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ZMAP-16P低溫氣動(dòng)薄膜單座調(diào)節(jié)閥

氣動(dòng)薄膜低溫調(diào)節(jié)閥概述：氣動(dòng)薄膜低溫調(diào)節(jié)閥是單、雙座調(diào)節(jié)閥的變形產(chǎn)品。它與常溫調(diào)節(jié)閥不同之處在于采用長頸型上閥蓋，使填料處于常溫下工作。適用于-60～-250℃低溫壯態(tài)下

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氣動(dòng)薄膜低溫調(diào)節(jié)閥概述：

氣動(dòng)薄膜低溫調(diào)節(jié)閥是單、雙座調(diào)節(jié)閥的變形產(chǎn)品。它與常溫調(diào)節(jié)閥不同之處在于采用長頸型上閥蓋，使填料處于常溫下工作。適用于-60～-250℃低溫壯態(tài)下的介質(zhì)（如液氧、液氮等）的調(diào)節(jié)。為調(diào)節(jié)精度，一般都配用閥門定位器。

結(jié)構(gòu)原理：

氣動(dòng)低溫調(diào)節(jié)閥由氣動(dòng)薄膜執(zhí)行機(jī)構(gòu)和耐低溫的單、雙座閥兩部分組成。由調(diào)節(jié)器來的信號壓力輸入氣動(dòng)薄膜執(zhí)行機(jī)構(gòu)的氣室，產(chǎn)生推力，通過連接桿件帶動(dòng)閥芯，閥芯位置的變化使閥的流通截面積變化，實(shí)現(xiàn)對介質(zhì)流量的調(diào)節(jié)。

調(diào)節(jié)閥的閥體類型選擇：
調(diào)節(jié)閥的閥體種類很多，常用的閥體種類有:①直通單座 ②直通雙座 ③角形 ④隔膜 ⑤小流量 ⑥三通 ⑦偏心旋轉(zhuǎn) ⑧蝶形 ⑨套筒式 ⑩球形等。

調(diào)節(jié)閥在具體選擇時(shí)，可做如下考慮:
(1) 閥芯形狀結(jié)構(gòu)：主要根據(jù)所選擇的流量特性和不平衡力等因素考慮。
(2) 耐磨損性：當(dāng)流體介質(zhì)是含有高濃度磨損性顆粒的懸浮液時(shí)，閥的內(nèi)部材料要堅(jiān)硬。
(3) 耐腐蝕性：由于介質(zhì)具有腐蝕性，盡量選擇結(jié)構(gòu)簡單閥門。
(4) 介質(zhì)的溫度、壓力：當(dāng)介質(zhì)的溫度、壓力高且變化大時(shí)，應(yīng)選用閥芯和閥座的材料受溫度、壓力變化小的閥門，當(dāng)溫度≥250℃時(shí)應(yīng)加散熱器。
(5) 防止閃蒸和空化：閃蒸和空化只產(chǎn)生在液體介質(zhì)。在實(shí)際生產(chǎn)過程中，閃蒸和空化會形成振動(dòng)和噪聲，縮短閥門的使用壽命，因此在選擇閥門時(shí)應(yīng)防止閥門產(chǎn)生閃蒸和空化。

主要技術(shù)指標(biāo)：

公稱通徑 DN	單座	20										25	32	40	50	65	80	100	125	150	200
	雙座											25	32	40	50	65	80	100	125	150	200
額定流量系數(shù)Kv	單座	0.08	0.12	0.20	0.32	0.50	0.80	1.2	2.0	3.2	5.0	8	12	20	32	50	80	120	200	280	450
	雙座											10	6	25	40	63	100	160	250	400	630
流量特性		直線						直線；等百分比
配用執(zhí)行機(jī)構(gòu)型號												ZMA-2		ZMA-3		ZMA-4			ZMA-5
行程		10						10				16		25		40			60
作用方式		氣關(guān)式（B），氣開式（K）
彈簧壓力范圍KPa		標(biāo)準(zhǔn)信號：20～100；其它信號；40～200；20～60；60～100

主要連接尺寸：

公稱通徑DN（mm）				20	25	32	40	50	65	80	100	125	150	200
A			230	280	280		325		410			495
			135	235	235	255	280	310	345	370	430	470	550	660
1			160	260	260	285	305	340	375	405	460	525	590	700
2			190	290	290	315	335	370	410	440	490	560	630	740
n-			6-12	8-14	8-14	8-14	8-16		10-16	10-18	12-18	16-18		20-18
單座	H	L	120	190	200	210	235	265	295	210	370	440	475	570
		H1=500	862	1006	1060	1066	1137	1152	1377	1390	1394
		H1=600	962	1106	1160	1166	1237	1252	1477	1490	1494
		H1=700	1062	1206	1260	1266	1337	1352	1577	1590	1594	1743	1751	1790
		H1=800	1162	1306	1360	1366	1437	1452	1677	1690	1694	1843	1851	1890
		H1=900	1262	1406	1460	1466	1537	1552	1777	1790	1794	1943	1951	1990
		H1=1000	1362	1506	1560	1566	1637	1652	1877	1890	1894	2043	2051	2090
		H1=1100										2143	2150	2190
		H1=1200										2243	2250	2290
	H2		32	58	112	118	129	144	178	191	195	243	251	290
雙座	H	L			200	210	235	265	295	320	370	440	475	570
		H1=500			1065	1068	1147	1152	1387	1407	1419
		H1=600			1165	1168	1247	1252	1487	1507	1519
		H1=700			1265	1268	1347	1352	1587	1607	1619	1768	1778	1820
		H1=800			1365	1368	1447	1452	1687	1607	1719	1868	1878	1920
		H1=900			1465	1468	1547	1552	1787	1807	1819	1968	1978	2020
		H1=1000			1565	1568	1647	1652	1887	1907	1919	2068	2078	2120
		H1=1100										2168	2178	2220
		H1=1200										2268	2278	2320
	H2				117	120	139	144	188	208	208	268	278	320

調(diào)節(jié)閥由電動(dòng)執(zhí)行機(jī)構(gòu)或氣動(dòng)執(zhí)行機(jī)構(gòu)和調(diào)節(jié)閥兩部分組成。調(diào)節(jié)閥分電動(dòng)調(diào)節(jié)閥、氣動(dòng)調(diào)節(jié)閥和液動(dòng)調(diào)節(jié)閥（自力式調(diào)節(jié)閥）等。調(diào)節(jié)閥用于調(diào)節(jié)介質(zhì)的流量、壓力和液位。根據(jù)調(diào)節(jié)部位信號，自動(dòng)控制閥門的開度，從而達(dá)到介質(zhì)流量、壓力和液位的調(diào)節(jié)。
調(diào)節(jié)閥通常分為直通單座式調(diào)節(jié)閥和直通雙座式調(diào)節(jié)閥兩種，后者具有流通能力大、不平衡辦小和操作穩(wěn)定的特點(diǎn)，所以通常適用于大流量、高壓降和泄漏少的場合。流通能力Cv是選擇調(diào)節(jié)閥的主要參數(shù)之一，調(diào)節(jié)閥的流通能力的定義為：當(dāng)調(diào)節(jié)閥全開時(shí)，閥兩端壓差為0.1MPa，流體密度為1g/cm3時(shí)，每小時(shí)流徑調(diào)節(jié)閥的流量數(shù)，稱為流通能力，也稱流量系數(shù)，以Cv表示，單位為t/h，液體的Cv值按下式計(jì)算。

氣動(dòng)薄膜低溫調(diào)節(jié)閥安裝、使用注意事項(xiàng)：

（1）應(yīng)垂直安裝于水平管道上，在情況下需要水平或傾斜安裝時(shí)，一般應(yīng)加支撐。裝于保溫箱壁的園板與保溫箱壁應(yīng)平行。

（2）應(yīng)安裝在靠近地面或樓板的地方，以便在于維護(hù)檢修，對裝有閥門定位器或手輪機(jī)構(gòu)者，更應(yīng)觀察，調(diào)整和操作和方便。

（3）一般都設(shè)置旁通管路，以便在自控系統(tǒng)發(fā)生故障或維修調(diào)節(jié)閥時(shí)切換到手動(dòng)操作，不致于停止生產(chǎn)。

（4）裝有手輪機(jī)構(gòu)時(shí)，也可省略旁通管路時(shí)行手動(dòng)操作，還可用于限制閥門的開度。當(dāng)停止使用時(shí)，手輪機(jī)構(gòu)恢復(fù)到原來空檔位置，以利自控系統(tǒng)正常進(jìn)行。

（5）安裝時(shí)，應(yīng)使介質(zhì)流向與閥體指示方向一致。

（6）調(diào)節(jié)閥在安裝前應(yīng)對管路清洗污物、焊渣。安裝后，使調(diào)節(jié)閥全開，對管路，閥門等進(jìn)行清洗及試驗(yàn)各連接處的密封性。

咨詢：ZMAP-16P低溫氣動(dòng)薄膜單座調(diào)節(jié)閥

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