成人做爰免费视频免费看_成人a级高清视频在线观看,成人a大片在线观看,成人a大片高清在线观看,成人av在线播放,一a一级片,一级黄 中国色 片,一级黄 色蝶 片,一级黄色 片生活片

寶德角座閥BURKERT氣動(dòng)調(diào)節(jié)閥主要性能及測(cè)試
寶帝氣動(dòng)調(diào)節(jié)閥主要性能及測(cè)試： 氣動(dòng)調(diào)節(jié)閥的性能指標(biāo)有：基本、回差、死區(qū)、始終點(diǎn)偏差、額定行程偏差、泄漏量、密封性、耐壓強(qiáng)度、外觀、額定流量系數(shù)、固有流量特性、耐振動(dòng)性能、動(dòng)作壽命，計(jì)13項(xiàng)、前9項(xiàng)為檢驗(yàn)項(xiàng)目。由于調(diào)節(jié)閥的運(yùn)輸、工作彈簧范圍的調(diào)整等因素，安裝前往往需要對(duì)如下性能進(jìn)行調(diào)整、檢驗(yàn)： 1）基本將規(guī)定的輸入信平穩(wěn)地按增大和減小方向輸入執(zhí)行機(jī)構(gòu)氣（或定位器），測(cè)量各點(diǎn)所對(duì)應(yīng)的行程值，計(jì)算出實(shí)際“信－行程”關(guān)系與理論關(guān)系之間的各點(diǎn)。其zui大值即為基本。試驗(yàn)點(diǎn)應(yīng)至少包括信范圍0、25％、50％、75％、100％這5個(gè)點(diǎn)。測(cè)量?jī)x表基本限應(yīng)小于被試閥基本限的1/4。 2）回差試驗(yàn)程序與上面第1）點(diǎn)所述相同。在同一輸入信上所測(cè)得的正反行程的zui大差值即為回差。 3）始終點(diǎn)偏差方法同第1）點(diǎn)。信的上限（始點(diǎn)）的基本即為始點(diǎn)偏差；信的下限（終點(diǎn)）的基本為終點(diǎn)偏差。 4）額定行程偏差將額定輸入信加入氣動(dòng)執(zhí)行機(jī)構(gòu)氣（或定位器），使閥桿走*程，實(shí)際行程與額定行程之差與額定行程之比即為額定行程偏差。實(shí)際行程必須大于額定行程。 5）泄漏量試驗(yàn)介質(zhì)為10～50℃的清潔氣體（空氣和氮?dú)猓┗蛞后w（水或煤油）；試驗(yàn)壓力A程序?yàn)椋寒?dāng)閥的允許壓差大于350KPa時(shí)，試驗(yàn)壓力均按 350KPa做，小于350KPa時(shí)按允許壓差做；B試驗(yàn)程序按閥的zui大工作壓差做。試驗(yàn)信壓力應(yīng)確保閥于關(guān)閉狀態(tài)。在A試驗(yàn)程序時(shí)，氣開閥執(zhí)行機(jī)構(gòu)信壓力為零；氣閉閥執(zhí)行機(jī)構(gòu)信壓力為輸入信上限值加20KPa；兩位式閥執(zhí)行機(jī)構(gòu)信壓力應(yīng)為設(shè)計(jì)規(guī)定值。在B試驗(yàn)程序時(shí)，執(zhí)行機(jī)構(gòu)的信壓力應(yīng)為設(shè)計(jì)規(guī)定值。試驗(yàn)介質(zhì)應(yīng)按規(guī)定流向加入閥內(nèi)，閥出口可通大氣或連接出口通大氣的低壓頭損失的測(cè)量裝置，當(dāng)確認(rèn)閥和下游各連接管道*充滿介質(zhì)后方可測(cè)取泄漏。產(chǎn)品： ：   
寶德角座閥BURKERT氣動(dòng)調(diào)節(jié)閥主要性能及測(cè)試
The pneumatic control valve performance and testing: Pneumatic control valve performance indicators are: the basic error, backlash, dead zone, always point deviation, the deviation of rated travel, leakage, sealing, compressive strength, appearance, rated flow coefficient, the inherent flow characteristics and resistance to vibration performance, action life, namely, 13, 9 test items to the factory. Control valve of the transport, the work of the spring range of adjustments, and other factors, before the installation often requires the following capabilities to adjust, test: 1） the basic error of the provisions of the input signal is a smooth increase and decrease direction input actuator air chamber （or locator）, the measurement points corresponding to the trip value to calculate the actual "signal - travel relations with the theoretical relationship between the various points of error. And its maximum is the basic error. The test points shall include at least 0,25% of signal range, 50%, 75%, 100% 5 points. Measuring instruments and the basic error limit should be less than 1/4 valves were tested basic error limit. 2） The hysteresis test procedures described in the above 1）. The maximum difference measured by the pros and cons of travel on the same input signal is a hysteresis. 3） always point deviation method with 1）. The upper limit of the signal （starting point） at the basic error is the starting point bias; the basic error of the minimum signal （end） at the end of deviation. 4） Rated stroke deviation rated input signal to join the pneumatic actuator chamber （or locator）, so that the stem end of the route is rated travel deviation, the difference of the actual trip and rated travel and rated travel. The actual itinerary must be greater than the rated travel. 5） leakage test medium for 10 ~ 50 ° C in the clean gas （air and nitrogen） or liquid （water or kerosene）; A program of the test pressure: when the valve to allow pressure greater than 350KPa, the test pressure at 350KPa do allowing the pressure to do less than 350KPa; B test procedures differential pressure valve work to do. The test signal pressure should ensure that the valve is turned off. A pilot program, the open air valve actuator signal pressure is zero; gas closing valve actuator signal pressure to the upper limit of the input signal plus 20KPa; two type valve actuator signal pressure should be the design requirements. B test program, the executive body of the signal pressure should be required for the design value. Test medium should be required to flow to join the valve, the valve outlet can direct export of the atmosphere or connected through the atmosphere of low head loss measuring device, when the measurements taken to confirm the valve and downstream of the connecting pipes compley filled with medium before leakage.
寶德角座閥BURKERT氣動(dòng)調(diào)節(jié)閥主要性能及測(cè)試