Some of distribution characteristics of flow parameters are given in the dynamical process of the closing valve,the pressure frequencies are focused on the 200Hz below before the valve,and the diffusion of vortices is significant after the valve.
给出了阀门关闭动态过程中一些内流参数特征分布,阀前压力集中在200 Hz以下,阀后涡系扩散明显。
Valve Disadvantages: The valve is difficult to close and requires the operator to double close the valve.
阀门的缺点：阀门难以关闭，要求操作者二次关闭阀门。
"Before installation, check line of flow through valve so that valve will function properly. Close valve completely before installation."
安装前,切断通过阀门的流体,以使阀门工作正常。安装前要完全关闭阀门。
Some styles are spring-actuated for immediate closure when flow stops.
有些类型止回阀配置弹簧驱动,能够在流动停止时,立即关闭阀门。
The stem rises and lowers as the valve is opened and closed.
当阀门开启或关闭时，阀杆上升或下降。
The stem position provides indication that valve is opened or closed.
阀杆的高低能够指示阀门处于开启或关闭状态。
The Numerical Research on Control Characteristics of Closing Valve in Pressure Pipeline
有压管路中阀门关闭特性的数值研究
After fitting of the valve, the valve should be maintained in a closed position to prevent any contamination from entering the cylinder.
连接好阀门后，阀门应保持关闭位置，为防止任何污染进入气瓶。
Prior to servicing any Watts valve, it is mandatory to shut down the water system by closing both the inlet and outlet shutoff valves.
在维修任何美国瓦茨阀门之前，必须先通过关闭进口和出口关闭阀来实现水系统的关闭。
Disc, the trim part of butterfly valves, rotates with the stem to open/close and modulate the valve.
蝶阀是随阀杆一起转动的蝶板作启闭件，用以实现阀门的开启，关闭与调节。
Keep valves closed when cylinders are not in service or empty.
当钢瓶没有使用或是空瓶的时候，保持阀门关闭。
The valve may be padlocked in full open or full closed position.
可以把阀门锁定在完全开启或完全关闭的位置。
When valve is filled, open the downstream shutoff slowly and fill the water supply system.
阀门注满后，慢慢开启下游关闭阀对水供应系统注水。
Controlled closing of the valve, opens the mainline check valve, gradually increasing line pressure.
阀门受到控制的关闭操作，开启主管线止回阀，逐渐增加管线压力。
The stem position indicates to the observer if the valve is opened or closed.
阀杆位置的高低,指明了阀门处于开启或关闭状态。
"The assembly should then be slipped onto the valve stem, with the valve in the closed position."
然后将蜗轮操作装置总成套在阀杆上,此时阀门应该处于关闭状态。
This will enable the stem to expand slightly without bending or damaging the valve and will not affect valve shutoff.
这将使得阀杆能够稍微扩张，不至于弯曲或损坏阀门，也不影响阀门的关闭。
"Shut off the electric power supply to heater, close cold water inlet, open a hot water faucet to allow air to enter the system and open the drain valve, which is threaded to receive a standard hose coupling."
首先关闭电源开关,关闭冷水进口阀门,打开热水水龙头让空气进入管道系统,并且打开排水阀。
This means that the operating mechanism must be able to move sufficiently far enough away from the valve to allow the valves to be fully closed against its seat by the valve spring.
这意味着操作机构必须离阀门足够远以允许阀门通过气门弹簧使其完全关闭。