Needle valve

needle valve and globe valve is a close relative of the needle valve serves to control the flow rate as well as the difference between the needle valve globe valve is used in applications requiring flow control with high resolution. (Normally, the flow rate was not much), so we found a needle valve with a small system. The gas pipeline system in the device or in a research lab but not exposed needle valve in a large system.

Figure 4 (top), and the structure of the Needle valve (bottom) is installed.


needle valve is a valve in the direction of flow as well as a globe valve, the difference between the needle valve and globe valve are designed openings and the shape of the plug by opening the needle valve is smaller than the openings of the globe. valve and the outlet of the needle valve has a slender cone with gradually smaller at the end. Of the plug of the needle valve has a taper such that the plug is not strong enough to force you to press the plug close to the seat of the body of the valve is pressed, it may cause. plug is damaged or lose its shape. Therefore, manufacturers are designed to plug the needle valve is not in contact with the body of the valve seat, but the gap is negligible. As a result, when we rotate the needle valve all the way down the plug valve is closed completely. (This is different from a globe valve, which can be turned off completely), so the needle valve is installed must have a block valve (which is usually a gate valve or ball valve) and as shown in Figure 4 above.