了解NPT、NPTF和NPS螺纹的连接方式
NPS、NPT和NPTF之间的区别是什么？
NPS = National Pipe Straight
NPT = National Pipe Thread
NPTF = National Pipe Thread Fuel
NPT和NPS都有相同的螺纹角度、形状和间距（每英寸的螺纹）。然而，NPT螺纹是锥形的，NPS螺纹是直的（平行）。两种螺纹都有一个60°的包含角，并有平坦的山峰和谷底。锥形管螺纹通常出现在管子、管嘴和配件（例如：接头、弯头、三通等）的末端。
锐角螺纹对连接处的密封性和无泄漏非常关键。通常需要使用螺纹密封剂或胶带来完成密封。直管螺纹需要一个垫圈或O型圈来形成密封。虽然NPT和NPS螺纹可以啮合，但它们彼此之间不能正常密封。
NPT与NPTF
NPT（National Pipe Thread）的要求在ANSI B1.20.1中有详细说明。
NPTF（National Pipe Thread Fuel）的要求在ANSI B1.20.3中有详细说明。
NPT和NPTF都有相同的螺纹，即每英寸、螺距直径和锥度-每英寸。区别在于主要直径和次要直径，以及螺纹的根部和顶点。
NPTF螺纹牙顶符合NPT要求的参数，但比NPT的范围要小。
NPTF螺纹的根部与NPT螺纹的根部不同。NPTF螺纹根部的设计是为了与配合的螺纹顶点相干涉，目的是在装配时通过螺纹形状的变形形成机械密封。NPTF螺纹有两个等级。1级和2级。NPT螺纹的根部被设计为允许在装配时与配合的螺纹顶点有间隙。
NPT和NPS
虽然NPT和NPS螺纹会啮合，而且看起来很合适，但它们不会相互正确密封，从而导致泄漏。
创建一个无泄漏的NPT连接需要使用螺纹密封胶带。
National Pipe Taper Fuel（NPTF），也称为Dryseal American National Standard Taper Pipe Thread，由ASME B1.20.3定义，旨在提供更无泄漏的密封，无需使用PTFE胶带（又称 "特氟隆"）或其他密封剂化合物。NPTF螺纹具有相同的基本形状，但其顶点和根部高度调整为过盈配合，消除了螺旋形的泄漏路径。
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