The flange valve is installed on the pipelines to provide the ability to quickly shut off the fluid supply and subsequent drainage of the medium. To increase the level of security, these elements are located on all parts of the network.
Description
The flange gate valve acts as a stop valve and has a simple design, despite the high efficiency. It belongs to the category of household shut-off taps and has a special locking part in the center of the structure; its performance depends on the type of valve itself. The most widespread are disk locking, interflange wedge and ball rotary elements.
The flange valve got its name due to special flange rings located at the edges. They are used to provide quick access to the system and the ability to remove the fixture for replacement or repair work. It should be noted that the dimensions of the mating flange element must correspond to the main plate. Otherwise, the connection will not have the proper quality or even become impossible.
Advantages and disadvantages
Among the main positive aspects it is worth noting the following:
- the ability to quickly repair or replace the device with a new one;
- simple design;
- long term of operation;
- low degree of hydraulic resistance ;
- reliability.
The main disadvantage is the large mass. This leads to a high cost of elements, especially large ones, since a large amount of material is necessary for their manufacture. It is also worth noting the rapid wear of the seals.
Varieties
Cast iron flanged gate valve is available in various versions. Devices are divided into types according to the direction of action - parallel and perpendicular. The last option is stationary and advances in a perpendicular relation to the main stream. Parallel devices are installed with a zero angle and are not an obstacle to the flow, provided that they are in standard mode.
There is also a separation according to design features - these are gate, ball and wedge-shaped elements. The latter are stop valves of a standard type. They are quite effective, have a blocking of the perpendicular type, but are distinguished by their large weight.
The spherical design is similar to locking household elements of a similar type. The most widely used devices are the DN 50 due to their relatively low cost. The flange gate valve 100 has a special disk element that blocks the pipeline using a powerful spring. As a rule, it is installed on oil pipelines and gas networks.
Management Classification:
- Hand held devices. This view is controlled manually by turning a special handle or valve. Despite the need for significant physical effort, they are maintenance-free and rarely fail.
- Electric fittings. It has a built-in electric motor for control. The system is locked autonomously, after pressing a button.
Working conditions
The flange gate valve operates in various pressure ranges; the maximum level can reach hundreds of units. Operating temperature ranges from +200 to -50 degrees. Cast iron parts are characterized by advanced characteristics, in particular, work with gaseous substances can occur at +400 degrees, and the transported liquid medium can have a temperature of +270 degrees Celsius.
Clinker flanged gate valves are made mainly from materials such as cast iron and steel. This parameter is in the device label. Any products equipped with flanges should be carefully selected according to the dimensions, which are regulated by special documents. First of all, the diametral size of the conditional passage is taken into account. If there are any inconsistencies with this criterion, the connection becomes impossible. If a flanged steel product with a size of DN 80 or DN 50 is used for installation, the flange going to the adjacent pipeline must have the same parameters. At the same time, the valve is flanged, with the sliding spindle of which rotational-translational movement is made when opening, can be produced in various sizes. The maximum size can reach up to 1500 mm, the smallest fittings have a diameter of 25 mm.
Scope of application
Elements 80 and 50 have gained the greatest distribution in secondary pipelines and side branches of systems. In addition, they are used on large household systems, bends and boiler rooms. The flanged valve 100 differs in much larger dimensions and is installed on the main heating and water supply pipelines. DU 200 products are used only in industrial conditions on pressure main systems, while large special bolts are used for their installation. The cost of fittings depends on both dimensions and design features. The price of the material used in the manufacture also matters.
Installation
Installation of products is performed according to the standard scheme. At the same time, the work is simplified by welding the flanges to pipes or valves. Otherwise, the workers would have to independently connect the valves with additional parts and weld individual pipe elements. This process requires large financial and time costs, and is also characterized by some difficulties, the failure of which can lead to problems during operation. This is of particular importance in the industrial sector.
Using a sealing rubber ring element increases the tightness. It is installed in the channel located on the flange plate. On the front side of the plate there should be no scuffs and any other damage, otherwise there is a possibility of depressurization and breakthrough of the system. Under the condition of working with high pressure, this is fraught with serious consequences.