Emergency shut-off valve of liquefied gas storage tank

The emergency shut-off valve of LPG storage tank shall be disassembled from the liquefied gas storage tank, disassembled, inspected, maintained and adjusted, and the pressure resistance, sealing, emergency shut-off and other performance tests shall be conducted. Only after passing the inspection and re sealing can it be used. The inspection of Lpg tank emergency shut-off valve includes appearance, disassembly inspection, performance verification and remote control system test

(1) Check the type, model, operation mode, nominal pressure, manufacturer, etc. of the emergency shut-off valve of LPG storage tank to see if the appearance quality is good. The emergency shut-off valve of LPG storage tank without product manufacturing license or certificate of conformity shall not be used
(2) Clean and check the valve body of pressure vessel, without any damage, deformation, corrosion, rust, crack and other defects such as pilot rod, spring, sealing surface, cam, etc
(3) Check whether the hand pump, pipeline and fusible plug of the control system of the emergency shut-off valve device of the LPG storage tank are in good condition, whether there is damage, looseness and leakage, and whether the cable control system is flexible, reliable and in place
(4) Emergency cut off the valve of pressure vessel, check whether it is closed within 5S when it is closed; check whether it is automatically closed when it exceeds the rated flow
(5) Conduct air tightness test according to 0.1MPa and the design pressure of the tank body, and the pressure holding time shall not be less than 5rain
(6) The remote control system control test of the emergency shut-off valve of LPG storage tank shall be carried out after the air tightness test of the tank body is qualified to check whether its action is sensitive and reliable Function of emergency shut-off valve of LPG storage tank:
Safety valve to prevent large amount of liquefied petroleum gas from flowing out of LPG storage tank in case of rupture or accident of pipeline valve of pressure vessel. It is set at the outlet of gas-phase pipe and liquid-phase pipe of LPG storage tank.

Classification of emergency shut-off valve of LPG storage tank:
The emergency shut-off valve of LPG storage tank is divided into hydraulic type, pneumatic type, electric type and manual type.
1. The oil pressure type emergency shut-off valve uses the oil pump to send the pressurized oil into the oil cylinder in the valve along the oil pipe, and overcomes the spring force to push the cylinder block with valve core down, so as to open the valve. In case of an accident, the oil shall be depressurized and the valve core shall be tightly pressed on the valve seat of the pressure vessel to cut off the LPG. In order to make the emergency shut-off valve of liquefied gas storage tank close automatically in case of fire, a fusible gold plug is set on the oil circuit system. When the fire temperature rises, the fusible alloy plug melts, the oil in the oil cylinder leaks out, and the emergency shut-off valve is closed.
 2. The emergency shut-off valve of pneumatic liquefied gas storage tank uses compressed air to open and close the valve.
3. The emergency shut-off valve of the electric liquefied gas storage tank uses the suction of the electromagnet to open and close the valve.

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