The type of valve characteristics and selection of these brief

1. Preface



Valve used for piping systems, liquid handling of the control device, select the valve of the first step is to understand the function of a variety of valves and we hope the valves, installed after the completion of the tasks entrusted to him, we and efficiency.



2. Valve classification



(1) Valve according to their functions, as follows:



A. Switching Valves: valve, plug valve, ball valve.



B. throttle categories: ball valve, needle valve, angle, disc-type valves, valve.



C. Check categories: swing, lift and dual-plate check valve, bottom valve.



D. Pressure Control Valves: relief valve, relief valve, safety valve.



E. Special Valves:



A. sampling valve



B. flow control valve



C. relief valve



D. other style valve



(2) classification according to material



A. Non-Metallic Valves: PVC, plastic (steel), such as Teflon.



B. Metal Valves



a. ferrous metals: iron, steel, stainless steel, alloy steel and so on.



B. Non-metal: aluminum, copper and so on.



(3)-way classification



A. Casting Valves: sand mold, shell mold, mold dewaxing, die-casting method, such as model, production of the metal valve.



B. Valves Forging: Forging or freedom from forging or pills (side) then the value of wood processing, metal valves production.



C. welding manufacturing valves categories: body, covered in part by the combination of a number of manufacturers by welding, such valves must pay attention to and identification of welding procedure specification (WPS and PQR).



D. Injection Valves: General used in PVC, plastic valve to be non-metallic type of manufacturing.



3. The characteristics of various types of valves



(1) Gate (GATE VALVES)



Valve in a pipeline to parts of the system needs a "full, full-off" control and fluid flow only to have a little of the pressure drop design used from time to time. When a system needs to be a part of the isolation, without having to consider cutting fluid (THROTTING) of the control valve is a very ideal and appropriate. When the savings due to use, have experience of the flow through the portal of high-speed, and the erosion caused by fluid on the door, Block and Shell (drawing generated phenomenon), or injury caused by vibration.



(2) the ball-valve (GLOBE VALVES), angle (ANGLE VALVES), needle (NEEDLE VALVE) ball because the ball-valve ball called columnar shape and are mainly to be closed for regular switches and when the fluid control the flow of expenditure should be the role of design, its most notable feature is effective to reduce expenses, so that drawing is reduced to at least be reduced as a result of the Baptist valves and valve seat (red) to lose money, but the seat is parallel to the flow line, valve seat when fluid flows through such changes, will have a spoiler in the valve, as well as the lower edge of the drop is not only suitable for the Netherlands because of the pressure drop caused by cumbersome lift in order to use. 

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