Valve is a pipe accessories. It is used to change the channel cross-section and flow direction, the control flow of a medium transport device. Specifically, the valve has the following purposes.

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Hydraulic control valve is a self-lubricating type of water body use, without additional oil lubrication, the main valve in case of damaged parts, please follow the following instructions to demolition.

Hydraulic control valve is a pressure control valve , which consists of a main valve and pilot valve attached to the catheter needle valve ball valve and pressure gauges and other components.

Various types of flow characteristics are available. This tutorial discusses the three main types used in water and steam flow applications: fast opening, linear, and equal percentage flow; how they compare, and how (and why) they should be matched to the application in which they are used.

Valves need to be measured on their capacity to pass fluid. To enable fair comparison, valves are sized on a capacity index or flow coefficient.

Sizing a control valve for a steam application can be a complex matter. This Module attempts to throw light on the subject by using first principles to explain the relationship between flow and pressure drop.

The choice of valve for a particular application depends on various factors such as the fluid flow rate, the process temperatures and pressures, and whether the fluid is corrosive or abrasive.