缸體執(zhí)行機(jī)構(gòu)
Cylinder Actuators

　　空氣或燃?xì)飧左w執(zhí)行機(jī)構(gòu)包括單動(dòng)或雙動(dòng)，由機(jī)械彈簧或氣動(dòng)力實(shí)現(xiàn)故障開(kāi)啟或關(guān)閉等各種類(lèi)型?？諝飧左w執(zhí)行機(jī)構(gòu)的局限性在于機(jī)械彈簧的局限性和要求推力不超過(guò)75,000磅?？諝飧左w執(zhí)行機(jī)構(gòu)所采用的機(jī)械彈簧可以達(dá)到20,000磅的推力，及Z大14英寸的沖程限制，主要取決于所需要的輸出推力。
　　Air or gas cylinder actuators include single or double acting, fail open or closed by mechanical spring or pneumatic force. They can be manufactured to accommodate any length stroke. The limitations of air cylinder actuators are mechanical spring limitsthrust requirements in excess of 75,000 Ibs. Mechanical springs used with air cylinders can be sized for up to 20,000 Ibs. of thrusthave a stroke limit of about 14" max. depending on thrust output required.
　　對(duì)于有些無(wú)法采用機(jī)械彈簧的應(yīng)用場(chǎng)合，可以配置氣動(dòng)彈簧，以?xún)?chǔ)備足夠?qū)崿F(xiàn)故障安全功能的氣源壓力。大于25,000磅的推力要求可以通過(guò)配置標(biāo)準(zhǔn)鏜孔的缸體執(zhí)行機(jī)構(gòu)來(lái)實(shí)現(xiàn)，在此假定現(xiàn)場(chǎng)氣源壓力Z小為80 PSIG。在25,000磅至75,000磅之間的推理要求可以通過(guò)對(duì)現(xiàn)場(chǎng)氣源進(jìn)行增壓或加強(qiáng)，使其有更的工作壓力來(lái)滿足缸體執(zhí)行機(jī)構(gòu)的要求，并儲(chǔ)存在當(dāng)?shù)氐膲簹夤迌?nèi)。
　　In applications where mechanical springs can not be used, a pneumatic spring provided with stored air pressure is capable of providing a fail safe mode. Thrust requirements up to 25,000 Ibs. can be accommodated with standard bore size cylinders assuming minimum 80 PSIG field air supply. Thrust requirements between 25,000 Ibs.75,000 Ibs. can be accommodated by boosting or intensifying field air pressure to a higher working pressure for the cylinderstored locally in a high pressure air tank.
　　對(duì)于超過(guò)75,000磅的推力要求，液動(dòng)系統(tǒng)會(huì)更加適合，也更加經(jīng)濟(jì)。缸體執(zhí)行機(jī)構(gòu)可以配置針對(duì)緊急狀態(tài)下的手動(dòng)過(guò)載裝置，閥門(mén)驅(qū)動(dòng)，故障安全功能和其它附件。
　　Hydraulic systems are better suitedmore economical for thrust requirements over 75,000 Ibs. Cylinder actuators can be provided with manual overrides for emergency valve actuation, fail safe modeother accessories.

隔膜執(zhí)行機(jī)構(gòu)
Diaphragm Actuators

　　隔膜執(zhí)行機(jī)構(gòu)適用于：雙動(dòng)氣壓開(kāi)啟或關(guān)閉，直接作用氣壓關(guān)閉，機(jī)械彈簧開(kāi)啟或反向作用機(jī)械彈簧關(guān)閉，氣壓開(kāi)啟。
　　Diaphragm actuators available are: double acting air pressure required open or close, direct acting air pressure required to close, mechanical spring to open or reverse acting mechanical spring to close, air pressure required to open.
　　這是一種很簡(jiǎn)單也很經(jīng)濟(jì)的執(zhí)行機(jī)構(gòu)，但是應(yīng)用的局限性也比較大。*種局限在于沖程，對(duì)于大多數(shù)制造商來(lái)說(shuō)，4英寸就是Z大的沖程。這種局限性使得隔膜執(zhí)行機(jī)構(gòu)只能適用于通徑DN100以下的閘閥和更小通徑的截止閥。第二種局限性在于輸出推力，這是無(wú)法為我們的不平衡旋塞截止閥選擇這種執(zhí)行機(jī)構(gòu)的主要原因。大多數(shù)制造商可以提供面積達(dá)到200平方英寸的隔膜，但是，可用于執(zhí)行機(jī)構(gòu)的Z大氣源壓力卻在遞減。大多數(shù)主要制造商提供的大面積隔膜的Z大氣源壓力小于45 PSIG，因此限制了推力的輸出。作為選配件，可提供手動(dòng)過(guò)載手輪。
　　This very simplevery economical actuator has application limitations. The first limitation is stroke; a 4" stroke is the longest available from most manufacturers. This limits adaptable valve size to gate valves 4"smallerglobe valves in smaller sizes. The second limitation is output thrust, this is the major constraint in selecting this type of actuator for use with our unbalanced plug globe valves. Most manufacturers can provide diaphragm areas up to 200 square inches, however, maximum air pressure allowed for actuation decreases. Maximum air pressures are as low as 45 PSIG for large area diaphragms available from most major manufacturers thus limiting thrust output. Manual override handwheels are available as an option.

1. 閥門(mén)通徑，型號(hào)或規(guī)格說(shuō)明。
   Valve size, figure number or description.
2. 操作條件壓力，溫度，流量和流體介質(zhì)。
   Operating conditions pressure, temperature, flow ratefluid.
3. Z大關(guān)閉壓差。
   Maximum differential shut-off pressure.
4. 主要?jiǎng)恿?yīng) - 空氣或液體 - 可提供的Z大和Z小壓力和動(dòng)力源。
   Primary power supply—air or hydraulic—available maximumminimum pressuresource.
5. 故障處理模式開(kāi)啟，關(guān)閉？
   Failure mode open, closed, as is?.
6. 控制電壓和外殼結(jié)構(gòu)NEMA，等等。
   Control voltageenclosure designations NEMA, etc..
7. 輔助設(shè)備：
   Auxiliary equipment:
   1. 限制開(kāi)關(guān)，
      limit switches,
   2. 電磁閥，
      solenoids,
   3. 定位器，
      positioners,
   4. 手動(dòng)過(guò)載裝置
      manual over-rides.
8. 閥門(mén)定位。
   Valve orientation.
9. 如果有的話，所偏愛(ài)的制造商。
   Preference for specific manufacturer, if any.