清洗时由管路阀门控制液体倒流，十分方便。
When cleaning, the valve of the pipeline controls the backflow of the liquid with convenience.
所有这些固体污染物都可能堵塞细小的孔、空气管路、设备和阀门，也造成粉末涂装工件的污染。
All these solid pollutants may jam tiny hole, air lines, equipment and valve, also caused the pollution of powder coating workpieces.
往复泵启动前必须将排出管路中的阀门打开。
Reciprocating pump discharge pipe must be before the start of the valve to open.
如果节流较小，将因此产生更高的压降将可能导致空穴现象或超快流速，从而导致噪音太高，振动剧烈，可能损坏阀门或相邻的管路。
Closer throttling, creating higher pressure drops may cause cavitation or excessive velocities which could cause high noise levels, vibration and possible damage to the valve or adjacent piping.
高粘度泵可配安全阀，当泵或管路系统超压时，安全阀门打开，形成内部回流，保证系统安全。
High viscosity pump can match the relief valve, when the pump and piping system overpressure, safety valve is opened, the formation of internal reflux, ensure the safety of the system.
管路流速太低或太高都可能损坏阀门内部构件，缩短阀门使用寿命。
Either too low a line velocity or too high a velocity can damage valve internals and shorten valve life.
管路上的各种阀门在安装前要拆开清洗，检查阀柄是否灵活，并经试压不漏后方可安装。
Take apart all valves along the pipeline for washing before installation, check whether valve handles are flexible. The valves can be installed after passing the pressure test.
一种典型的应用是，把阀门安装在系统水泵附近的旁通管路中。
A typical application is that mount the valve nearby the by-pass pipes of the pump of the system.
打开油管管路和水管管路上有关的阀门。
Open the relevant valves on the oil pipe line and the water pipe line.
管路是由管子、管件和阀门组成。
启动前应全开吸入和排出管路中的阀门，严禁闭阀启动。
Should be fully open before the start of suction and discharge pipe valves, non-closing valve started.
主要是高压水发生器、阀门管路配件、自动化控制水平较低，经验较少。
Is mainly the high-pressured water generator, the valve pipeline fitting, the automation control level is low, the experience are few.
启动前应全开吸入和排出管路中的阀门，严禁闭阀启动。
Should be fully open before the start of the suction and discharge pipe valves, non-closing valve to start.
当通过阀门的压降为管路压力的20%左右时，美国克雷恩截止阀就能够高效应用在频繁操作和节流的应用场合。
Crane globe valves are highly efficient for services requiring frequent operation and throttling when pressure drop across the valve is about 20% of inlet pressure.
所有机械设备应尽量处于可工作状态，即管路及系统内的油水到位，但须关好阀门。
Machinery to be in working condition as far as possible, i. e. water and oil to be in system, but all valves to be closed.
在实际管道工程中，阀门阀道的局部水头损失占管路水头损失的比例是相当大的。
Actually, in the tube engineering, the proportion of the loss of local water head in the loss of pipeline water head is big.
为了便于安装和拆卸螺纹连接的阀门，在管路系统的适当位置上可用管接头。
In order to facilitate the installation and removal of threaded connection valves, piping system at the appropriate location can be used on pipe joints.
在生产中，只有管路畅通，阀门调节适当，生产才能正常运行。
In production, only when the pipeline is unblocked and the valves are regulated appropriately can the process function normally.
管路用钢法兰盘，锻制管接头，阀门和零件的通用要求规范。
Standard Specification for Common Requirements for Steel Flanges, Forged Fittings, Valves, and Parts for Piping Applications.
阀门与管路连接采用焊接式结构。
A welding structure is used to connect the valve and pipelines.
保温球阀具有良好的保温保冷特性，且阀门的通径与管径一致，同时又能有效降低管路中介质热量损失。
Ball has good thermal insulation cold insulation properties, the valve diameter the diameter line pipe in the same time reduce medium heat loss.
低温热水地面辐射供暖系统由热源，分、集水器，绝热层，加热管，填充层以及管路、阀门、过滤器等组成。
Low temperature hot water floor radiant heating system consists of heat source, and the collector, the heat insulation layer, heating pipe, pipeline, valve, filling layer and filter etc...
本文重点先容几种给水管路的常用阀门选型及注意事项。
Priority introduces the main body of a book almost growing water supply pipeline valve in common use choosing the type and matters needing attention.
当没有液体流经管路时，起初的反应是由于周围的温降和阀门打开时产生的。
When no fluid is flowing through the pipe, the initial response is due to an ambient temperature drop and the valve begins to open.
阀门是流体输送管路的重要控制设备，广泛应用于国民经济各个领域。
As the important control equipment of fluid transport pipeline, valve is widely used in different domains of national economy.
保温球阀具有良好的保温保冷特性，且阀门的通径与管径一致，同时又能有效降低管路中介质热量损失。
Ball has good thermal insulation cold insulation properties, and the valve diameter and the diameter line pipe in the same time reduce medium heat loss.
保温球阀具有良好的保温保冷特性，且阀门的通径与管径一致，同时又能有效降低管路中介质热量损失。
Ball has good thermal insulation cold insulation properties, and the valve diameter and the diameter line pipe in the same time reduce medium heat loss.
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