Hydraulic quick cut-off valve

液動快速切斷閥is a safety protection device that achieves rapid opening and closing through a hydraulic control system, mainly used for emergency shut-off of hazardous media in industrial pipeline systems.

The following is its core information:
working principle
Hydraulic drive mechanism: By transmitting power through hydraulic oil, the valve stem and valve plate are driven to achieve 0 ° -90 ° rotation opening and closing. During normal operation, the hydraulic system maintains the valve open, and in emergency situations, the spring returns to close the valve after pressure relief.
Double trigger mode:
Manual triggering: equipped with a hand-operated oil pump for pressure relief (such as SB03-175 oil pump);
Automatic triggering: High temperature (about 70 ℃ -80 ℃) melts the fusible alloy, and the oil cylinder automatically releases pressure.
Technical Characteristics
Response speed: Closing time ≤ 10 seconds, some models can achieve fast cut-off of<0.5 seconds;
Pressure rating: maximum 4.0MPa, oil cylinder working pressure ≤ 6.0MPa;
Applicable media: hazardous fluids such as natural gas, liquefied gas, and liquid ammonia;
Temperature range: -40 ℃ to+80 ℃, with sealing components made of polytetrafluoroethylene or nitrile rubber.
structural design
Composite valve body: integrating the lifting structure of the globe valve and the anti backflow principle of the check valve, with a medium flow direction of high inlet and low outlet;
Buffer function: Set a 5% buffer at the end of the stroke during fast closing to prevent pipeline vibration;
Detection mechanism: Reserve a 15 ° travel distance in the fully open position for easy detection of valve status.
Application scenarios
Mainly deployed in liquefied petroleum gas storage tank stations, liquid ammonia pipelines, and gas transmission systems, it is used in conjunction with remote control oil pumps to achieve rapid shut-off in case of accidents, leaks, or fires.
Installation key points
Valves should be installed according to the flow direction of the medium (high inlet and low outlet), and flange connections should comply with JB/T79.1-94 or HG20592-97 standards;
Long term storage requires sealed import and export channels and regular application of rust proof oil.