高性能蒸汽減壓閥
簡要描述:高性能蒸汽(qi)減壓(ya)(ya)閥(fa)(fa)在普通減壓(ya)(ya)閥(fa)(fa)的基礎上(shang)做了很大(da)的改進。膜片采(cai)用了新型材(cai)料,并(bing)大(da)大(da)加(jia)工(gong)了工(gong)作面積,因此(ci)閥(fa)(fa)門(men)上(shang)游(you)壓(ya)(ya)力或下游(you)負荷細微(wei)的變(bian)化都能及時準確的反(fan)饋到主(zhu)(zhu)閥(fa)(fa)膜片,來調節主(zhu)(zhu)閥(fa)(fa)的開度,確保下游(you)壓(ya)(ya)力的穩定。
- 產(chan)品型號:YD43H
- 廠(chang)商性質:生產廠家
- 更新時間:2023-05-16
- 訪 問 量(liang):16443
高性能蒸汽減壓閥 | ||||||||||||||||||||||||
高性能蒸汽減壓閥結構特點和用處:
| ||||||||||||||||||||||||
25P蒸汽減壓閥性能指標:
25P蒸汽減壓閥主要技術參數:
| ||||||||||||||||||||||||
25P蒸汽(qi)減(jian)壓閥主要零件材料:
| ||||||||||||||||||||||||
25P蒸汽減壓閥流量系數(Cv)
| ||||||||||||||||||||||||
|
DN | L | H1 | H | D |
15 | 147 | 221 | 133 | 185 |
20 | 154 | 224 | 136 | 185 |
25 | 160 | 235 | 145 | 207 |
32 | 180 | 236 | 156 | 207 |
40 | 200 | 238 | 176 | 255 |
50 | 230 | 246 | 183 | 255 |
65 | 250 | 295 | 200 | 320 |
80 | 310 | 323 | 230 | 350 |
100 | 350 | 340 | 263 | 380 |
125 | 400 | 359 | 306 | 455 |
150 | 450 | 375 | 330 | 500 |
一種自動降低(di)管路工(gong)作壓(ya)(ya)力的(de)(de)專(zhuan)門(men)裝置,它可將閥前管路較高的(de)(de)水(shui)(shui)(shui)壓(ya)(ya)減(jian)少至閥后管路所需的(de)(de)水(shui)(shui)(shui)平。減(jian)壓(ya)(ya)閥廣泛用(yong)于(yu)高層建筑(zhu)、城市給水(shui)(shui)(shui)管網水(shui)(shui)(shui)壓(ya)(ya)過高的(de)(de)區域、礦井及其他場合,以保證給水(shui)(shui)(shui)系(xi)統中各(ge)用(yong)水(shui)(shui)(shui)點獲得適當的(de)(de)服務水(shui)(shui)(shui)壓(ya)(ya)和(he)流量。鑒于(yu)水(shui)(shui)(shui)的(de)(de)漏失率(lv)和(he)浪(lang)費程度(du)幾乎同給水(shui)(shui)(shui)系(xi)統的(de)(de)水(shui)(shui)(shui)壓(ya)(ya)大小(xiao)成正比,因此(ci)減(jian)壓(ya)(ya)閥具(ju)有改善(shan)系(xi)統運行工(gong)況(kuang)和(he)潛在節(jie)水(shui)(shui)(shui)作用(yong),據(ju)統計(ji)其節(jie)水(shui)(shui)(shui)效果約(yue)為30%。本閥門(men)為了調節(jie)準(zhun)確(que)水(shui)(shui)(shui)平按裝效果佳.
減(jian)(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)閥(fa)(fa)(fa)的(de)構造類型很(hen)多,以(yi)往常見的(de)有薄膜式(shi)、內(nei)彈簧活塞(sai)式(shi)等。減(jian)(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)閥(fa)(fa)(fa)的(de)基本作(zuo)用(yong)原(yuan)理是靠閥(fa)(fa)(fa)內(nei)流(liu)道對水流(liu)的(de)局部(bu)阻(zu)力降低水壓(ya)(ya)(ya)(ya),水壓(ya)(ya)(ya)(ya)降的(de)范(fan)圍由連接閥(fa)(fa)(fa)瓣的(de)薄膜或活塞(sai)兩側的(de)進出口(kou)水壓(ya)(ya)(ya)(ya)差自動(dong)調節。近年來又出現一些(xie)新型減(jian)(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)閥(fa)(fa)(fa),如定比(bi)式(shi)減(jian)(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)閥(fa)(fa)(fa),其構造原(yuan)理如圖14.2-2所示。定比(bi)減(jian)(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)原(yuan)理是利(li)用(yong)閥(fa)(fa)(fa)體(ti)中浮動(dong)活塞(sai)的(de)水壓(ya)(ya)(ya)(ya)比(bi)控制(zhi),進出口(kou)端減(jian)(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)比(bi)與(yu)進出口(kou)側活塞(sai)面積比(bi)成反比(bi)。這(zhe)種減(jian)(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)閥(fa)(fa)(fa)工作(zuo)平穩無振動(dong);閥(fa)(fa)(fa)體(ti)內(nei)無彈簧,故無彈簧銹蝕、金屬(shu)疲勞失效之慮;密封性(xing)能(neng)良好不(bu)滲漏,因而既減(jian)(jian)(jian)(jian)動(dong)壓(ya)(ya)(ya)(ya)(水流(liu)動(dong)時)又減(jian)(jian)(jian)(jian)靜壓(ya)(ya)(ya)(ya)(流(liu)量為0時);特別是在減(jian)(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)的(de)同(tong)時不(bu)影(ying)響水流(liu)量。
應該看到,水流通過減壓閥雖有(you)很大的(de)水頭損失(shi),但由于減少了水的(de)浪費并使系統流量分(fen)布(bu)合理、改善了系統布(bu)局與工(gong)況(kuang),因(yin)此總(zong)體上(shang)講仍是節能的(de)。
1、直(zhi)動式(shi)減壓(ya)閥
圖(tu)(tu)14—1直動式減(jian)壓閥(fa)(fa)圖(tu)(tu)14—1a所示為直動式帶(dai)溢(yi)流閥(fa)(fa)的減(jian)壓閥(fa)(fa)(簡(jian)稱溢(yi)流減(jian)壓閥(fa)(fa))的結構圖(tu)(tu)。
壓(ya)(ya)(ya)力(li)為P1的(de)(de)壓(ya)(ya)(ya)縮(suo)空氣,由左(zuo)端輸(shu)入(ru)經閥(fa)口(kou)10節(jie)流后,壓(ya)(ya)(ya)力(li)降(jiang)為P2輸(shu)出。P2的(de)(de)大(da)小(xiao)(xiao)可由調壓(ya)(ya)(ya)彈簧(huang)2、3進行調節(jie)。順時(shi)針旋轉旋鈕1,壓(ya)(ya)(ya)縮(suo)彈簧(huang)2、3及膜片5使閥(fa)芯8下移,增大(da)閥(fa)口(kou)10的(de)(de)開度使P2增大(da)。若反(fan)時(shi)針旋轉旋鈕1,閥(fa)口(kou)10的(de)(de)開度減(jian)小(xiao)(xiao),P2隨之減(jian)小(xiao)(xiao)。
若P1瞬(shun)時(shi)升(sheng)高(gao),P2將隨(sui)之升(sheng)高(gao),使(shi)(shi)膜(mo)片(pian)(pian)氣(qi)(qi)室6內壓(ya)(ya)力(li)(li)(li)(li)升(sheng)高(gao),在膜(mo)片(pian)(pian)5上(shang)產(chan)生的(de)推力(li)(li)(li)(li)相應增大,此推力(li)(li)(li)(li)破壞(huai)了原(yuan)來(lai)力(li)(li)(li)(li)的(de)平衡,使(shi)(shi)膜(mo)片(pian)(pian)5向上(shang)移(yi)(yi)動,有(you)少(shao)部分氣(qi)(qi)流(liu)經溢(yi)流(liu)孔(kong)(kong)12、排(pai)氣(qi)(qi)孔(kong)(kong)11排(pai)出(chu)。在膜(mo)片(pian)(pian)上(shang)移(yi)(yi)的(de)同時(shi),因復位(wei)(wei)彈(dan)簧(huang)(huang)(huang)9的(de)作(zuo)(zuo)用(yong)(yong)(yong),使(shi)(shi)閥芯8也(ye)向上(shang)移(yi)(yi)動,關(guan)(guan)小(xiao)(xiao)進氣(qi)(qi)閥口(kou)(kou)10,節(jie)(jie)(jie)流(liu)作(zuo)(zuo)用(yong)(yong)(yong)加大,使(shi)(shi)輸(shu)(shu)出(chu)壓(ya)(ya)力(li)(li)(li)(li)下(xia)降(jiang),直(zhi)至達(da)到(dao)新的(de)平衡為止,輸(shu)(shu)出(chu)壓(ya)(ya)力(li)(li)(li)(li)基本又回到(dao)原(yuan)來(lai)值。若輸(shu)(shu)入壓(ya)(ya)力(li)(li)(li)(li)瞬(shun)時(shi)下(xia)降(jiang),輸(shu)(shu)出(chu)壓(ya)(ya)力(li)(li)(li)(li)也(ye)下(xia)降(jiang)、膜(mo)片(pian)(pian)5下(xia)移(yi)(yi),閥芯8隨(sui)之下(xia)移(yi)(yi),進氣(qi)(qi)閥口(kou)(kou)10開大,節(jie)(jie)(jie)流(liu)作(zuo)(zuo)用(yong)(yong)(yong)減小(xiao)(xiao),使(shi)(shi)輸(shu)(shu)出(chu)壓(ya)(ya)力(li)(li)(li)(li)也(ye)基本回到(dao)原(yuan)來(lai)值。 逆時(shi)針旋(xuan)轉(zhuan)旋(xuan)鈕(niu)(niu)1。使(shi)(shi)調節(jie)(jie)(jie)彈(dan)簧(huang)(huang)(huang)2、3放(fang)松,氣(qi)(qi)體作(zuo)(zuo)用(yong)(yong)(yong)在膜(mo)片(pian)(pian)5上(shang)的(de)推力(li)(li)(li)(li)大于調壓(ya)(ya)彈(dan)簧(huang)(huang)(huang)的(de)作(zuo)(zuo)用(yong)(yong)(yong)力(li)(li)(li)(li),膜(mo)片(pian)(pian)向上(shang)曲,靠復位(wei)(wei)彈(dan)簧(huang)(huang)(huang)的(de)作(zuo)(zuo)用(yong)(yong)(yong)關(guan)(guan)閉進氣(qi)(qi)閥口(kou)(kou)10。再旋(xuan)轉(zhuan)旋(xuan)鈕(niu)(niu)1,進氣(qi)(qi)閥芯8的(de)頂端與溢(yi)流(liu)閥座(zuo)4將脫開,膜(mo)片(pian)(pian)氣(qi)(qi)室6中的(de)壓(ya)(ya)縮空氣(qi)(qi)便(bian)經溢(yi)流(liu)孔(kong)(kong)12、排(pai)氣(qi)(qi)孔(kong)(kong)11排(pai)出(chu),使(shi)(shi)閥處于無輸(shu)(shu)出(chu)狀態。
總之,溢流(liu)減壓(ya)閥(fa)是靠進氣口(kou)的(de)節(jie)流(liu)作用(yong)減壓(ya),靠膜片上(shang)(shang)力的(de)平衡作用(yong)和(he)溢流(liu)孔的(de)溢流(liu)作用(yong)穩(wen)壓(ya);調節(jie)彈簧即可使輸(shu)出(chu)壓(ya)力在一定范圍(wei)內改變。為防止以(yi)上(shang)(shang)溢流(liu)式減壓(ya)閥(fa)徘出(chu)少量(liang)氣體對周圍(wei)環境的(de)污染,可采用(yong)不帶(dai)溢流(liu)閥(fa)的(de)減壓(ya)閥(fa)(即普(pu)通減壓(ya)閥(fa)),其符號(hao)如圖14—1c所示。
2、先導式減(jian)壓(ya)閥(fa)
圖14—2內部(bu)(bu)(bu)先(xian)導式(shi)(shi)減(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)(ya)閥(fa)(fa)(fa)(fa)(fa)(fa)當(dang)減(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)(ya)閥(fa)(fa)(fa)(fa)(fa)(fa)的(de)(de)(de)(de)輸(shu)出壓(ya)(ya)(ya)(ya)(ya)力(li)較高(gao)或通徑(jing)較大(da)(da)時,用調(diao)壓(ya)(ya)(ya)(ya)(ya)彈簧直(zhi)(zhi)接(jie)調(diao)壓(ya)(ya)(ya)(ya)(ya),則(ze)彈簧剛度(du)必然過大(da)(da),流(liu)量變(bian)化(hua)時,輸(shu)出壓(ya)(ya)(ya)(ya)(ya)力(li)波動較大(da)(da),閥(fa)(fa)(fa)(fa)(fa)(fa)的(de)(de)(de)(de)結構(gou)尺寸也將增大(da)(da)。為(wei)了(le)克(ke)服這些缺點(dian),可采用先(xian)導式(shi)(shi)減(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)(ya)閥(fa)(fa)(fa)(fa)(fa)(fa)。先(xian)導式(shi)(shi)減(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)(ya)閥(fa)(fa)(fa)(fa)(fa)(fa)的(de)(de)(de)(de)工作(zuo)原理與(yu)(yu)直(zhi)(zhi)動式(shi)(shi)的(de)(de)(de)(de)基本相(xiang)同(tong)。先(xian)導式(shi)(shi)減(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)(ya)閥(fa)(fa)(fa)(fa)(fa)(fa)所用的(de)(de)(de)(de)調(diao)壓(ya)(ya)(ya)(ya)(ya)氣體,是由(you)小(xiao)型的(de)(de)(de)(de)直(zhi)(zhi)動式(shi)(shi)減(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)(ya)閥(fa)(fa)(fa)(fa)(fa)(fa)供給的(de)(de)(de)(de)。若把小(xiao)型直(zhi)(zhi)動式(shi)(shi)減(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)(ya)閥(fa)(fa)(fa)(fa)(fa)(fa)裝(zhuang)在(zai)閥(fa)(fa)(fa)(fa)(fa)(fa)體內部(bu)(bu)(bu),則(ze)稱為(wei)內部(bu)(bu)(bu)先(xian)導式(shi)(shi)減(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)(ya)閥(fa)(fa)(fa)(fa)(fa)(fa);若將小(xiao)型直(zhi)(zhi)動式(shi)(shi)減(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)(ya)閥(fa)(fa)(fa)(fa)(fa)(fa)裝(zhuang)在(zai)主(zhu)閥(fa)(fa)(fa)(fa)(fa)(fa)體外部(bu)(bu)(bu),則(ze)稱為(wei)外部(bu)(bu)(bu)先(xian)導式(shi)(shi)減(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)(ya)閥(fa)(fa)(fa)(fa)(fa)(fa)。 圖14—2所示為(wei)內部(bu)(bu)(bu)先(xian)導式(shi)(shi)減(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)(ya)閥(fa)(fa)(fa)(fa)(fa)(fa)的(de)(de)(de)(de)結構(gou)圖,與(yu)(yu)直(zhi)(zhi)動式(shi)(shi)減(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)(ya)閥(fa)(fa)(fa)(fa)(fa)(fa)相(xiang)比,該閥(fa)(fa)(fa)(fa)(fa)(fa)增加了(le)由(you)噴(pen)嘴4、擋板(ban)3、固(gu)定節(jie)流(liu)孔9及氣室B所組成的(de)(de)(de)(de)噴(pen)嘴擋板(ban)放大(da)(da)環節(jie)。當(dang)噴(pen)嘴與(yu)(yu)擋板(ban)之間(jian)的(de)(de)(de)(de)距(ju)離發(fa)生微小(xiao)變(bian)化(hua)時,就會使B室中的(de)(de)(de)(de)壓(ya)(ya)(ya)(ya)(ya)力(li)發(fa)生根明顯(xian)的(de)(de)(de)(de)變(bian)化(hua),從(cong)而引起(qi)膜片10有較大(da)(da)的(de)(de)(de)(de)位移,去控(kong)制閥(fa)(fa)(fa)(fa)(fa)(fa)芯6的(de)(de)(de)(de)上下移動,使進氣閥(fa)(fa)(fa)(fa)(fa)(fa)口(kou)8開大(da)(da)或關(guan)小(xiao)、提高(gao)了(le)對閥(fa)(fa)(fa)(fa)(fa)(fa)芯控(kong)制的(de)(de)(de)(de)靈敏度(du),即提高(gao)了(le)穩壓(ya)(ya)(ya)(ya)(ya)精度(du)。
圖14—3外部先導式(shi)(shi)減壓(ya)閥(fa)(fa)的(de)主(zhu)閥(fa)(fa)圖14—3所示為外部先導式(shi)(shi)減壓(ya)閥(fa)(fa)的(de)主(zhu)閥(fa)(fa),其(qi)工作原理與(yu)直動(dong)式(shi)(shi)相同。在主(zhu)閥(fa)(fa)體外部還(huan)有一個小型直動(dong)式(shi)(shi)減壓(ya)閥(fa)(fa)(圖中末示出(chu)),由它來控(kong)制主(zhu)閥(fa)(fa)。此類閥(fa)(fa)適于(yu)通徑在20mm以上,遠距離(30m以內)、高(gao)處、危險處、調壓(ya)困難的(de)場合。
3、定值器
定值器是一種高精度的減壓(ya)閥,主要用于壓(ya)力(li)(li)(li)定值。目前有兩種壓(ya)力(li)(li)(li)規格的定值器:其氣源(yuan)壓(ya)力(li)(li)(li)分別(bie)(bie)為0.14MPa和0.35MPa,輸出(chu)壓(ya)力(li)(li)(li)范圍分別(bie)(bie)為0—0.1MPa和0一0.25MPa。其輸出(chu)壓(ya)力(li)(li)(li)波動不大于zui大輸出(chu)壓(ya)力(li)(li)(li)的1%,常用于需(xu)要供給精確(que)氣源(yuan)壓(ya)力(li)(li)(li)和信(xin)號壓(ya)力(li)(li)(li)的場合,如氣動實驗設備、氣動自(zi)動裝置等(deng)。
圖(tu)14—4定(ding)(ding)值器(qi)圖(tu)14—4所示(shi)為定(ding)(ding)值器(qi)的工作原理(li)圖(tu)。它由三(san)部(bu)分(fen)組成:1是直動式減壓閥(fa)的主(zhu)(zhu)閉部(bu)分(fen);2是恒(heng)壓降裝置,相當于(yu)一定(ding)(ding)差(cha)減壓閥(fa)。主(zhu)(zhu)要(yao)作用(yong)是使噴嘴得到穩定(ding)(ding)氣源流量;3是噴嘴擋板(ban)裝置和調(diao)壓部(bu)分(fen),起調(diao)壓和壓力放(fang)大(da)作用(yong),利用(yong)被它放(fang)大(da)了(le)的氣壓去控(kong)制(zhi)主(zhu)(zhu)閥(fa)部(bu)分(fen)。
由于(yu)定值(zhi)器(qi)具有調定、比(bi)較和放大(da)的功(gong)能,因而穩壓精度(du)高(gao)。
定值器處于非工(gong)作(zuo)狀態時,由(you)氣(qi)(qi)(qi)(qi)(qi)源輸入(ru)的(de)壓(ya)縮空(kong)氣(qi)(qi)(qi)(qi)(qi)經過濾(lv)器1過濾(lv)后(hou)進(jin)入(ru)A室(shi)(shi)(shi)和正室(shi)(shi)(shi)。主(zhu)閥(fa)芯19在彈簧20和氣(qi)(qi)(qi)(qi)(qi)源壓(ya)力作(zuo)用下壓(ya)在閥(fa)座上,使A室(shi)(shi)(shi)與B室(shi)(shi)(shi)斷(duan)開。進(jin)入(ru)A室(shi)(shi)(shi)的(de)氣(qi)(qi)(qi)(qi)(qi)流(liu)經由(you)閥(fa)口(又稱為活(huo)門(men))12至F室(shi)(shi)(shi),再通(tong)過恒節(jie)流(liu)孔(kong)13降壓(ya)后(hou),分(fen)(fen)別進(jin)入(ru)G室(shi)(shi)(shi)和D室(shi)(shi)(shi)。由(you)于這時尚未(wei)對膜片(pian)8加力,擋(dang)板5與噴(pen)(pen)嘴(zui)4之(zhi)間的(de)間距較(jiao)大,氣(qi)(qi)(qi)(qi)(qi)體從噴(pen)(pen)嘴(zui)4流(liu)出時的(de)氣(qi)(qi)(qi)(qi)(qi)流(liu)阻力較(jiao)小(xiao)(xiao),G室(shi)(shi)(shi)及(ji)D室(shi)(shi)(shi)的(de)氣(qi)(qi)(qi)(qi)(qi)壓(ya)較(jiao)低,膜片(pian)3及(ji)15保持原(yuan)始位(wei)置。進(jin)入(ru)只(zhi)室(shi)(shi)(shi)的(de)微量(liang)氣(qi)(qi)(qi)(qi)(qi)體主(zhu)要經B室(shi)(shi)(shi)通(tong)過閥(fa)口2從排氣(qi)(qi)(qi)(qi)(qi)口排出;另有一部(bu)分(fen)(fen)從輸出口排空(kong)。此時輸出口無氣(qi)(qi)(qi)(qi)(qi)流(liu)輸出,由(you)噴(pen)(pen)嘴(zui)流(liu)出而(er)排空(kong)微量(liang)氣(qi)(qi)(qi)(qi)(qi)體是維持噴(pen)(pen)嘴(zui)擋(dang)板裝置工(gong)作(zuo)所必(bi)須的(de),因其為無功(gong)耗氣(qi)(qi)(qi)(qi)(qi)量(liang),所以(yi)希望(wang)其耗量(liang)越小(xiao)(xiao)越好(hao)。
定(ding)(ding)值器處于(yu)(yu)工(gong)作狀態時(shi)(shi)(shi),轉動(dong)(dong)手(shou)柄(bing)7,壓(ya)(ya)(ya)(ya)下(xia)彈(dan)簧(huang)6并推(tui)動(dong)(dong)膜(mo)片(pian)(pian)(pian)(pian)8連同(tong)擋(dang)(dang)(dang)板(ban)5一(yi)同(tong)下(xia)移(yi)(yi)、擋(dang)(dang)(dang)板(ban)5與(yu)噴(pen)嘴(zui)4的(de)(de)間(jian)(jian)距(ju)縮小(xiao),氣(qi)流(liu)(liu)阻力(li)(li)(li)增加,使(shi)(shi)G室(shi)(shi)(shi)(shi)(shi)和(he)D室(shi)(shi)(shi)(shi)(shi)的(de)(de)氣(qi)壓(ya)(ya)(ya)(ya)升(sheng)高(gao)。膜(mo)片(pian)(pian)(pian)(pian)16在D室(shi)(shi)(shi)(shi)(shi)氣(qi)壓(ya)(ya)(ya)(ya)的(de)(de)作用下(xia)下(xia)移(yi)(yi),將閥(fa)口2關閉,并向下(xia)推(tui)動(dong)(dong)主閥(fa)芯(xin)19,打(da)開(kai)閥(fa)口,壓(ya)(ya)(ya)(ya)縮空(kong)氣(qi)經(jing)B室(shi)(shi)(shi)(shi)(shi)和(he)H室(shi)(shi)(shi)(shi)(shi)由輸(shu)(shu)出(chu)(chu)(chu)(chu)口輸(shu)(shu)出(chu)(chu)(chu)(chu)。與(yu)此同(tong)時(shi)(shi)(shi),H室(shi)(shi)(shi)(shi)(shi)壓(ya)(ya)(ya)(ya)力(li)(li)(li)上(shang)升(sheng)并反饋(kui)到(dao)(dao)膜(mo)片(pian)(pian)(pian)(pian)8上(shang),當(dang)膜(mo)片(pian)(pian)(pian)(pian)8所受(shou)反饋(kui)作用力(li)(li)(li)與(yu)彈(dan)簧(huang)力(li)(li)(li)平(ping)(ping)衡(heng)(heng)時(shi)(shi)(shi),定(ding)(ding)值器便輸(shu)(shu)出(chu)(chu)(chu)(chu)一(yi)定(ding)(ding)壓(ya)(ya)(ya)(ya)力(li)(li)(li)的(de)(de)氣(qi)體。 當(dang)輸(shu)(shu)入壓(ya)(ya)(ya)(ya)力(li)(li)(li)波動(dong)(dong)時(shi)(shi)(shi),如壓(ya)(ya)(ya)(ya)力(li)(li)(li)上(shang)升(sheng),B室(shi)(shi)(shi)(shi)(shi)和(he)H室(shi)(shi)(shi)(shi)(shi)氣(qi)壓(ya)(ya)(ya)(ya)瞬時(shi)(shi)(shi)增高(gao)、使(shi)(shi)膜(mo)片(pian)(pian)(pian)(pian)8上(shang)移(yi)(yi),導致擋(dang)(dang)(dang)板(ban)5與(yu)噴(pen)嘴(zui)4之間(jian)(jian)的(de)(de)間(jian)(jian)距(ju)加大(da),G室(shi)(shi)(shi)(shi)(shi)和(he)D室(shi)(shi)(shi)(shi)(shi)的(de)(de)氣(qi)壓(ya)(ya)(ya)(ya)下(xia)降。由于(yu)(yu)B室(shi)(shi)(shi)(shi)(shi)壓(ya)(ya)(ya)(ya)力(li)(li)(li)增高(gao),D室(shi)(shi)(shi)(shi)(shi)壓(ya)(ya)(ya)(ya)力(li)(li)(li)下(xia)降,膜(mo)片(pian)(pian)(pian)(pian)15在壓(ya)(ya)(ya)(ya)差的(de)(de)作用下(xia)向上(shang)移(yi)(yi)動(dong)(dong),使(shi)(shi)主閥(fa)口減小(xiao),輸(shu)(shu)出(chu)(chu)(chu)(chu)壓(ya)(ya)(ya)(ya)力(li)(li)(li)下(xia)降,直到(dao)(dao)穩定(ding)(ding)到(dao)(dao)調(diao)(diao)定(ding)(ding)壓(ya)(ya)(ya)(ya)力(li)(li)(li)上(shang)。此外,在輸(shu)(shu)入壓(ya)(ya)(ya)(ya)力(li)(li)(li)上(shang)升(sheng)時(shi)(shi)(shi),E室(shi)(shi)(shi)(shi)(shi)壓(ya)(ya)(ya)(ya)力(li)(li)(li)和(he)F室(shi)(shi)(shi)(shi)(shi)瞬時(shi)(shi)(shi)壓(ya)(ya)(ya)(ya)力(li)(li)(li)也上(shang)升(sheng),膜(mo)片(pian)(pian)(pian)(pian)3在上(shang)下(xia)差壓(ya)(ya)(ya)(ya)的(de)(de)作用下(xia)上(shang)移(yi)(yi),關小(xiao)穩壓(ya)(ya)(ya)(ya)閥(fa)口12。由于(yu)(yu)節流(liu)(liu)作用加強(qiang),F室(shi)(shi)(shi)(shi)(shi)氣(qi)壓(ya)(ya)(ya)(ya)下(xia)降,始(shi)終(zhong)保持節流(liu)(liu)孔13的(de)(de)前(qian)后(hou)壓(ya)(ya)(ya)(ya)差恒(heng)定(ding)(ding),故通過(guo)節流(liu)(liu)孔13的(de)(de)氣(qi)體流(liu)(liu)量不變,使(shi)(shi)噴(pen)嘴(zui)擋(dang)(dang)(dang)板(ban)的(de)(de)靈(ling)敏度得到(dao)(dao)提高(gao)。當(dang)輸(shu)(shu)入壓(ya)(ya)(ya)(ya)力(li)(li)(li)降低時(shi)(shi)(shi),B室(shi)(shi)(shi)(shi)(shi)和(he)H室(shi)(shi)(shi)(shi)(shi)的(de)(de)壓(ya)(ya)(ya)(ya)力(li)(li)(li)瞬時(shi)(shi)(shi)下(xia)降,膜(mo)片(pian)(pian)(pian)(pian)8連同(tong)擋(dang)(dang)(dang)板(ban)5由于(yu)(yu)受(shou)力(li)(li)(li)平(ping)(ping)衡(heng)(heng)破壞而(er)下(xia)移(yi)(yi),噴(pen)嘴(zui)4與(yu)擋(dang)(dang)(dang)板(ban)5間(jian)(jian)間(jian)(jian)距(ju)減小(xiao),G室(shi)(shi)(shi)(shi)(shi)和(he)D室(shi)(shi)(shi)(shi)(shi)壓(ya)(ya)(ya)(ya)力(li)(li)(li)上(shang)升(sheng),膜(mo)片(pian)(pian)(pian)(pian)3和(he)15下(xia)移(yi)(yi)。膜(mo)片(pian)(pian)(pian)(pian)15下(xia)移(yi)(yi)使(shi)(shi)主閥(fa)口開(kai)度加大(da),使(shi)(shi)B室(shi)(shi)(shi)(shi)(shi)及(ji)H室(shi)(shi)(shi)(shi)(shi)氣(qi)壓(ya)(ya)(ya)(ya)回升(sheng),直到(dao)(dao)與(yu)調(diao)(diao)定(ding)(ding)壓(ya)(ya)(ya)(ya)力(li)(li)(li)平(ping)(ping)衡(heng)(heng)為(wei)止。而(er)膜(mo)片(pian)(pian)(pian)(pian)3下(xia)移(yi)(yi),使(shi)(shi)穩壓(ya)(ya)(ya)(ya)口12開(kai)大(da),F室(shi)(shi)(shi)(shi)(shi)氣(qi)壓(ya)(ya)(ya)(ya)上(shang)升(sheng),始(shi)終(zhong)保持恒(heng)節流(liu)(liu)孔13前(qian)后(hou)壓(ya)(ya)(ya)(ya)差恒(heng)定(ding)(ding)。同(tong)理,當(dang)輸(shu)(shu)出(chu)(chu)(chu)(chu)壓(ya)(ya)(ya)(ya)力(li)(li)(li)波動(dong)(dong)時(shi)(shi)(shi),將與(yu)輸(shu)(shu)入壓(ya)(ya)(ya)(ya)力(li)(li)(li)波動(dong)(dong)時(shi)(shi)(shi)得到(dao)(dao)同(tong)樣的(de)(de)調(diao)(diao)節。
由于(yu)定值器利用輸出壓(ya)(ya)力(li)的反饋作(zuo)用和噴嘴擋板的放大作(zuo)用控(kong)制主閥,使其能對較小的壓(ya)(ya)力(li)變(bian)化作(zuo)出反應,從而使輸出壓(ya)(ya)力(li)得到及時調(diao)節,保(bao)持出口(kou)壓(ya)(ya)力(li)基本穩定,即(ji)定值穩壓(ya)(ya)精(jing)度較高。