译文：
减压阀共有三种类型: 作用式减压阀。最简单的减压阀，直接作用式减压阀，带有平膜片或波纹管。因为减压阀是独立结构，因此无需在下游安装外部传感线。减压阀是三种减压阀中体积最小、使用最经济的一种，专为中低流量设计。直接作用式减压阀的xx度通常为下游设定点的+/-10%。 薄膜式减压阀。在这种类型的减压阀中，双膜片代替了内导式减压阀中的活塞。减压阀这个增大的膜片面积能够打开更大的主阀，并且在相同的管道尺寸下，其容量比内导式活塞减压阀更大。另外，减压阀膜片对压力变化更为敏感，xx度可达+/-1%。xx性更高是由于下游传感线的定位（阀的外部），其所在位置气体或液体动荡更少。该减压阀非常灵活，可以采用不同类型的减压阀导阀（例如压力阀、温度阀、空气装载阀、电磁阀或几种阀同时配套适用）。 活塞式减压阀。该类型的减压阀集两种阀―导阀和主阀―于一体。导阀的设计与直接作用式减压阀类似。来自导阀的排气压力作用在活塞上，使活塞打开主阀。如果主阀较大，无法直接打开时，这种设计就会利用入口压力打开主阀。因此，这种类型的减压阀，与直接作用式减压阀相比，在相同的管道尺寸下，容量和xx度（+/-5%）更高。与直接作用式减压阀相同的是，减压阀内部感知压力，无须外部安装传感线。

“ Regulator Knowledge: valve of the classification and the role of ”是由提供的国际阀门新闻，译文仅供参考。另外，中国减压阀网还提供相关产品搜索：、、、、等。

原文：
There are three types of valve: role of the reducing valve. The simplest reducing valve, direct-action valve, with a flat diaphragm or bellows. Because the valve is an independent structure, there is no need to install an external sensing line downstream. Valve is a valve in the smallest of three, using the most economic one, designed for medium and low flow design. Direct Acting Valve is usually the accuracy of the downstream set point of + / -10%. Diaphragm valve. In this type of valve, the double diaphragm instead of reducing valve within the piston guide. This increases the diaphragm valve to open a larger area of the main valve, and in the same pipe size, its capacity than a larger valve inside the piston-guided. In addition, the valve diaphragm is more sensitive to pressure changes in an accuracy of up to + / -1%. Higher accuracy is due to the positioning of the downstream sensing line (valve external), their location less volatile gas or liquid. The valve is very flexible and can use different types of valve guide valve (such as pressure valves, temperature valve, air loading valve, solenoid valve or several valves at the same time supporting applicable). Piston valve. The type of pressure reducing valve set two kinds of valves - valve and main valve guide - in one. Valve guide the design and direct effect of reducing valve is similar. The discharge pressure from the lead role of valve piston, causing the piston to open the main valve. If the primary valve large, can not directly open, this design will use to open the main valve inlet pressure. Therefore, this type of pressure reducing valve, reducing valve, compared with a direct role in the same pipe size, the volume and accuracy (+ / -5%) higher. Direct-acting pressure reducing valve and the same is the internal sense the pressure reducing valve is no need to install an external sensing line.