China · Xinhui Valve Co., Ltd.Phone: 0577-57760066 57760077
Address: Xiaojingyu Industrial Zone, Qiaoxia Town, Yongjia County, Zhejiang Province
Valve closes hydraulically controlled check valve, H741 hydraulically controlled check valve
Connection form: flange Product material: carbon steel, stainless steel Nominal diameter: 50 ~ 1000mm
Adaptation medium: water, steam pressure environment: 0.6-10Mpa
Quick closing hydraulic control check valve, H741 extraction check valve, quick closing check valve, quick closing valve
This valve is suitable for the steam extraction pipe system and feed water reheating system of the steam turbine of the power plant in the power industry, or other industrial systems that require rapid shutdown. It is to prevent the pressure in the steam turbine from suddenly dropping when the load is suddenly dropped. The steam in the extraction pipe and each heater flows back into the steam turbine, causing the turbine blades that are rotating at high speeds of more than 3,000 revolutions per minute to suddenly run against the vehicle. Causes a vicious accident that breaks the turbine blades and destroys the turbine generator, and prevents the heater system pipeline from leaking to allow water from the steam extraction pipeline to enter the turbine and cause a water hammer accident. In the event of an accident, the valve can be quickly closed in 0.5 seconds. It is a quick-closing valve that protects the turbine generator from accidents.
【Features of Extraction Check Valve】
H741 hydraulic control check valve is a new product developed by our company after years of market research and development. A gas-hydraulic control check valve that has been shaped after several improvements. All control components are made of Festo products from Germany, with reliable quality and long service life. Its biggest feature is that it can quickly shut down and protect its main equipment within 0.5 seconds when an accident occurs. It is a special valve for a steam turbine protection unit in a thermal power plant.
The steam extraction check valve is mainly composed of a valve and a pneumatic control system. The piston rod of the hydraulic cylinder is reset by a spring, and at the same time, the valve is quickly closed. The opening of the valve mainly depends on the force of the medium and the cylinder.
【Design and manufacture inspection standard for H741 hydraulic control check valve】
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
|Product number||Pressure Level||Strength test pressure||Seal test pressure||Applicable medium temperature||Cylinder air source pressure|
|Product number||Pressure Level||Intensity, difficulty, stress||Seal test pressure||Applicable medium temperature||Cylinder air source pressure|
|H741H-20||2.0Mpa||3.0Mpa||2.2Mpa||≤425 ℃||0.6Mpa (hydraulic)|
[Major parts materials]
|Part Name||Body valve disc rocker||Valve stem||cap||Stud||Nut||Cylinder block||spring|