Shut-off valves as one of the types of shut-off valves
Steel, brass, bronze and malleable cast iron are the main materials for the manufacture of any kind of shut-off valves. These types include a variety of valves, valves, dampers and valves, each of which is used only when all the technical conditions of a particular pipe are taken into account and observed. For example, for systems for pumping aggressive substances and for waterways, radically different types of equipment are used. Let's look in more detail all kinds.
In fact, the cranes can be installed on any water supply. They are fixed by means of a coupling or flanged connection( sometimes the branch pipes of the cranes are welded to the pipeline).Cork and ball valves are distinguished, and also, coming off the working medium, they are also divided into:
- flanged ball valves, consisting of steel or cast iron. Operation of steel cranes is possible at temperatures up to seventy degrees, and cast iron up to one hundred degrees.
- cork muffs are made of cast iron and are most often used for gas pipelines. Operation is possible at a working medium temperature of not more than fifty degrees. Mounting is provided in any position.
- stuffing box cranes( cork cranes) are made of cast iron. Most often used on water and oil mains at a temperature mode of the working medium is not more than one hundred degrees. The composition includes an oil seal stuffed with foam or rubber. Mounting is possible in any position.
Shut-off valves as one of the types of valves
This is a pipe fitting, the locking body of which is a disk rotating around its axis. It is recommended to use the flaps on a pipeline with a large diameter and high pressure. As a rule, they are made of cast iron, and a rotary disk made of steel. This kind of reinforcement is cut into the pipeline by welding or flange connection.
The damper can be controlled by an electric drive, a hydraulic actuator or manually. They are used in pipes through which various acids, alkalis and corrosive drains pass. They do not require constant maintenance and, unlike cranes and valves, pass through themselves the solids contained in the working environment.
Shut-off valves as one of the types of valves
The valves are made of cast iron, ordinary or stainless steel, as well as non-ferrous metal alloys. The choice of material depends, first of all, on the contents of the pipe. Latches are used to temporarily shut off the flow and, depending on the principle of operation, they are divided into parallel and wedge.
The wedge has a wedge in the form of a wedge, the sealing surfaces of which are located at some angle. The spindle of this type of armature is not retractable. Separate the two-disk, elastic and rigid wedge.
Valves are commonly used for pipelines that carry gas, water, oil and non-corrosive substances. An important point is that the working medium must be neutral to the valve material( for example, cast iron valves are used in gas pipelines).
Popularity scored latches with an electric drive, because their control is possible both remotely and manually. The position of the locking mechanism is monitored by installed sensors and indicators.
The insertion into the pipeline is carried out by welding or flange connection.
Shut-off valve as a type of shut-off valve
With a valve, the flow of the working fluid can be completely blocked. It is not designed to adjust the pressure in the pipe, and its position should always be either in the open state or in the closed position.
The design of the valve includes a slide valve located on the descending spindle. When he sits on the saddle, the flow is blocked. Based on the type of sealing, the valves are divided into gland, bellows and diaphragm valves.
Operation is carried out by means of manual or remote control. Cast iron couplings are used for pipes in which air, water or steam are supplied, while the temperature operating mode should not be above fifty degrees. Coupling brass valves operate in systems with high pressure and are not afraid of its differences.
