in the extraction pipe and each heater flows back into the turbine. Causes the vicious accident of the steam turbine shattering, destroying the steam turbine generator, and prevents the heater system pipeline from leaking and tightly closing the water from the steam extraction, ensuring that when the water level of the feed water heater is too high, the components of the pneumatic device are connected to the liquid. After the backflow signal, the turbine is quickly separated to provide maximum protection to the turbine or extraction system.

    气路系统工作原理: Extraction check valve pneumatic system working principle:

    The air source comes from compressed air (air source pressure 0.4 ~ 0.6Mpa), enters the two-position three-way solenoid valve through the ball valve, and finally enters the cylinder air inlet through the fast exhaust valve, and the check valve opens. The manual directional valve is used to test the flexibility of the check valve during operation.
    When the check valve is closed, the solenoid valve is de-energized and closed, shutting off the air supply, the quick exhaust valve is activated, the air in the lower cavity of the cylinder is exhausted, and the check valve is quickly closed.
    Control components such as solenoid valves and air treatment components are imported from the United States ASCO according to the requirements of the steam turbine factory, and can also be equipped with other high-quality products from domestic and foreign manufacturers to ensure excellent performance and high reliability.

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