Introduction of valve parts and valve accessories

Issuing time:2019-12-05 09:03

A valve is a mechanical device that controls the flow and pressure in a system or process. They are an important part of the pipeline system that transports liquids, gases, vapors, slurries, etc. Valve: Gate valve, ball valve, ball valve, butterfly valve, check valve, diaphragm valve, pinch valve, pressure reducing valve, control valve, etc. Each of these types has many types, and each type has different functions and functions. Some valves are operated automatically, while others are operated manually or using an actuator or pneumatic or hydraulic.


The functions of the valve are: a pipeline system that stops and starts activities, reduces or increases flow, controls the direction of activities, regulates flow or process pressure, and releases a certain pressure.


There are many valve plans, types and types with a wide range of industrial uses. All meet one or more of the above functions. Valves are expensive items. It is important to specify the correct valve for this function, and it must be made up of the correct information for handling liquids.



Valve body


The valve body is the valve's first pressure gap and resists the fluid pressure load of the connecting pipe. It accepts inlet and outlet pipes through threads, bolts or welded joints. The end of the valve body is planned to connect the valve to a pipe or equipment nozzle through different types of end connections, 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 materials suitable for that function.



Valve bonnet


The cover of the valve body opening is the hood, which is the second most important gap in the pressure valve. Like the valve body, there are many plans and types to choose from. The valve cover is used as a cover on the valve body, and is cast or forged from the same material as the valve body. It is usually connected to the body through threads, bolts or welded joints. In the process of making a valve, place internal components (such as stem, disc, etc.) into the valve body, and then engage the bonnet to hold all the components together. In all cases, the interface between the hood and the body is considered a pressure gap. This means that the welded joint or bolt that connects the bonnet to the valve body is a pressure-holding component. Although valve bonnets are a necessity for most valves, they have attracted attention. The bonnet may complicate the manufacture of the valve, increase the size of the valve, represent a significant part of the cost of the valve, and is a potential source of leakage.



Valve trim


Removable and replaceable valve internal parts that come into contact with the moving medium are collectively referred to as trim. These components include valve seats, discs, glands, gaskets, rails, bushings and internal tension springs. The valve body, bonnet, packing, etc. are also in contact with the moving medium and are not considered to be valve trim. The adjustment function of the valve depends on the interface between the disk and the seat, and the relationship between the orientation of the disk and the seat. Thanks to the decoration, fundamental movement and flow control are possible. In the revolving motion decoration plan, the disc slides tightly over the seat to create a change in the movable opening. In the linear motion fit-out design, the disc is raised vertically away from the seat, thus presenting an annular hole. Valve decoration components can be composed of various materials, 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 valve discs and seats. The characteristics of the active medium, chemical composition, pressure, temperature, flow rate, speed, and viscosity are some of the important considerations in choosing the right fitment information. The trimming data may or may not be the same data as the valve body or bonnet.



Valve plate


The plate is the part that promises, throttles or suspends activity, depending on its orientation. In the case of a plug or ball valve, the disc is called a plug or ball. Disks are the third most important main pressure gap. With the valve closed, the entire system pressure is applied to the disk, so the disk is a pressure-dependent component. The discs are generally forged, and in some plans a hard look to provide outstanding abrasion resistance. Most valves are named for their disk plans.



Valve seat


A valve seat or sealing ring provides the seat appearance to the disc. The valve can have one or more seats. In the case of ball or swing check valves, there is generally a seat that is sealed from the disc to prevent movement. In the case of a gate valve, there are two seats; one on the upstream side and one on the downstream side. The gate valve disc has two valve seat appearances that touch the valve seat to form a seal for blocking movement.


In order to improve the abrasion resistance of the seal ring, the appearance of the seal ring is generally hardened by welding and then processing the touch surface of the seal ring. When the valve is closed, the fine appearance of the seat area is necessary for outstanding sealing. The seal ring is generally not considered as a pressure gap component, because the body has a sufficient wall thickness to accept the planned pressure and does not depend on the thickness of the seal ring



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公司地址:天津市河西区美年广场4-801                                            联系邮箱:frank.pan@kxc-metal.com                                                                   联系电话:18622652376