DQ911F electric low temperature ball valve

1. Basic introduction of DQ911F electric low temperature ball valve and DQ941F low temperature electric ball valve:

DQ911F electric low temperature electric ball valve, DQ941F low temperature electric ball valve is a combination of electric actuator, ball valve and special extension rod, mainly used to output liquid cryogenic medium such as LNG (liquefied natural gas) LO2 (liquid oxygen) LN2 (liquid nitrogen) LAR (fuel) Liquefied petroleum products, etc. The electric low temperature ball valve can be equipped with CHR, 3810R, DZW, HQ, PSQ electric actuators with power supply voltage (220V/50HZ), (380V/50HZ), input signal 4~20mA or 1-5V-DC when matching Or output signal 4~20Ma-dc to replace manual switch adjustment operation.

DQ911F electric low-temperature electric ball valve, DQ941F low-temperature electric ball valve is divided into low-temperature floating ball valve and low-temperature fixed ball valve. For the temperature higher than -50℃, the long neck structure is generally not adopted. For the ball valve with the temperature lower than -50℃, the neck length is general It is 250mm, or determined according to design and calculation. Electric cryogenic ball valve is mainly used to output liquid cryogenic medium such as ethylene, liquid oxygen, liquid hydrogen, liquefied natural gas, liquefied petroleum products, etc. It is not only flammable and explosive, but also gasifies when it is heated, and its volume expands hundreds of times when it is gasified. . The material of the electric low temperature ball valve is very important. Unqualified materials will cause leakage or internal leakage of the shell and sealing surface; the comprehensive mechanical properties, strength and rigidity of the parts cannot meet the requirements of use or even break. The leakage of liquefied natural gas medium caused an explosion. The electric low temperature ball valve undergoes special low temperature treatment, and the rough machined parts are placed in the cooling medium for several hours (2-6 hours) to relieve stress, ensure the low temperature performance of the material, and ensure the finishing size to prevent the valve from operating at low temperatures At the time, the leakage caused by the deformation caused by the temperature change.

2. Detailed parameters of DQ911F electric low-temperature electric ball valve and DQ941F low-temperature electric ball valve:

General model: DQ941F flange DQ961F welding

Valve diameter: DN15mm～DN1200 mm (1/2～48")

Pressure rating: 1.6MPa~45MPa, 150LB~2500LB

Valve material: LCB, LC3, CF8.

Working temperature: -46℃, -101℃, -196℃, -253℃

Applicable medium: LO2, LNG, LAR, LPG

Connection form: flanged, welded, threaded.

Drive mode: electric (intelligent regulating electric actuator) (explosion-proof electric actuator)

3. Low temperature treatment of DQ911F electric low temperature ball valve and DQ941F low temperature electric ball valve:

Because the low-temperature medium is relatively special, it is not only flammable and explosive, but also vaporizes when the temperature is raised, and the volume expands hundreds of times when it is vaporized. Therefore, the electric low-temperature ball valve undergoes special low-temperature treatment, and the parts are immersed in a low temperature -196℃ during the manufacturing process. After keeping cold in liquid nitrogen for 2 to 6 hours, take it out for natural treatment, repeat the cycle 2 times, reduce temperature difference and metallographic structure change and produce deformation, improve the sealing performance of the valve at low temperature, increase the hardness of the workpiece, and make it possible to achieve The precision, electric low-temperature ball valve is used for flammable media, so it also needs anti-static design.

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