Dalian marine valve is a device used to control the direction, pressure and flow of the fluid in the fluid system. It is a device that allows the medium (liquid, gas, powder) in piping and equipment to flow or stop and can control its flow.

Marine valve is a control component in pipeline fluid transportation system, which is used to change the channel section and medium flow direction. It has the functions of diversion, cut-off, throttling, check, diversion or overflow pressure relief.

The valves used for fluid control range from simple stop valves to various valves used in extremely complex automatic control systems, with a wide range of varieties and specifications. The nominal diameter of the valves ranges from very small instrument valves to industrial pipeline valves with a diameter of 10m.

Mainly divided by caliber:

Different valves are different in size, the diameter of the stop valve is not large, and the gate valve is generally within DN2000.

The larger ball valve is also within DN1500, and what can be done in China is generally within DN1200.

According to the nominal diameter of the valve, it can be divided into:

Small diameter valve: valve with nominal diameter DN<40mm.

Medium diameter valve: valve with nominal diameter of DN50~300mm.

Large diameter valve: valve with nominal diameter of DN350~1200mm.

Extra large diameter valve: valve with nominal diameter DN ≥ 1400mm

For example: hydropower industry: butterfly valve (ball valve)

Small diameter valve: valve with nominal diameter DN<2000mm (1000).

Medium diameter valve: valve with nominal diameter of DN2000~3500mm (1000-1800).

Large diameter valve: valve with nominal diameter of DN3500~5000mm (1800-2500).

Extra large diameter valve: valve with nominal diameter DN ≥ 5000mm (2500)