0.3 second quick closing valve manufacturer explains the structure and principle of electro-hydraulic control quick closing valve

0.3 second quick closing valve manufacturer explains the structure and principle of electro-hydraulic control quick closing valve. It consists of four parts: hydraulic actuator, mechanical conversion mechanism, triple eccentric butterfly valve, and electrical control system.
1. Hydraulic actuator
The hydraulic actuator consists of an integrated hydraulic control system consisting of a power oil source, an accumulator, a control valve block, an oil cylinder, etc. The hydraulic cylinder output of the actuator is a straight stroke, and the cylinder piston is connected to the rack of the mechanical conversion mechanism through threads.
2. Mechanical conversion mechanism
The mechanical conversion mechanism consists of a rack and pinion transmission mechanism, which converts the linear stroke output of the hydraulic cylinder into angular stroke output. The mechanical conversion mechanism is connected to the valve body through a flange, and the gears inside are directly connected to the drive of the butterfly valve, driving the butterfly valve plate to perform various actions, thereby realizing the control of the butterfly valve by the actuator and completing various action functions such as quick closing.
3. Valve
Valves have good tightness, zero leakage, no jamming, long service life, and low torque. To ensure the safety and reliability of valve operation, excellent triple eccentric metal sealed butterfly valves should be selected for valves matched with electro-hydraulic control quick closing devices. There are various imported and domestic valves to choose from.
4. Electrical control system
The electrical control part consists of an operating unit, a controller, a display and alarm unit.
The operating unit has automatic, manual, remote, and local operation modes. In automatic mode, receive protection signals such as the main steam valve of the turbine closing or oil switch tripping, and quickly close the valve; Manual remote operation can be performed in the control room to quickly close valves, perform normal opening and closing, and perform valve activity tests; There is a manual on-site operation mode with the same function as manual remote operation, which is convenient for adjusting tests and emergency handling in case of accidents.
The controller receives information from the operating unit, makes logical judgments, outputs functional instructions, controls solenoid valves, and implements various functional controls. The solenoid valve operates normally without power and with power. The controller also receives system oil pressure signals, controls the start and stop of the oil pump, and maintains constant pressure operation of the oil system.
The display and alarm unit is equipped with working status displays such as valve "open", "closed", "active test", "fast closing", etc; Alarm for faults such as low oil pressure in the oil system, low oil level in the tank, low pressure in the accumulator, and overheating of the motor.
Working principle: The electro-hydraulic control quick shut-off valve consists of an electrical control device, an actuator, and a valve, and its structural principle. The control signal outputs control instructions through the controller, and the hydraulic actuator drives the valve action to achieve various control functions.