The advantages and disadvantages of the fluorine-lined shutoff valve and the matters needing attention

The fluorine-lined shutoff valve has the following advantages:

Simple structure, manufacturing and maintenance more convenient.

The work schedule is small and the opening and closing time is short.

Good sealing, low friction between the sealing surfaces, long life.

The disadvantages of fluorine-lined shutoff valves are as follows:

The fluid resistance is large, and the force required when opening and closing is large.

Not suitable for media with particles, high viscosity, and easy to coke.

Poor adjustment performance.

The type of high pressure stop valve is divided into external thread type and internal thread type according to the position of the stem thread. According to the flow direction of the media, there are straight-through, direct-flow, and angled. The shut-off valve is divided according to the form of the seal. There are packing seal cut-off valve and bellows sealed shut-off valve.

Installation and maintenance of the fluorine-lined globe valve should pay attention to the following matters:

Handwheels, handle-operated shut-off valves can be installed anywhere on the pipeline.

Handwheels, handles, and weigong agencies are not allowed to be lifted.

The direction of flow of the medium should be consistent with the direction of the arrow shown in the body.

Cut-off valve, also called sectional door, is the most widely used type of valve. Its popularity is due to the small friction between the sealing surfaces in the process of opening and closing. It is relatively durable, the opening height is not large, and it is easy to manufacture and maintain. Convenient, not only for medium and low pressure, but also for high pressure. Its closing principle is that relying on the pressure of the valve rod, the sealing surface of the valve flap and the sealing surface of the valve seat are closely fitted to prevent the medium from flowing.

The cut-off valve can only allow the medium to flow in one direction and has directionality when installed. Its structure length is larger than the gate valve, and the fluid resistance is large. In long-term operation, the sealing reliability is not strong.

Shutoff valves are divided into three categories: straight-through, right-angle, and direct-flow diagonal cut-off valves.