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原文:
Sanitary diaphragm valve is a special form of cut-off valve. It's opening and closing parts is a material with a soft membrane made of, the body cavity with the valve cover cavity and drive components are separated, it said diaphragm. Diaphragm following features: the most prominent characteristic of the diaphragm to the lower part of the body cavity and the upper chamber separated from the valve cover, so that the diaphragm is located above the valve stem, valve and other parts from corrosion, eliminating the need for packing structure, and no media leaks. 1, made of rubber or plastic membrane made of soft sealing, sealing well. As for the vulnerability of the diaphragm, should be replaced periodically depending on the media characteristics. 2, limited by the diaphragm material, diaphragm valve suitable for low pressure and high temperature. 3, the diaphragm valve structure can be divided into: house type diaphragm valve, DC diaphragm valve, globe diaphragm valve, straight through diaphragm valves, weir diaphragm valve and rectangular diaphragm valve six; connection usually in the form of flange connection (fast connection); drive can be divided into manual, electric and three, which is divided into pneumatic drive normally open, normally closed type and reciprocating three. Sanitary diaphragm valve is the valve stem of the elastomer film pressed on the seat to cut off gas. Rotate the hand wheel can be driven on the stem, to move, to leave the seat open diaphragm valves or diaphragm pressed to close the valve on the valve seat. The valve such as the NBR diaphragm (silica gel film, three yuan and so on), applicable to the front stage and pre drainage pipeline and the temperature is -25 ℃ ~ 80 ℃ non corrosive gas. Such as the use of fluorine rubber diaphragm, can be used in high vacuum system, temperature range is -30 ℃ ~ 150 ℃.卫 生级隔膜阀的简介。
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以下是参考译文:

译文:
卫生级隔膜阀是一种特殊形式的截断阀。    它的启闭件是一块用软质材料制成的隔膜,把阀体内腔与阀盖内腔及驱动部件隔开,故称隔膜 阀。隔膜阀的特点如下:最突出特点是隔膜把下部阀体内腔与上部阀盖内腔隔开,使位于隔膜上方的阀杆、阀瓣等零件不受介质腐蚀,省去了填 料密封结构,且不会产生介质外漏。    1、采用橡胶或塑料等软质密封制作的隔膜,密封性较好。由于隔膜为易损件,应视介质特性而定 期更换。    2、受隔膜材料限制,隔膜阀适用于低压和温度相对不高的场合。    3、隔膜阀按结构形式可分为:屋式隔膜阀、直流式 隔膜阀、截止式隔膜阀、直通式隔膜阀、闸板式隔膜阀和直角式隔膜阀六种;连接形式通常为法兰连接(快装连接);按驱动方式可分为手动、电 动和气动三种,其中气动驱动又分为常开式、常闭式和往复式三种。    卫生级隔膜阀是利用阀杆将弹性体薄膜紧压在阀座上用来隔断气路 。转动手轮可带动阀杆上、下移动,使隔膜离开阀座打开阀门或使隔膜紧压在阀座上关闭阀门。此种阀门如采用丁晴橡胶隔膜(硅胶膜片,三元乙 丙等),适用于前级和预抽管道上及温度为-25~80℃的非腐蚀性气体。如采用氟橡胶隔膜,可用于高真空系统,使用温度范围为-30~150℃。卫 生级隔膜阀的简介。