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電站旋啟式止回閥 簡介

止回閥是能自動(dòng)阻止流體倒流的閥門。止回閥的閥瓣在流體壓力作用下開啟，流體從進(jìn)口側(cè)流向出口側(cè)。當(dāng)進(jìn)口側(cè)壓力低于出口側(cè)時(shí)，閥瓣在流體壓差、本身重力等因素作用下自動(dòng)關(guān)閉以防止流體倒流。
止回閥一般分為升降式、旋啟式等幾種類型。
電站旋啟式止回閥主要零件材料及性能規(guī)范

主要零部件	閥體、閥蓋、搖桿	WCB	CF8	CF8M	WC6、WC9
	閥瓣	WCB堆Cr13或硬質(zhì)合金	CF8堆硬質(zhì)合金	CF8M堆硬質(zhì)合金	WC6、WC9堆硬質(zhì)合金
	閥座	25堆Cr13或硬質(zhì)合金	304堆硬質(zhì)合金	316堆硬質(zhì)合金	20Cr1MoV堆硬質(zhì)合金
	墊片	軟鐵、XB450	聚四氟乙烯	聚四氟乙烯	不銹鋼耐酸石棉纏繞墊
	螺栓	35CrMoA	35CrMoA	35CrMoA	25Cr1Mo1V
	螺母	45	45	45	35CrMoA
主要參數(shù)	適用介質(zhì)	油品、水、蒸汽	硝酸類	醋酸類	油品、水、蒸汽
主要參數(shù)	適用溫度 ℃	≤425	≤200	≤200	≤550

電站旋啟式止回閥外形尺寸

型號(hào)	公稱通徑 NPS（in）	壓力級(jí) Class	主要結(jié)構(gòu)尺寸（mm）					閥體材料	性能規(guī)范
型號(hào)	公稱通徑 NPS（in）	壓力級(jí) Class	D	D₁	L	L₁	H	閥體材料	適用溫度（℃）	適用介質(zhì)
SFH-64C150C	2"	150			203		170	WCB	≤425	水、油品、蒸氣等
"	3"	"			241		185	"	"	"
"	4"	"			292		215	"	"	"
"	6"	"			356		260	"	"	"
"	8"	"			495		300	"	"	"
"	10"	"			622		350	"	"	"
"	12"	"			699		400	"	"	"
"	14"	"			787		450	"	"	"
"	16"	"			864		480	"	"	"
"	18"	"			978		540	"	"	"
"	20"	"			978		600	"	"	"
"	24"	"			1295		680	"	"	"
SFH-64C300C	2"	300			267		170	WCB	≤425	水、油品、蒸氣等
"	3"	"			318		215	"	"	"
"	4"	"			356		235	"	"	"
"	6"	"			445		300	"	"	"
"	8"	"			533		340	"	"	"
"	10"	"			622		350	"	"	"
"	12"	"			711		420	"	"	"
"	14"	"			838		480	"	"	"
"	16"	"			864		520	"	"	"
"	18"	"			978		600	"	"	"
"	20"	"			1016		670	"	"	"
"	24"	"			1346		750	"	"	"
SFH-64C600C	2"	600			292		175	WCB	≤425	水、油品、蒸氣
"	3"	"			356		230	"	"	"
"	4"	"			432		295	"	"	"
"	6"	"			559		360	"	"	"
"	8"	"			660		400	"	"	"
"	10"	"			787		460	"	"	"
"	12"	"			838		520	"	"	"
"	14"	"			889		560	"	"	"
"	16"	"			991		650	"	"	"
"	18"	"			1092		730	"	"	"
"	20"	"			1194		800	"	"	"
"	24"	"			1397		900	"	"	"