Introduction of Valve Parts and Valve Fittings

What are the parts and accessories of the valve?


Valves are mechanical devices for controlling flow and pressure in systems or processes. They are an important part of the pipeline system for transporting liquid, gas, steam, slurry and so on. Valves: gate valves, ball valves, ball valves, butterfly valves, check valves, diaphragm valves, pipe clamp valves, pressure relief valves, control valves, etc. Each of these types has many types, each of which has different functions and functions. Some valves are operated automatically, while others are operated manually or using actuators or pneumatic or hydraulic.


The functions of the valve are: stop and start the activity, reduce or increase the flow rate, control the direction of the activity, regulate the flow rate or process pressure, and release the pipeline system of certain pressure.


There are many valve plans, types and types, which are widely used in industry. All meet one or more of the above functions. Valves are expensive items. It is important to specify the correct valves for this function, and they must consist of the correct data for handling liquids.


valve body 

The valve body is the first pressure gap of the valve, which can resist the fluid pressure load of the connecting pipe. It receives inlet and outlet pipes through threads, bolts or welded joints. The end of the body is programmed to connect the valve to a pipe or equipment nozzle through different types of end joints, such as butt or socket welding, threads or flanges. The valve body is cast or forged in various forms, and each component has a specific function and is constructed from data suitable for that function.


Valve bonnet

The cover of the valve body opening is the hood of the engine, which is the second important gap of the pressure valve. Like the body, the bonnet has many plans and types to choose from. The bonnet is used as a cover on the valve body and is cast or forged with the same information as the valve body. It is usually connected to the main body through threads, bolts or welded joints. In the process of valve manufacture, the internal components (such as stem, disc, etc.) are put into the body, and then the cover is connected to hold all the components together. In all cases, the connection between hood and body is considered a pressure gap. This means that a welded joint or bolt connecting the cover to the body is a pressure-holding component. Valve cover is a necessity of most valves, but it has attracted people’s attention. Cover may complicate valve manufacture, increase valve size, represent the significant cost of the valve, and is the source of potential leakage.


Valve internals

The removable and replaceable inner parts of the valve touched by the moving medium are collectively referred to as the inner parts of the valve. These components include seat, disc, cover, gasket, guide rail, bushing and internal spring. Valve bodies, bonnets, fillers, etc. are also touched with the active medium and are not considered as internal parts of the valve. The adjusting function of the valve depends on the disk and seat interface and the relationship between the disk orientation and the seat. Because of the decoration, basic movement and flow control are possible. In the decoration planning of rotary sports, the tray slides tightly across the seat to produce the change of the movable opening. In the design of linear sports decoration, the disc rises vertically away from the seat, thus presenting an annular hole. Valve fittings can be made up of various data, because different characteristics are required to accept different forces and conditions. Bushings and packing glands are not subject to the same forces and conditions as discs and seats. The characteristics of active medium, chemical composition, pressure, temperature, flow rate, velocity and viscosity are some important considerations in selecting suitable decoration materials. Trimming data can or can not be the same as body or cover data.


Valve disc

The plate is part of the promise, throttling or suspension of activity, depending on its orientation. In the case of plugs or ball valves, the plate is called a plug or ball. Disk is the third major pressure gap. When the valve is closed, the whole system pressure is applied to the disk, so the disk is a pressure-related component. Disks are generally forged, and in some planning, hard surfaces provide excellent wear resistance. Most valves are named for their disk planning.


valve seat

Seats or sealing rings provide a seat appearance for the disc. Valves can have one or more seats. In the case of spherical or swing check valves, there is usually a seat which is sealed with the disc to prevent movement. In the case of gate valves, there are two seats; one is on the upstream side and the other is on the downstream side. Gate discs have two seat surfaces that touch the seat to form seals for blocking movement.


In order to improve the wear resistance of sealing rings, the sealing rings are usually welded and then processed to harden the surface by touching the surface. When the valve is closed, the fine appearance of the seat area is necessary for outstanding sealing. Sealing rings are generally not considered as pressure divide components, because the main body has a satisfied wall thickness to accept the planned pressure and does not depend on the thickness of the sealing ring.

Post time: Sep-16-2019

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