译文：

排水闸阀的启闭件是闸板，闸板的运动方向与流体方向相垂直，闸阀只能作全开和全关 , 不能作调节和节流。闸板有两个密封面 , 最常用的模式闸板阀的两个密封面形成楔形、楔形角随阀门参数而异 , 通常为 50, 介质温度不高时为 2°52'''''''''''''''' 。楔式闸阀的闸板可以做成一个整　体，叫做刚性闸板；也可以做成能产生微量变形的闸板 , 以改善其工艺性 , 弥补密封面角度在加工过程中产生的偏差 , 这种闸板叫做弹性闸板。 闸阀关闭时 , 密封面可以只依靠介质压力来密封 , 即依靠介质压力将闸板的密封面压向另一侧的阀座来保证密封面的密封，这就是自密封。大部分闸阀是采用强制密封的 , 即阀门关闭时，要依靠外力强行将闸板压向阀座 , 以保证密封面的密封性。 闸阀的闸板随阀杆一起作直线运动的，叫升降杆闸阀 亦叫明杆闸阀。通常在升降杆上 有梯形螺纹，通过阀门顶端的螺母以及阀体上的导槽，将旋转运动变为直线运动 , 也就是将操作转矩变为操作推力。 开启阀门时，当闸板提升高度等于阀门通径的1：1倍时，流体的通道xx畅通，但在运行时，此位置是无法监视的。实际使用时，是以阀杆的顶点作为标志，即开不动的位置，作为它的全开位置。为考虑温度变化出现锁死现象 , 通常在开到顶点位置上 , 再倒回 1/2－1圈 , 作为全开阀门的位置。因此 , 阀门的全开位置，按闸板的位置（即行程〉来确定。 有的闸阀 , 阀杆螺母设在闸板上，手轮转动带动阀杆转动 , 而使闸板提升 , 这种阀门叫做旋转杆闸阀或叫暗杆闸阀。 闸阀具有以下优点： 流体阻力小 , 密封面受介质的忡刷和侵蚀小。 开闭较省力。 介质流向不受限制 , 不扰流、不降低压力。 形体简单 , 结构长度短，制造工艺性好，适用范围广。 闸阀的缺点如下： 密封面之间易引起冲蚀和擦伤，维修比较困难。 外形尺寸较大，开启需要一定的空间，开闭时间长。 结构较复杂。 闸阔的种类 ,按密封面配置可分为楔式闸板式闸阀和平行闸板式闸阀 , 楔式闸板式闸阀又可 分为 : 单闸极式、双闸板式和弹性闸板式；平行闸板式闸阀可分为单闸板式和双闸板式。按阀杆的螺纹位置划分，可分为明杆闸阀和暗杆闸阀两种。 闸阀的安装与维护应注意以下事项： 手轮、手柄及传动机构均不允许作起吊用，并严禁碰撞。 双闸板闸阀应垂直安装（即阀杆处于垂直位置 , 手轮在顶部 。 带有旁通阀的闸阀在开启前应先打开旁通阀（以平衡进出口的压差及减小开启力 。 带传动机构的闸阀，按产品使用说明书的规定安装。 如果阀门经常开关使用 , 每月至少润滑一次。

“ Basic knowledge of the drainage valve ”是由提供的国际阀门新闻，译文仅供参考。另外，中国闸阀网还提供相关产品搜索：、、、、等。

原文：
Drain valve to open and close a gate parts, gate movement direction perpendicular to the direction of fluid, valve only for full-and full-off, can not be adjusted and cut expenditure. There are two gate sealing surface, the most common mode of gate valve sealing surface to form two wedge-shaped, wedge-shaped angle with the valve parameters vary, usually 50, medium temperature is not high when 2 ° 52''''' '''''''''''. Wedge Gate Valve gate can be made into a whole, called the rigid damper; also be made to produce small quantities of deformation gate in order to improve their craft-oriented, to make up the sealing surface angle in the processing error generated in the process, this sluice gate is called elastic. Valve closed, the sealing surface can only rely on media pressure to seal, that is, to rely on media pressure to ram pressure to the other side of the sealing surface of the seat to ensure the sealing surface of the seal, which is self-sealing. Most of mandatory sealed valve is used, namely, the valve is closed, we must rely on outside pressure to force the gate to the seat in order to ensure the sealing surface of the seal. Along with the stem of the gate valve for linear motion, and called the lift rod valve gate valve is also called the next shot. Often movements are trapezoidal threaded rod through the valve nut and the valve on the top of the guide groove, rotating motion into linear motion, that is, the operation of torque, thrust into action. Open the valve, when the gate valve lifting height is equal to 1:1 times the diameter, the fluid flow channel completely, but at run time, this location can not be monitored. Actual use, based on the apex of stem as a sign that the movement of non-position, as its fully open position. Temperature changes appear to consider locking phenomenon, usually open to the vertex position, and then inverted back 1/2-1 circle, as a fully open valve position. Therefore, the valves fully open position, according to damper position (ie, travel "to determine. Some valve, the stem nut is located at the gate, the hand-driven rotation of valve stem rotation, leaving gate to upgrade, this valve is called the rotating rod valve or valve called the dark bar. Valve has the following advantages: Fluid resistance is small, the sealing surface by the media, distressed small brush and erosion. Open and close more effort. Medium flows unrestricted, non-spoiler, without reducing pressure. A simple shape, structure, length short, good manufacturing processes applicable to a wide range. Valve defects are as follows: Between the sealing surface could easily cause erosion and abrasion, maintenance more difficult. Overall large size, open requires a certain space, opening and closing a long time. Structure is more complicated. The type of gate width, according to the sealing surface configuration can be divided into wedge gate-type valve and parallel gate-type valve, wedge gate-type valve can be divided into: single-gate type, Shuangzha plate and elastic gate type; parallel gate-type valve can be divided into single-ram type and Shuangzha plate. Classified according to location of threaded stem can be divided into Ming and dark rod valve valve two kinds of stroke. Valve installation and maintenance should note the following items: Hand-wheel, handle and the transmission mechanism for lifting are not allowed to use, and are prohibited from collisions. Shuangzha vertical plate gate valve should be installed (ie the stem in a vertical position, the hand wheel at the top. With a bypass valve to open the valve opening should be preceded by-pass valve (in order to balance imports and exports and reduce the opening force of the pressure. The valve with a transmission mechanism, according to product instructions for the installation. If you frequently switch the valve to use, lubrication at least once a month.

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